And according to BGA winching in the UK is 7 times more dangerous than aerotow - from memory that's 7 times as many deaths as from aero towing. Michael
-----Original Message----- From: aus-soaring-boun...@lists.internode.on.net [mailto:aus-soaring-boun...@lists.internode.on.net] On Behalf Of Mike Borgelt Sent: Friday, 28 May 2010 2:22 PM To: Discussion of issues relating to Soaring in Australia. Subject: Re: [Aus-soaring] Wing Signals At 01:29 PM 28/05/2010, you wrote: >Thanks Michael, particularly with respect to the speed and lowering >the nose. If only ever this lesson was learned, then >accidents/incidents would drop dramatically. > >At Harry's suggestion I cruised the BGA Safe Winch Site and looked >at the simulations ><http://www.gliding.co.uk/bgainfo/safety/winch-safety.htm>http://www.glidin g.co.uk/bgainfo/safety/winch-safety.htm > >I don't know about the flick roll, but the spin and wing drop would >definitely feature in our accident stats. > >Dave Stalling has nothing to do with speed and everything to do with angle of attack which is controlled by the pilot by where he puts the stick in the fore and aft sense. When that sinks in to everyone including instructors we might get somewhere. Next time you are at a safe altitude while local soaring get yourself a little extra speed, nose up and when stabilised at 45 degrees nose up hold the stick in that position and see what happens. Report back on your findings. You won't stall. The glider may go over the top of the parabola at lower than the 1g stalling speed but won't stall unless you pull the stick back. It takes very little time to go from a non stalling AoA to a stalled AoA as the glider doesn't have a high moment of inertia about the spanwise axis and the elevator control is usually quite powerful. Having the trim jump out of the full forward detent to full aft or close to it while holding back pressure on the stick will probably do nicely to initiate a flick roll, particularly for the inexperienced. My personal opinion on winching is that it is a cheap and nasty way to get airborne with emphasis on the nasty. The only reason it is tolerated is because it is cheap. 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: mborg...@borgeltinstruments.com website: www.borgeltinstruments.com _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
