Spitfire IIa prop pitch

[Crumpp]

Manual pitch, in what you control the propeller anlge directly:
-Bf109
-Bf110

The VDM propellers are constant speed propellers with an electrical manual pitch that is used for emergencies.

I am not the Bf-109 expert but I believe only a small number of purely manual pitch propellers came into service early on in the 109 series development. IIRC, it was during the Battle of France that a handful were delivered "ohne automatik". It was then replaced with the "mit automatik" which is the VDM hydraulic-electric series used throughout the remainder of the war.