ButterFly Avionics recieved full IGC Flight recorder approval 3/31/2013 for it ButterFly Vario recorder.

http://www.craggyaero.com/butterfly.htm

Youtube of ButterFly in action.

http://www.youtube.com/watch?v=1i0IVkHUnWU

Richard
www.craggyaero.com