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rwahlgren
Joined: 15 Aug 2003 Posts: 323
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Posted: Sun Jan 24, 2021 19:49 Post subject: BMW 801A |
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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
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Joined: 13 Jul 2003 Posts: 298 Location: Huntsville, Alabama USA
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Posted: Sun Jan 24, 2021 21:05 Post subject: |
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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. _________________ Kimble D. McCutcheon |
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rwahlgren
Joined: 15 Aug 2003 Posts: 323
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Posted: Mon Jan 25, 2021 12:08 Post subject: |
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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
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rwahlgren
Joined: 15 Aug 2003 Posts: 323
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Posted: Mon Mar 01, 2021 16:13 Post subject: |
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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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