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Joeaksa Joeaksa is offline
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Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,833
Terry,

Airplane motors are designed to run a long time at a very low RPM range, usually below 3000 RPM's. When prop's are run faster than that the tips exceed the speed of sound and do not work well.

Do a search for the "pfm 3200" on the net and you will find the 3.2 Porsche motor that was adapted for aviation use in the Mooney aircraft a few years ago. You can also see them on Ebay from time to time. Recently someone was "given" one and tried to sell it on Ebay as a special car motor. A few of us who have flown them recognized it and advised him what it was.

They were not a success due to the cost and low production numbers and for the most part have been replaced with normal airplane motors.

BTW, Jay Leno was driving a Hispano last week in the LA area with a WW1 airplane motor. "Only" 18 liters and very large, but not something you see very often.

Joe
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 2010 Jaguar XF (fast touring car), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB
Old 01-06-2004, 01:38 PM
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