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Aviation History
1955
1955 - 1847.PDF
970 For ease of accessi- bility, cowling panels of the flat-six Ly- coming are fitted with quick-release fasteners. The engine installation is well shown here. (Below) Maximum-flap posi- tion is at 50 deg, with the ailerons drooping 15 deg. Principle of operat- ing linkage is shown on page 972. FLIGHT Three sketches (right) showing posi- tions of engine, pilot and large freight space, possible top- dressing hopper in- stallation; and pos- sible passenger lay- out with four seats in the main cabin. EDGAR PERCIVAL P.9 . . . consideration in the design of an aircraft for agricultural work. Inthe early days of topdressing in New Zealand a high accident rate led operators to feel that the emphasis should be on repair-ability. With the more recent reduction in the accident rate (because of improved operating technique and larger landing-stripareas), however, it can be argued that repairability, while remain- ing an important factor, should not be regarded as the governingone. In discussing the type of structure best suited to New Zealandoperations, Edgar Percival had to bear well in mind simplicity, in order to achieve a reasonable price; robustness, in order tostand up to the arduous work; and the prime factor of reasonable weight, so that a good economic load could be carried on moderateengine power. "Because I was designing an aircraft that had a more universalapplication than for fertilizing and spraying alone," he told Flight, "I decided a metal stressed-skin wing was called for to meet thedurability case. After due consideration I decided that without doubt the high-wing layout was most suitable for agricultural andrough-country work; and because of the high-wing layout we were able to make use of light-alloy wing covering, since the fertilizeror spray chemicals were unlikely to come into contact with the wing."The fuselage has been made of steel tubing because this material appears to be the most suitable to combat the corrosiveeffect of some of the fertilizers and sprays used in agricultural work. With light-alloy skin covered structures the corrosive effectof the fertilizers used is most marked at the lapped joints and under the rivets."Fuselage.—The fuselage framework is of welded steel tubing, its geometry illustrated in the diagram on page 972. The tubematerial is T.45, the size of tubing varying from half-inch 22-gauge to lfin 14-gauge. At the welded joints, gussets are incorporated :finger-plates will be employed on production machines. From the tail to the freight cabin window, and forward above this windowline to the rear of the pilot's door, the fuselage is fabric covered, wooden stringers being employed on top and side surfaces forshaping. Non-stressed skin panels of 26 gauge, L.72 light-alloy are used for the remaining front and lower fuselage.Main wing-spar and undercarriage loads are taken by the heavy tube frame immediately behind the pilots' seats which carries, inaddition to the main wing and undercarriage attachments, the combined wing-strut and rear lower undercarriage attachmentfittings. The main wing attachment is by means of light fork fittings at the main-spar roots, picking-up on a fuselage cross-tube,the rear attachment being to the tubular trailing-edge member of the wing. The lower undercarriage attachments are machined 27OH.P. LYCOMINC GO-48O-B FLAT-SIX ENGINE .DRIVING HARTZELL C.S. AIRSCREW. STEEL FIREWALL ALL COWLINGS READILY DETACHABLE (NO HINGES)
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