I played with his system a little bit and agree that the abstraction pays dividends. Actually, I tried to build a 20 ton launch with it, and found that all that was required was (mainly) a table for small spacecraft -- a combo maneuver+power module.
The basis for this is (roughly) the drives in small craft in CT, with advice from the Type A maneuver and power plant.
And blatant stealing from The Oz's post
here .
Combo maneuver drives are less efficient and powerful than the bulky, separated drive systems.
Also, I'm setting the lower bound on combo drives at 80 spaces, and the upper bound at 640 spaces. I'm also only allowing eight standard drives, which more than covers the basic types of small craft we see in Traveller.
</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">Vol is in Spaces
Fuel is in Spaces per week
Drive Combo Spaces-Thrust Vol Fuel MCr
c1 80 5 1 4.5
c2 160 10 2 7.0
c3 240 13 2 8.5
c4 320 15 2 9.5
c5 400 16 2 10.0
c6 480 20 3 12.0
c7 560 23 3 13.5
c8 640 26 4 15.0
Formulae:
(tt = tons thrust)
m-vol(tons) = tt/50
p-vol(tons) to 59 tt = tt/25
p-vol(tons) to 79 tt = tt/30
p-vol(tons) to 99 tt = tt/40
p-vol(tons) 100 tt+ = tt/50
(side note: EP = tt/50)
fuel = p-vol/4
price = 2+2*total vol(tons)
or
price = 2+total vol(spaces)/2, rounded slightly</pre>[/QUOTE]I'd also assume that passenger and cargo craft 10 tons and up would have a "bridge", consuming 20% of the volume, with crew stations calculated backwards from that.
</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">Component Cost per Space
Hull Cr 10,000
Fuel scoops Cr 100,000
Bridge Cr 50,000</pre>[/QUOTE]And here's a Book 2-style drive table.
</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">Performance Table - Hull x Drive
Volume c1 c2 c3 c4 c5 c6 c7 c8
20 4 6
40 2 4 6
60 1 2 4 5 6
80 1 2 3 4 5 6
100 1 2 3 4 4 5 6
120 1 2 2 3 4 4 5
160 1 1 2 2 3 3 4
200 1 1 2 2 2 3
240 1 1 1 2 2 2
320 1 1 1 1 2
380 1 1 1 1
For greater acceleration requirements,
consult Book 2 for M-Drive and Power
Plant requirements.</pre>[/QUOTE]