Mooney M20F
by John Straton
Title
Mooney M20F
Artist
John Straton
Medium
Photograph - Photograph
Description
The Mooney M20 is a family of piston-powered, propeller-driven general aviation aircraft, all featuring a low-wing and tricycle gear, manufactured by the Mooney Airplane Company.[3][4][5]
The "M20" was the twentieth design from Al Mooney, and his most successful. The M20 series was produced in many variations over the last 50 years, from the wooden wing M20 and M20A models of the 1950s,[5] to the M20TN Acclaim that debuted in 2007.
On 5 November 2008 the company announced that it was halting all production as a result of the late-2000s recession, but would still provide parts and support for the existing fleet.[1][6][7][8]
With the injection of Chinese capital after the company's purchase, production of the M20 resumed in February 2014.[9]
With the exception of the wooden wings and tails of the original M20 and M20A, M20s are all-metal, low-wing aircraft. The wings are of cantilever construction, consisting of a main spar and an auxiliary spar that extends from the fuselage to the mid position of the flaps. The wing skin is aluminum which is flush-riveted in many areas to reduce parasitic drag. Slotted flaps cover 70% of the trailing edge. The earliest models (prior to 1963) have manual flaps. Later models use a hydraulic hand pump to control the flaps while even-later models have electrically operated flaps. The forward fuselage has a steel tube cabin structure covered in aluminum skin, while the aft fuselage is of semi-monocoque design.[citation needed]
The tricycle landing gear legs of the Mooney M20 models are made of heat-treated chrome-molybdenum steel. The main gear legs are attached to the main wing spar, while the nose gear is mounted onto the steel cabin frame. Rubber discs, as well as spring steel, around the legs allow for compression and shock absorption on landing. Except for the fixed-gear M20D, the nosewheel retracts rearwards and the main wheels retract towards the fuselage. Early models use a hand-operated lever system to raise and lower the gear. Later models use an electrically-operated landing gear retraction system with a backup crank-operated or wire-pull gear extender.[citation needed]
The Mooney M20 has medium aspect ratio tapered wings, incorporating 1.5� of washout and 5.5� of dihedral. On the M20J, navigation and anti-collision lights are located inside an aerodynamically designed cover at the wingtips to further eliminate drag. Later M20s are equipped with stall strips to improve the stall characteristics.[citation needed]
The empennage of the Mooney M20 is easily recognizable by its unique tail fin with a vertical leading edge. (The tail fin looks as though it is "leaning forward", but it is approximately vertical in level flight, depending on trim setting.) The horizontal tailplane, which consists of fixed stabilizers and trailing elevators, has no trim tabs. The entire tail assembly pivots at the rear of the fuselage to provide pitch trim.[11]
All M20s store fuel in two separate "wet wing" tanks, which are located in the inboard sections of each wing. Fuel is driven from the tank to the injectors or carburetor by an engine-driven pump, backed up with an electric boost pump.[11] Deterioration of the wing tank sealant can be a problem, leading to expensive rework of the tanks. A modification is available to install rubber bladders inside the existing tanks.[citation needed]
For increased power many M20s also have a ram-air induction system, called the Mooney "Power Boost". For normal operations the intake air is filtered before it enters the induction system. When ram air is selected, partially unfiltered air will enter the induction system with a higher pressure and consequently the manifold pressure will increase about a full inch[vague] when flying at 7500 feet above mean sea level, giving a greater power output.[11] The turbocharged variants omit this feature, as the turbocharger provides a far greater increase in manifold pressure.
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September 9th, 2014
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