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When will a diesel be available for my aircraft? |
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News, facts, and comments on the coming revolution for piston-engine aircraft.
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News of July 18, 2005100 hp diesel engine designed to be direct 0-200 replacementFinally some news from the remarkable, British-designed DieselAir or D-Air diesel aero engine, based on the intrapolation of the famous Junkers Jumo diesel 2-stroke of the 30's and 40's, the weight/power ration of which is unbeaten to this day: The Diesel Air engine was shown at the PFA Rally this July. It is a 1.8 litre opposed-piston flat twin two-stroke with a dry weight of 90 kilos (excluding radiators and intercooler). It is rated at 100 hp, at a propeller speed of 2,500 rpm.In layout, the Diesel Air resembles one end of the highly-developed Jumo 207 diesel of the mid 1940s (see http://www.dair.co.uk/documents/press_rel/pilot/pilotnotes.htm and visit notably pg 31); pairs of pistons share bores in the centre of the engine and they drive geared-together crankshafts mounted-in this case, either side of the engine. The blower is a modified production turbocharger compressor and is driven from a step-up gear train via a quill shaft and epicyclical gear set. The 600 bar rotary injection pump is also a modified version of a standard automotive item. Although a turbocharger can be added for extra power, a mechanically-driven blower was chosen for the base engine because a turbocharger alone would not provide sufficient off-load boost to keep the engine running during low-power phases like the final approach. One novelty, the detail design of which Diesel Air is keeping very close to its chest, is a 'torque limiter' which protects the propeller from the diesel engine's characteristically harsh firing impulses, especially at low speed. This engine has been flying successfully for quite some time on a Luscombe high wing taildragger. Visit: http://www.dair.co.uk and note that the Diesel Air Ltd. firm incorporated in the UK has no relations with the DieselAir Newsletter even though they share the same interests. I am convinced that the 2-stroke structure will eventually take a significant market share at least for small engines because it is difficult to build a 4-stroke, 100HP engine that would be light enough. posted at 8:30 AM |
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