Hi Col, There was about 540 doves built. There was a standard commercial model for 8-11 passengers. also variants for survey,pest control,executive and ambulance. There were also Devon C.1 and Sea Devon C20 Light communication roles with the RAF and the Royal Navy. The devon was fitted with the gipsy Queen engine standard 340 hp. My aircraft is a series 5, 380hp mark 2 Gipsy Queen engines. It had a 20% increase in payload and had a range of 800km. The 4 engine dove you mention is a herron. I don't mean to be rude at all, but the information is easily obtainable. I also have the log books somewhere.
Regards.
Colin.
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