Ju88A-1 propeller CEM :
the A-1 version had no CSP like in the actual gameversion. It had a manual variable pitch propeller like the Bf109E-3 !
It's propeller-levers woked also like the one in the 109 , they were springloaded.
additional there was an automatic setting, that set the rpm to a FIXED 2350rpm , used during the start and the dive.
source ->
http://forum.sturmovik.de/index.php/topic,471.240.html