109 prop pitch (rpm) and the supercharger

[Crumpp]

Steinhilper says keep working on it constantly

Only issue is that is not what the man says.....

Ulrich Steinhilper, in his auto-biography (chapter 16) , talks about managing the prop-pitch on the early (E3 and E4 variant) 109s during the Battle of Britain. He states that, in order to achieve max climb rate and airspeed (particularly at higher altitudes) one had to constantly increase and decrease the propeller pitch. Increasing the pitch would engage the supercharger, which would be run for a short period (i.e. a second or less?) to force more air into the cylinders, then the pitch would be dropped back down again to disengage the supercharger and convert the power gained into airspeed, and allowing the engine/ supercharger to rest.

He does not say a thing about changing rpm. He says to constantly manage the pitch.

That is what you have to do in order to maintain rpm!!!

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

[Crumpp]

Crumpp says:

The rpm will vary and in a manual selectable pitch propeller, the pilot has to adjust the pitch to maintain rpm.

[Robo.]

Originally Posted by Crumpp

Only issue is that is not what the man says.....



He does not say a thing about changing rpm. He says to constantly manage the pitch.

That is what you have to do in order to maintain rpm!!!

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

If you type it in bold it doesn't make it right. I am not saying you're wrong here (you're not saying anything new here re angine management), you're just completely missing the whole point of this conversation (that is non standard pitch management at high altitudes as described by a LW pilot who has actually been there).

What you're trying to do here is instead of contributing to an interesting topic or even discussing it, you're doing everything possible to prove that you, Crumpp, were right even if you used wrong semantics and therefore said something completely different to actual WWII 109 pilot.

If you're saying that Stainhilper was actually maintaining the rpm even though he was working with the prop pitch lever to get more rpm (here is the catch!) to get a boost from his supercharger above FTH, then you're obviously right and he was maintaining his rpm by rising his rpm for short periods of time.

[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.