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On Sunday, April 29, 2018 at 3:30:06 AM UTC-6, Paul T wrote:
At 20:43 28 April 2018, Chris Rowland wrote: I did most of my ab initio training and learning to be an instructor o autotow. I'd suggest avoiding reverse pulley because it's difficult for both the to car driver and pilot to know when to finish the launch. With straigh autotow it's easy, stop sufficiently before the end of the runway that yo can drive forward and lay the cable out. Another issue is cross winds. The cable will drift downwind and looking a Ronan on Google Earth there are fields with irrigation equipment there. Th farmers will take a dim view of the launch cable being dragged throug their irrigation kit. Chris Don't see what the problem is at all with reverse pulley - had many launches that way - the other end of the runway is just as easily visible to the tow car driver and as speed decays the glider pilot pulls off - think you creating an issue where none exists. If you have a straight reverse pulley system and set it up properly, with removable strops t both ends the cable is waiting for the next glider, the car drives back and connects to the other end of the cable and your ready to launch again. Some reverse pulley systems where just way over the top -KISS is the answer. Doubt these guys will be doing hundreds of launches a day. Crosswinds are something every ground launching site has to contend with and 1000's of sites around the world seem to manage ok with proper training - seem to remember the advice was to have at least 80m width of clear land to launch from. http://coloradosoaring.org/thinking_...ey/default.htm I've had a couple of chats with John Foster. There are raised runway lights. Reverse pulley allows a lot more control of the line than direct auto tow, so could be an option. Today, UHMWPE ropes, spectra, dyneema, or polyolefin drag line might work for reverse pulley, though I'm unaware of an operation doing so. Frank Whiteley |
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