The Bell H-13 Sioux is a lightweight single-engine multi-purpose helicopter developed by Bell Helicopter in 1945.
A multi-purpose aircraft began to be developed by American aircraft manufacturers on the basis of a Bell 47 model helicopter, however, the design of this aircraft was carried out not after the advent of the current model, but in conjunction with it. The appearance of the Bell H-13 Sioux model helicopter almost completely coincides with the design of the Bell 47 aircraft, however, in terms of operational capabilities and flight performance, aircraft have cardinal distinctive features.
The Bell H-13 Sioux helicopter is to a greater extent used by the US armed forces as a reconnaissance aircraft or as an aircraft for observation and patrol operations. Nevertheless, the helicopter was also used in the civilian aviation sector. However, its operational capabilities were minimal here.
The cockpit of the Bell H-13 Sioux aircraft can accommodate up to four people, which depends mainly on the version of the aircraft, and in addition to transporting people on its board and using it for various special missions and purposes, the Bell H-13 Sioux helicopter can also carry out on board and transporting a small amount of cargo, however, is not a transport aircraft as such.
Among other things, the helicopter can also be used as a means of fire cover, in particular, it is allowed to install one or two machine guns on board to ensure the fight against enemy human resources, however, this helicopter is not positioned as an independent fire weapon.
The propulsion system of the Bell H-13 Sioux helicopter includes one Lycoming TVO-435-A1A piston aircraft engine capable of developing a thrust of 260 hp, which accordingly enables the helicopter to accelerate to a speed of 170 km / h. (depending on the modification of the aircraft and the power plant used), as well as covering distances of up to 440 kilometers, which, taking into account the production period of helicopters of this model, is considered a very acceptable indicator.
- Bell YR-13 – the basic pre-production version of the helicopter, transferred to the US Air Force for testing with the aim of starting further production or improving this model;
- Bell YR-13A – An improved version of the helicopter, designed for operation in cold regions;
- Bell HTL-2 – modification developed by order of the US Navy;
- Bell HTL-3 – modification equipped with a power plant with a capacity of 200 hp.;
- Bell H-13B – An improved version of the helicopter, introduced in 1948;
- Bell YH-13C – an experimental version of the helicopter with a sled chassis;
- Bell H-13C – modification for carrying a stretcher, used as a medical or emergency helicopter;
- Bell H-13D – modification equipped with a Franklin O-335-5 engine;
- Bell OH-13E – a training version of the helicopter, capable of carrying three people on board;
- Bell XH-13F – A modernized version of the helicopter, equipped with a Continental XT51-T-3 engine;
- Bell OH-13G – triple version of the helicopter;
- Bell OH-13H – a modernized version equipped with an engine of the brand Lycoming VO-435 (250 hp);
- Bell UH-13J – VIP-version of the helicopter, designed to transport high-ranking officials of the state;
- Bell OH-13K – test experimental version of the helicopter;
- Bell TH-13L – A modernized version of the helicopter, designed by order of the US Navy;
- Bell HTL-5 – modification equipped with an aircraft engine brand Lycoming O-335-5;
- Bell TH-13M – A modernized transport version of the helicopter, designed for the needs of the US Navy;
- Bell HH-13Q – A modification designed by order of the US Coast Guard, also used as a search and rescue aircraft;
- Bell UH-13R – modification equipped with a gas turbine engine of the Allison brand;
- Bell OH-13S – a triple version of the helicopter, designed to replace the obsolete version of Bell OH-13H;
- Bell TH-13T – double training version of the helicopter;
- Bell H-13 Sioux AH.1 – A modification designed for the armed forces of Great Britain;
- Bell H-13 Sioux HT.2 – a training version of the helicopter, produced by the British aircraft manufacturer Westland;
- Texas Helicopter M74 Wasp – a civilian version of the helicopter used as an agricultural air tool;
- Texas Helicopter M74A – an analog of the Texas Helicopter M74 Wasp version, with an improved power plant brand Lycoming TVO-435 (240 hp);
- Texas Helicopter M79S Wasp II – A modernized version of the helicopter version of the Texas Helicopter M74 Wasp, with a number of technical improvements and additions;
- Texas Helicopter M79T Jet Wasp II – A modification of the agricultural version of the aircraft, equipped with a gas turbine power plant brand Soloy-Allison 250-C20S (420 hp).
According to official figures, over the entire production period, 2,407 aircraft of the Bell H-13 Sioux model was built by American and British aircraft manufacturers.
- Crew: 1 person (depending on the version);
- Capacity: 3 people (depending on version);
- The length of the helicopter: 9.63 m. (Depending on version);
- Helicopter height: 2.95 m. (Depending on version);
- The diameter of the rotor: 11.3 m. (Depending on version);
- Empty helicopter mass: 940 kg. (Depending on version);
- Maximum takeoff weight: 1340 kg. (Depending on version);
- Cruising speed: 135 km \ h. (Depending on version);
- Maximum flight speed: 170 km \ h. (Depending on version);
- Maximum flight range: 440 km. (Depending on version);
- Maximum flight height: 4910 m. (Depending on version);
- Powerplant: Lycoming TVO-435-A1A (depending on the version);
- Power: 260 HP (Depending on version).