Originally Posted by Kickstart
Then can you explain this quote...
"Anytime you turn downwind, your model has to accelerate (relative to earth) in order to catch up with the river of air and regain a comfortable airspeed. This acceleration costs you some altitude, and while it's happening the rudder is going to be sluggish, since it too is short on airspeed."
Dave Thornburg, Old Buzzards soaring book.
He's just flat-out wrong, that's all there is to it.
Now mind you, if you moved to a region with a different wind speed or direction (vertical included) you could see what looked just like what he describes.