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Aviation History
1929
1929 - 0298.PDF
FEBRUARY 14, 1929 and are screwed on to the cylinders by a special arrangement, forming a patent of the company, each head being inter- changeable. The valve seats are of bronze, pressed into the heads, and the valves are operated through rocker arms and push rods, each valve being provided with three concentric springs and one return spring on the push rod. The valves themselves are made of special Wolfram steel. Pistons of special heat-treated aluminium alloy, with domed heads and strengthening ribs, are employed ; each piston has two rings and one scraper ring. The connecting rod sys- tem comprises a master rod and six auxiliary rods ; the former is made of H-section nickel-chrome steel, and the latter are tubular. The big end is of the same type that has given such successful results on other Walter engines, and consists of a double roller bearing with a space between for the auxiliary rods. The latter are carefully balanced to ensure even running. The crankshaft, of Poldi-Victrix steel, is built up in two parts, with counterbalance weights on each part, and is supported by two roller bearings, propeller thrust being taken by a thrust bearing in the front crankcase cover; there is also an auxiliary roller bearing carrying the tail- shaft. The crankcase is of the barrel type, divided circumferen- tially, with end covers. The steel bolts securing the two parts of the crankcase also serve for the attachment of the engine in the engine mounting of the machine. The front part of the crankcase houses the cam disc, which has cams in two rows ; four front cams operate the exhaust valves, while four rear cams operate the inlet valves. The cam disc is driven through a lay shaft by spur gearing. A Zenith 60 D.C.J. double carburettor is fitted, this being mounted on the rear crankcase cover, and supplying mixture to a chamber formed by the side of the rear half of the crankcase and its cover. In this chamber is a centrifugal fan, driven directly by the crankshaft, which assures an even mixture being distributed to the cylinders. The mixture is led from this chamber to the cylinders through seven radiating induction pipes; the chamber, together with the carburettor, are heated by the warm oil from the engine. Lubrication is of the dry sump type, with two gear pumps, mounted on the lower part of the rear half of the crankcase and driven by spur gear from the crankshaft. Oil is collected in a sump located at the lowest part of the crankcase, and returned by the pump to the oil tank via a filter and car- burettor and mixture chamber heater jackets. Ignition is by two Bosch G.F.7 (or two Scintilla G.N.7) magnetos mounted on brackets cast on the front cover, below the crankshaft, and are driven through bevel gear from the cam gear layshaft. Auxiliary transmissions, for petrol pump, r.p.m. indicator, starter, etc., are all located in the rear crankcase cover, where they are completely enclosed and separated from the rest of the crunk-CcLSC The principal characteristics of the 240 h.p. Walter-Castor are :— No. of cylinders .. .. .. 7 Bore .. .. .. .. 135 mm. (5-3 in.) Stroke . 170 mm. (6-7 in.) Compression ratio. . . . . . 6:1 Normal h.p. and speed .. .. 240 at 1,750 r.p.m. Maximum h.p. and speed . . 260 at 1,850 r.p.m. Weight with propeller hub . . 248 kg. (546-8 lbs.) AEROPLANE TYPES THE KINNER "COURIER" A TWO-OR-THREE-SEATER " parasol " type monoplane, for commercial or sporting purposes, constructed by the Kinner Airplane & Motor Corp., of Glendale, Calif., U.S.A. N m — r •• — 35-4* LENGTH ...22'->l£ WING AREA .2152 Sa.Pr. KINNER "COURIER" lOOH? KINNER ENGINE Special features.—Folding tapered wings ; choice of open or closed cockpits. Power plant.—100-h.p. Kinner K.5 5-cyl. air-cooled radial. Wings.—Of standard wood construction, tapering to the tips and also sharply tapered at the roots to a small centre section. Modified "(Kinner) U.S.A,. 27 wing section is employed. The rear spar of each wing is pivoted on the centre section, and in folding, the front spars are unfastened, the front bracing struts removed, and the wings allowed to pivot with the leading edge downwards. The wings then fold back along the fuselage, being supported by the hinged rear struts. Tail Surfaces are of unbalanced type, with adjustable horizontal stabiliser. Fuselage.—Is of standard welded steel tube construction with swinging engine mount. The front, or passenger's, cockpit has the left side cut away for a door. Undercarriage.—Non-axle type, each wheel being mounted on a V attached to the bottom of the fuselage, while the shocks are taken by absorber members extending up to the top longerons of the fuselage. THE KINNER "COURIER" : General arrangement drawings. Specification.— Span Length Height Wing Area Aileron Area Stabiliser Area Elevator area Fin area Rudder area Weight, empty Useful load Total weight High speed Low speed Cruising speed Climb Ceiling . . . .• Cruising range Petrol consumption Oil consumption . . 35 ft. 1 Jin. (10 -7m.). 22 ft. Ill in- (7m.). 7 ft. (2-1 m.). 2152sq.ft. (20m.2). 14 sq.ft. (l-3m.*). 14 sq.ft. (l-3m.«). 8 sq.ft. (0-74 m.2). 4 sq.ft. (0-37 m.!). 4 sq. ft. (0-37 m.*). 915 lbs. (415 kg.). 550 lbs. (249-5 kg.) 1,465 lbs. (664-5 kg.). 120m.p.h. (193 k.p.h.). 35m.p.h. (56k.p.h.). llOm.p.h. (177 k.p.h.). 900 ft./min. (274 m./ min.). 20,000 ft. (609-6m.). 800 miles (1,287 km.\ 7 gals./hr. 2-5pts./hr.
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