I highlighted the important bit.

I did the same for you!!

Unfortunately, you don't have any experience operating a variable pitch propeller to know how it works in the air.

Here is how to get extra performance from the Bf-109....

Increase rpm to....

And maintain it by:

All done to maintain 2600 rpm!!!

Given that we know how a variable pitch propeller is operated and the physics of how it transfers power to the air we know this quote:

Is a general statement without context of time line for rpm.

Not a stumbling block though as I said, we know the physics!!

Since propellers are optimal at a specific speed and rpm....

We know what the RLM meant in the their instructions and what Ulrich Steinhilper is telling us both fit together without contradiction!!

But I do, and I can say he has the right idea....

Unfortunately, you don't have any experience operating a Bf-109:rolleyes:

increase RPM you say.....but I thought you said there was no RPM changing?:rolleyes:


1. one had to constantly increase and decrease the propeller pitch.....which makes the RPM change:rolleyes:

2. Increasing the pitch would engage the supercharger, which would be run for a short period (i.e. a second or less?)......a second or less he says....hmmm doesn't sound like it's maintained for long then....but then that would make sense as 2600 RPM was only acceptable for a short period.

Oh wait!....were you not paying attention? 2600 RPM was for a 'short period' only....like a second or less.

A general statement without timeline for RPM?....how about a second or less from your own quote?

But sadly not a skill you are blessed with.:rolleyes:

No, it's a word for word quote. Context can be found left and right of it.

Which is where your confusion lies about "constantly changing rpm". If the setting was only allowed for one minute, they you reduce pitch to reach 2600 rpm and coarsen it as speed increases to maintain 2600rpm for ONE MINUTE or a SHORT TIME!!

Given that we know how a variable pitch propeller is operated and the physics of how it transfers power....

Since propellers are optimal at a specific speed and rpm....

We know what the RLM meant in the their instructions and what Ulrich Steinhilper is telling us both fit together without contradiction!!

It is a fact that you operate a selectable pitch propeller by managing pitch to maitain the a constant rpm at a desired setting....in this case 2600U/min.

Round and round the mulberry bush, mulberry bush....

round and round

Actully that is not correct either..

Allow me..

Hope that helps you see your errors..

Only question left to answer is if you can admit your errors.. ;)

So what are you saying here?... Are you saying that the throttle came into play with what the author is describing. Because when the pitch is adjusted, it also adjusts the RPM in the same motion.

Ah, I see where you are confused..

Note that is not a quote of something I said.. That is a quote of what an actual Bf109 pilot from WWII said

Hope that helps!

Very helpful for others who may visit, don't pull all your hair out:)

Ok..

So on one had we have Crumpp telling us that is how it works, that the 109 pilots coarsen the pitch to maintain the RPM..

So we have an opinion of a modern day civilian trained pilot some 70 years after the fact as to how the 109 pilots did it..

But we also have the following..

Ok..

So we have Ulrich Steinhilper telling us that is how it works, that the 109 pilots constantly changed the propeller pitch and RPM to improve the performance..

So we have the opinion of an actual WWII military trained pilot as to how the 109 pilots did it..

Which is in conflict of how Crumpp said 109 pilots did it..

So at this point there is no need for any further discussion or debate..

Both sides have spoken!

A) Crumpp a modern civilian trained pilot
B) Steinhilper an actual WWII military trained pilot

Thus the only thing left to do is decide who do you want to belive

Crumpp or Steinhilper

For me the choice is simple

Steinhilper hands down!