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BMW 801A

 
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rwahlgren



Joined: 15 Aug 2003
Posts: 324
PostPosted: Sun Jan 24, 2021 19:49    Post subject: BMW 801A Reply with quote
http://www.enginehistory.org/Piston/BMW/BMW.shtml

The cooling fan? More complexity more HP loss from the fan and the extra drive system. No American air cooled radial aircraft engines (aircraft tractor use engines), have used a cooling fan that I know of.
Yes in helicopters, and pusher applications like the B36. If used in fighter aircraft wouldn't they want to have that extra HP that a fan will use, put to the propeller? It just seems like a waste of fuel and added maintenance problems, as well as the extra parts and assembly in war time production.
Just more moving parts to break and cause problems.
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kmccutcheon



Joined: 13 Jul 2003
Posts: 298
Location: Huntsville, Alabama USA
PostPosted: Sun Jan 24, 2021 21:05    Post subject: Reply with quote
Quote:
No American air cooled radial aircraft engines (aircraft tractor use engines), have used a cooling fan that I know of.

The Republic XF-12 had single-speed cooling fans. Here the problem was keeping the engines cool at the extreme altitude at which the aircraft operated.
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rwahlgren



Joined: 15 Aug 2003
Posts: 324
PostPosted: Mon Jan 25, 2021 12:08    Post subject: Reply with quote
Looks like it could almost compete with jets. At 450 MPH cruise.
My first search showed 400 MPH cruise, then I found this one.
https://www.air-and-space.com/Republic%20XF-12.htm

Shame only 2 were built and both destroyed.
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dpennings



Joined: 10 Dec 2016
Posts: 48
PostPosted: Tue Jan 26, 2021 06:56    Post subject: Reply with quote
the fan wasn't a bad idea at all:

https://www.youtube.com/watch?v=9wb5YzVbTNo&ab_channel=Greg%27sAirplanesandAutomobiles

there was almost no power loss at high speed, butter better airodynamics because of smaller coolent openings and improved cooling at lower speed.
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rwahlgren



Joined: 15 Aug 2003
Posts: 324
PostPosted: Mon Mar 01, 2021 16:13    Post subject: Reply with quote
I saw a video on youtube the guy said the XP-72 had an engine fan?

I think it was in Calum's book it is mentioned the 801 fan took 72 HP to run.
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