Topic

shelter center pole

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Viewing 14 posts - 1 through 14 (of 14 total)
Bob Gross BPL Member
PostedNov 8, 2014 at 7:56 pm

We know that there are several good solo pyramid type shelters from the cottage manufacturers. Many of these require a center pole that is 48" in length. I don't normally use any trekking poles, so I normally purchase a segmented carbon fiber center pole for that correct length.

For short poles, like 30-40", a carbon fiber diameter of slightly less than 0.3" works. For very tall poles, like 54-60", a carbon fiber diameter of 0.45" or more will work. However, for a length like 48", it would work best for some diameter between 0.3 and 0.45". Obviously, the bigger the diameter, the more they weigh. OTOH, the smaller the diameter, the more likely that I could snap one if the shelter were hit by a bad wind or if it had been erected at a cocked angle.

I've had a carbon fiber pole crunched before, but only due to crunching by an airport baggage handler while inside a duffle bag.

So, for a pole length of 48", what do we think about the optimum pole diameter? I know that there are not very many choices on the market.

–B.G.–

Jerry Adams BPL Member
PostedNov 9, 2014 at 7:36 am

I have 60 inch center pole. That provides enough to move around a little and not contact inside of tent and maybe get condensation on me. The peak of tent is narrow so that space isn't really usable.

I use Easton poles. 3 sections. 0.49 inch – but it bends some when it's windy. Probably too thin for most people. 4.5 ounces.

Sometimes I use 0.625. Overly strong. At least for non mountaineering. 7.5 ounces. I use these sometimes if it's going to be really windy or if I'm car camping.

PostedNov 9, 2014 at 8:24 am

Bob,

Experimenting can be inexpensive if you buy the tubing here. I’ve used various sizes of the wrapped spars for both backpacks and tents. You could also see if beefing up the middle section of the pole gives you enough stiffness without making the entire pole larger. Thinner walled spars are more fragile than the thicker walled ones.

I’ve used two 48″ long poles made of the .380 spars for several years (see avatar). They’ve worked fine. Don’t know how this translates to your pointy topped single pole needs, however.

here

Edit: I’m assuming some interest in DIY/MYOG experimenting. Raw materials are available here….not finished poles. Most Skyshark tubes are 32.5 inches long unless otherwise noted.

Bob Gross BPL Member
PostedNov 9, 2014 at 8:28 am

The Sky Shark site isn't very helpful. The diameters are discussed, but there is no mention of length, so forget that one.

–B.G.–

Bob Gross BPL Member
PostedNov 9, 2014 at 8:44 am

"They are 32.5"

It doesn't say that.

32.5 feet long is remarkable. Too long.

32.5 inches long is too short.

32.5 centimeters long is too metric.

–B.G.–

PostedNov 9, 2014 at 8:54 am

Bob,

I think my use of quotation marks is confusing things. Maybe this will help. I've added some ……. to show where length is given (from the link):

"SKY SHARK .380/.414

SKU SS380

The New Sky Shark .380 and .414 wrapped carbon tube have a diamond pattern. …… They are 32.5". …….. The.380 has an I.D. of .349 and weighs 14.5 grams. The stiffness is comparable to a p300. The .414 has an I.D. of .385, the weight is 16 grams and the stiffness is comparable to a p400. The .380 has a spine deflection of 0.361". The .414 has a spine deflection of 0.290". Ferrules are available. These are great tubes for kites of all kinds and hobby applications."

Bob Gross BPL Member
PostedNov 9, 2014 at 8:59 am

Again, there is no length or unit of length mentioned, so this is meaningless.

–B.G.–

Bob Gross BPL Member
PostedNov 9, 2014 at 9:11 am

I was looking for a 48 inch segmented pole, and this vendor doesn't seem to offer that.

–B.G.–

PostedNov 9, 2014 at 9:28 am

Bob,

"Again, there is no length or unit of length mentioned, so this is meaningless."

Hmmmm, can't figure this one out. Wondering if we might be seeing different things when we go to the site?

32.5" = 32.5 inches in my book (i.e. " = inches)

Here's part of what I found when I searched the subject of abbreviations for inches:
Foot and inch marks
Foot and inch marks— also known as minute and second marks, or prime and double prime marks
She’s 6' 10".

Guess it doesn't matter because you aren't interested in myog poles as an experiment. It is puzzling, however. Must be some simple explanation for our confusion over the length of the Skyshark spars? Any idea what's going on here? I'm out of ideas.

PostedNov 9, 2014 at 9:31 am

"I was looking for a 48 inch segmented pole, and this vendor doesn't seem to offer that."

Correct.

This site would only be useful if you wanted to experiment with myog poles to see what size best fits your needs. Raw materials only. No finished, segmented poles.

Bob Gross BPL Member
PostedNov 9, 2014 at 9:47 am

Yes, I am not looking for a spar, and I am not looking for 32.5 of anything. I don't want to experiment, and I don't want to buy raw materials.

Segmented carbon fiber tent poles only work right when they are perfectly fitted with ferrules. Otherwise, they wobble around and are more susceptible to breakage on the ends. Segmented tent poles are designed to withstand forces along the length of the pole.

–B.G.–

Bob Moulder BPL Member
PostedNov 9, 2014 at 5:36 pm

Looks as if finding exactly what you want right off the shelf might not happen.

If you have to MYO here is a good source: http://www.acpsales.com/Carbon-Tubes.html

If I were looking for such a thing I could imagine buying a CF tube and some proper OD aluminum tubes to use as ferrules, glued in with hysol and shock-corded.

Wouldn't be a huge amount of work or expense for just one pole.

PS looked at the Ruta Locura poles per Nick's post above… What's wrong with those?

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