"sidk" wrote in message om...
Here is a link to a photo from last month's tuft-testing on my
Velocity with hopes that some clue would appear as to why my engine
cooling is worse than marginal. Tape was duct tape and some was on
for several months (waiting for weather, photographer, digital camera,
photoplane, etc...) and was a pain-in-the-butt to remove.
For the test, the left (pilot) side NACA has two VGs, the right side
none.

http://img35.exs.cx/img35/5182/HPIM0430.jpg

Sid Knox

Velocity N199RS
Starduster N666SK
KR2 N24TC
W7QJQ

http://img35.exs.cx/img35/5182/HPIM0430.jpg

"keepitrunning" wrote in message . com...
I was reading and saw a picture of a wing being tuft tested. I was
wondering, since I do not have a clue, how much difference the tape holding
the tufts would cause. In the picture it appears that 1/2 inch blue masking
tape was used and it was torn rather than cut. The tufts were spaced a
couple of inches apart and there were seven rows and eight columns. His
results were that the wing was not showing any separation. Just wondering
if there are accepted methods of doing this type of testing? How would you
determine where to test? Any discussion and comments would be appreciated.

Interesting to see the left side duct is pulling air forward and in around the center of the of the back lip of the
duct. Am I seeing that right? Are the two vortex generators causing it?