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10 Military Aircraft that Never Made it Past the Test Phase

Ambitious but Flawed Aircraft Concepts

U.S. Army

HK-1 Hercules (The Spruce Goose)

Smithsonian

HZ-1 Aerocycle

U.S. Army

X-13 Vertijet

U.S Air Force

XC-120 Packplane

U.S. Air Force Aeronautic Systems Center History Office

XF-85 Goblin

U.S. Army

Convair XFY Pogo

U.S. Navy

A-12 Avenger II

U.S. Navy

F2Y Sea Dart

U.S. Navy

Dyna-Soar

Boeing

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