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Aviation History
1909
1909 - 0673.PDF
OCTOBER 23, 1909. FLIGHT ENGINES AT PARIS SHOW—(continued from page 626). Darracq 3O-h.p.—Twin - cylinder, horizontal opposed type, water-cooled engine. The cylinders are made of steel, cut from the solid, and are fitted with copper water - jackets silver soldered in place. Both valves are placed verti- cally on the cylinder-heads, and are mechanically operated by rock- levers and tappets- Large per- PARIS FLIGHT SHOW.—View of the 30 - h.p. twin - cylinder Darracq, which has been used by M. Santos Dumont. orations (about J in. in diameter) relieve the exhaust at the end of the stroke. An inclined shaft, bevel driven from the crank-shaft, drives the magneto and the water-pump in a very neat manner, and lends considerably to the compactness of the design. Oil is sprayed into the crank-chamber by a pump, and any lubri- cant which tends to come out into the atmosphere through the relief-valve is trapped and drained back into the sump. Dimensions.—130 mm. by 120 mm.; weight, 52 kilogs. ; h.p., 30 at 1,500 r.p.m. ; price, 6,000 francs. R.E.P. 35-h.p.—Seven-cylinder semi-radial air-cooled engine, the design of which has already been described in FLIGHT. The latest model, however, now has separate inlet and exhaust-valves placed diagonally in the cylinder-heads instead of the com- bined valves used formerly. Both valves are controlled by the same rock-lever, which is operated by a double-acting tappet-rod. The tappet-rod motion is communicated by a cam-ring having a grooved path. The new model is about 20 kilogs. heavier than its prototype owing to this change in design, but the combined valves were not found altogether satisfactory, and were abandoned. Dimensions. —85 mm. by 95 mm ; weight, 90 kilogs. ; h.p., 35 at 1,400 r.p.m. : juice, 11,000 francs. E.N.V. 40-h.p.—Eight-cylinder V-type water-cooled engine, built on the same lines exactly as the 6o-h. p. model already described in FLIGHT. The cylinders are cast-iron, but have electro- lytically deposited copper water-jackets. The pistons are steel and their rings cast-iron. The crank-chamber is a one-piece aluminium casting and has detachable end-plates. Five ball-bearings support the crank-shaft. All the valves are mechanically operated from the single cam-shaft which lies above the crank shaft. Lubrication is provided by a pump which forces oil through( the crank-shaft, up the connecting-rods and into «Nh the gudgeon-pins. The oil-hole in the gudgeon- pins is set so that it only coincides with the feed- pipe on the down stroke of the piston in order not to admit oil to the cylinder walls too near the combustion-chamber. A minor detail in construction which is new on this model is the introduction of a steel ball as an intermediate member between the cams and the valve tappet-rods. Dimensions.—%$ mm. by 90 mm. ; weight, 68 kilogs. ; h.p., 40 at 1,500 r.p.m. ; price, 7,500 francs. E.N.V. 24-h.p.—This model may be expected in London in the course of six weeks or so. It will differ from the standard design in having steel cylinders cut from the solid and a combined inlet and Paris Flight Show. — Sec- tional sketch, showing the valve - tappet guide on the E.N.V. engine. A = guide, B = hard steel bush, C = push- rod, D = hard steel ball. Paris Flight Show. — Sec- tional sketch, showing the electrolytically - deposited copper water-jacket on the E.N.V. engine; also the inclined valves. exhaust-valve in each cylinder-head. There will only be four cylinders. Dimensions.—109 mm. by 110 mm. ; weight, approx. 30 kilogs. ; h.p., 24 at 1,200 r.p.m. ; price, 4,000 francs. [To be continued.) PARIS FLIGHT SHOW.-In the new R.E.P. engine, here shown in place on a monoplane, there are two separate valves in place o£ the combined valve which formerly con- trolled both ialet and exhaust. PARIS FLIGHT SHOW.—The new 40-h.p. E.N.V. engine, showing the position of the carburettor. 675
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