![Leroy Grumman stands with man next to aircraft](https://strategicplan.engineering.cornell.edu/wp-content/uploads/2021/12/1930.jpg)
First retractable landing gear for military planes was developed in 1932 by Leroy Grumman, (Mechanical Engineering, 1916). Designed at the request of the US Navy to replace hand-cranked landing gearing, it was first installed on the Grumman FF-1 biplane fight