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1. first mathematical propeller theory combining blade element theory with momentum theory, producing 90% efficient propellers
2. first lightweight aviation engine
3. first 3-axis control system
4. first use of wind tunnel to evaluate wing design of area, aspect ratio, airfoil section and tip shape
5. first research and development program using a series of prototypes to test each feature
6. correctly identifying that control was the primary problem
7. correctly identifying that an airplane must bank in order to turn
8. correctly identifying "adverse yaw" and the rudder as solution
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1. first mathematical propeller theory combining blade element theory with momentum theory, producing 90% efficient propellers
2. first lightweight aviation engine
3. first 3-axis control system
4. first use of wind tunnel to evaluate wing design of area, aspect ratio, airfoil section and tip shape
5. first research and development program using a series of prototypes to test each feature
6. correctly identifying that control was the primary problem
7. correctly identifying that an airplane must bank in order to turn
8. correctly identifying "adverse yaw" and the rudder as solution