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Generally, a back fire requires unburned fuel to be reaching the exhaust side, where it explodes.

If its carb icing, the venturi gets so restricted, air can't flow through...so fuel is sprayed,...

http://stratus2000.homestead.com/files/stratusnew/ea81engine.jpg


http://stratus2000.homestead.com/files/stratusnew/ea81descript.htm
...

I would think the calculations for actual thrust from various combinations of blade area and pitch, rpm, LFM/CFM, etc, to compare to actual drag figures for the potential hull configurations....would...

Just popping on to say hi!

I hope to spend more time here discussing these contraptions.

:twisted: