TNE Only: Jump Fuel Heresy

[wildfire]

I'm busy working out a way of quickly building ships from FF&S1 and tinkering with the fuel requirements for jumps. After looking through this forum and a lot of mailing list archives decided to try a final modifier to the standard formula, of

10/Tech Level

for a final formula of

Drive volume * 5 / Max Jump Range * (10/Tech Level)

This gives the following mods by Tech Level

TL Modifier
10 1
11 0.91
12 0.83
13 0.77
14 0.71
15 0.67
16 0.63
17 0.59
18 0.56
19 0.53
20 0.50

Until you get to TL20 no ship modifed using these rules can carry enough fuel to effectively double jump with published designs - you can achived a second smaller jump with onboard fuel after TL15 and J2

 

[whartung]

I'm busy working out a way of quickly building ships from FF&S1 and tinkering with the fuel requirements for jumps. After looking through this forum and a lot of mailing list archives decided to try a final modifier to the standard formula, of

10/Tech Level

for a final formula of

Drive volume * 5 / Max Jump Range * (10/Tech Level)

This gives the following mods by Tech Level

TL Modifier
10 1
11 0.91
12 0.83
13 0.77
14 0.71
15 0.67
16 0.63
17 0.59
18 0.56
19 0.53
20 0.50

Until you get to TL20 no ship modifed using these rules can carry enough fuel to effectively double jump with published designs - you can achived a second smaller jump with onboard fuel after TL15 and J2

TL doesn't factor in to drive or fuel volume in FF&S. It only affect drive mass.

Drive volume = 1 + Jn% of the ship.
Total Fuel volume = Drive Volume * 5
Per Parsec Fuel Volume = Total Fuel Volume / Jn

So, 200 ton ship

200 * 14 = 2800 m^3

For Jump 3

Drive Volume = (1 + 3)% of 2800 = 4% of 2800 = 112 m^3 / 14 = 8 dTons
Total J3 Fuel Volume = 112 * 5 = 560 m^3 = 40 dTons
Fuel for a J1 = 560 / 3 = 187m^3 = 13.3 dTons

For Jump 6

Drive Volume = (1 + 6)% of 2800 = 7% of 2800 = 196m^3 = 14 dTons
Total J6 Fuel Volume = 196 * 5 = 980 m^3 = 70 dTons
Fuel for a J1 = 980 / 6 = 164 m^3 = 11.7 dTons

Note, that the single jump fuel for a large drive is less as the Jn goes up. A J6 drive is "more efficient" than a J3 drive.

Also note that in FF&S that the J6 drive fuel is only 35% of the hull vs 60% in HG.

 

[wildfire]

TL doesn't factor in to drive or fuel volume in FF&S. It only affect drive mass.



For Jump 3

Drive Volume = (1 + 3)% of 2800 = 4% of 2800 = 112 m^3 / 14 = 8 dTons
Total J3 Fuel Volume = 112 * 5 = 560 m^3 = 40 dTons
Fuel for a J1 = 560 / 3 = 187m^3 = 13.3 dTons

For Jump 6

Drive Volume = (1 + 6)% of 2800 = 7% of 2800 = 196m^3 = 14 dTons
Total J6 Fuel Volume = 196 * 5 = 980 m^3 = 70 dTons
Fuel for a J1 = 980 / 6 = 164 m^3 = 11.7 dTons

.

All correct I'm just looking to reduce the amount of fuel per parsec at greater tech levels.

For the same hull size as your example a TL15 J3 drive uses
372m3 of hydrogen = 26.6dTons
or 124m3 per parsec = 8.9 dtons

while the same drive at TL12 uses
465m3 of hydrogen = 33.2dTons
or 155m3 per parsec = 11.1 dtons

While a TL15 J6 drive uses
656m3 of hydrogen = 48.9dTons
or 109m3 per parsec = 7.8 dtons

while the same drive at TL12 uses
820m3 of hydrogen = 58.8dTons
or 137m3 per parsec = 9.8 dtons

You can squeeze better performance out of the fuel as your tech level increases which is what I'm after but not to the point you can suddenly do twice the distance that the same ship design could do before if nothing else changes. A bit more strategic flexability at the cost of long transit times as you have to jump twice before refueling or you always have a short distance jump for retreats etc.