Bell H-12 is an American multi-purpose helicopter developed by Bell Helicopter in 1946.
The design of the helicopter model Bell H-12, also known as the Bell 48, began by American design engineers in 1944. The helicopter was supposed to be exclusively for military purposes and used to perform tasks such as transporting people, transporting goods, conducting observation flights and patrolling the area. This model could not be positioned as an independent combat aircraft, however, for the initiators of the beginning of work in this direction, in particular, we are talking about the command of the US Armed Forces, this was not required, since in fact, for this purpose aircraft of this type and not planned to apply.
Despite the fact that the Bell H-12 helicopter project was definitely promising, the military command of the US Armed Forces decided to abandon the use of such helicopters as irrational, and therefore, for the entire development period, aircraft manufacturers from Bell Helicopter only 12 aircraft of this model were built, some of which were used for testing in the country’s armed forces.
Depending on the modification and version of the aircraft, up to 10 people can be carried onboard the helicopter, including one pilot and 9 military personnel, while in addition to transporting people, the Bell H-12 helicopter could also be used for transporting goods, the only condition for which was preservation cargo dimensions and not exceeding the maximum take-off mass of an air vehicle.
Experts believe that the main reason for the rejection of the use of Bell H-12 model helicopters was their low maneuverability, which did not always satisfy the goals and assigned military tasks.
The propulsion system of the Bell H-12 helicopter consists of one nine-cylinder radial aircraft engine of the brand Pratt & Whitney R-1340-55 Wasp, which, having a thrust of 600 hp, allowed the aircraft to reach a speed of 170 km \ h. (maximum rate). The maximum flight range of this aircraft is 485 kilometers, which, along with speed, is very acceptable.
- Bell Model 42 – 5-seater prototype helicopter, intended for use in the civilian aviation industry;
- Bell Model 48 is a military version of the Bell Model 42;
- Bell Model 48A – a ten-seat version of a military aircraft, equipped with a more productive power plant;
- Bell XR-12 – a prototype aircraft, equipped with 8 seats;
- Bell R-12A – the production version of the helicopter;
- Bell XR-12B – 12-seater prototype helicopter, with improved power plant;
- Bell YR-12B is a production version of the Bell XR-12B version equipped with an aircraft engine of the Pratt & Whitney R-1340-55 brand;
- Bell XH-12 – an analogue of the version of Bell XR-12;
- Bell XH-12B – an analogue of the Bell XR-12 version;
- Bell YH-12B is an analogue of the Bell YR-12 version.
- Crew: 1 person;
- Capacity: 9 people (depending on version);
- The length of the helicopter: 17.3 m. (Depending on version);
- The height of the helicopter: 3,44 m. (Depending on version);
- The diameter of the rotor: 14.48 m. (Depending on version);
- The mass of the empty helicopter: 1870 kg. (Depending on version);
- Maximum take-off weight: 2850 kg. (Depending on version);
- Cruising speed: 145 km \ h. (Depending on version);
- Maximum flight speed: 170 km \ h. (Depending on version);
- Maximum flight range: 485 km .;
- Maximum flight height: 4570 m.;
- Powerplant: Pratt & Whitney R-1340-55 Wasp (Depending on version);
- Power: 600hp (Depending on version).