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Trekking Poles for ‘Mid Support

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PostedAug 13, 2009 at 1:09 pm

Brett asked about trekking pole connectors.

Josh mentioned combining AGP poles by placing the bottom of one pole into the top of the other.

This reminded me to do some simple tests.

On a recent evening in the Wind River Range I measured 36 mph gusts outside my DuoMid. That was before the front hit. I don't know what the max got to, I didn't want to go out into the sleet, but the DuoMid and my AGPs were really dancing.

It made me wonder how much force is coming down through the pole. So today I set up the 'Mid, placed the pole on a bathroom scale, and tried to keep things plumb with a weighted string.

I set up like I usually do, used Joshes' suggestion, set the poles to 56", noted that the scale read 20#, and took Photo #1.

Pole Deflection 1

Then I leaned on the Mid a bit, not much, watched the deflection of the pole, and noted the scale read 40#. I believe the deflections I experienced in the Winds were much more than I applied today.

I re-set the tension on the Mid to match the 40# and took photo #2.

Pole Deflection 2

Note the deflection.

In the Winds I actually added my second pole for support just because things were getting a little wild and I was getting a little nervous.

I don't know what any of this Really means, but it does make me think about the limits of trekking poles in large shelters and the consequences of pole failure.

Anyone want to test to destruction?

PostedAug 13, 2009 at 1:24 pm

I had the same worries.
I tried using my TiGoat poles in my Hex and my Duomid. The bend in the poles scared me so much i couldn't relax.
I now use my alu BD poles and don't worry any more.
I know carbon poles are stronger than they look, but when they do let go, they do it big style!

PostedAug 13, 2009 at 3:17 pm

Someone I know used an older Black Diamond Pyramid (megamid?) on Mt. Rainier, using the BD tent pole (probably a 1" to 1.5" diameter AL). I think they ended up strapping ice axes and trekking poles to the tent pole to keep it from bending/breaking in a storm.

Forces on the pole are probably the main reason for limiting the height of the pyramid when used in windy conditions (or bring a larger, heavier pole). In forests you can sometimes find a dead branch to use. Or, tie the peak to an overhanging branch and hope it doesn't break in a storm.

There's some good discussion at:
http://www.backpackinglight.com/cgi-bin/backpackinglight/xdpy/forum_thread/3893/index.html

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