A fixed impulse engine will be a carbon fibre cylinder from one side closed by a carbon fibre wall, and from the other side by a graphite/ceramic nozzle. Inside cylinder will be placed N/M class model rocket composite propellant, capable to deliver desired impulse. On a cylinder will be mounts for a craft’s frame and fixing pins harness. The ignition will be provided by a double reserved ignition system.

Two engines will have a internal compartment for rotation’s masses used in probe’s orientation system.