Hi Starbird,
>RPM indirectly controls prop pitch in variable pitch props.
>You can't set a given pitch, but the pitch changes when you reduce rpms (the pitch will get coarser).
In a WW2 context, I've often seen "constant speed" propeller mentioned in contrast to "variable pitch" propellers. The constant speed propeller actually was the same as a variable pitch propeller except that it automatically adjusted the pitch to keep (pretty obvious :-) the speed constant.
Actually, in many German aircraft the pilot could select both "variable pitch" and "constant speed" operation modes. In the "variable pitch" mode, he could directly select the propeller pitch which was displayed to him by an indicator that looked exactly like a small clock. Accordingly, fixed pitched settings were referred to with time designations, for example "11:45" for take-off pitch.
>I'm not sure if ww2 fighters had prop reverse, or prop beta controls. I've never seen them mentioned, only in turboprops.
I've to admit that I don't know the term "beta controls", but propeller reversal was pretty rare in WW2 fighters. Messerschmitt had developed a reversible propeller, and in experimental it was found to shorten the landing run of the Me 109 to 100 - 120 m. The Dornier Do 335 also was fitted with a reversible propeller for the same purpose.
(I think the Me 109 was one of the few single-engined fighters to feature a fully feathering propeller, by the way.)
Regards,
Henning (HoHun)