page_title: Bell H-13 Sioux
section_title: Military
hierarchical_section_title: Bell H-13 Sioux / Variants / Military
context_page_description: 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.
context_section_description: 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 testbed. Fitted with skid undercarriage and open, uncovered tailboom.
  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) turboshaft. 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 tailboom. 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.
caption: An H-13 with med-evac panniers
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