Like an anchoring
Cut by accident
. Yes, Dyneema can chafe and be cut, but not that easily. In fact, all of the failures I know of have been caused by racing-specific miss-use (hanging rail meat, chewing up the stanchions first with bare wire, jibe on a big boat). But that is it's own thread.
Tripping hazard. Since you can only trip if your foot is past the edge of the deck
, and the lines are on the edge, if you tripped I think you were going anyway. Furthermore, if you were standing tall going forward, that is your mistake.
Never touch them. I use them all the time for balance, and I have never had a leak or wear, but I use them in a very specific way. I pull up, often with a jackline in the other hand, to help keep my feet on the deck. Perhaps this is a multihull
thing, since they buck vertically but do not lean. I do not pull to the side.
. I have yet to read of a sailor falling off to windward. Possible, but if you are keeping low, you are going to fall to leeward. As racing history
supports and Evan has discussed, sailors don't fall when they are moving and focused on moving, they fall when they are working and not holding on. Thus, point of use tethers make sense and the hope for a one-size-fits-all solution is in vain, I believe.
Get low. I do a lot of scooting, sitting, and crouching.
Save my bacon. It's hard to say, because I behave differently knowing they are there. Certainly, I have allowed my tether to catch me many times. Often I lean on it, as a 3rd leg. I've never had a close call (other than docking!) that would have been different without a tether... because I would have been moving differently.
Strength of lifelines. The stanchions are primarily to hold the spacing, like a net. The strength comes from the end fittings. If they are too weak, try to pull them off. Good luck.
Spacing. It is possible to slide under. I know of several cases where sailors went under because they had removed the middle wire. Stupid. Honestly, I would rather see a good toe rail requirement. That is what I always want on the bow.
Too small to hold. I always wear gloves in bouncy weather
when going forward, specifically so that I can really yard on a stay or cable if thrown without injury. Always. With gloves, you can latch onto pretty much anything. It is a safety
matter, like wearing PFD
Stretch. The article I wrote of Practical Sailor discussed stretch, strength, and that one material and specification probably cannot serve all boats. A smaller boat benefits from more stretch and needs less strength. A bigger boat--over 40'--probably needs less stretch and greater strength than polyester lines afford. The use of climbing webbing for jacklines bothers me, not because it will break, but because it is too stretchy. The use of Amsteel requires increase engineering (easily done).
As for the British posters, jibe is spelled gybe and crabs are made from aluminium on YBW.com. I'm OK with that, and I change my spellings there. Standard American English
is the international standard, judging from ISO etc. As for silly or vague figures of speech, both dialects are a mess, without considering the more ghastly regional variations. They're both fun to misuse!