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TA3 Errata (Starship Tons)

clementk

SOC-14 1K
Ok, so according to page 223 of the THB, "One Displacement ton is equal to [...] 1400 volume."
Been trying to fit a custom wheeled or tracked ATV design into the vehicle bay of the good ship Hidalgo.

According to TA#3, a ATV of 10,000vl takes up 3.6 Starship Tons. But according to the above, it should take up 7.14 starship (displacement) tons. :rolleyes:

FWIW, the hanger space required for a ATV in the THB is 8 tons which further matches the 7.14 figure.

It looks like at least some of the others are off as well, getting late in the day so I've not run them all through yet.

So could someone else please look into this or tell me what I'm doing wrong/missing here. :confused:

Casey
 
Hello Casey,

Depending on were you read 1 dton is either 1400 or 1350vl. I get the dton dispalcement of the ATV as 7.41 (10000/1350 = 7.407) or 7.14 (10000/1400 =7.142). In THB on p. 274 under COmponents the Vehicle Hanger states "a starship/spacecraft must allocate storage space equal to the size of the vehicle (in tons)." So depending on which constant (1400/1350) you can allocate the exact space, without leaving room for maintenance, for the ATV or add some maintenance space. In GURPS: Traveller the number Vehicle Bay (VB) modules required is found by multiplying the vehicle dtons/volume/size by 1.05 which results in the VB requiring either 8 (rounded up from 7.7805) for the 7.41 or 7.5 (rounded up from 7.4970) for 7.14.


Originally posted by Casey:
Ok, so according to page 223 of the THB, "One Displacement ton is equal to [...] 1400 volume."
Been trying to fit a custom wheeled or tracked ATV design into the vehicle bay of the good ship Hidalgo.

According to TA#3, a ATV of 10,000vl takes up 3.6 Starship Tons. But according to the above, it should take up 7.14 starship (displacement) tons. :rolleyes:

FWIW, the hanger space required for a ATV in the THB is 8 tons which further matches the 7.14 figure.

It looks like at least some of the others are off as well, getting late in the day so I've not run them all through yet.

So could someone else please look into this or tell me what I'm doing wrong/missing here. :confused:

Casey
 
Originally posted by Casey:
Ok, so according to page 223 of the THB, "One Displacement ton is equal to [...] 1400 volume."
Been trying to fit a custom wheeled or tracked ATV design into the vehicle bay of the good ship Hidalgo.

According to TA#3, a ATV of 10,000vl takes up 3.6 Starship Tons. But according to the above, it should take up 7.14 starship (displacement) tons.
What you are missing is that TA3 uses a different conversion of VLs to starship displacement tons.

TA3 p. 6 has the conversion descriptions. And the table follows that conversion rather than the rules in the T20 book. If you want to use the T20 book rules, double the values given in the TA3 table.
 
Originally posted by tjoneslo:
What you are missing is that TA3 uses a different conversion of VLs to starship displacement tons.
This is presumably an error, rather than a deliberate rules modification? If not, what were they thinking? The garages are pretty tight as the rules stand (that's why Air/Rafts default to open top - it's so the crew can get in without taking it out the garage :rolleyes: ), but halving the space required allows a jeep to fit into a starship fresher! :eek:
 
Originally posted by ninthcouncil:
This is presumably an error, rather than a deliberate rules modification?
It was deliberate. After designing the 24 vehicles in TA3, plus the array of grav vehicles, and the 30 or so boats and watercraft for the next TA's, I found the T20 vehicle conversions to make vehicles too large. It actually gets worse with the larger vehicles.

The Starship fresher is also huge. As are the starship staterooms. Most deckplans draw the accomodations at half the size listed, the other half being access space and the life support machinery.
 
IIRC, it says that the fresher/stateroom are x dtons and includes the needed passageway/access/machinery etc.

That's true for about anything, unless you want a ship that's like an Hive with no passageway
 
Originally posted by tjoneslo:
It was deliberate. After designing the 24 vehicles in TA3, plus the array of grav vehicles, and the 30 or so boats and watercraft for the next TA's, I found the T20 vehicle conversions to make vehicles too large. It actually gets worse with the larger vehicles.
Good work incidentally, TA3 will be very useful to me; but I'm still having difficulty with the size thing. The canonical wheeled ATV is a massive vehicle (check the 3sq x 5sq plan in Mission to Mithril / Across The Bright Face - and the illustration in TA3 for that matter). 15 deckplan squares, 7.5 dtons; the 8 dton garage is hardly looking oversized.

With drives and staterooms the size is somewhat abstract, and as you point out, it is possible to chop them down a bit to get more circulation/access/service space (the 50% deckplan shrinkage is an exaggeration, though - 75% is more like it, e.g. the classic 2sq x 3sq stateroom). The fresher, incidentally, doesn't seem half so huge if you assume it to contain a shower as well; my bathroom at home is slightly less than 2 deckplan squares and is distinctly cosy. (As an aside, I generally assume that much of the life support etc. is in the floor/ceiling space and hence invisible on a simple deckplan; it helps explain the absence of such things in classic starship designs. All very well till your waste recycling goes wrong and yesterday's lunch starts re-emerging through your cabin floor.)

I think some of the confusion here is that the TA3 values refelct actual volume, whilst I'm more concerned with garaging space, which isn't directly addressed in TA3, but is what the THB seems to be describing. For smaller vehicles the headroom allowed by a starship standard deck height is excessive, and you could design some sneaky ways to take advantage of this - I'm sure those space conscious Solomani naval architects already have. I was hinting at this when I suggested standing a jeep in a fresher on its end - not to mention amusing myself with the image of storing a jeep in a toilet.


To relate this to the real world, the Renault Espace has ground dimensions of 4.51m x 1.81m. The "Van" in TA3, which appears to be a very similar class of vehicle, is listed at 1.1 dtons. Considering its lack of height, that seems fairly reasonable. But I'd say that to allow entry via the vehicle doors, the Espace would need a 2sq x 3sq garage, i.e. 3 dtons.

Even in this light, though, the 4 dton ATV is still problematic, as its height must be approaching a full deck. I can't see the canonical ATV fitting into 4 dtons without it being flat packed, or maybe inflatable.
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The other way to look at this is: The TA3 volume is the volume of the vehicle itself. The T20 book gives the volume of the garage to hold the vehicle and still allow access. So TA3 gives the size of the packing crate for the vehicle, double it if you want to have access to the vehicle with anything other than a fork lift.

So I could put the Jeep into your fresher. As a prank. You aren't going to do anything useful with it until you get it out of there.
 
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