Bill Freeman wrote:

Paul,

Clearly a Franklin, apparently with a planetary reduction drive.
Based on what I saw in old Lyc and Continental planetary
reduction engines, I'd guess late 40s to early 50s vintage,
probably about 300 cubic inches, so let's guess about
220 hp at the higher RPMs possible with the redrive.

Pure guesswork, except is IS a Franklin (spark plug locations).

Bill Freeman
Long EZ builder & pilot
BSME, MSME
EAA Technical Counselor

Everybody that said Franklin is right. I don't know the displacement
but it is 115 HP at 3500 RPM with a planetary PSRU. I came from some kind
of WW II Army liaison plane.

Paul Lamar
 
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