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Bell H-13 Sioux

The Bell H-13 Sioux is a single engine single rotor light helicopter built by Bell Helicopter. 

Westland Aircraft manufactured the Sioux under license for the British military as the Sioux AH.1 and HT.2.



28 Bell 47A helicopters procured by the United States Army Air Forces for evaluation.

The YR-13 was powered by a 175 hp (130 kW) Franklin O-335-1 piston engine.

10 of the aircraft were evaluated by the U.S. Navy as trainers.


3 YR-13 aircraft winterized for cold-weather testing in Alaska.

Redesignated YH-13A in 1948.


US Navy equivalent of the commercial Model 47D.

12 built.


US Navy equivalent of the commercial Model 47E, powered by a 200 hp (149 kW) Franklin 6V4-200-C32 engine.

Nine built.


65 aircraft ordered in 1948 by the U.S. Army.

All Army versions were later named Sioux.


One H-13B used as engineering test bed.

Fitted with skid undercarriage and open, uncovered tail boom.


16 H-13B aircraft converted to carry external stretchers in 1952, with skid landing gear and open tail boom of YH-13C.


Army two-seat version based on commercial model 47D-1, with skid landing gear, stretcher carriers, and Franklin O-335-5 engine.

87 built.


H-13D configuration with three-seat aircraft with dual controls.

490 built.

XH-13F/Bell 201 

Modified Bell 47G powered by a Continental XT51-T-3 (Turbomeca Artouste) turbo shaft.

The first Bell helicopter powered by a turbine engine.


Three-seater based on commercial model 47-G.

Introduced a small elevator on the tail boom.

265 delivered to US Army.


Based on 47G-2. Equipped with a 250 hp (186 kW) Lycoming VO-435 engine.

At least 453 acquired by US Army.

UH-13Hs were used by the U.S. Air Force.


Two Bell 47J-1 Rangers acquired by the U.S. Air Force for VIP transport of the U.S. President. Originally designated H-13J.


Two converted H-13Hs with a larger diameter rotor and a 225 hp (168 kW) Franklin 6VS-335 engine for test evaluation.


Originally designated as the Navy HTL-4.


Utilized a Lycoming O-335-5 engine.


Incorporated a small movable elevator.

Originally designated as the Navy HTL-6.


Originally the HUL-1G, it was used by the U.S. Coast Guard for search and rescue.


Powered by an Allison YT63-A-3 turboshaft engine.

Original US Navy designation HUL-1M.


Three-seat observation helicopter based on 47G-3B to replace the OH-13H.

265 received by US Army.


Two-seat instrument trainer for the U.S. Army based on the 47G-3B-1, powered by 270 hp (201 kW) Lycoming TVO-435-D1B. 411 purchased.

Sioux AH.1 

General purpose helicopter for the British Army, 50 built by Agusta (Agusta-Bell 47G-3B1) and 250 built by Westland (Westland-Agusta-Bell 47G-3B1).

A small number also used by 3 Commando Brigade Air Squadron of the Royal Marines.

Sioux HT.2 

Training helicopter for the Royal Air Force, 15 built by Westland.

Texas Helicopter M74 Wasp 

Texas Helicopter Corporation single-seat conversion of OH-13E helicopters for agricultural use, powered by 200 hp (150 kW) Lycoming TVO-435-A1E engines.

Certified 1976.

Texas Helicopter M74A 

Texas Helicopter Corporation single-seat conversion of OH-13H helicopters for agricultural use, powered by Lycoming TVO-435 engine rated at 240 hp (180 kW) for 2 minutes.

Certified 1977.

Texas Helicopter M79S Wasp II 

Texas Helicopter Corporation conversion for agricultural use, with tandem seating and stub wing fuel tanks.

Powered by Lycoming TVO-435 engine rated at 270 hp (200 kW) for 5 minutes.

Texas Helicopter M79T Jet Wasp II 

Texas Helicopter Corporation conversion of Bell 47G helicopters for agricultural use, powered by 420 hp (310 kW) Soloy-Allison 250-C20S engines.



1 or 2


3 passengers

(1,057 lb (479 kg) payload)


31 ft 7 in (9.63 m)


9 ft 3 in (2.82 m)

Empty weight

1,893 lb (859 kg)

Max take-off weight

2,950 lb (1,338 kg)


1 × Lycoming TVO-435-F1A six cylinder vertically mounted,

Horizontally opposed air cooled piston engine, 280 hp (210 kW)

Main rotor diameter

37 ft 2 in (11.33 m)

Main rotor area

1,085 sq ft (100.8 m2)


Maximum speed

91 kn (105 mph, 169 km/h)

Cruise speed

73 kn (84 mph, 135 km/h)


214 nmi (246 mi, 396 km)

Rate of climb

860 ft/min (4.4 m/s).



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