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Palmgren Auto-plane
 
1910 newpaper reports describe this as an "auto-plane" with folding wings. Two 35hp Adams-Farwell rotary motors geared together so that "if one stops, the other keeps the propeller moving while the first acts as a flywheel." The two motors also revolved in opposite directions to neutralize the gyroscopic effect. Reports failed to mention if it ever flew.
 
 
 
 
 


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