|Freedman Burnham Engineering Corporation
Walter E. Burnham Chief Engineer
Freedman Burnham Aircraft
Engineering Corp., In 1942, manufactured three ground-adjustable
50 to 90-hp engines. There are three manufactures that
make the largest percentage of light plane engines.
While these engines are comparable horsepower and rated
R.P.M., each has its own individual crankshaft end.
Each of these shaft ends has commendable features and
is the results of independent design sought out to
be the most economical and dependable arrangement best
fitted to meet the production facilities of the specific
The PC-203 Hub, for the Continental 50hp to 80 hp
engine. The PX-203 Hub, for the Franklin 65 to 90hp
engine. And the PY-203 Hub for the Lycoming 50 to
65 hp engine.
This wood composite ground adjustable
propeller was popular and usually an option on these
Aeronca Trainers, Aeronca Super Cheifs, Cluver, Ercoupe
Swift, Interstate, Luscombe, Silvaire,
90A, Piper Cub
Cub Coupe, Piper
J-4, Piper Cub Cruiser J-5, Porterfield,
Skyranger, Stinson “105”, Stinson
HM-5, and the Taylorcraft.
introduction of the Freedman Burnham adjustable-pitch
propeller at the Chicago Air Show in 1937, two propellers
have received type test approval from the Civil Aeronautics
Administration: the Roby controllable pitch
propeller and the EVEREL
automatic variable pitch propeller.