|May 22, 2014, 12:26 PM|
|May 23, 2014, 01:47 PM|
The Willamette Valley, Oregon
Joined Dec 2008
0) "Briefing 3" posted above is completely on target so far as I can see...
1) 2 weekends ago flying a full-scale a/c within 1000' of hilly terrain there were times while thermalling where I had to straighten out and drive upwind every single time I reached the pointing-upwind leg of my circle, if I wanted to stay centered in the lift. Not terribly surprising considering some previous somewhat similar experiences-- see previous posts. In no way suggests that an aircraft circling in a uniform airmass "feels" the wind in any way.
2) Have you noticed that soaring birds usually point into the wind? I.e. that they spend much more time pointing partly into the wind than pointing partly away from the wind? There is an easy explanation for this that in no way suggests the birds are "feeling" the wind.
3) Wind gradient is hugely important very near the ground. Even when my hang glider is folded up in its long narrow bag on my shoulder, I can make it yaw one way or the other by tilting it so the one end is up high in the faster air and the other end is down low in the slower air. I use this phenomenon to help me control the glider every time I am carrying it folded up in the bag in very strong wind. Similarly, standing with the wing unfolded, no matter whether the nose is pointing into the wind or yawed to one side, if one wingtip is much higher than the other wingtip, the high wingtip will tend to rise, because it is in faster air.
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