wrote in message
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Coriolis effect: http://en.wikipedia.org/wiki/Coriolis_effect

And snapping smartly into left hand thermals keeps them tight. You
have been doing that I hope?



Finally an answer that makes sense! Thank you, thank you, thank you! For
years I've been wondering and now I know why. Once all my instruments fell
out when I snapped smartly into a right hand thermal - - had me baffled.

bumper