Hughes H-4 Hercules Technical Specifications
Service Year: 1945
Type: Heavy-Lift Transport / Flying Boat Prototype
National Origin: United States
Manufacturer(s): Hughes Aircraft - USA
Production Total: 1
Structural (Crew Space, Dimensions and Weights)
Operating Crew (Typical): 3
Overall Length: 218.67 feet (66.65 meters)
Overall Width: 320.01 feet (97.54 meters)
Overall Height: 79.33 feet (24.18 meters)
Weight (MTOW): 396,832 lb (180,000 kg)
Installed Power and Standard Day Performance
Propulsion: 8 x Pratt & Whitney 28-cylinder R-4360 propeller engines developing 3,000 horsepower each.
Top Speed: 199 mph (320 kph; 173 knots)
Maximum Range: 2,983 miles (4,800 km)
Service Ceiling: 20,899 feet (6,370 meters; 3.96 miles)
Rate-of-Climb: 1,000 feet-per-minute (305 m/min)
Armament / Mission Payload
Global Operators / Customers
United States (cancelled)
Model Variants (Including Prototypes)
HK-1 - Original Design Designation that reflects the collaborative efforts of design and concept from Henry Kaiser and Howard Hughes ("HK").
H-4 - Base Designation with the wihtdrawal of Henry Kaiser from the project.
HFB-1 - Another designation attributed as a recognition of "Hughes Flying Boat - First Design".
Hughes H-4 Hercules (Spruce Goose) Images