Republic XP-72 Ultrabolt Technical Specifications
Service Year: 1944
Type: Prototype High-Altitude Fighter / Interceptor
National Origin: United States
Manufacturer(s): Republic Aviation - USA
Production Total: 2
Structural (Crew Space, Dimensions and Weights)
Operating Crew (Typical): 1
Overall Length: 36.61 feet (11.16 meters)
Overall Width: 40.91 feet (12.47 meters)
Overall Height: 16.01 feet (4.88 meters)
Weight (Empty): 11,473 lb (5,204 kg)
Weight (MTOW): 17,491 lb (7,934 kg)
Installed Power and Standard Day Performance
Propulsion: 1 x Pratt & Whitney R-4360-13 28-cylinder air-cooled radial piston engine developing 3,450 horsepower.
Maximum Speed: 490 mph (788 kph; 425 knots)
Maximum Range: 1,200 miles (1,931 km)
Service Ceiling: 41,998 feet (12,801 meters; 7.95 miles)
Rate-of-Climb: 5,000 feet-per-minute (1,524 m/min)
Armament / Mission Payload
6 x 12.7mm machine guns in wings
4 x 37mm cannons in wings
2 x 1,000lb bombs, Rockets, OR Fuel Droptanks under the wings.
Global Operators / Customers
United States (cancelled)
Model Variants (Including Prototypes)
P-47 "Thunderbolt" - Production Series Designation of base P-47 design on which the XP-72 was built upon; 8 x 12.7mm machine guns.
XP-72 "Ultrabolt" - Prototype Series Designation; two examples constructed; 6 x 12.7mm machine guns; 1 x Pratt & Whitney R-4360-13 Wasp Major engine of 3,450 horsepower.