109 prop pitch (rpm) and the supercharger

[kohmelo]

Originally Posted by Crumpp

The pitch must be constantly adjusted to maintain rpm as the speed increases!

ummm... So he was only shifting his supercharger rpm? could you please explain to me how he did that.

[Crumpp]

that is non standard pitch management at high altitudes as described by a LW pilot who has actually been there

He does not say or do anything "non-standard". He just explains the right way to manage the pitch on the propeller is to constantly change it.

That is why you hear the pulsing of the pitch change. You hear that at any governor check on run up of a CSP equipped aircraft.

[Robo.]

Originally Posted by Crumpp

He does not say or do anything "non-standard". He just explains the right way to manage the pitch on the propeller is to constantly change it.

Oh yes he does indeed. Below the fth there was no point in overreving the engine for a speed gain. At higher altitudes, there apparently was. As I said, you completely missed the point of this conversation and Steinhilper did not maintain the rpm, he was changing it constantly into higher values (hence the term 'overreving'). I am sure every reader of this thread understood that by changing the rpm up and down you're not exactly 'maintaining' it.

The interesting technical fact here is the supercharger function regarding engine rpm, because this seems not to be modelled in the game yet and as far I can tell, the engine management described by BoB pilots won't work in game. The engine works just like below FTH.

[Crumpp]

Oh yes he does indeed.

I don't see it in any of the direct quotes.

[Robo.]

Originally Posted by Crumpp

I don't see it in any of the direct quotes.

He didn't say explicitly it was non standard, but that was the main reason he described it in his book. And the main reason we quote that part in here. I am sure that even you can see that. It would be good to have this modelled in the sim, don't you think?

[Crumpp]

He didn't say explicitly it was non standard, but that was the main reason he described it in his book. And the main reason we quote that part in here. I am sure that even you can see that.

Well, the only quotes I can find do not say a thing about non-standard or varying rpm.

They only talk about managing pitch.

[ACE-OF-ACES]

Originally Posted by Crumpp

Well, the only quotes I can find do not say a thing about non-standard or varying rpm.

They only talk about managing pitch.

Actully that is not correct..

Steinhilper talks about varying the pitch of the prop to increase the RPM of the engine..

Originally Posted by Ulrich Steinhilper

When we flew at that height, the engine only just gave enough pull and we constantly changed the propeller pitch and RPM to improve the performance. With a flat pitch we could increase the RPM of the engine and get more pressure from the super-charger. Then, by changing the pitch to a coarser setting, we could make up some speed.

Hope that helps! S!