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A small, high-revving propeller can do the job. Not as well as a large, slow-turning one, but still manageable—and probably just enough to get the aircraft airborne and stable.

As a reminder, some Dornier seaplanes also featured movable propeller shafts.
The movable propeller shaft was not the problem I was thinking of but the propeller diameter. You are right about the "high-revving" ones but were they capable of something like this in the 30s? AFAIR this a/c never flew at all. That's the reason to ask if somebody knows more.
Cheers!
 
This B-26 was flown to Europe for the 80th anniversary of Overlord and then around Europe for a couple of months before returning home. It actually participated in the Battle of the Bulge.

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B-26-67.png
 
A small, high-revving propeller can do the job. Not as well as a large, slow-turning one, but still manageable—and probably just enough to get the aircraft airborne and stable.

As a reminder, some Dornier seaplanes also featured movable propeller shafts.

According to wackypedia it never flew. And we all know how wacky they are. To me 65hp seems marginal for the size of aircraft (and I have flown in a 40hp cub on skis).
 
The book "Parnall Aircraft since 1914" by K. E. Wixey, Naval Institute Press, tells us, should we care, the Prawn was "built as and experimental aircraft for the Air Ministry to determine the effects of a nose powerplant on a flying boat". Stainless steel was used in the structure however "it did not come up to the required standards". "After undergoing trials at Felixstowe the Prawn was used at the MAEE for experimental purposes, but for how long has never been known." It appears not even the size was certain, as approximates were given and even an approximate 100mph max speed. One made 1930. Parnall also made such notables as the Parnall Puffin, Plover, Possum, Pixie, Elf, Imp and Perch.
Material for a Monty Python aircraft company.
 

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