Developed at the urging of Henry Kaiser, its design involved inventing the "artificial feel system" and meeting a World War II mandate to avoid using materials crucial to the military. Intended to have a seating capacity of 750, it used the Duramold technique to impregnate plastic into the substance which gave it its name. For 10 points, name this eight-engine vehicle, intended as a troop transport, which Howard Hughes spent five years building in order to prove that large wooden aircraft could 
Developed at the urging of Henry Kaiser, its design involved inventing the "artificial feel system" and meeting a World War II mandate to avoid using materials crucial to the military. Intended to have a seating capacity of 750, it used the Duramold technique to impregnate plastic into the substance which gave it its name. For 10 points, name this eight-engine vehicle, intended as a troop transport, which Howard Hughes spent five years building in order to prove that large wooden aircraft could fly, before it was abandoned after only one mile in the air.
Developed at the urging of Henry Kaiser, its design involved inventing the "artificial feel system" and meeting a World War II mandate to avoid using materials crucial to the military.
the {Spruce Goose} [or Hughes {Flying Boat H}-{4 Hercules}; or {H}-{4}; {HK}-{1}]