You can fly for long times cross country by using thermals. Who knew?
http://phys.org/news/2016-07-great-frigate-birds-months.html
Surprising they say the birds fly INSIDE clouds using the thermals.
They aren't meant to be able to do this I thought. (See Philip Wills
- Where No Birds Fly)
Mike
Borgelt Instruments - design & manufacture of quality soaring
instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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