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Aviation History
1936
1936 - 0405.PDF
d FLIGHT. FEBRUARY 13, 1936 AN UNUSUAL TWO-STROKE Unconventional Gas-transfer System in New German 22-h.p. Engine for Ultra light Aircraft W ELL known in the past by virtue of its motor cycle work, the Schliha Company of Berlin has just brought out a re markably '' clean '' flat-twin two-stroke engine, known as the F.iaoo, for ultra-light air craft. The new engine is unconventional in its method of operation. A study of the accompanying diagrams will show the working principle. Each piston (A) carries on its crown a tubular extension (B) projecting into a correspond ing extension of the cylinder head. This tube is blanked at its outer end and has a ring of holes (E) near this extremity. The upper drawing shows both pistons at their top dead The Schliha engine without its carburetters and magnetos. centres, and it will be observed that mixture (indicated by arrows at C) is entering on the crank case side of the pistons. As the pistons descend in the cylinders the gas is com pressed in the crank case, and passes through the interior of the pistons into the extension tubes Meanwhile, the pistons, on reaching their bottom dead centres, have uncovered the Studied in conjunction with the text, this sectional plan and elevation of the Schliha engine explain its mode of operation. exhaust ports (D). Simultaneously, the annular holes in the extension tubes are uncovered as the tubes emerge from their guides, and the compressed gas is allowed to pass into the working cylinders; the pistons then rise, cover the exhaust ports and compress the charge in the working cylinders. On the charge being fired by the plugs the pistons move down wards and the cycle is repeated. Among the advantages claimed are very efficient cooling ot the pistons by the passage of the cool incoming gas; de creased piston wear, owing to the guide effect of the exten sion tubes; and good turbulence and scavenging. The crank case is cast in two sections in Elektron, and the cylinders are also of Elektron, being fitted with steel liners, The pistons are of Titanal alloy, and the H-section connect ing-rods, which have roller big-end bearings, are of chromt- nickel steel. The two-throw crankshaft is of the same material and runs in two roller and one ball bearing. Lubrication is on the petroil principle in the proportion of one-twentieth part of oil. There are two carburetters and two magnetos, and two sparking plugs per cylinder. The two magnetos are arranged at the rear of the crank case. Principal data on the Schliha engine are as follows:— Bore, 94 mm.; stroke, 100 mm.; total capacity, 1,196 c.c; normal power, 23 h.p. at 2,200 r.p.m.; maximum power, 36 h.p. at 3,100 r.p.rri.; weight dry (without airscrew hut;), 75.8 lb. (34.4 kg.); weight per h.p., 3.3.-2.12 lb. (1.5 to 0.056 kg.); fuel consumption, 0.57 lb./h.p./hr.; length, 53 mm.; width, 860 mm., height, 225 mm.; price in Germany Rm. 950 (approximately ^77 10s. at the present rate of exchange). FRITZ WITTEKIND. A BELGIAN OBSERVER Hf ?^P^^^^*^^^i Fitted with the French Gnome-Rhone Mistral Major tourteen-cylinder radial bl 870 h.p., this Belgian Renard R-32 observation monoplane—which also functions at will as a two-seater fighter or light bomber—has a maximum speed of 230 m.p.h at 13,120 ft. It stalls at 59 m.p.h., has a service ceiling of over 37,000 feet and a range of 800 miles. Its somewhat peculiar wing is said to show interesting characteristics on climb and during a landing : the machine will reach 16,400 ft. in 7 minutes. A notable feature is the cockpit enclosure.
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