Quote:
Wow...interesting thread guys (but I did only read the actual page).
But I think you forgot something BckBr: the large bladed prop will fly easier in the airstream during the dive and will then have a tendency to raise the rpm much higher than a 4 bladed one.
More rpm -> pilot will have to reduce throttle during the dive in order to keep eng safe
More rpm -> more tip blade speed hence more drag
Transonic drag being far higher than low subsonic drag, low rpm is better either for your eng (max pow dive) and for your total drag coef.
|
TomcatViP, when fw190a8 flying at max. level speed, it uses 2700 rpm engine. Therefore if fw190A8 dive to a speed much more than its level speed, the engine rotation is definitly 2700rpm. Such as 2500 rpm in a high speed diving is stupid:loss efficiency a lot because of increase of advance ratio.
Let your CSP governer to maintain blade angle and rpm, don't bother thinking about it. And fw190a8's small prop's tip speed is inevitably around critical mach number in a dive, you can't avoid it.