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On Thu, 30 Oct 2003 07:49:51 -0800, Eric Greenwell
wrote: In article , says... I still fail to understand why any winch or cabel failure should lead to an accident. With or without radio. With or without wind. With or without water ballast. Be prepared. I seem to recall some launches where the cable became tangled in the main wheel, when the winch jerked the glider forward, then paused very briefly. This is caused the glider to pitch up too fast at the start, and the pilot was unable to release, leading to a crash. Perhaps this is not what you mean by a winch failure? That should be a recoverable situation provided that the signalling channel between launch point and winch can convey three messages: - take up slack - all out - STOP If, as it appears to be the case at Torrey Pines, the headlamp signals can't be used to signal STOP then you have an accident waiting to happen. The launch marshal must ALWAYS be able to signal STOP and be obeyed without question. Doesn't matter whether the channel is radio, telephone, coded light flashes or signalling bat provided that it can transmit those three commands unambiguously. On the sites where I've winch launched an immediate STOP is signalled if the glider overruns the cable for any reason. The reason we use the three phrases listed above (repeated continuously) is that they have three, two and one syllable and so can be distinguished despite noise in the winch cab and/or wind noise in the launch marshall's microphone. -- martin@ : Martin Gregorie gregorie : Harlow, UK demon : co : Zappa fan & glider pilot uk : |
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