Engine power vs altitude

The electric fans replace clutch fans which were an intermediate step. The fan de-clutched at high rpm or when the airflow through the fan over-drove it. Unfortunately the clutches tended to fail after awhile and start to wobble. Since the fan was often mounted on an extension shaft of the water pump a wobbling fan could take out the water pump bearing seal causing the engine to loose coolant.

Jabberwocky said:

Mike has put up hundreds (if not thousands) of original documents on WWII Aircraft Performance and made them freely available for all to look at and share. In doing so, he's performed a valuable service to almost all who use and enjoy this forum.

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Thanks Jabberwocky, I'm glad you find the material on WWII Aircraft Performance of interest.

Here's a couple of primary source documents concerning the Fw 190 D with Jumo 213 engine that tie in with this discussion:

Flugbericht FW 190/170003 V 53 Nr. 1
Flugbericht Fw 190 D-9/210001 Nr. 1
Flugbericht Fw 190 D-9/210001 Nr. 2
Flugbericht Fw 190 D-9/210001 Nr. 3
Flugbericht Fw 190 D-9/210002 Nr. 1
Flugbericht Fw 190 D-9/210002 Nr. 2
Flugbericht Fw 190 D-9/210002 Nr. 3
Flugbericht Fw 190 D-9/210002 Nr. 4
Fw 190 D-9, Climb and Level Speed Performance with C3 Fuel (calculated estimate)
Flugbericht FW 190/0043 V 21 Nr. 1

For translations see: FW 190 D-9 Flight Trials

altsym said:

No doubt he has provided us with original documents, a great service. He has also made glaring mistakes in HIS analysis of some documents, NOT the documents themselves.

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Looking forward to you spending thousands of hours and and a small fortune finding the original documents; you can then develop your own website and present them all with your analysis and conclusions, so some anonymous dweebs on various forums can claim that you are extremely biased/don't know what the hell you are talking about. But then some people just find it easy to gripe and complain about other people's hard work.

Tante Ju said:

I often wonder why never been an "evaluation" of 109F and Spit 5 on ww2performance site. I guess Mike was not yet able to find bad enough graphs for 109Fs... Seriously, the bias of those articles are legendary in aviation community.. the errors (manipulations?) are well known.

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Guaranteed that you have examples of your high quality analysis and unbiased opinion available for us all to read on your own website? Or is this more to your tastes? Kurfürst Discussion Boards • View topic - Nuther quote minus a source ...well informed and completely unbiased.