Talaria Fusion Thruster

From Growing Horizons

The Talaria He-D Fusion Thruster is the main propulsion system used by modern spacecraft and named after the winged sandals of the Greek god Hermes. Based around a Helium 3-Deuterium fusion reactor, this thruster was first developed by Lockheed Martin in 2053 after more than twenty years of development by the legendary Skunkworks. During the lifetime of Lockheed Martins patent, the Talaria thruster has been licensed by almost every major aerospace company, leading to many modern thruster system to share the same lineage and basic design, even going as far as allowing different thusters from different producers to share replacement parts.

The basic principle of the Talaria is similar to a nuclear thermal thruster, only that the fission reactor core has been replaced by a fusion reactor that produced a much higher temperature, allowing heating up more propellant, usually water, to a higher temperature. One feature of the Talaria however is its complete variability. Both the fusion reaction itself, and the flow rate of the propellant can be changed, allowing the thruster to work at high exhaust velocities and low thrust at low flow rate and reactor power and low exhaust velocity and high thrust at high flow rates and high reactor power.

The main feature of the thruster however is that only 0.01 percent of the total heat produced by the thruster is retained within the magnetic cage of the thrusters itself. The remaining heat is either carried away by the propellant, or is directed directly into deep space by the cleverly designed magnetic containment. As such only relatively small waste heat radiators are needed when the thrusters are under power.

Fuel Flow (kg/s) Exhaust Velocity (m/2) ISP (s) Thrust (kN) Δv (m/s) Acceleration (m/s²) TWR
0.10 17320508.08 1765597.15 1732.05 19028523.02 0.09809 0.01000
0.50 7745966.69 789599.05 3872.98 8509814.20 0.21934 0.02236
1.00 5477225.58 558330.84 5477.23 6017347.32 0.31019 0.03162
5.00 2449489.74 249693.14 12247.45 2691039.53 0.69360 0.07070
10.00 1732050.81 176559.72 17320.51 1902852.30 0.98090 0.09999
50.00 774596.67 78959.91 38729.83 850981.42 2.19335 0.22358
100.00 547722.56 55833.08 54772.26 601734.73 3.10187 0.31619
500.00 244948.97 24969.31 122474.49 269103.95 6.93599 0.70703

As seen on above the Type 25 Escort craft is capable of reaching up to 2/3 at a propellant flow rate of 500 kg/s, at the nominal thruster power rating of 7500GW, though it can only maintain this level for 71 hours. Usually a thruster is only used at a lower power rating and flow rate to preserve propellant, but thrusters can be used safely at up to 120 percent of their nominal rating.

The largest Talaria Fusion Thruster available on the open Market is the Rolls Royce TFR 300, rated at 30000GW of power.