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<< Lancair Builders' Mail List >>
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yes the test was on a rotary. We used the information as part of our initial
work for the UEL rotary engines (ex Norton) for the Navy Jet Labs and
subsequent DARPA project on that engine in the early 90s for a drone engine.
Project later canceled. However, we used the results as part of our testing
on our V8 engines and on the modified Continentals used in the 1993 high
altitude programs with great success for the purpose of lowering the engines
cooling needs at altitude and to reduce the fuel load that had to be lugged
to altitude. This was again used in the 1997 Vela Technology high altitude
rocket launch program.
We then revived the rotary work in 1998 on the UEL engines, which in the
meantime had been bought out by Silver Arrow (Israeli drone company) for whom
we have been doing development work ever since. The results have been in the
same 16% range as per the NASA study on the rotary engines.
The results in the NASA test indicated 16.1% fuel burn reduction if they
coated the rotor and sidewalls. I believe that the lack of squish area and
the generally rotten combustion chamber characteristics of the rotary cause
it to get slightly better fuel reduction than for a piston engine. The
better the design of the combustion chamber the lower the benefits. On the
Lycomings and Continentals with their big open chambers and lack of swirl,
tumble, and squish the gains are 15%. But when we run them on our liquid
cooled V8 engines for the Lancair which run 10.2 / 1 compression on the turbo
engines with a diesel style combustion chamber in the piston top and 100 psi
fuel rail pressure on 45 degree injectors the gains are only 12%. The big
benefit to us on those engines has been the enormous tolerance for fuel that
comes from the reduction of the exhaust valve temperatures and the equally
higher knock threshold. To put this in prospective, since you are a racer,
we hold the worlds C gas Roadster, C gas Lakester record at Bonneville with a
429 cubic inch engine making 1800 hp at 336 mph. We beat the worlds open
wheel car record for even the larger classes with this C class. That engine
makes over 4 hp per cube and has not been apart in 5 years. We also run a
Pro Exhibition NHRA drag car at 140 inches of boost, 2600 hp. The results
are in the new HP Books book on turbochargers.
Darus
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore: http://www.buildersbooks.com/lancair
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