ANTIQUE STINSON BI PLANE EARLY 1920S CROP SPRAYING PROPELLER PUMP DRIVE  RARE.

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ANTIQUE STINSON BI PLANE EARLY 1920S CROP SPRAYING PROPELLER PUMP DRIVE RARE..It took me a extra long time to investigate this one. With no results I was ready to hang it in the garage. Then while watching the mega engineering on history channel, there it was, the engendered mega fire fighting 747 was showing the history of SPRAYING crops. This development was introduced after WW1 the surplus of Steermans could be bought for pennies on the dollar. Pilots would convert the bi plane into a crop duster. That's when I noticed the drive prop for the pump system. And this prop fits the profile. Its missing the trailing edge on one edge but still showes well for a 100 year old drive device.