Martin AM Mauler

United States attack turboprop aircraft introduced in 1948

U.S. Navy Martin Mauler AM 1 Mauler of Naval Air Test Center
photo: U.S. Navy

The Martin AM Mauler was designed and manufactured by the Glenn L. Martin Company as a single-seat shipboard attack aircraft introduced in March 1948. It was primarily used by the United States Navy and developed during the Second World War. On August 26, 1944, the aircraft took its first flight and was retired in 1953. A total of 151 AM Maulers were built.

Glenn L. Martin Company
United States
1948 to: 1949


1x Pratt & Whitney R-4360-4 Wasp Major
3,000 horsepower
Max Cruise Speed:
290 knots
537 Km/h
Approach Speed (Vref):
Travel range:
1,324 Nautical Miles
2,452 Kilometers
Fuel Economy:
Service Ceiling:
27,000 feet
Rate of Climb:
2780 feet / minute
14.12metre / second
Take Off Distance:
Landing Distance:
Max Take Off Weight:
11,700 Kg
25,794 lbs
Max Landing Weight:
Max Payload:
4,830 Kg
10,648 lbs
Fuel Tank Capacity:
510 gallon
1,931 litre
Baggage Volume:
Seats - Economy / General:
1 seats
Seats - Business Class:
Seats - First Class:
Cabin Height:
Cabin Width:
Cabin Length:
Exterior Length:
12.55 metre - 41.17 feet
Tail height:
5.13 metre - 16.83 feet
Fuselage Diameter:
1.5 metre - 4.92 feet
Wing Span / Rotor Diameter:
15.24 metre - 50.00 feet
Wing Tips:
no winglets
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On August 26, 1944, the first aircraft prototype designated as XBTM-1 took to the skies for the first time. On January 15, 1945, the United States Navy placed an order for seven hundred and fifty Maulers but then it was decreased to ninety-nine following the Surrender of Imperial Japan in August of the same year. On May 20, the second XBTM-1 prototype conducted its maiden flight. Preliminary flight testing conducted with the prototypes showed serious issues with the engine cowling, as well as its fin and rudder which led to the redesign of the aircraft.

The AM-1 Mauler has an external length of 12.5 meters, an external height of 3.7 meters, and a fuselage diameter of 1.5 meters. The tail height is 5.13 meters and the wheelbase is 7.5 meters. It has a wingspan of 15.24 meters and a wing area of 46.1 square meters. The aircraft has an empty weight of 6,920 kg and a gross weight of 11,674 kg. The maximum payload is 4,830 kg and the fuel tank capacity is 510 US gallons.

The Mauler is powered by a single Pratt and Whitney R-4360-4 Wasp Major radial engine. It is a twenty-eight cylinder, supercharged air-cooled four-row radial with two poppet valves per cylinder, gear-driven single-stage variable-speed centrifugal-type supercharger, optional General Electric CHM-2 turbocharger, Bendix-Stromberg PR-100E2 pressure carburetor fuel system, dry sump oil system, and an air cooling system.

The engine produces a maximum takeoff thrust of 3,000 horsepower and drives a four-bladed propeller with a diameter of 4.47 meters. The Mauler has a maximum speed of 290 knots and a cruise speed of 164 knots. It has a combat range of 1,324 nautical miles. The aircraft can fly up to 27,000 feet and can climb at a rate of 2,780 feet per minute.

The AM-1 Mauler could be armed with four 20 mm T-31 autocannon with two hundred rounds per gun, fifteen hardpoints, twelve 130 mm High-Velocity Aircraft Rocket, and three Mark 13 torpedoes.