BobsV35B(at)aol.com
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 Posted: Sat Mar 20, 2010 3:44 am Post subject: Request Info on Jabiru and the Airmaster 420 Constan... |
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Good Morning Pete,
Excellent observation!
May I add that it is easier to run on the lean side of peak EGT if the engine is operating at 65 percent power or less. Getting the engine fuel flow well enough balanced to use lean side operations is another matter, but when it can be done, the engine runs cooler. cleaner, and burns less fuel per horsepower delivered.
Happy Skies,
Old Bob
AKA
Bob Siegfried
Downers Grove, Illinois
Stearman N3977A
In a message dated 3/19/2010 1:07:23 P.M. Central Daylight Time, pete(at)usjabiru.com writes:
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I think you will find that the 2200 + airmaster will cost more than a 3300 engine. As far as economy – it will take the same amount of gas to pull a 750 along at 95 mph no matter what engine you use. It takes a certain amount of power to produce that amount of work. You can use a 3300 that may be throttled back a bit or use a 2200 at a higher power setting. They will use the same amount of fuel flying the same aircraft at the same cruise speed. Add in the high drag of the 750 and you will never get a whole lot of speed vs GPH.
Example: On the trip to Oshkosh from Tennessee last year. Flying side by side with a Jabiru J170 with 2200 and a Jabiru J230 with 3300 engine. The 3300 was throttled back and burned less fuel that the 2200 in the J170 at a 105 knot cruise.
We saw the same thing with the 701. At the same cruise speed the 3300 used the same fuel burn. He larger engine was loafing along at lower rpm.
Pete Krotje
Jabiru USA Sport Aircraft, LLC
931-680-2800
www.usjabiru.com
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