Bell H-13 Sioux

1st Flight 1945

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.

Variants

YR-13/HTL-1 – 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.

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

Redesignated YH-13A in 1948.

HTL-2 – US Navy equivalent of the commercial Model 47D.

12 built.

HTL-3 – US Navy equivalent of the commercial Model 47E, powered by a 200 hp (149 kW) Franklin 6V4-200-C32 engine.

Nine built.

H-13B – 65 aircraft ordered in 1948 by the U.S. Army.

All Army versions were later named Sioux.

YH-13C – One H-13B used as engineering test bed.

Fitted with skid undercarriage and open, uncovered tail boom.

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

H-13D – Army two-seat version based on commercial model 47D-1, with skid landing gear, stretcher carriers, and Franklin O-335-5 engine.

87 built.

OH-13E – 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.

OH-13G – Three-seater based on commercial model 47-G.

Introduced a small elevator on the tail boom.

265 delivered to US Army.

OH-13H/UH-13H – 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.

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

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

TH-13L – Originally designated as the Navy HTL-4.

HTL-5 – Utilized a Lycoming O-335-5 engine.

TH-13M – Incorporated a small movable elevator.

Originally designated as the Navy HTL-6.

HH-13Q -Originally the HUL-1G, it was used by the U.S. Coast Guard for search and rescue.

UH-13R – Powered by an Allison YT63-A-3 turboshaft engine.

Original US Navy designation HUL-1M.

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

265 received by US Army.

TH-13T – 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.

Specifications

Crew: 1 or 2

Capacity: 1 passenger or 2 litters (1,057 lb (479 kg) payload)

Length: 31 ft 7 in (9.63 m)

Height: 9 ft 3 in (2.82 m)

Empty weight: 1,893 lb (859 kg)

Max take-off weight: 2,950 lb (1,338 kg)

Powerplant: 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)

Performance

Maximum speed: 91 kn (105 mph, 169 km/h)

Cruise speed: 73 kn (84 mph, 135 km/h)

Range: 214 nmi (246 mi, 396 km)

Rate of climb: 860 ft/min (4.4 m/s).

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