The United States Coast Guard evaluated this model, and procured two HTL-1s for multi-mission support in the New York Harbor.

The Bell 47 was ordered by the British Army as the Sioux to meet specification H.240, with licensed production by Westland Helicopters.

It can be recognized by the full "soap bubble" canopy (as its designer Arthur M. Young termed it),[7] exposed welded-tube tail boom, saddle fuel tanks and skid landing gear.

The H-13 and its military variants were often equipped with medical evacuation panniers, one to each skid, with an acrylic glass shield to protect the patient from wind.

The development of the Sioux was helped greatly by Bell's implementation of a short weighted gyro-stabilizer bar at 90° beneath and to the main rotor.

[8] The stabilizer, which was connected to the cyclic pitch control, acted as a hinged flywheel using gyroscopic inertia to keep the rotor blades in plane and independent of fuselage movement due to wind.

[6] Sri Lanka Airworthy On display Data from Newark Air Museum,[102] Britains Small Wars.

[103]General characteristics Performance Armament Twin .30 in (7.62 mm) Machine guns[b] The H-13 has appeared, and played key roles, in many film and television productions.