On Sunday, 7 October 2012 07:38:04 UTC+13, Martin Gregorie wrote:
On Sat, 06 Oct 2012 10:59:58 -0700, son_of_flubber wrote:

What are the G forces in unintentional aerobatic maneuvers... say flying
through extreme rotor?

Have there been cases of gliders losing their wings in rotor on their
way to mountain wave?

A Nimbus 4 broke up in severe turbulence during practice for the 1995
World Champs at Omarama, NZ:

http://aviation-safety.net/wikibase/wiki.php?id=29823

That glider was overspeed and in cloud, so not really a case of G induced failure.

I fly in the wave a lot, and used to fly a DG1000 with a G meter. The most I saw in rotor was around 4G positive and maybe 1.5G negative.

I do remember a ridge crossing that was particularly rough that got 5G positive and 2.5G negative once. That was very unpleasant.

--
Phil Plane