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#11
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After getting the bug again, I turned up this really nicely engineered pay-in static tow setup. Ignore the 1500N rating listed, the sailplane version has a much thicker side wall. It's rated to 1500lb tension. A follow up e-mail suggests a tost release can be used for a quick release, and the auto-level kicks in for the electric motor powered retrieve. http://www.tow-systems.com/en_vijesti.php It is NOT cheap though! Chris Gary Boggs wrote: Bill, this is a payout winch. The starter motor is for reeling the line back in after the truck mounted winch gets to the end of the runway. Check out the video: http://www.nwskysports.com/ "Bill Daniels" wrote in message news:QIV6d.147361$D%.8795@attbi_s51... "Gary Boggs" wrote in message ... My guess as to the force on line is probably something like 300lbs? I think the next mod we will incorporate will be a tensiometer on the line. Right now we use a pressure gauge on the brake line and as the disc brake heats up, the pressure required to get the correct tension on the line goes up. It would work much better if our winch operator was able to monitor the actual tension on the line, instead of the pressure on the brake. If we could find an electronic tensiometer, we could program it to operate the brake, but this would make the winch even more complicated and expensive. I've searched the web for available tensiometers, but found nothing suitable, so I think we will just build one into our system. The tension on the line should be about the same as the gross weight of the glider. 300 pounds will result in a poor launch. The tension on the line is the result of cooperation between the pilot and the winch operator. No matter how hard the winch tries to increase the line tension it won't happen unless the glider pilot pulls up. A better idea is to use an RC model airplane telemetry package like RCAT to send the glider airspeed to the winch operator and let him control that. The glider pilot can then control the line tension with the elevator. I think it will require more power than a starter motor for that though. Bill Daniels |
#12
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Hello,
We are doing glider launches with a car and the altitude you are getting is about the same with a static line. We can use 1/3th of runway lenght of rope and need 2/3 for getting the max height which is almost the 1/3th!(0 wind condition) The real out system is much safer if you could provide feedback to the tension of the drum with a pre selected force. And there is also less wear and tear of the dyneema (only small part is in contact with the surface) If you could develop a system we are very interested. What if you contact the winch docter http://www.monkeytumble.com/winchdoc/winch.htm he lives in your area but doesnot react on my emails.... greetings, JP |
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