My association with the wonderful chippie goes.back to 6AEF at White Waltham in 1966 as an ATC cadet.
I must search out my 3822 (lovely to see later generations refer to it as a 'Desmond') and retrieve some detail.
Next RN grading at Roborough. Then owned a bit of WP 809 for many years, also towing gliders with Lycoming chippies.
Regarding the British use of the greenhouse canopy over the Canadian bubble, I was told by one of the hoary old Roborough instructors that it was to aid escape or rescue in the event of nosing over and coming to rest inverted, a very different problem if trapped in a bubble.
Delightful thread Coff. I'll try and find some pictures too.