ORIGINAL: foofydoo
What causes wing rocking, I've been asked to put my C140 in the uni wind tunel when it is finsished to test stall flying. ANy other thing you think I could test.
Could be interesting
As for wing rock, when in an elevator or harrier, the wing is stalled. Therefore the airflow over the top of the wing is unstable, and I suspect the wing relies on high preasure under the wing (rather than low preasure over the wing) to generate lift.
I suspect that wing rock is caused by changes in the instability of the air over the top of the wing (if that makes any sense), perhaps partly unstalling itself to create extra lift.
If you are putting it in a wind tunnel, perhaps you can tell us what the answer is