Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml@lancaironline.net
Date: Tue, 24 Aug 2004 23:04:23 -0400
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From: "Leon Smith" <jlbk@crestviewcable.com>
References: <list-376667@logan.com>
Subject:  Re: What are the Real Numbers?
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>   skip and anyone flying.
>   What do you see for fuel flows? IO 550N?

> [ an IO550N burns the same in a Ovation, B35, Legacy, ES, sr22
> or columbia... 15gph LOP or 18gph ROP down low, and will
> burn less and less as the HP goes away the higher one flys -Rob ]

Ron;
I have an IO550N Platinum in my ES.  My most routine flight is from
Prineville, OR (18 miles from Redmond) to Davis, CA. which takes 2 hrs and
10 min. takeoff to touchdown, no wind conditions.  I'm generally at 11500'
to 13500' with fuel flow of 11.8 - 12.2 gph which is 60 deg to 90 deg lean
of peak EGT.  At this lean engine operation I still get TAS of 170 -173 Kts.
Normally its just my wife and I with a little luggage, but with the fuel
load, we are within 200-250 lb. of gross.  In terms of passenger miles per
gallon, with 4 people aboard this is an extremely efficient airplane.  Much
better than my old Skylane.

I ran George Braley's fuel flow test and found less than 0.8 gph flow
difference between highest and lowest cylinders.  Not bad for a stock
engine.   I almost always run lean of peak.

Leon Smith
LNCE N63LS