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This is an Extremely Rare 1928 Joe Ott Featherweight, Compressed Air Motor (CoA). It is a 6-cyl, .73 displacement air motor. Bert Pond (longtime CoA guru) told me that Joe hand built 10 of these, long stroke, lightweight motors, and only sold them to the top competitors, and to his friends. It is 6" diameter, and weighs only 3 ounces!! . In photo #2, look at the craftsmanship, and detail, of the connecting rods! This motor is 84 years old , and I was told that it was never flown. This motor is shown in the America Model Engine Encyclopedia, on page 201. These CoA motor/tanks, are inflated by a normal automotive tire pump, either a Hand Pump, or 12V Electric Automatic Pump. Also included in this auction is a pre-carved balsa wood prop, 2 formed, thin brass end caps, air needle valve, and air filler valve, and a coil of .005" x 60" brass shim stock to build a 30" long brass air tank. Also included are easy to follow instructions from Bert Pond's fine CoA book, on how to build a CoA air tank. It is pretty easy to form the brass around a mailing tibe, and solder the seam, which builds a tank capable of holding 150 psi. The tank can be fabricated in 2-3 hours, by any modeler.