Scotty,
You might want to try tufting the bottom rear half of the wing.  This
can be an area of separation on NLF airfoils at low AOA (high speed).
It is just a little harder to film the results.
Chris Zavatson

>>> WarbirdAeroPress@cox.net 10/27/04 08:21AM >>>
Hi gang,

Well, being a future air racer, I thought I would be a good
experimenter and find out how the airflow acted over the top of my wing
at different airspeeds. I dutifully tufted a section of the top left
wing with cotton tufts and launched with a video camera.

Boy, was I disappointed! I thought I would see some detached flow as
airspeed increased. I went up to 260 mph indicated and *nothing.* The
flow never become detached along the length of the tufts chordwise. So
much for placing turbulator tape for some extra speed, huh?

Well, I might be missing something, so I thought I would include a
photo and see if you guys had any input. I plan on doing it again with
tufting near the wing root and maybe another section at the tip.

Just FYI, I had to slow to about 100 mph, bank over and approach an
accelerated stall to see any effect on the tufts... Only the last two
rows showed any disturbed airflow. Even at 100 mph indicated and full
flaps, all of the tufts were smooth and undisturbed.




Scotty G
Dago Red Unlimited Air Race Team
Unleashed Sport Class Air Race Team
WarbirdAeroPress.com

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