Why is calm air necessary?
The
birds line up close to the ultralight's wing to get the benefit of
the air currents that flow from it. The lead bird may be just six
inches away! That means if wind makes the plane's wing bounce, rock
or jolt, the closest birds could be hurt. It's safest to wait for
calm air aloft.
Operation
Migration TrikeCam: October 8, 2010
