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#16
07-11-2003, 12:15 PM
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#17
07-11-2003, 10:20 PM
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Hello Peter,
German engine manufacturers had various configurations of diesel aviation engines(supercharged,turbocharged,turbocompound and turboprops) but all were left on the drawing boards when the BMW 003 and Jumo 004 axial flow turbojets passed bench testing. Simplicity and light weight of a straight turbojet were the nail in the coffin for high performance, high altitude diesels. I DO NOT have my references with me, but IIRC there was at least one design that had a diesel driving a turbocharger and airscrew with the turbine clutched into the airscrew driveshaft ! One set up (Junkers 86 ?) that actually flew was a diesel in the aircraft fuselage to drive a gigantic surpercharger that supplied the charge pressure air to the main engines. A plumbing nightmare but it flew up to 60,000 feet with real performance up there, no Brit interceptor could get to it. This was made obsolete by the Arado 234 (46,000feet ceiling, 497mph) jet recon plane.
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Nachi11744
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#18
07-11-2003, 10:41 PM
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Nachi:
Whoever started the design, Napier did a tremendous job on it, since it actually ran and was installed in an airframe and was tested enough to set world records for specific horsepower and specific fuel consumption. I don't know if those records still stand (no reason to break them now, I suppose), but they were still top numbers in the late 70's. I think the Nomad was a last gasp attempt for Napier -- the English aero engine groups were being consolidated at Government insistance at a rapid pace in the 50's, and a major American airframe placement was all that was going to keep them independent. They'd already had to give up the Whittle engine to Rolls Royce during the war, and DeHaviland was snooping about, too. Nobody every put that pig (the Nomad) into an airframe to actually use it, though -- looks a maintenance nightmare to me! The Dart turboprop finished off all the piston engines in a stroke, followed shortly by the bypass turbofans. Sorta like nuclear power -- nice idea in principle, but the engineering very rapidly becomes totally unmanagable! Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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