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1937 Abrams P1 Explorer surveillance aircraft with rear engine placement to keep the camera apertures clean and reduce cockpit noise.
https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...914#post194632
https://www.homemadetools.net/forum/...704#post178566
https://www.homemadetools.net/forum/...555#post174069
https://www.homemadetools.net/forum/...052#post160678
https://www.homemadetools.net/forum/...043#post140938
Rear engine, with airborne version of Kort Nozzle (ducted propellor), seems logical approach to reducing prop noise. Fits right in era these gained traction for nautical applications.
https://en.wikipedia.org/wiki/Ducted_propellor
and/ or
https://en.wikipedia.org/wiki/Ducted_fan
This is just an artifact of the photography. A photo of it parked clearly shows that that is just a shroud around the cylinders of the radial engine https://en.wikipedia.org/wiki/Abrams...140188595).jpgQuote:
Originally Posted by Toolmaker51
The front end of this aircraft was copied
and used on the Sikorsky H-5 Helicopter some 6 years later.
Ducted fans are used on IC engine powered model jets to make them look authentic.Quote:
Originally Posted by Toolmaker51
Terrific article, Bruce, amplifies this post. Shrouded the cylinders probably aided cooling, many (most) have airfoil cross sections, IIRC early biplanes so-equipped.Quote:
Originally Posted by bruce.desertrat