Model Aircraft Styled Air Engine, Experimental

The first in my model aircraft compressed air powered engine series, "Model Aircraft Styled Air Engine, Experimental" was the result of yet another challenge; build a single cylinder compressed air engine using the fewest number of parts, and all 100% 3D printed. Weighing in at a mere .8 ounces (25 grams), this engine requires only 8 3D printed parts (only one more than my "3D Printed "Wobbler" Style Air Engine" design), no purchased parts, and incorporates a rotary valve (as I used before in my "Four Cylinder Air Engine, Experimental" design) with a difference. The rotary valve used in this design was inspired by the 1933 work of Joseph S. Ott (and no, I wasn't around then to see it) which utilizes the propeller axle as both an axle and a valve. The valve timing is determined by the angular offset between the flat surfaces on the axle and the pin on the journal. As an added bonus, the design provides a fairly decent exhaust system. I learned quite a lot during the design of this