The P.13a was an experimental interceptor aircraft designed in late 1944 by Dr. Alexander Lippisch, as conventional fuels were in short supply, proposed to powered by coal-burning ramjet. It never past the drawing board.
The mesh drum holding coal granules and revolving, ignited by gas burner once it reached operating speed(red box). Huh......yes, it could not get there on itself, maybe need to shot off or towed.
This PM Model's kit was extremely simple and not fitted well, must have to add some panel lines on it.
Here is the result:
Thanks for your watching!