Tail emits a tone when thermaling on several, like blowing over the
top of a beer bottle.

Frank, does your LAK have mylar seals for the rudder? I had a LAK once, =
and cured this with Streifeneder 'Kombi' tape.

We used to joke that the tail "moooed" to remind you to stay away from =
outlandings (vacada, aux vaches, K=FChe treffen.... sorry, it doesn't =
work in English).

Doug, there is an interesting thread about the LAK-12 at =
www.gliderforum.com.

Regards,