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Old February 19th 12, 11:50 PM posted to rec.aviation.soaring
John Firth
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Posts: 10
Default New Butterfly Vario

VG post by Andy Gough.
This debate has been going on since the '60s!
AH s and T and S had to be removed for constests outside
the UK ( and Yugoslavia etc) but then the Bohli compass appeared
which confused the issue.

I personally proved to myself that I could manage for a while
using a COOK compass, predecessor of the Bohli.
Cloud climb with only ASI and vario! Wow.
I would not try that in a modern ship.

The GPS record should take care of transgressions, but
wave either lee o thermal ,poses a problem.

John Firth