Dual-Rotation Propellers

[Bailey]

Found this article which may prove of interest.

Covers the design of the Aeroproducts Dual-Rotation propellers used on the Fisher XP-75, Republic XP-72, Boeing XF8B-1 and Curtiss XBTC-2.

http://www.enginehistory.org/Convention/2009/Presentations/AP_Piston.pdf

Regards Bailey.

 

[blackkite]

Thanks! Very interesting.

 

[pathology_doc]

Interesting! Thanks for that.


I wonder if all contraprops embody the same basic principles. It would be an interesting thing to see details of the design fitted to late-model Griffon Spitfires and Seafires by way of comparison.


Trying to synchronize machine-guns to fire past those must have been a nightmare.

 

[memaerobilia]

Trying to synchronize machine-guns to fire past those must have been a nightmare.

Not certain if they had nose guns in it. They may have just used the wing-mounted guns? Here is an original photo from Curtiss files of the "XBTC-2 Model B"

 

[Spark]

Hi.

Very interesting Design

Martin Baker solved an “oil problem” with the UK contra-rotating airscrews but can not remember if it was solved for the Spitfire or the Shackleton first.

Circa 1940 the two Fairey completely variable–pitch three bladed propellers
Weight per pair = 570 lb. (11’ 6’’ diameter)

Interesting! Thanks for that.


I wonder if all contraprops embody the same basic principles. It would be an interesting thing to see details of the design fitted to late-model Griffon Spitfires and Seafires by way of comparison.


Trying to synchronize machine-guns to fire past those must have been a nightmare.