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Two prototypes were built in 1956, with the first being completed by June 20, 1956. The first production aircraft, powered by a 180 hp (134 kW) Lycoming O-360-A1A engine, first flew on October 21, 1957. In 1958, it was joined by a higher-powered PA-24-250 with a 250 hp (186 kW) Lycoming O-540-A1A5 engine; this model was originally to be known as the PA-26, but Piper decided to keep the PA-24 designation
The original version of the Comanche was the PA-24, which featured a carbureted 180 hp (134 kW) Lycoming O-360-A1A engine, swept tail, laminar flow airfoil, and all-flying stabilator.
The standard fuel capacity of the PA-24-180 was 60 US gallons (230 L). The flaps were manually actuated, controlled by the same Johnson bar actuator as the Piper Cherokee. The aircraft specifications were for cruise speeds of 116 to 139 knots (215 to 257 km/h) and fuel burns between 7.5 and 10.5 gallons per hour (28 and 40 L/h) at 55 and 75% power settings, respectively. Full-fuel payload with standard fuel was 715 lb (324 kg), with a gross weight of 2,550 lb (1,160 kg) and range with 45-minute reserve of 700 nmi (1,300 km; 810 mi).[citation needed]
When new, standard, typically equipped Comanche 180s sold between $17,850 (1958) and $21,580 (1964). A total of 1,143 were built.
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The Mi-4 transport helicopter laid the groundwork of Soviet Army Aviation. It was widely used both in the armed forces and in Soviet civil aviation, and for several decades remained the main type of helicopter in the inventory of the Soviet Armed Forces and of the Civil Air Fleet.
The Mil Mi-4 (USAF/DoD reporting name "Type 36",[1] NATO reporting name "Hound")
An official video of a North Korean Air Force combat flying skills competition released in 2014 shows that the Mi-4 is still in limited service in North Korea