star trek station size comparison chart

Reference Tables

Updated September 8, 2023

When I first started making my starship comparison charts, I gave little thought to documenting my references. I just wanted to see the ships side-by-side! But over the years, the Star Trek Minutiae reference charts have been shared widely on social media and have even been referenced (sometimes erroneously) by official sources. To help provide the most accurate information possible, these tables provide sources for the size of the ship and credit for the artist (where known) who created the image that is used in the chart. If any ship image is used with missing or incorrect credit, please let me know !

Star Trek (all series)

Entries marked [NC] denote non-canon ships.

2001: A Space Odyssey

Battlestar galactica (1978), battlestar galactica (2003), close encounters of the third kind, dune (2000), the expanse, for all mankind, forbidden planet, galaxy quest, independence day, interstellar, the last starfighter, marvel cinematic universe, the orville, silent running, space battleship yamato ( star blazers ), space: 1999, space: above and beyond, starship troopers, war of the worlds (1953).

Sci-Fi Starship Size Comparison Chart

Starship Size Comparison Chart, Large Compiled by Dan Carlson; Updated June 7, 2007 http://www.st-minutiae.com/ Star Wars Confederacy of Independent Systems Confederacy of Independent Systems Confederacy of Independent Systems Munificent Class Star Wars Star Wars Star Wars Galactic Republic Acclamator Class 752 meters 1 pixel = 10 meters Recusant Class 1187 meters Providence Class Star Wars Trade Federation Battleship 3170 meters 825 meters 1088 meters Star Wars Trade Federation Landing Transport 370 meters (width) Star Galactic Empire Executor Class 19,000 meters (approx.) Star Wars Galactic Republic Venator Class 1137 meters Wars Star Wars Rebel Alliance Liberty Class 1554 meters Star Wars Rebel Alliance Mon Calamari Star Cruiser 2200 meters (approximate) Galactic Republic Dreadnought Class 600 meters Star Wars Galactic Empire Imperial Class 1606 meters Star Wars Rebel Alliance Corellian Corvette 151 meters Babylon 5 The Shadows Scout Vessel (typical) 350 meters (average) Star Wars Rebel Alliance Nebulon-B Escort Frigate 300 meters Star Wars Rebel Alliance Babylon 5 The Shadows Attack Vessel (typical) 1500 meters (average) Star Wars Transport 244 meters Star Wars Rebel Alliance Home One 3810 meters Galactic Empire Victory Class 900 meters Babylon 5 Earth Alliance Babylon 5 8454 meters Babylon 5 Vorlon Empire Heavy Cruiser 1330 meters Babylon 5 Vorlon Empire Transport 131 meters Star Wars Rebel Alliance Mon Calamari Star Cruiser 1609 meters Star Wars Rebel Alliance Mon Calamari Star Cruiser 2300 meters (approximate) Star Wars Nkklon Mining Corporation Solar Shield Ship 500 meters (approximate) Babylon 5 Earth Alliance Olympus Class 444 meters Babylon 5 Earth Alliance Omega Class 1714 meters Crusade Earth Alliance Shadow Hybrid 1000 meters (approximate) Babylon 5 Earth Alliance Battlestar Galactica (2003) Twelve Colonies of Kobol BS Galactica 1414 meters Battlestar Galactica (2003) Twelve Colonies of Kobol BS Pegasus 1600 meters (approximate) Battlestar Galactica (1978) Twelve Colonies of Kobol Columbia Class 1265 meters Warlock Class 1992 meters Babylon 5 Drakh Hordes Babylon 5 Earth Alliance Hyperion Class 1025 meters Babylon 5 Drakh Hordes Raider 215 meters Heavy Cruiser 3316 meters Babylon 5 Earth Alliance Babylon 5 Earth Alliance Earth Force One 425 meters Nova Class 1502 meters Battlestar Galactica (2003) Cylon Basestar 1555 meters Babylon 5 Babylon 5 Centauri Republic Centauri Republic Centauri Republic Vorchan Class 608 meters Babylon 5 Battlestar Galactica (2003) Twelve Colonies of Kobol Luxury Liner 1200 meters (approximate) Battlestar Galactica (1978) Cylon Empire Basestar 1768 meters (approximate) Corvan Class 304 meters Primus Class 1586 meters Battlestar Galactica (2003) Twelve Colonies of Kobol Mineral Ship 780 meters (approximate) Babylon 5 Earth Alliance Station Babylon 4 7724 meters Babylon 5 Minbari Federation Tinashi Class Gene Roddenberry's Andromeda Systems Commonwealth Glorious Heritage Class 1301 meters 869 meters Babylon 5 Regime T'Loth Class 1050 meters Babylon 5 Minbari Federation Babylon 5 Nam Con Regime G'Quon Class 1407 meters Sharlin Class Space: Above and Beyond United States of America John F. Kennedy Class 1660 meters Legend of the Rangers Interstellar Alliance 526 meters Legend of the Rangers Interstellar Alliance Valenn Class Liandra Class 162 meters 1300 meters (approx) Space: Above and Beyond Chig Battleship Babylon ! Interstellar Alliance Whitestar Class Farscape Scarran Hierarchy Decimator 3000 meters (approximate) Crusade Interstellar Alliance 470 meters Babylon 5 Brakiri Babylon 5 Vree Xill Class 504 meters Victory Class 2990 meters Babylon 5 Drazi Sunhawk Class 350 meters 476 meters Starship Troopers Terran Federation Ares Class 550 meters Farscape Moya (Leviathan) 1500 meters (approximate) Avioki Class 1024 meters Babylon 5 Nam Regime Quadrant 37 Military Outpost 3185 meters Farscape Peacekeeper Command Pantak Class (aka Vigilante) Talyn (Leviathan Gunship) 550 meters (approximate) Farscape Babylon 5 th Alliance Galaxy Quest NSEA Protector 488 meters 500 meters (approximate) Stargate SG-1 Ori Ascendancy Mothership 2000 meters (approximate) Explorer Class 6104 meters Starga Stargate Atlantis Ancients (Alterans) Aurora Class 1600 meters (approximate) SG-1 I States Air Force USAF Prometheus (X-303) 250 meters (approximate) Star Trek United Federation of Planets Constitution Class (refit) 289 meters (305 meters) Star Trek Romulan Star Empire D'deridex Class 1341 meters Stargate SG-1 Goa'uld System Lords Hatak Class 1000 meters (approximate) Stargate Atlantis United States Air Force Star Trek lan Star Empire Daedalus Class Star Trek United Federation of Planets Galaxy Class 642 meters 850 meters (approximate) 350 meters (approximate) Star Trek Romulan Star Empire Valdore Class 604 meters 2001: A Space Odyssey United States of America Space Station 5 1200 meters (estimate) Star Trek The Doomsday Machine 2700 meters (approximate) t.. -E..-... Star Trek Krenim Imperium Temporal Incursion Ship 1550 meters (approximate) Star Trek Star Trek The Dominion Dreadnought 1500 meters (approximate) Borg Collective Command Ship 820 meters (approximate) Star Trek United Federation of Planets Deep Space 9 1452 meters Star Trek Borg Collective Tactical Sphere 1200 meters (diameter, approximate) Star Trek United Federation of Planets Earth Spacedock 3810 meters (diameter) Star Trek Kazon Collective Predator Class meters (approximate) Star Trek Star Trek United Federation of Planets Borg Collective Scout Sphere 600 meters (diameter, approximate) Star Trek United Federation of Planets Starbase 375 2842 meters Jupiter Station 783 meters Star Trek Star Trek Star Trek Star Trek Borg Collective ining Base 1800 meters (approximate) Tactical Cube 1500 meters (approximate) Borg Collective Probe 400 m Borg Collective Assimilation Cube 3040 meters (approximate) 0 meters (approximate) Star Trek United Federation of Planets Utopia Planitia Orbital Habitat 1200 meters (height, approximate) மறாற் Star Trek United Federation of Planets Argus Array 2400 meters Star Trek Klingon Empire Ty'go'kor Orbital Defense Station 1532 meters (diameter) Star Trek United Federation of Planets Remmler Array 1100 meters (estimate) Star Trek First Federation Fesarius 1600 meters (diameter, approximate) Star Trek Voth City Ship 9800 meters (approximate) Star Trek Son'a Solidarity Collector Ship 1254 meters Star Trek Nacene Star Trek Lysian Central Command Caretaker's Array 4500 meters (diameter, approximate) 3400 meters

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The Size of Deep Space Nine

• The premise for all my deck calculations: a deck is 2,5m + 0,5m for EPS cables, power cables, ... = 3m height for a deck. Deep Space 9 has 4m (3m deck high + 1m access tunnel - The Federation equivalent of the access tunnel was the Jefferies tube.)

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Starstation Aurora Size Comparison Charts

Discussion in ' Trek Tech ' started by Stibbons , Jan 15, 2019 .

Andrew Meknitsch Cadet Newbie

Bernard Guignard said: ↑ If I remember correctly the Version that you have could be ordered from Starstation Aurora from an ad in Starlog around copyright date. It predates the special edition. The catalog that I put up was a also printed much later. Click to expand...

trynda1701 said: ↑ I'm surprised Franz Joseph wasn't credited in that list. Thanks for sharing these. I hadn't seen the Cahuya and Apache classes before. Plus, I knew that the Decatur was an amalgam of TOS/TOP tech, but I hadn't seen that prototype Ascension class Dreadnought with the same mix of the two techs. Click to expand...

Christopher Writer Admiral

Andrew Meknitsch said: ↑ What’s “TOP”? Click to expand...

trynda1701 Commodore Commodore

Christopher said: ↑ Typo for TMP? Click to expand...

publiusr Admiral Admiral

Apache was my fav—Caracal looked to get a semi-refit with TOS nacelle treatments  

Stibbons Lieutenant Commander Red Shirt

Just picked up a combo of one of the earliest size comparison charts, Michael McMasters 1978 Size Comparison Chart, together with Aridas Sofia's Federation Starship Recognition Chart. Both are rolled, I had a folded version of the former but this is a better condition copy. The latter of course has a companion in the U.S.S. Enterprise Heavy Cruiser Evolution Blueprints by David Nielsen which is so oddly similar in style one might almost think they were by the same person (alas I do not have the original envelope of that last one, just the three sheets). Both the latter have the huge Ariel-Class ship which is so similar to the Discovery I can't believe it's not in the ancestry somewhere.  

Timo Fleet Admiral Admiral

Yup, "ancestry" is certainly something we can read into these charts in hindsight. One of the Ariadne's parents probably was Vulcan, say... (Yet another opportunity for me to mount my trusted hobby-horse and state that NCC-1031 used to be a carrier, with vast interior volume, until in the 2250s found surplus to requirement and turned into a flying laboratory where oddly shaped experiments occupy some corners of the former hangars, but others remain empty save for impromptu scaffolding and turborails.) Timo Saloniemi  

Mysterion Vice Admiral Admiral

Stibbons said: ↑ Just picked up a combo of one of the earliest size comparison charts, Michael McMasters 1978 Size Comparison Chart, together with Aridas Sofia 's Federation Starship Recognition Chart. Both are rolled, I had a folded version of the former but this is a better condition copy. The latter of course has a companion in the U.S.S. Enterprise Heavy Cruiser Evolution Blueprints by David Nielsen which is so oddly similar in style one might almost think they were by the same person (alas I do not have the original envelope of that last one, just the three sheets). Click to expand...

I did actually realise that a year or so ago on a Surya-class thread I created. I actually theorise that they are some form of dual intelligence sharing the same body...  

Tallguy Rear Admiral Rear Admiral

Stibbons said: ↑ I did actually realise that a year or so ago on a Surya-class thread I created. I actually theorise that they are some form of dual intelligence sharing the same body... Click to expand...

Tallguy said: ↑ I have both of the comparison charts. I had the Decatur chart, but it got lost in a move. I never had the Avenger or Dreadnought sheets. These were all such great products. Click to expand...

Bernard Guignard Fleet Captain Fleet Captain

As do I  

aridas sofia Rear Admiral Rear Admiral

Just to clarify, Todd Guenther DID design Pompey . It was his two-nacelle refit of Saladin and Hermes .  

Here I thought the two nacelles were attached directly to the saucer. I know now they had a tiny engineering hull  

kwong0951 Cadet Newbie

Stibbons said: ↑ Now you should be able see these, trying Pinterest first, if that doesn't work I'll try another free hosting site. https://i.pinimg.com/originals/18/09/25/1809252a25e400202692c65429023d67.jpg https://i.pinimg.com/originals/a4/8c/9d/a48c9d192082ce5bceba1ee9ba2dec48.jpg https://i.pinimg.com/originals/a4/8c/9d/a48c9d192082ce5bceba1ee9ba2dec48.jpg https://i.pinimg.com/originals/20/32/ab/2032ab91f8c943b31e1b24ac137fa3b9.jpg https://i.pinimg.com/originals/ad/40/84/ad40844c522a0364732bc19f466f4db9.jpg https://i.pinimg.com/originals/ad/40/84/ad40844c522a0364732bc19f466f4db9.jpg Click to expand...

DEWLine Rear Admiral Rear Admiral

Stibbons said: ↑ Damn, just realised that non-members can't see the blasted content. You can sign up if you want (Far Trek is a damned good TOS Era RPG) or I'll try and get them on Pinterest and repost them here. Give me a mo... Click to expand...

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The Bird-of-Prey Size Paradox

The Klingon Bird-of-Prey ship type was designed by Nilo Rodis of ILM and was first featured in "Star Trek III: The Search for Spock" as the ship of the Klingon villain Kruge. In an early draft of the script, Kruge was intended to steal the ship from the Romulans, which would explain its name and appearance (inspired by the Romulan Bird-of-Prey from TOS: "Balance of Terror") as well as the fact that the ship is equipped with a cloaking device. The Romulan reference was dropped in the final version, probably to simplify the story. The plausible explanation for the Romulan-Klingon technology transfer (Klingon D7 battlecruisers for the Romulans and in exchange Romulan cloaking devices for the Klingons) is that they formed an alliance in the 2260's, although it was never mentioned in any episode or movie. In spite of the "worn out" look of the Bird-of-Prey studio model it is advantageous to assume the ship type was new as of the 2280's to explain the fact it is still not obsolete 90 years later during TNG and DS9. Since ENT: "The Expanse" we know for sure that the familiar BoP is actually neither a Romulan design nor a design inspired by Romulans, but a 23rd century version of a similar, yet much older genuine Klingon ship of the 22nd century.

Nilo Rodis originally devised the studio model with a length of 360ft (roughly 110m) as illustrated on the ILM size comparison chart for "Star Trek III". Unlike it is the case with most Federation starships, there are few details on the miniature that would allow to verify this figure. Most notably, there are pairs of rectangular openings in the front section of the ship that might be windows and that would give us three decks in this section. If this is true, 110m could be just right.

Screen Evidence

The Klingon Bird-of-Prey is the most obvious example in Star Trek for excessive scaling of a starship , sometimes accidental, sometimes intentional. Various designations have been used throughout the years, creating the impression that "Bird-of-Prey" is merely a generic term for the ship's appearance, whereas the actual types or classes are called B'rel, K'Vort or D-12. Many fans take this as a sign that the different types should differ in their sizes too. The following paragraphs summarize the appearances of Birds-of-Prey, their VFX dimensions, names, crew sizes and other details pointing to the ship's length(s). The list is extensive, yet far from being complete. It will be supplemented as new evidence becomes available.

Star Trek III

When the ship appears for the very first time in "Star Trek III: The Search for Spock", the VFX comparison with the Merchantman is a moot case. The freighter was rendered much too small apparently just for the dramatic impact of the mighty Bird-of-Prey destroying it. It would require a huge BoP for the Merchantman to be more than just shuttle-sized, but this would be in strong contradiction to most of the later appearances of the very same BoP (which will become the "HMS Bounty" in "Star Trek IV").

The Klingon ship is identified as "Bird-of-Prey class" by Sulu and has a crew complement of twelve. The comparison of the BoP and the Enterprise in "Star Trek III" corroborates the intended 110m for the most part, although it would basically permit a small 60m BoP just as well.

After the ship has landed on Vulcan at the end of the movie, there is a scene with the crew using the aft exit hatch, pointing to an overall length of roughly 100m.

Star Trek IV

In "Star Trek IV: The Voyage Home", a very similar scene as at the end of the previous movie shows a number of people standing on the hatch of the "HMS Bounty", but this time they appear to be much taller, making the ship only 50m long. On the other hand, the same "HMS Bounty" is said to have a 60ft (~20m) cargo bay, big enough to hold two 45-50ft (>15m) humpback whales. Fitting this cargo bay into a 50m ship is virtually impossible, since the rearward section is just not long enough - especially considering that the aft end is indented and the impulse engines need some room too, at least five meters, rather more. So 60m is the absolute minimum length for the ship, but then the whole engineering section would be nothing but a cargo bay. In this case the question would be what the Klingons need with such a single spacious room on a warship, with all other sections being incredibly crammed?

One scene of "Star Trek IV" paradoxically does the exact contrary of keeping the BoP small. The Klingon ship is huge beyond reason when we see it hover straight above the whaling ship, arguably for the "dramatic impact". If the BoP were only 60m wide (at 50m length), the boat would measure hardly 7m! The boat must be at least 40m owing to its structure (the actual boat, a former mine sweeper named Golden Gate, measures 42.6m), so the BoP is exceedingly scaled up here. Just for fun, we would obtain a width of no less than 330m.

Another good size reference in the movie is the scene in which the BoP sinks in San Francisco Bay and only the bridge is sticking out. The comparison with the people standing on the cloaking device bulge leaves us with a BoP of well below 50m! It should be annotated that in the case of the aft hatch as well as of the bridge full-scale mock-ups were involved that had to be built large enough to be recognizable but small enough for technical and financial considerations. Still, it is noteworthy that, with the one notable exception above, the movie generally attempts to render the BoP as small as possible.

Side note On a side note, not only was the size of the very same ship subject to change considerably from "Star Trek III" to "Star Trek IV". Also the bridge was completely rebuilt. Kruge's "throne" was removed, all stations re-arranged, and even the floor and the walls were moved. This alone would be no problem, if we consider that Klingons, like the Federation, could use bridge modules. But the ship was serviced on Vulcan. Even if we believe that the refit was necessary because of battle damage, we can't assume that the Vulcan engineers or Scotty would have the expertise to do that or would even have another Klingon bridge readily available. As Scotty himself said, "Reading Klingon is hard" , suggesting that there are already problems to decipher the manuals for the ship in its current configuration. If we nonetheless insist on them rebuilding the bridge, why are all controls in "Star Trek IV" still in Klingon? The only way for it to make any sense is that the bridge in "Star Trek IV" is actually an auxiliary control room. We wouldn't expect something like that on a 50m or 60m ship, which takes us back to the size paradox.

Star Trek V

The movie has a couple of nice close-ups of the Bird-of-Prey. As already mentioned, it is possible that the pairs of rectangular openings in the BoP nose section and the forward engineering hull are windows. This gives us two decks above the cloaking device bulge and two below. If these decks have a height of 3m each, the design length of 110m can be confirmed.

One close-up shows us a lid on the torpedo launcher as it was arguably present on all incarnations of the vessel, so this is not a distinguishing mark that could help in making up plausible different dimensions.

There is only one scene together with the Enterprise that allows to establish a size for the Klingon ship. It appears to be about as wide as the distance between the Enterprise's warp nacelles, about 100m.

Star Trek VI

It is obvious that Chang's prototype is supposed to be essentially the same small ship type again. When the Enterprise crew speculate about a cloaked ship that could have fired at the Kronos One, a Bird-of-Prey is the foremost candidate for a ship capable of cloaking, which suggests that this is the only known cloakable ship type at this time. No size can be determined in the battle sequences. If we see the ship at all, Chang's BoP is well behind or in front of the Enterprise or the Excelsior.

Subsequently the BoP miniature had several appearances in Star Trek: The Next Generation, and although the K't'inga-class battlecruiser was available too, mostly the BoP was chosen to represent a generic 24th century Klingon warship. This is the time when the systematic upscaling of the vessel type begins, supposedly to make it look good and threatening enough next to the Enterprise-D.

TNG: A Matter of Honor

This episode shows us an encounter of the Enterprise-D and the Klingon cruiser Pagh. The Pagh's width in attack mode with the wings down is roughly half of the Enterprise-D's width, and from another perspective its length is at about half of the Federation ship's saucer length. Both comparisons result in a length of 230m. The ship's crew is implied to be more than just twelve, although only few Klingons are shown at a time.

TNG: The Defector

The episode appears to show us extremely oversized BoPs, not much smaller than the Romulan Warbirds (some 1200m in length), but at least the size of the Enterprise-D (642m). Yet, the perspective of the scene is deceptive. Actually, if the two BoPs is the background are about as close to the Warbirds as the one in the foreground is to the Enterprise, they would all be about 350m wide, exactly as in most other TNG episodes. Read more about the 3D reconstruction in Suricata's Blog (archived) .

TNG: Yesterday's Enterprise

When three Klingon cruisers attack the two Federation ships, one of them can be seen passing by above the Enterprise-D. The Klingon ship (in flight mode, wings horizontal) is almost 400m wide, giving us a length of more than 350m. It is obvious the VFX team intentionally scaled them up so as to pose a visually considerable threat to the Galaxy and Ambassador classes. They might have been aware that a large ship is not likely to have movable wings (see scaling paradox ), so their wings remain in the flight position all the time, like already in the brief take in TNG: "The Defector". Moreover, the new name "K'Vort" for the Klingon vessel may suggest this is a different ship type than the familiar small scout from the movies that was simply called "Bird-of-Prey". It has been speculated for some time that K'Vorts exist just in the parallel reality of "Yesterday's Enterprise". But a K'Vort-class vessel was identified in "our" timeline as well, the IKS Koraga, the lost ship with Worf on board that Ezri went searching in DS9: "Penumbra".

TNG: Reunion

The Vor'cha-class cruiser and the two BoPs in flight mode on either side (namely Vorn and Buruk) all seem to have the same width of 350m. This results in a length of 320m for the BoPs.

TNG: Redemption I

The Vor'cha-class cruiser BortaS is attacked by two Birds-of-Prey. One of them is shown directly above the BortaS and seems to have about the same width as in TNG: "Reunion" (350m) in flight mode, which yields 320m length yet again.

TNG: Unification

We can see a BoP facing the Enterprise-D. With the BoP being behind the Federation ship, no upper limit can be given for the Klingon vessel. But it seems like this ship is supposed to be the same size as in the other recent uses of the model in TNG.

TNG: Rascals

The BoP is called "B'rel" for the first and only time. It seems to make sense that the Ferengi could rather have got hold of small and obsolete Klingon ships, the B'rel class, than of the supposedly larger and more powerful ships that are shown elsewhere in TNG, namely the supposed K'Vort class. But actually TNG: "Rascals" features two scenes with 350m long BoPs attacking with their wings up, which are stock footage of the BoPs from "Defector" and of the K'Vort-class cruisers from TNG: "Yesterday's Enterprise", respectively. This renders the whole official theory (in the Star Trek Encyclopedia ) of the B'rel being smaller than the K'Vort incredible. They are evidently the same size! There is just one other scene with the Enterprise-D and one of the Birds in orbit where the latter is at most 300m wide or 260m long. This too is stock footage (from "Redemption I") but was recomposited and resized.

Summarizing, TNG shows BoP types that are noticeably larger than the movie version (more than twice the length) and that don't have foldable wings on five occasions where we would have expected to see them in attack mode with the wings down. They might be all the same size if an uncertainty range of the visual evidence of some 50% is conceded. Unlike we previously assumed, the BoPs in "The Defector" don't have to be any bigger than that.

DS9: Past Prologue

Lursa's and B'Etor's Bird-of-Prey can be seen next to a Danube-class runabout, and it appears to be about five times as long. This would correspond perfectly with the BoP design size of 110m.

Star Trek Generations

Although seemingly unnecessary, the movie introduces "D-12" as another designation for the Bird-of-Prey type, and Worf says the ships have been taken out of service because of technical deficiencies. This detail shows it is supposed to be a different, most likely smaller and less powerful design than the now familiar large TNG types, which would make sense considering that even the B'rel from TNG: "Rascals" is actually quite large. Still, the D-12 is not as vulnerable as one would expect, after all even a weakened Galaxy-class ship should have been capable of penetrating a small BoP's shields, if not completely destroy it, with two or three phaser blasts and one photon torpedo volley. On the other hand, we are tempted to believe that the ship of the two Klingon women is the very same that we saw in DS9: "Past Prologue" and that unquestionably measured around 110m.

DS9: The Way of the Warrior

When the Klingon fleet approaches DS9, there is a number of very small BoPs that are only half the length of a Vor'cha front module. Thus, unlike any other DS9 episodes, it gives us a length of only 50m for the ship. The same can be observed in relation to the Galor class. The BoP that flies by in front of the Cardassian vessel seems to be well below 60m long.

The station Deep Space 9 is anything but a reliable size reference. Yet, we can see that the BoPs passing by measure somewhat less than a tenth of the station's diameter. This would give us about 100m for the BoP with a broad uncertainty range, but definitely substantially longer than 50m. In still the same episode we see a BoP which is almost the same length as the Xhosa , a ship that must measure some 200m.

DS9: Return to Grace

A crew complement of 36 of the BoP is mentioned. This is not necessarily an argument that this particular starship must be bigger than the one from "Star Trek III" with a crew of just 12, but can be taken as a sign that in wartime the Klingon vessels are manned with troops that are not needed on a scout ship on a less honorable and more or less peaceful mission. A helpful size comparison with the Cardassian freighter Groumall is not possible in the episode.

DS9: Shattered Mirror

This is a Mirror Universe episode, and it is rather the Negh'Var that is unreasonably scaled up than the BoP is scaled down. The comparison with a Galor-class ship makes the parallel Negh'Var at least 2,5km(!) long, while the Galor-BoP comparison yields something reasonable between 100m and 200m for the BoP. The Mirror version of the Bird-of-Prey can also be compared to the Defiant, where the latter is somewhat bigger and just as wide as the BoP.

DS9: Soldiers of the Empire

In this and some other episodes Martok's ship Rotarran can be seen docked to the station and is as wide as one outer docking port plus the two neighboring pallets in the rim. Basically, Deep Space 9 is a very bad reference, since the station is routinely scaled up. However, a diameter of 1100m or less would be consistent with the deck structure. This would give the BoP a width of 135m (attack configuration) and a length of 115m, very close to the BoP's original design dimensions. There is also a close fly-by in DS9: "Soldiers of the Empire" that clearly reveals the above mentioned apparent windows in the nose piece, resulting in two decks above the cloaking device.

DS9: Call to Arms

Here the Rotarran is roughly the size of the Defiant , maybe a bit shorter. The latter being in dispute as well, this is not exactly a good reference, but at least it demonstrates that the Klingon ship must be noticeably less than 200m long.

DS9: Sons and Daughters

The Rotarran (in flight mode) is around 2/3 the width of a Vor'cha class, giving it a length of a little less than 200m. Martok says he requisitioned 15 new crew members, which implies that the complete crew consists of 30 or more warriors. Furthermore, a deck 5 is mentioned. This is possible with 2.5m tall decks on a 60m or any longer BoP if the decks are counted from the top of the rearward hull. A 110m BoP could possess 7 decks of 3m each.

In the same episode we see Klingon BoPs protect a convoy of cargo ships. These Klingon cargo ships are modifications of the model of the Cardassian freighter Groumall , and in relation to the BoP they are considerably larger. A much better relative size estimation is possible with the Jem'Hadar fighters, however. The dimensions of these Dominion ships are anything but clear. Anyway, the camera shows the latter in front of as well as behind the Klingon Bird-of-Prey. The two ships appear to have almost the same width, with the BoP being perhaps a few meters wider. In this case both ships would have about the same length.

DS9: Sacrifice of Angels

BoPs appear at the site of the battle for Deep Space 9 and join the Federation forces. The Klingon ship appears to be somewhat smaller than the Defiant, but with a wider wingspan. And both ships are dwarfed by the Jem'Hadar battlecruisers , which are irrationally huge on this one occasion.

DS9: Tears of the Prophets

At the beginning of the battle for Chin'toka, Jem'Hadar fighters begin to ram the Klingon fleet in suicide attacks. Here they look considerably smaller than the BoPs, unlike it still was in DS9: "Sons and Daughters". The Dominion vessels would be considerably less than 100m long assuming a length of 110m for the BoP. Well, they could be 150m long, as sometimes stated, if these BoPs were the big ones from TNG.

DS9: Once More Unto the Breach

The Rotarran can be seen docked to DS9 again, this time from another perspective. The ship may be a bit wider than in "Soldiers of the Empire".

It is remarkable that no big BoP appears in any DS9 episode, except for one appearance of a 200m Rotarran in DS9: "Sons and Daughters", whose length is otherwise consistently 100-150m. David Stipes, Visual Effects Supervisor, gives the VFX length of the Rotarran as 450' = 137m in a newsgroup post (see Starship Size Table ), while there is also a small BoP of allegedly 360' = 110m which corresponds with the original design length. It seems entirely unnecessary to create another, slightly different scale for the Rotarran just for the reason that this one ship should look good next to the Defiant.

Official Explanations

According to the Star Trek Encyclopedia I there are two sizes of Birds-of-Prey: the smaller B'rel class ("Star Trek III", TNG: "Rascals") and the larger K'Vort class (TNG: "Yesterday's Enterprise"). The B'rel is depicted in a size comparison chart together with other Klingon ships, the length is 110m. The size of the K'Vort-class is not specified, nor are other appearances except for "Yesterday's Enterprise" mentioned.

The Star Trek Encyclopedia II depicts an alleged K'Vort-class BoP somewhere between 130m and 160m in the "Ships of the Galaxy" chart. See the Starship Size Table for further comments on the chart's (lack of) reliability. The class name is an obvious mistake because it is postulated everywhere else in the book that the B'rel class should be the smaller type and the K'Vort class much bigger. The chart remains untouched in the updated Encyclopedia III .

The Star Trek Fact Files have various entries about the BoP, but this publication largely conceals the size paradox. The official two sizes (B'rel and K'Vort again) always share the same description, and the impression is created that all BoPs have movable wings and are capable of atmospheric flight and landing. File 34/1 mainly portrays the small BoP, where "B'rel" and "D-12" are used synonymously. The length is said to be only 51.2m. The size comparison in the same file, on the other hand, shows a K'Vort type along with the Enterprise-D, resulting in a length of 320m for the Klingon ship, which would be consistent with TNG: "Yesterday's Enterprise", "The Defector", "Reunion" and "Redemption". The crew of the small ship is given as 12 (standard) to 24 (maximum). File 34/1C depicts a size comparison between a D7 battlecruiser and a nonspecific BoP, where the latter is 110m long. File 34/1D states that a "larger BoP" may have a crew complement of up to 35.

Finally, the DS9 Technical Manual tops all size figures with a length of 685m for the K'Vort-class BoP (consistent only with the exceptionally large ships in TNG: "The Defector", if we still believe in them), whereas for the B'rel a new figure of 158m is introduced. Most likely this medium-sized BoP was originally intended to be of the aforementioned VFX length of 137m, but was accidentally increased. The error probably occurred because the depiction of the Vor'cha in the Star Trek Encyclopedia II size chart is too small relative to the other ships, but Rick Sternbach took exactly this one to determine the other ship sizes in the DS9TM , which therefore appear too large. Further implications of this error are discussed along with the Starship Size Table . The DS9TM also provides a different armament for the K'Vort-class BoP (4 instead of 2 disruptors, 2 instead of 1 photon torpedo tube), which is not viable if the ship looks the same as the B'rel.

Possible Solutions

The screen evidence reveals different sizes of Klingon Birds-of-Prey, and the official publications promote the idea of at least two distinct types. All names for the ships are problematic, since they are used only on isolated occasions and, moreover, the "small" B'rel was not shown as being smaller than the "big" K'Vort. Yet, fandom solutions create up to seven(!) types and sizes of BoPs, namely the tiny ship seen only in DS9: "The Way of the Warrior" (35m), the small scout from "Star Trek III" (50-60m), the D-12/B'rel (110m), the Rotarran (137m according to Stipes), the IKS Pagh (230m), the K'Vort (some 300m) and finally the huge "Defector" and DS9TM BoP (>600m). This reasoning does not take into account that VFX inaccuracies don't allow a distinction of a 110m and a 135m BoP anyway. Moreover, occasionally even one and the same ship (like the Rotarran and very obviously the HMS Bounty) was shown with different dimensions that were further apart than the figures in the above list. Seven sizes is definitely far too much variance. We also need to consider that larger and smaller constructions inevitably require at least slightly distinct shapes in order to avoid the scaling paradox . The number of different sizes has to be minimized, if not reduced to only one size.

The design size of the BoP as evidenced by the scale chart and window rows is consistent at 110m, and the screen evidence from "Star Trek III" largely supports this size. "Star Trek IV" shows the very same "HMS Bounty", but this time it is sometimes at most 60m. On the other hand, the BoP is capable of carrying two humpback whales, and the 60m warship could hardly have the shown spacious cargo bay. This is a reason to favor a 110m size for the Bounty. Another point is that the Rotarran also works at 110m if the Defiant is 120m long and DS9's diameter is 1100m, which corresponds to their supposed design sizes. With these dimensions it would be no trouble to accommodate 36 instead of 12 crew members, even if the cargo bay remains that large. The Rotarran may be somewhat larger than 110m in comparison to the Vor'cha in DS9: "Sons and Daughters", but we may choose to overlook that for the sake of overall consistency.

Another problem is the very small BoP in DS9: "The Way of the Warrior". We may want top ascribe this singularity to careless visual effects. This error would add to the two clear ones in "Star Trek IV": the small BoP on Vulcan and the small BoP in the water.

These ships appear in a number of TNG episodes and are increased to dimensions of 230m ("A Matter of Honor"), 320m ("Reunion", "Redemption") and 350m ("Yesterday's Enterprise", "Rascals", "The Defector"). The 230m Pagh could be interpreted as a small BoP of 110m, since the screen evidence is not that clear-cut and this one ship has movable wings. There are two practicable explanations for the other five ships:

• The five large BoPs are substantially different and much larger types. Due to the lacking resolution of the TV screen they nevertheless appear to have the same hull profile as the much smaller movie type (D-12 class). The large BoPs, namely the evidently largely identical K'Vort and B'rel, have fixed wings and they are obviously serious threats to a Vor'cha, Galaxy or D'deridex class. There is naturally only one size of large BoPs, with a length around 350m. The large BoPs don't appear any more after the time of TNG, which could mean all of them, like the B'rel, are obsolete by then, while the smaller type is still in service.
• The three large BoPs are actually the same size as the small ones, they only appear enlarged by a weird "lens aberration". There might be different types or classes of BoPs, but the hull is always essentially the same size. It is possible that some BoP types don't need to change to a special attack configuration of the wings and are better equipped so as to be a match for much larger ships. The only BoP length is 110m.

The "Titius-Bode" Law of Klingon Ship Sizes found by Mark Dezaire

I was contacted by Mark Dezaire who explained to me his stunning finding that the length ratios of different Klingon ship types are following a similar rule than the planet distances in our solar system - the Titius-Bode Law which is still unexplained although it doesn't look like a coincidence. Well, the "official" Klingon ship sizes are most likely coincidental because too many different people messed around with them, but it's interesting nonetheless.

This is what Mark told me:

"When I was reading the chapters concerning (wrong) ship sizes and the Klingon Bird-of-Prey size paradox, one of my first thoughts was that the larger BoP could be exactly three times the size of the smaller BoP. Then I thought: maybe there is a simple formula for calculating the length of (all?) Klingon ships. After a little time I came to the following 'solution': take the number of the size of the smallest ship, and multiply that, again and again, by the cubic root (I don't know if this is the correct English term for it, I don't even now what it is called in my own native language Dutch) of 3 (= 1.4422496). Now, if you take for granted that the small BoP measures 360 feet (109.728 meters), then you get the following numbers (in meters): 109.7 - 158.3 - 228.2 - 329.2 - 474.8 - 684.7 Most of these numbers resemble very much certain actual Klingon ship sizes that are either canon or that are 'educated guesses'. I'm not saying the Star Trek people (writers, designers etc.) have a hidden agenda concerning what Klingon ships sizes should be, but my numbers don't seem very unlikely, don't you think so? Of course, there might be Klingon ships with different sizes that have been or have not been (yet) on television; and I think you and others are right when you are saying that, for dramatical purposes, some ship sizes are clearly wrong; but on the whole I think my solution is rather simple and effective."

So we have the following sizes, all separated by the cubic root of 3:

• 109.7m - exact original design size of Klingon BoP
• 158.3m - roughly the size Martok's BoP is supposed to (although it should be actually the same size as all small BoPs!)
• 228.3m - exact length of D7 cruiser
• 329.2m - length that the BoPs seemed to have in TNG
• 474.8m - almost exactly the length of the Vor'cha class
• 684.7m - length of the Negh'Var (and of the DS9TM BoP)

Klingon Ship Classes - from all eras

Starship Gallery - Klingon Bird-of-Prey - Scout, D-12, B'rel, K'Vort or whatever name you prefer

Some screen caps by Jörg Hillebrand. I am grateful to Boris S. for invaluable discussion. Special thanks to Jack Bohn for allowing me to use his screen caps. See Jack's analysis of the BoP sizes. Special thanks to Mark Dezaire . Finally, a big thank you to Suricata for reconstructing the scene in "The Defector" in 3D and Jan Kockrow for his analysis of the fly-by in "Star Trek V" and other annotations.

https://www.ex-astris-scientia.org/articles/bop-size.htm

Last modified: 18 Oct 2023

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A Fan Site for the Star Trek Adventures RPG by Modiphius

Official Ship Measurements

Today we bring you a real labor of love, a thorough analysis of ship Scales using Eaglemoss ‘s official ship measurements. This was a lot of work and I’m thrilled to be able to bring it to you to enrich your Star Trek Adventures  campaign.

Christian “Su-tehp” Fernandez-Duque is a lawyer, a Star Wars and Star Trek geek who sees no need for the fandom rivalry between the two (“Dudes, we’re ALL nerds here!”), and a tabletop gamer since 1992 with the advent of the 2nd Edition of Vampire: the Masquerade (which makes him one of the original “tragically hip” gamers). He’s a fan of the Old World of Darkness games, the Trinity Continuum , Exalted , Star Wars D6, and Pathfinder . He got into Star Trek Adventures in late 2020 and is loving every minute of it.

His analyses do have some changes from official publications, which might make you groan with frustration. There are a few different answers to discrepancies between game material and canon sources. Firstly, it’s important to remember that Scale is not length, width, mass, or any other physical property. This is deliberate: Scale is a general estimate of the size and presence of the ship, its ability to combat other ships and to navigate the rigors of space. Two ships of the same Scale don’t have to share any  qualities in common. On the other hand, Scale certainly has something to do with size and Star Trek  isn’t like most science-fiction communities. The fans of Star Trek  pride themselves on technical specifications (just look at the blueprint books!) and fact-checking the physics of this beloved setting. If a change makes your campaign closer to setting canon, shouldn’t you make it?

Well, ultimately this is a rhetorical question. Make the choice if it works for you and don’t if you’d rather stick with what’s printed or what you’ve been using. There’s no question, though, that the most accurate  interpretation of the Star Trek  universe into STA rules is with Chris’ work here. I did mention he’s a lawyer, right?

Changing Scale

If you think adjusting the Scale of a ship might be too much work, you needn’t worry; it’s actually not that difficult. You can even do it on the fly with about two minutes of notes so making the change takes nothing more than sticking to it through each spaceframe. When you change a ship between Scales by some number X (which could be positive or negative depending on if you’re making it smaller or bigger) then the following changes also happen.

• The energy weapons’ damage also changes by X. Torpedoes do not.
• The Crew Support value also changes by X.
• The Resistance value also changes by X.
• Tractor Beam strength also changes by X.
• Technically, the number of Talents should also change by X. This is certainly house-rule-able, though.

Eaglemoss’ Charts

The crux of Chris’ work is these three charts published by Eaglemoss, the official model producers of the  Star Trek  franchise. You can find the charts in the gallery below and whether you are making these Scale changes or not they certainly are beautiful and a fantastic resource for STA campaigns.

Below you’ll find the files that Chris wrote. He went through each and every ship on these charts and compared them, working out a rough length-to-Scale chart for converting. As I noted above and he notes repeatedly here, length isn’t everything. There’s mass to consider, overall shape, and of course precedent for ships of a certain design and character. Chris was thorough, though, and I think you’ll find his reasoning well documented here. Enjoy!

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This was a labor of love that Mephit James and I were working on for weeks to get *just* right. I want to extend my personal thanks to him here. I hope everyone on CM finds this useful. Feel free to post here if you have any questions or comments.

Ugh, I KNEW I let an error slip through somewhere! In the Middle Scale Federation Chart, I mislabeled the Oberth-class’s length as 243 meters (the Miranda’s length which I was using as my text copy-and-paste model) when it should be 120 meters. The Oberth is still Scale 3, though.

And it only took me 7 weeks to find this error by complete accident… :-p

In light of new statistics published in the Shackleton Expanse Campaign Guide and other new information, I’m going to be revamping my Scale statistics for space stations and several Scale margins (most notably the margin between Scale 2 and Scale 3). Most everything will stay the same, but after some adjustments, I will have Mephit James update the links for these documents. Give it a couple of weeks.

…I said a couple of weeks and it’s been more than a couple of months. The good news is, I just got the DISC Season 1 Character Pack PDF from Modiphius and it says that USS Discovery is officially a Scale 4 starship despite its length of 750 meters (which led me to think it could have been Scale 5 or even 6). To be fair, the Discovery is a very streamlined ship and is not nearly massive enough to be Scale 6, but its long length led me to think it was Scale 5. Now we know for sure it’s Scale 4. I will revise my Scale documents accordingly. Dunno when I’m gonna get them reposted though. Stay tuned.

And yes, Sutehp = Chris Fernandez-Duque. I’m having login issues at Facebook so I used a different login just now. 😛

• Pingback: Fernandez-Duque’s Starbases and Ships: Akyazi-Class -
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Whale Probe

Voth city ship.

Federation Size Comparison Chart