Thanks for the replies chaps, all good information!
So going back to fixed pitch props for a sec, presumably the throttle then controlled an air/fuel valve in the carb, so boost/manifold pressure and rpm would both go up or down according to throttle setting?
The constant speed prop set up is a) set required engine revs and b) set throttle to achieve faster or slower airspeed at those revs, making the throttle effectively the pitch control, and there's some automation in making sure enough fuel/air is fed to the engine for those settings?
The two speed prop's throttle then controls what?
Sorry, I always was a bit slow with this stuff!
