Herb Sanders wrote:

Paul, You are good at taking some known data points and solving for

unknowns. The

LBF race at Fon du Lac (Oshkosk 83) was a very well documented real world
condition race for 500 plus miles. See Sport Aviation Nov 83 - page 58.

My Long

flew two aboard at starting wt of about 1400 lbs in July temps and averaged
official 191.92 on fuel burn of 119.2 lbs. The course had 20 pylon turns

and if

flown perfectly, adding the radius of the 20 turns makes the minimum distance
flown about 515miles and actual speed about 198 mph to get credit for the 500
miles. Fuel burn incl warm up and standing start for time and after

flying finish,

you had to fly a pattern, land, and taxi to ramp under power or be

disqualified.

Fuel burn was measured by weigh out and back in on electronic scales in a

closed

hanger. A judge monitored all turns and a penalty was assessed if you cut

a pylon.

The known drag of a clean LongEZ is considered to be 1.6 equiv flat plate

area,

but I don't know how to document that. Maybe Bill Freeman can confirm or

dispute

that. The Lyc 0320 with 10/1 compression and Ellison throttle body was

flown WOT

and way to the lean side of peak at 2600 rpm and cool heads and oil. I

don't know

what the bsfc was for that operation, but I think it was about as good as

a Lyc

can do.

Note that in measured conditions, the Long was more efficient (faster on

less fuel

burn) that the Glasairs and Paser Mustang, but not as efficient as the

purpose

built racers.

Question: What was bsfc for this operation?

Herb Sanders

Herb what is the top speed of your airplane?
Bill and I are trying to come up with the correct number for drag.

Paul Lamar

Herb,

What altitude did you fly at?  This is an important unknown
at this point.  I'm guessing 5-8K MSL, but we need the right value.

Thanks.

Bill Freeman
Long EZ builder & pilot
BSME, MSME
EAA Technical Counselor

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