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PPRuNe Forums (https://www.pprune.org/)
-   Aviation History and Nostalgia (https://www.pprune.org/aviation-history-nostalgia-86/)
-   -   Pratt & Whitney R-1830 Twin Wasp radial piston firing order (https://www.pprune.org/aviation-history-nostalgia/351353-pratt-whitney-r-1830-twin-wasp-radial-piston-firing-order.html)

barit1 19th Dec 2010 14:58
RecipMech:
R-790 7cyl. Whirlwind
R-975 9cyl Whirlwind
I believe the "R-790" is actually R-760, a.k.a. J6-7, and the R-975 is J6-9.

You could add the P&W R-1340 Wasp (their first engine, 1925) and the R-1535 Twin Wasp Jr. (a 14-cylinder derivative of the R-985).

gbuchanan 21st May 2011 15:26
the firing order of the R-1830 is 1-10-5-14-9-4-13-8-3-12-7-2-11-6
regards gbuchanan


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