http://i614.photobucket.com/albums/t...psfc8f62de.jpg
I have read with interest the posts about using wing tufts and watching the airflow during stalls and spins. Attaching the yarn tufts is really simple with about 1 inch per tuft of the blue painter’s masking tape. Didn’t lose any of the tufts during the testing. I posted three video clips in http://www.youtube.com/user/willyeyeball/videos
The upright spin to the left gets all the yarn tufts dancing. I also did aggressive accelerated stalls in approximately an 80 degree bank at 110 knots, and it stalled with 3.5 Gs. The tufts looked exactly the same during the stall as the level flight stalls so I didn’t video record them. As previously discussed, the ailerons are still effective during the stalls. It was also interesting to watch the turbulence around the aileron and flap juncture.
Bill McLean
RV-4 Slider
Lower Alabama
Last edited by WillyEyeBall : 07-06-2014 at 04:23 PM.
http://i614.photobucket.com/albums/tt228/willymac104/yarntuftsleft_zpsfc8f62de.jpg[/IMG][/url]
. . . It was also interesting to watch the turbulence around the aileron and flap juncture.
Bill McLean
RV-4 Slider
Lower Alabama
Thanks for posting your work. Yes, is not what I would expected for flow over the aileron and the flaps too. Maybe the aerodynamicists will enlighten us.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Wing tufts- RV-4 stalls and spins
Very Neat!
Linear Mode
