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Aviation History
1938
1938 - 0669.PDF
MARCH IO, 1938. FLIGHT: 243 IMPROVED AERONCA ENGINE Three New Versions IN order to counterbalance the additions of new instrumentsand more luxurious equipment on modern light aircraft,the Aeronautical Corporation of America, makers of thewell-known Aeronca twin, have found a few more " horses " in carefully modified versions of the engine. There are now three versions based on the E-113-C, which is rated at 40 h.p. at 2,540 r.p.m. First, the E-113-CD de- livering 42 h.p. at 2,500 r.p.m. has dual ignition, being fitted with two Bosch magnetos. Secondly, the E-113-CB with similar power rating and engine speed, has a small change in the cam action and timing gears. Lastly, a model having dual ignition and all recent improvements, including an auto- matic overhead oiling system, gives an output of 45 h.p., the AERONCA "45" ENGINE SPECIFICATIONS TYPE.—2 cylinder, horizontal opposed, O.H.Y., air-cooled. WEIGHT COMPLETE.—125 lb., including 2 magnetos and airscrew hub.RATED H.P.—45 at 2,500 r.p.m. CYLINDER BORE.—10S ram. (4lin.).STROKE.—101.5 mm. Uin.). TOTAL DISPLACEMENT.—1,860 c.c. (113.5 cu- '"•)• COMPRESSION RATIO.—5.4 to 1. OIL RESERVOIR.—3 qt. in crankcase. OIL CONSUMPTION (Cruising).—\ pt./hr. FUEL CONSUMPTION (Cruising).—s gall./hr., full throttle 3J gall./hr. ' , . , : FUEL RECOMMENDED.—73 octane. "'.'-•---TAPPET CLEARANCE.—0.005m. on both valves with cold engine. The new Aeronca in part section. extra 3 h.p., incidentally, enabling it to carry the imposing designation "Aeronca '45,' E-113-CBD. ATC 189." It is pointed out that by carrying the whole by-passed oil supply from the pump to the rockers and returning it from the aluminium rocker covers through the push-rod tubes (a) additional oil cooling is achieved ; and (b) the push-rods are kept hot and expand proportionately with the cylinder barrels, so maintaining more accurate tappet clearances. The current model Aeronca engine is built under licence in this country by J. A. Prestwich and Co., Ltd., and distributed by Aircraft Exchange and Mart, Ltd., 7, Park- Lane, London, W.I. -=« •:::-,. •?•---. -,V, r~;t--- -;-,.,.... •••: :•:... . FOR ADVANCED MILITARY TRAINING "Low-Mid-Wing" Monoplane by Koolhoven Cheetah Engine Standard Koolhoven method. A special Koolhoven mounting is pro- vided for the rear free gun. The spaciousness of the rear cock- pit allows for the installation of a bomb sight, camera, or wireless apparatus, and bombs may be carried below the wings. Data relating to the F.K.56 are: Span, 38ft.; length, 26ft.; wing area, 215 sq ft.; weight empty, 220 lb.; normal flying weight, 3,305 lb.; top speed, 187 m.p.h.; landing speed, 50 m.p.h.; climb to 13,000ft., 17.6 niin.; service ceiling, 19,000ft.; jange, 500 miles. British equipment figures prominently in the Dutch Koolhoven two-seat trainer RESEMBLING in layout the little Koolhoven Junior, anew advanced trainer has lately been completed at theKoolhoven plant. Designated the F.K.56, the type is a two-seater ol mixed construction. The inner portionsof the gull-type wings are swept upward, bringing the outer panels to a height corresponding to the mid-wing position.Mr. Koolhoven claims that this arrangement combines the structural simplicity of the low-wing layout with the betterhandling qualities and improved stability of the mid-wing type. The fuselage, which has two seats in tandem, with a trans-parent roof, is a welded-steel-tube structure, but the wing is of wood with box spars, three-ply ribs and stressed three-plyskin. • Slotted ailerons are incorporated. The undercarriage has two independent halves utilising Koolhoven oleo struts,Uunlop medium-pressure tyres and hydraulic brakes. The tracking Ecta tail-wheel is restrained by shock-absorber cords. AD Armstrong Siddeley Cheetah engine is fitted as standard,"at alternative power plants are the Wright Whirlwind or Pratt and Whitney Wasp Junior. There is a sixty-gallon fuel tank111 the iorward fuselage bay and an oil tank behind and above the engine. Armament comprises two fixed machine guns in the wing, K>e being placed behind the rear spar according to a patented
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