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The Whirlwind Series 1 was still powered by the R-1340 Wasp engine like the original Sikorksy helicopter, but already had the gearbox replaced in the usual British urge to get rid of the inferior American equipment.
This photo is copyright © Peter de Jong, and may not be used or published in any way without permission.
It was added on 29 December 2017, and has since been viewed 136 times.