Bill Freeman wrote:

Paul,

OK.  The engine is an X-16, each bank is the same, not
mirror image like a V8, and if you look very closely you can
see the bottom two banks - just barely.  So,  I'd have to
guess a P&W X-16 water cooled engine.  Also, it is direct
drive.

I need to look at my references and find out if they ever
built one, but that is my final answer.

Bill

Actually, could it be a "radial" ??? I thougth they had to have
an odd number of cylinders per bank . . .    OK, another guess.
A 20 cyl water cooled P&W  radial?

Another look makes me think that the interbank angle is 90 deg,
so the X-16 is it since the interbank angle for a 5 cyl per row
4 row radial would be 72 --  OTOH, hard to judge angle with
the WA lense distortion.

Bill
Long EZ builder & pilot
mechanical engineer

Bingo! You got it Bill. A 20 cylinder P&W liquid cooled radial built in 1931.
It was called the R2000 and it had 1,116 HP. Kind of based on Hispano
Suiza cylinder head technology. I think it had master rods. About the only 
way you could do it. Bill Gunston mentioned it in his book
Piston Aero Engines page 135. Parallel cooling.
 
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