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Aviation History
1973
1973 - 2792.PDF
FLIGHT International, 15 November 1973 817 Private Flight Tapered Cherokee The PA-28 Cherokee Warrior uses the stretched fuselage of the 180 and 235 series aircraft, with a new wing, tapered outboard of the aileron root position. The wing has an improved aerofoil section, and span increased from 32ft to 35ft. Larger Frise-type ailerons are fitted, giving greatly improved roll control. The outboard leading edge of the wing has a cusped underside to improve stall character istics. Ground manoeuvrability has been improved by increasing the nose-wheel steering angle from 22° to 30° each way. Various improvements have also been made in the cabin, noise Jevel being reduced by use of thicker win dows, doubling the density of the sound-proofing material, adding foam backing to the carpets and sealing off wing and rear-fuselage cavities from the cabin. Pilot and co-pilot seats now have push-button vertical adjustments. The engine is a 150 h.p. Lycoming, giving a top speed of 135 m.p.h. at 2,700 r.p.m., with optimum cruise at 70 per cent power of 133 m.p.h. Stalling speed with 40° flap is 58 m.p.h. Take-off distance to 50ft is 1,760ft and landing distance over 50ft is 1,115ft. Rate of climb at 2,3251b AUW is 649ft/min. The price is quoted at $14,990. Competition The claim that its product has the longest range of any non-military, commercially available single-engined -_ aircraft, made by the Navion Range- master Company, published in Flight last week, was immediately challenged by Avions Robin (UK), which quotes the 55 per cent power range of its HR100/200B Royale as 1,937 miles. It also mentions that its aircraft is, like the Navion, flush riveted. Ambitious American Of the many advanced projects completed by members of the Experi mental Aircraft Association the Polen Special II is undoubtedly one of the most ambitious engineering designs to fly. A home-built aircraft which will climb to 18,000ft in seven minutes and cruise there at 290kt for well over 1,000 miles is an achievement in itself. Dennis Polen also believes in flying in fully equipped comfort. His aircraft has a semi-reclining seat, cabin heating, oxygen for four hours, and full IFR instrumentation. This very substantial, fully aero- batic aeroplane is metal, flush riveted, with hydraulically retractable under carriage (the tailwheel also retracts), fully enclosed by electrically sequen ced doors. With Vne of Mach 0-62, flutter is a primary design factor, calling for dynamically balanced controls. As the surfaces are very small and speeds high, the stick force per g has been Above, the Cherokee Warrior shows off its new wing and window lines. Below, the home- built Polen Special, described on this page. The photograph is reproduced from "Sport Aviation" increased by an artificial system which uses a spring cartridge, bob weight, and a "q-pot". The incorpora tion of such a system, usually associa ted with irreversible controls in jet aircraft, may well be unique in such a small machine. The engine is a 200 h.p. IO-360 turbo- charged Lycoming, giving a power loading of only 7-51b/HP, which accounts for the astounding 3,800ft/ min rate of climb. The propeller is a modified 74in McCauley with constant- speed unit. The flight instrumentation uses non- tumbling gyros powered by a 115V, 400Hz, three-phase inverter. Design work on this remarkable piece of homework began late in 1967, and the first flight took place in May 1972. Since then it has logged over 140 hours. Dennis Polen, writing in Sport Avia tion, says that the main difficulty in flying his aircraft ;n controlled air space is in convincing ATC that an aircraft of this performance is indeed the home-built sports machine which it is claimed to be. •M f^MSM
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