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#11
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A Rough Day Towing
I think the rope is 3/8 polypropylene. The rope strength is within FAA
requirements for the gliders we tow. We use a weak link with a tost ring, but not with the Schweizer. There's a Schweizer release on the tug. "GARY BOGGS" wrote in message ... What size rope were you using? Was there an weak link? Boggs |
#12
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A Rough Day Towing
I have been a bit concerned with the ropes some places use.
http://www.engineeringtoolbox.com/po...th-d_1516.html shows the following minimum breaking strength 1/4 1125 lbf 80%= 900 lb minimum glider weight 5/16 1710 lbf 80%= 1368 lb minimum glider weight 3/8 2430 lbf 80%= 1944 lb minimum glider weight I prefer towing behind 1/4" rope I have seen a few rope breaks with 1/4" all seemed warranted with a rope in good condition. It seem to me that unless you are towing a fully loaded ASG29 or a two place that 1/4 rope is probably what should be used unless of course a weak link is used. And even then 1/4" rope should be adequate at the 200% rating or less. Am I missing something? Brian |
#13
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A Rough Day Towing
Wear on the runway, UV degradation.
"Brian" wrote in message ... I have been a bit concerned with the ropes some places use. http://www.engineeringtoolbox.com/po...th-d_1516.html shows the following minimum breaking strength 1/4 1125 lbf 80%= 900 lb minimum glider weight 5/16 1710 lbf 80%= 1368 lb minimum glider weight 3/8 2430 lbf 80%= 1944 lb minimum glider weight I prefer towing behind 1/4" rope I have seen a few rope breaks with 1/4" all seemed warranted with a rope in good condition. It seem to me that unless you are towing a fully loaded ASG29 or a two place that 1/4 rope is probably what should be used unless of course a weak link is used. And even then 1/4" rope should be adequate at the 200% rating or less. Am I missing something? Brian |
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