Hello again,
TNE FF&S Mk 1 Mod 0 (January 1994) Book II Subsystems Chapter 9 Sublight (Maneuver) Drives: Self Contained Thrusters p. 60 provides the following instructions for building a solid fuel rocket.
Th: Thrust, in tonnes, per cubic meter of engine.
*Note that solid fuel rockets have no engine volume perse; the
fuel volume is the engine volume. Solid rocket fuel (SRF) mass in
tonnes equals its volume in cubic meters. See FC note below to
calculate solid rocket thrust.
FC: Fuel consumption, in tonnes, per hour per tonne of thrust
To determine volume in cubic meters, multiply by the volume of
the fuel type. For solid rockets, simply pick a fuel mass. Divide the
mass by the FC value. The result is thrust in tonne-hours. Select
either the thrust or the duration, and the other is determined from
that. For example, 18 tonnes of TL-6 SF rocket fuel could have 2
tonnes of thrust for one hour, 4 tonnes for 30 minutes, 1 tonne
for two hours, or any other combination desired, as limited by the
maximum allowed thrust (MaxT column).
Size Efficiency: Solid-fuel rockets with less than 500 kg of
propellant (fuel) mass suffer from inefficient fuel combustion. To
determine the fuel consumption inefficiency of a solid-fuel rocket,
divide 500 by the fuel mass (in kilograms). The result is the final
fuel use multiplier. Multiply the calculated fuel consumption of
the engine by this number. However, any multiplier less than 1
is treated as 1 and any multiplier greater than 10 is treated as 10.
On the Self-Container Thrusters Table a TL 7 SF Rocket MaxT = 1,500 tonnes of thrust for one engine, FC = 7.5 tonnes per hour per tonne of thrust, FT = SRF, and Airframe = Hypersonic.
The Fuel Table shows that SRF has a Density (Volume?) of 1 and the price is Cr 2,000 per cubic meter.
From Book III Chapter 9 Munitions a TL 7 8cm HE warhead mass is 4.8 kg and the volume is 0.96 cubic meters. Using CT Striker the warhead is 5 kg and the propellant needed to travel 1 km is 5 kg.
Using the CT Striker fuel mass of 5 kg or .005 tonnes the thrust is .005/75 = 0.000667 tonnes of thrust per hour. The 5 kg is less than 500 kg which results in a fuel inefficiency value of 10 adjusting the thrust from 0.000667 x 10 to 0.00667 tonnes.
Have I followed the directions correctly?
