JL-200 is an experimental engine developed by Helios Engineering for heavy interceptor planes. It utilises a novel compressed-air ramjet design that allows it to start without any airflow, producing more than 300kN of thrust.

Unlike a normal ramjet, which requires the aircraft to be at an aready high speed to start, the CARAMJET uses compressed air injected into the combustion chamber. The air tank allows it to reach a speed at which it can function like a normal ramjet.

Instructions

AG1 enables the air compressor (it uses a small turbine in the front). You can monitor the air tank pressure using the display. Once the pressure reaches at least 30% (preferrably higher), the red light changes to green indicating that you can start the engine. To do that, increase the throttle to 100% and disable AG1. The air pressure will start to drop, giving the aircraft some time to accelerate. At the speed of about 350 kph it no longer needs the air tank

Free to use as a subassembly, just disconnect it from the flight computer. Also ignore the fuselage parts on the sides, they were just used to stabilise it for screenshots (thats why the mass is so high)