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#11
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Weak link - single or reserve?
Andreas,
I agree that would seem to be a problem for that location. But I have not seen it arise for the main winch rope. We do use a 15 metre length of stiffer and thicker rope after the main winch rope which also might help counteract that. The cost and wear properties on our grass strip, plus the almost complete lack of winch failures is a real plus. Even nicer is the handling side for the winch man. It's 100% safer and we get no cut fingers. A repair (splice) can be carried out in a few minutes with a pen knife and some tape to cover the 3 ends of the rope. The section closest to the winch suffers the most wear, but this is easily and quickly replaced and minimal cost.Also the guide rolls on the winch after about 8 months of use show zero wear. I drive the winch every few weeks and after the 18 months of so of usage I would hate to go back to steel. And as said before the amount of weak link failures is virtually nil now. Cheers, Malcolm... "Andreas Maurer" wrote in message ... On Fri, 18 Jan 2008 16:16:22 GMT, "Malcolm Austin" wrote: At our club (Denbigh GC, UK) we changed the steel wire for a type of polypropylene rope. The shock absorbing properties of this have reduced the incidence of weak link breaks to almost zero. I know of a club that also used a polypropylene rope between aircraft and weak link. They stopped using that after this rope got entangled within the gear of an ASK-21, leading to a severe ground loop immediately prior to lift-off. The stiffness of the steel wire prevents such an event. Bye Andreas |
#12
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Weak link - single or reserve?
At 15:48 18 January 2008, Andreas Maurer wrote:
- weak links that impact tarmac after release are more prone to fail Install weak links within an equivalent length of narrow steel channel (with a hole at one end and a slot at the other) as protection from wear/impact damage. |
#13
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Weak link - single or reserve?
On Jan 18, 5:04*pm, Andreas Maurer wrote:
On Fri, 18 Jan 2008 16:16:22 GMT, "Malcolm Austin" wrote: At our club (Denbigh GC, UK) *we changed the steel wire for a type of polypropylene rope. *The shock absorbing properties of this have reduced the incidence of weak link breaks to almost zero. I know of a club that also used a polypropylene rope between aircraft and weak link. They stopped using that after this rope got entangled within the gear of an ASK-21, leading to a severe ground loop immediately prior to lift-off. The stiffness of the steel wire prevents such an event. That's partly why the strops our weak links are attached are inside some kind of plastic tube. I have a feeling the BGA recommends this but I can never find stuff on their website, so don't know if I'm imagining that. |
#14
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Weak link - single or reserve?
On Fri, 18 Jan 2008 16:13:36 -0800 (PST), Cats
wrote: That's partly why the strops our weak links are attached are inside some kind of plastic tube. I have a feeling the BGA recommends this but I can never find stuff on their website, so don't know if I'm imagining that. If you need some written arguments: The German SBO explicitly demands a stiffened rope between glider and weak link. See here (if you speak German): http://www.daec.de/se/downfiles/sbo.pdf Bye Andreas |
#15
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Weak link - single or reserve?
On 19 Jan, 00:13, Cats wrote:
That's partly why the strops our weak links are attached are inside some kind of plastic tube. I have a feeling the BGA recommends this but I can never find stuff on their website, so don't know if I'm imagining that. http://www.gliding.co.uk/forms/clubm...t/winchops.pdf and http://www.gliding.co.uk/bgainfo/doc...chguidance.pdf Finding stuff on the site is a pain, especially since the search facility is useless! Ian M |
#16
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Weak link - single or reserve?
On Jan 19, 3:46*am, nimbusgb wrote:
On 19 Jan, 00:13, Cats wrote: That's partly why the strops our weak links are attached are inside some kind of plastic tube. *I have a feeling the BGA recommends this but I can never find stuff on their website, so don't know if I'm imagining that. http://www.gliding.co.uk/forms/clubm...t/winchops.pdf andhttp://www.gliding.co.uk/bgainfo/documents/safewinchguidance.pdf Finding stuff on the site is a pain, especially since the search facility is useless! Thanks. I knew it was in there somewhere! |
#17
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Weak link - single or reserve?
At 00:18 19 January 2008, Cats wrote:
The stiffness of the steel wire prevents such an event. That's partly why the strops our weak links are attached are inside some kind of plastic tube. I have a feeling the BGA recommends this but I can never find stuff on their website, so don't know if I'm imagining that. From the BGA website http://www.gliding.co.uk/forms/lawsandrules.pdf Page 52, RP (Recommended Practice) 7 Gavin Std Cirrus, CNN now G-SCNN, #173 |
#18
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Weak link - single or reserve?
On 18 Jan, 23:23, Z Goudie
wrote: At 15:48 18 January 2008, Andreas Maurer wrote: - weak links that impact tarmac after release are more prone to fail Install weak links within an equivalent length of narrow steel channel (with a hole at one end and a slot at the other) as protection from wear/impact damage. I thought that was part of the standard Tost kit. Ian |
#19
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Weak link - single or reserve?
On Jan 18, 8:40*am, "Jesper Thomsen" wrote:
"Tom Nau" wrote in message ... Hi All, Our commercial operation (more like a club) is starting to do winch launches. *I just bought a Tost weak link for my glider from W&W. *Are most people using a "single" weak link or a "single and a reserve" weak link? * Thanks. Tom Nau In Denmark where winch launching is about 90% of all starts, we also used backup weak links for a while, but they've almost all disappeared again. Experience shows that the second weak link is not strong enough to stand up to the forces that appear when the primary weak link breaks (for whatever reason). The Net result is that you break two weak links instead of just one, and you don't get any added security or resilience for the price of the second weak link. Plus you add the unnecessary complexity of having to check that the two weak links are different and that either didn't break during the last launch, plus you're dragging two weak links through stones, dust, mud, grass etc. instead of just one. /J Thank you, everyone, for your input. Tom Nau San Antonio, Texas |
#20
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Weak link - single or reserve?
At 10:36 19 January 2008, Ian wrote:
I thought that was part of the standard Tost kit. Use a SERIOUS piece of steel channel! |
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