I can get a better match with his data if I assume the Cozy
has more drag....

Paul, looks as if your calculations are close, Phill is another

Cozy/Subi

builder:

http://www.geocities.com/plmjohnson/characterising4.htm
Phill is a good detail oriented engineer
...Chrissi

ADRAG =  2.024838915587521


It is kind of laughable that the ADRAG coeff. is calculated to a zillion
places :-) It is also interesting that Don Bates and I came up with
more or less the same number for the Cozy.

Other than this it is a great web site. He gets an A.

Paul Lamar

Paul,

As I calculated a while back . . .   1.6 sq ft * 1.28 = 2.05

Bill Freeman

You were saying that was what Herb's number is. Herb's number is 1.54. A

Cozy is side by side

with more frontal area so it has a higher number.

Paul Lamar

Not true.   Cozys perform essentially identically to a Long EZ, perhaps 5%
difference, primarily weight difference as most are heavier..

Bill Freeman

 From the data I have and the data Don Bates
has we both say the flat plate drag number for a Cozy is about 2.1.
>From how fast Herb said his went his EFPA is 1.54.

Now why would two airplanes, almost identical, except for the fact
that one has almost twice the frontal area have the same equavalent 
flat plate area? What then would be the point to a tandem seat
airplane?

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org