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Leonard Michael Greene

Airplane Stall Warning

• Green patented dozens of inventions in aviation technology, including the device that warns pilots when a deadly aerodynamic stall is imminent.

• Witness to an aircraft accident caused by stall, he realized the pilot could not tell when the angle of airflow over the wing had become excessive. The stall-warning device Greene then invented brought him his first of more than 100 patents to date, 60 of which cover aviation technology.

• At the time, Greene invented the stall-warning device, more than half of all aviation deaths were caused by the stall/spin.

• A Saturday Evening Post article (Oct. 25, 1947) said of Greene's innovation, 'It may be the greatest life saver since invention of the parachute.'