WWII, Ranger Aircraft Engine APU, Model V32 Motor For B-29 Superfortress.
AKA the "Putt Putt" Auxiliary Power Unit.
Turns free, not complete, see photos.
For parts or restoration.
According to Wings of History the "Putt Putt" Auxiliary Power Unit was used in the B-26 and the B-29 and did have an on-board APU that drove an electrical generator. Specifically, we found that the B-29 had a twin cylinder 10 HP APU built by the Ranger Aircraft Company. What complicates the research is that the Ranger engine was not used universally, and some APU's were built by the Andover Company and were designated as model V-32's. It seems a 200 ampere, 28 volt, generator was mounted on the APU and it was primarily used for ground operation to start the aircraft's main engines.
A ground support mechanic would enter the tail area of the aircraft, which is where the APU was located, run the APU until engine starting was complete, then shut the APU down and exit the aircraft. The APU was commonly referred to as the "Putt Putt."
The information we uncovered was that the APU was used to: "provide electrical power during ground operations, in emergencies, and to supplement the engine driven generators during takeoffs and landings."
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