The Red A03 engine is a diesel V-12 4 stroke piston engine according to Wikipedia. The Red website in Germany is down for maintenance.
So, the Germans have revived the Ram-Air V-1 shutterbug
buzzbomb engine (diesel with a ram-air prop?) Just a thought
https://en.wikipedia.org/wiki/V-1_flying_bomb#/media/File:V-1_cutaway.jpg
