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  #1  
Old November 17th, 2005, 10:14 AM
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Reverse engineering the Book 2 small craft, I find a couple of interesting things going on.

First, crew accomodations are all in the form of two couches, for a total of 1 ton. There is no bridge.

Second, fuel is 1% of thrust, with a minimum of 1 ton.

Third, I found some things that are most likely either errors or fudges (a rose by another name). More importantly, one particular variance (and perhaps two) is probably explained as being a TL effect.

In all cases, drive volume can be determined by the formula:

Volume = 2.7 + DV * tons-thrust

Where DV varies according to the table below:

</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">All volumes are in tons.

TL10? TL12? TL13? TL14?
DV DV DV DV
tthrust fuel DV MCr 0.0612 0.06 0.055 0.046
------- ---- ----- --- ------ ----- ----- -----
launch 20 1 5 14
slow boat 90 1 8.1 15 8.1
boat 180 1.8 13.5 16 13.5
fighter 60 1.2 6 18 6
slow pinnace 80 1 6.4 18 6.38
pinnace 200 2 14.7 20 14.7
cutter 200 2 14.5 28 14.7
shuttle 285 2.85 20.15 33 20.142</pre>[/QUOTE]For reference, here's all of the numbers for all DV ratios.

</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;"> DV DV DV DV
tthrust fuel DV MCr 0.0612 0.06 0.055 0.046
------- ---- ----- --- ------ ----- ----- -----
launch 20 1 5 14 3.924 3.9 3.8 3.62
slow boat 90 1 8.1 15 8.208 8.1 7.65 6.84
boat 180 1.8 13.5 16 13.716 13.5 12.6 10.98
fighter 60 1.2 6 18 6.372 6.3 6 5.46
slow pinnace 80 1 6.4 18 7.596 7.5 7.1 6.38
pinnace 200 2 14.7 20 14.94 14.7 13.7 11.9
cutter 200 2 14.5 28 14.94 14.7 13.7 11.9
shuttle 285 2.85 20.15 33 20.142 19.8 18.375 15.81
gig 120 1.2 ??? ?? 10.044 9.9 9.3 8.22 </pre>[/QUOTE]Here are the tentative conclusions I'm reaching.

</font>
  • The cutter's drive volume is actually 14.7.</font>
  • The fighter's drives are due to high tech.</font>
  • The slow pinnace's drive volume is actually 7.5.</font>
  • The shuttle TL is indeed lower.</font>
  • The launch's drive volume is probably 4.</font>

My "corrected" table would therefore be:

</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">All volumes are in tons.

TL tthrust fuel DV MCr Notes
-- ------- ---- ----- --- -----------------------
launch 12 20 1 4 14 +1 ton to cargo
slow boat 12 90 1 8.1 15
boat 12 180 1.8 13.5 16
fighter 13 60 1.2 6 18
slow pinnace 12 80 1 7.5 18 -1.1 tons from cargo
pinnace 12 200 2 14.7 20
cutter 12 200 2 14.7 28 -0.2 tons from cargo
shuttle 12 285 2.85 19.8 33 +0.3 tons to cargo</pre>[/QUOTE]Although, I'd prefer the Shuttle to be a lower TL design.
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  #2  
Old November 17th, 2005, 10:14 AM
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Reverse engineering the Book 2 small craft, I find a couple of interesting things going on.

First, crew accomodations are all in the form of two couches, for a total of 1 ton. There is no bridge.

Second, fuel is 1% of thrust, with a minimum of 1 ton.

Third, I found some things that are most likely either errors or fudges (a rose by another name). More importantly, one particular variance (and perhaps two) is probably explained as being a TL effect.

In all cases, drive volume can be determined by the formula:

Volume = 2.7 + DV * tons-thrust

Where DV varies according to the table below:

</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">All volumes are in tons.

TL10? TL12? TL13? TL14?
DV DV DV DV
tthrust fuel DV MCr 0.0612 0.06 0.055 0.046
------- ---- ----- --- ------ ----- ----- -----
launch 20 1 5 14
slow boat 90 1 8.1 15 8.1
boat 180 1.8 13.5 16 13.5
fighter 60 1.2 6 18 6
slow pinnace 80 1 6.4 18 6.38
pinnace 200 2 14.7 20 14.7
cutter 200 2 14.5 28 14.7
shuttle 285 2.85 20.15 33 20.142</pre>[/QUOTE]For reference, here's all of the numbers for all DV ratios.

</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;"> DV DV DV DV
tthrust fuel DV MCr 0.0612 0.06 0.055 0.046
------- ---- ----- --- ------ ----- ----- -----
launch 20 1 5 14 3.924 3.9 3.8 3.62
slow boat 90 1 8.1 15 8.208 8.1 7.65 6.84
boat 180 1.8 13.5 16 13.716 13.5 12.6 10.98
fighter 60 1.2 6 18 6.372 6.3 6 5.46
slow pinnace 80 1 6.4 18 7.596 7.5 7.1 6.38
pinnace 200 2 14.7 20 14.94 14.7 13.7 11.9
cutter 200 2 14.5 28 14.94 14.7 13.7 11.9
shuttle 285 2.85 20.15 33 20.142 19.8 18.375 15.81
gig 120 1.2 ??? ?? 10.044 9.9 9.3 8.22 </pre>[/QUOTE]Here are the tentative conclusions I'm reaching.

</font>
  • The cutter's drive volume is actually 14.7.</font>
  • The fighter's drives are due to high tech.</font>
  • The slow pinnace's drive volume is actually 7.5.</font>
  • The shuttle TL is indeed lower.</font>
  • The launch's drive volume is probably 4.</font>

My "corrected" table would therefore be:

</font><blockquote>code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">All volumes are in tons.

TL tthrust fuel DV MCr Notes
-- ------- ---- ----- --- -----------------------
launch 12 20 1 4 14 +1 ton to cargo
slow boat 12 90 1 8.1 15
boat 12 180 1.8 13.5 16
fighter 13 60 1.2 6 18
slow pinnace 12 80 1 7.5 18 -1.1 tons from cargo
pinnace 12 200 2 14.7 20
cutter 12 200 2 14.7 28 -0.2 tons from cargo
shuttle 12 285 2.85 19.8 33 +0.3 tons to cargo</pre>[/QUOTE]Although, I'd prefer the Shuttle to be a lower TL design.
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Old November 17th, 2005, 02:13 PM
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Small Craft Design Core v2

Here's the core rules for small craft design in Book 2 -- at least, as near as I can tell.

Hull price varies by volume.
* Up to 74 tons: KCr250 per ton.
75 tons and up: KCr160 per ton.

All small craft have a 1t cockpit, with room for 2 people.

Additionally, bays cost Cr150,000 per ton. Yes, that's quite expensive.

Select your acceleration, in G's.

Drive volume (t) = 2.7 + 0.06 * hull volume * accel. Max volume = 19.8 tons (285tt).
Drive cost = MCr3.5, plus MCr 0.5 per ton of drive.
Fuel (t) = hull volume * accel / 100
(fuel is always at least one ton).

That's it, folks. All other accessories are standard cost and volume.

What, you want EPs, too?

EP (probably) = hull volume * accel / 100

All power up to the first EP is unavailable for add-on systems.

(*) Milspec designs (like fighters) might require additional rules to increase the price...

Note: The combo drives are now too expensive to consider installing into starships.
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Old November 17th, 2005, 02:13 PM
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Small Craft Design Core v2

Here's the core rules for small craft design in Book 2 -- at least, as near as I can tell.

Hull price varies by volume.
* Up to 74 tons: KCr250 per ton.
75 tons and up: KCr160 per ton.

All small craft have a 1t cockpit, with room for 2 people.

Additionally, bays cost Cr150,000 per ton. Yes, that's quite expensive.

Select your acceleration, in G's.

Drive volume (t) = 2.7 + 0.06 * hull volume * accel. Max volume = 19.8 tons (285tt).
Drive cost = MCr3.5, plus MCr 0.5 per ton of drive.
Fuel (t) = hull volume * accel / 100
(fuel is always at least one ton).

That's it, folks. All other accessories are standard cost and volume.

What, you want EPs, too?

EP (probably) = hull volume * accel / 100

All power up to the first EP is unavailable for add-on systems.

(*) Milspec designs (like fighters) might require additional rules to increase the price...

Note: The combo drives are now too expensive to consider installing into starships.
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Old November 17th, 2005, 04:08 PM
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Very promising [img]smile.gif[/img]
So what's a few square pegs in round holes...
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Old November 17th, 2005, 04:08 PM
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Very promising [img]smile.gif[/img]
So what's a few square pegs in round holes...
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Old November 17th, 2005, 05:08 PM
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There may be a problem with my conclusions.

The 200tt combo drive displaces 14.7 tons, but only costs MCr4.2. Wouldn't a Free Trader prefer that tradeoff, instead of installing an A power and A maneuver drive, for 6 tons at MCr12? That's a savings of nearly MCr8. Sure, the combo drive is larger, but only by 9 tons. A Far Trader might prefer to absorb that and have a lower price tag.

So I'm thinking the drives might have to cost more. Any opinions?

At any rate, the combo drives are obviously less efficient.
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Old November 17th, 2005, 05:08 PM
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There may be a problem with my conclusions.

The 200tt combo drive displaces 14.7 tons, but only costs MCr4.2. Wouldn't a Free Trader prefer that tradeoff, instead of installing an A power and A maneuver drive, for 6 tons at MCr12? That's a savings of nearly MCr8. Sure, the combo drive is larger, but only by 9 tons. A Far Trader might prefer to absorb that and have a lower price tag.

So I'm thinking the drives might have to cost more. Any opinions?

At any rate, the combo drives are obviously less efficient.
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Old November 17th, 2005, 05:28 PM
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I'll take a look at it, robject. It looks pretty close to what I got when I reverse-engineered the CT small craft.
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Old November 17th, 2005, 05:28 PM
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I'll take a look at it, robject. It looks pretty close to what I got when I reverse-engineered the CT small craft.
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