Bradford ECAPS' 200N HPGP Thruster is designed for launch vehicle upper-stage reaction control and potential defense applications, such as missile defense. Much of the work into the 200N HPGP has been to investigate potential uses on various launch vehicle upper stage programs, including the Ariane 5ME, and for various spacecraft orbit-raising applications. This thruster is currently in development and looking for partners to bring the prior work into fruition.

  • Propellant loading is simple, fast and avoids the cost associated with loading hydrazine. Allows the operator to spend less time on ground operations and more time on space operations.
  • ‘Fuel at the factory’ – be ready for launch vehicle integration upon arrival at the launch pad. Eliminates significant time and cost from lengthy pre-launch campaigns.
  • Non-toxic propellant is suitable for a new class of responsive small satellite launchers, where handling hazardous hydrazine may impede operations or where fully equipped hydrazine processing facilities may be non-existent at the launch site.
  • Higher performance over hydrazine allows for more payload or longer mission durations.
  • Allows for more agile mission profiles than electric propulsion. Spacecraft take significantly less time to execute maneuvers and orbit changes.

Specifcations Table

Thruster Type HPGP HPGP
Propellant LMP-103S LMP-103S
Thrust Class 200 N 200 N
Primary Operational Mode RCS Δ ∨
Inlet Pressure Range 5 - 26 Bar 5 - 26 Bar
Thrust Range 50 - 200 N 55 - 220 N
Nozzle Expansion Ratio 30:1 150:1
Steady State ISP (vacuum) Typical 2020 - 2300 Ns/Kg
(206 -234 s)
2385 - 2500 Ns/Kg
(243 -255 s)
Density Impulse (vacuum) 2050 - 2852 Ns/L 2957 - 3100 Ns/L
Minimum Impulse Bit ≤ 9 Ns N/A
Overall Length 280 mm 390 mm
Mass 5.7 kg 6 kg
FCV Type Solenoid Solenoid
- No of Seats Single Seat Single Seat
- Pull-in Voltage 28 ± 4 VDC 28 ± 4 VDC
- Holding Voltage 10 ± 1 VCD 10 ± 1 VCD
- Coil Resistance (each coil) 27 Ω 27 Ω
Nominal Reactor Pre-heating Voltage 55 VDC 55 VDC
Regulated Reactor Ore-heating Power 150 - 250 W TBC 150 - 250 W
Target Life - Qual. Level    
Pulses 2,000 10
Propellant Throughput 150 kg 25 kg
Longest Continues Firing 10 minutes 200 s
Accumulated Firing Time 40 minutes 400 s
Firing Sequences 100 10
Demonstrated Life    
Pulses 1,500 1,500
Propellant Throughput 24 kg 24 kg
Longest Continues Firing Time 20 seconds 20 seconds
Accumulated Firing Time 7.7 minutes 7.7 minutes
Firing Sequences 100 100
Maturation Level TRL 5 TRL 3
Current Status    
  Ariane 5 ME Demonstrator Hot Fired Orbit Raiser Phase A Development