Roxel has a comprehensive range of methods for varying the thrust profile on demand of a motor system:
- Pulse motors
- Discrete or continuous variable throat
- Thrust vectoring
- Soft vertical launch
- Hybrid propulsion
- All type of missiles from antitank to Anti-aircraft and missile defence, to Medium range air-to-air and ground to air
- Performance Characteristics
- Increased kinematic performance in endgame
- Increased range
- Mitigate missile induced stresses on missile components
Pulse motors are the simplest way to achieve thrust modulation. The most popular form of pulse motor is the dual pulse motor. They are very promising candidates for the next generation of missiles.
The key characteristic of the motor is the management of different thrust impulses according to mission need.
The pulse management is performed by several propellant charges separated by a frangible bulkhead or a soft membrane, where the charges can be ignited separately (consecutively).
Discrete or continuous variable throat
The discrete or continuous variable throat are a latest technology to achieve an improved thrust modulation.
The key principle is to adjust the thrust on real time demand by mean of a variation of the throat area and consequently of the mass flow which is directly linked to the thrust.
Future version of continuous variable throat will be used in conjunction of extinguishable propellant in order to add the possibility to stop and restart and vary the thrust on demand.
Different technologies for thrust vectoring are in used for decades (jetavator®; intercepteurs de jets, jet vanes, flexible nozzle…).
Recent works are aiming in reducing the manufacturing costs, enlarging the operational temperature range, reducing the mass, the power consumption, achieving larger deflection angles, replacing hydraulic by electrical actuators….
Divert Attitude Control System (DACS) are in service to realise the endgame manoeuvre of extremely high speed missile used to defeat high speed threats.
Recent works have the same objective as said previously. Future versions may use advanced energetic materials, novel hot materials (ceramics…) for the valve and nozzle.
Soft vertical launch
Soft hot vertical launch makes use of different technologies like particle free propellant charge, hot gas valves… in order to obtain an efficient, small, responsive, safe and reliable device that forms the initial trajectory of surface launched missile.
Roxel is involved in the PERSEUS study, lead by the French Space Agency CNES.
The benefit of this technology which inherently allows thrust variation by adjusting the fuel and oxidant mass flow rates by means of an injection system could be used for tactical application.