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The PT6 consists of two basic sections: a gas generator with accessory gearbox, and a free-power turbine with reduction gearbox. In aircraft, the engine is often mounted "backwards," with the intake at the rear and the exhaust at the front, so that the turbine is directly connected to the propeller.
Congress only approved the purchase when it was assured that a U.S. source would be found for the PT6T engines. This source was Pratt & Whitney Engine Services in Bridgeport, West Virginia, which was established in 1971 to assemble and test new T400-WV-402 engines. As a result, the U.S. military ordered 294 Bell 212s under the designation UH-1N ...
A free-turbine turboshaft is a form of turboshaft or turboprop gas turbine engine where the power is extracted from the exhaust stream of a gas turbine by an independent turbine, downstream of the gas turbine. The power turbine is not mechanically connected to the turbines that drive the compressors, hence the term "free", referring to the ...
Diagram of a typical gas turbine jet engine. Air is compressed by the compressor blades as it enters the engine, and it is mixed and burned with fuel in the combustion section. The hot exhaust gases provide forward thrust and turn the turbines which drive the compressor blades. 1. Intake 2. Low pressure compression 3. High pressure compression ...
Both engines allow the Moose to take off in roughly 180 m (600 ft). At least one owner has equipped their aircraft with a Pratt & Whitney Canada PT6A-20 turboprop engine [ 2 ] [ 3 ] [ 4 ] and another builder has installed a 460 hp (343 kW) General Motors LS3 V-8 engine.
The engine mounted on the nose could be shut off, decreasing the speed to 180 mph (160 kn; 290 km/h) and increasing the range of the aircraft. It was used by Polair and Maritime Patrol and Rescue . [ citation needed ] It was fitted with skis for use in polar regions and flew in the North Pole region out of Resolute Bay Airport in Canada.
Due to the higher fuel consumption of the turbine engines of the BT-67, compared to the original piston designs fitted to the standard DC-3, range on the standard fuel tank, with 45 minute reserve, is reduced from 1,160 to 950 nautical miles (2,150 to 1,760 km).
In March 2018, Pacific Aerospace launched an updated variant, the Super-Pac XL, with a 900 hp (670 kW) PT6A-140A up from 750 hp and a four-blade 108in (270 cm) Hartzell propeller. It competes with the Supervan 900 re-engined Cessna 208 Caravan with a 900 hp Honeywell TPE331 and 110in four-blade Hartzell propeller. A modified P-750 is ground ...
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