Hello Mike, hello all! Sorry guys, I should have provided some background information to prevent a lot of unnecessary e-mail correspondence.
Terry was trying to impress air show crowd by demonstrating the strength and flexibility of a modern glider wing. He simply cycled the flap lever very rapidly several times and in quick succession. By doing so he deliberately induced a wing flex that is well within the capabilities of the aircraft. In other words, NO FLUTTER AT ALL! Once again, please accept my appology for failing to explain this in the first place. Kind regards to all! Bernard ----- Original Message ----- From: "Discussion of issues relating to Soaring in Australia." @lists.internode.on.net> To:"Discussion of issues relating to Soaring in Australia." Cc: Sent:Wed, 04 May 2011 18:46:42 +1000 Subject:Re: [Aus-soaring] Re NZ ASH on youtube. At 05:50 PM 4/05/2011, you wrote: >Well Aerodynamicists, is it really fluttering after the anhederal? >Peter Heath - It looks like he had landing flap deployed then went to negative. In the Schleicher gliders the landing flap transfers the lift to the inner part of the wing and the tips then hang down or at higher speeds could even lift downwards, hence the anhedral. Sure looks like flutter to me, initiated by the impulse of moving the lift outboard suddenly. This probably isn't a test condition that the designer envisaged. Fortunately the flutter was damped and ceased after a few oscillations. Mike Borgelt Instruments - manufacturers of quality soaring instruments since 1978 phone Int'l + 61 746 355784 fax Int'l + 61 746 358796 cellphone Int'l + 61 428 355784 email: [email protected] [1] website: www.borgeltinstruments.com [2] _______________________________________________ Aus-soaring mailing list [email protected] [3] To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring [4] @lists.internode.on.net> Links: ------ [1] mailto:[email protected] [2] http://www.borgeltinstruments.com [3] mailto:[email protected] [4] http://lists.internode.on.net/mailman/listinfo/aus-soaring
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