A simple sketch on a TWA napkin by NASA Dryden engineer Frank W. "Bill" Burcham led to development and validation of the Propulsion-Controlled Aircraft concept.
EC94-42805-1
A simple sketch on a TWA napkin by NASA Dryden engineer Frank W. “Bill” Burcham led to development and validation of the Propulsion-Controlled Aircraft concept.October 11, 1994NASA Photo / Dennis Taylor› PCA Project Description