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Jun
20
comment Travelling and taking climbing chalk through customs
It appears that the subject of taking another innocuous powder on a plane has been discussed numerous times on numerous websites: savedwebhistory.org/k/whey-protein-on-plane I don't plan to read all that and summarize it, but I expect everything you could hope to find can be found by searching on those keywords.
Jun
19
comment How high to climb before clipping on a sport climb?
@AM_Hawk Yes, but those figures are elongation during the severe UIAA test drop with a rigid 80kg mass and a 1.78 fall factor. I don't have data for elongation at lower factors; do you?
Jun
18
comment “Used” top rope when bouldering
I removed the addendum to my answer because I could not support that position and because I think your answer now better addresses rope wear. For the time being I shall assume that the gym rope wear I observed is explained by: This seems to agree with Johnson and Klonowski's finding that dirt and sand can significantly reduce the strength of a rope.
Jun
18
comment Wood versus plastic trail signs?
@Olin Is that data available as a KML/KMZ file?
Jun
18
comment Wood versus plastic trail signs?
@Olin Yet another one in the MHNF, also with dark lettering. If the bolts are any indicator it might be somewhat older.
Jun
18
comment Wood versus plastic trail signs?
@Olin That sign is ostensibly on a trail in the Mt. Hood National Forest, but one I've never visited. Here is another sign that appears to be of the same type. Perhaps I can ask one of the rangers in that area how old those signs are, next time I'm out that way.
Jun
17
comment How should I remove a tick?
On Amazon.com there is a harsh review of this product: "We have tried a number of times to remove adult deer ticks from people (ourselves) with no success. The TickKey just slides right over the tick. It will remove a tick that has fed on a dog. This was advertised as being able to remove deer ticks, in our experence(sic), IT DOES NOT WORK." There are other reviews which state that it does not work on small ticks. If you have to wait for the tick to swell up with blood before it works that's not good. What is your experience? What is the specific species of tick in your area?
Jun
17
comment Wood versus plastic trail signs?
@Olin What do you make of the construction of this sign? It looks like bleached wood but the lettering is dark and clear. I suppose it could have been made of bleached wood to begin with, but if it weathered into that state and remains that legible it impresses me. Does the lettering look burned on to you?
Jun
17
comment Wood versus plastic trail signs?
@OlinLathrop You're welcome. I was afraid that there might be a durability problem with paint; perhaps that style could be emulated in composite however. None of these are my own pictures, and frankly I don't spend a lot of time looking at signs, but if the Bell Creek sign is composite it's a departure from the standard around here. However since it appears to be new in the picture that is possible.
Jun
17
comment Wood versus plastic trail signs?
@gerrit I do see the advantage in that, but at the same time I don't like it. I prefer an area to have its own local flavor: ideally style with flair yet which blends with the surroundings, a la Frank Lloyd Wright; not ugly uniformity, a la McDonalds.
Jun
17
comment Wood versus plastic trail signs?
@gerrit I would hate to see signs like that on the trails around here. Sorry, but yes they are ugly.
Jun
17
comment Wood versus plastic trail signs?
I don't believe there is a signage tag; rather I'm suggesting that it will be more general and therefore useful (in combination with other tags) than trail-signs. Since you don't object I shall retag, but ultimately it's up to the moderators to decide. Also, don't worry about the picture; I'll add some myself (in an answer) with my own thoughts on the matter.
Jun
17
comment Wood versus plastic trail signs?
I'd like to retag this with trails and signage following this logic. Do you object?
Jun
17
comment Wood versus plastic trail signs?
Interesting question. Do you happen to have a picture of one of the plastic signs?
Jun
17
comment “Used” top rope when bouldering
Thanks for the reference. You've got my +1.
Jun
16
comment “Used” top rope when bouldering
Seeing rope worn out from repeated short falls, without apparent extreme abrasion, leads me to think that due to the concentration of load in a bent rope (the purpose of my including the second quote) does in fact push some fibers past an elastic limit and slowly degrade the rope. I'm certainly not claiming to be an expert on this and I'd love to know if you have other information or theories.
Jun
16
comment “Used” top rope when bouldering
@BenCrowell Okay, that's a valid criticism and I appreciate you taking the time to make it. Could you provide a link to Aging Rope? I know that nylon does very well in flex cycle testing, losing very little strength over thousands of cycles (unlike aramids), and I also know that load cycling (presumably below the elastic limit) without a bend also has little apparent affect on strength. Nevertheless the ropes do wear out. Do you assert that it is entirely a matter of abrasion? Direct infiltration? (continued)
Jun
16
comment Does “Cow Tipping” hurt the cow?
Cow tipping doesn't actually exist. It's a joke.
Jun
16
comment “Used” top rope when bouldering
@BenCrowell Please see my addendum. I mean you no disrespect, but as stated there I believe the subject matter warrants fastidious scrutiny.
Jun
16
comment When should I retire my rope
@BenCrowell I agree with (my understanding of) what you wrote. All I meant to communicate is that a short factor-1 fall puts (almost*) as much stress on the rope as a long factor-1 fall, just over a shorter area, which I think is what you just said, but more clearly. (* Almost, because there are common energy absorbing elements in the system besides the rope that do not change with the length of fall, therefore a very short factor-2 fall will not reach as high a peak force as a full-rope-length factor-2 fall, even momentarily, and the impulse is much longer as well.)