- Mar 24, 2020 at 11:47 pm #3637671Christopher VMember
To save weight, I’m considering replacing my Easton Syclone poles in my MSR Hubba NX and Hubba Hubba NX tents with Easton’s 3.9 or 6.3 Custom Carbon Fiber tent pole sections. I saw some posts back in 2011 about the durability of carbon fiber poles (not good if they have to bend). Has any of that changed in the past 9 years? It would save me 5.5 oz. on my Hubba NX and 7 ounces on my Hubba Hubba NX. Thanks!Mar 25, 2020 at 3:26 pm #3637756
CF poles can replace STRAIGHT Al poles without trouble.
But if the Al pole has a prebend, a curved section in the middle when not in use, it becomes a bit doubtful.
CheersMar 26, 2020 at 6:59 pm #3637953Eric BlumensaadtMember
@danepackerLocale: Mojave Desert
CF poles are very rigid and strong on compression. Side pressure – now so much.
I have had SWIX CF ski poles for XC racing since 1981 and they are SOoooo nice and weightless.Mar 27, 2020 at 12:09 am #3637991Sam FarringtonMember
@scfhomeLocale: Chocorua NH, USA
The latest heavier Easton carbon pole should work as a replacement for the Easton 340 alloy pole, but maybe not for the DAC poles used by MSR. I would order from Quest one section without ferrule, and one ferrule separately for both the heavier and the lighter Easton carbon poles. And see if they can be mated in any way to the hubs on the tents you have. But I’d be careful of using a drill to bore any tubing projecting from the hubs. The boring would weaken the temper, scar the alloy, and make the hub much weaker.
And there is another rub. I haven’t met the new Hubbas, but the original Hubba that I modified used one hub on each side of the tent. (hence the name, “Hubba”). MSR may have modified the hubs, but the old ones overlapped the poles only a short distance. Fibraplex sold hubs with the same issue. Unfortunately, carbon poles need a lot of overlap so that that break pressures is spread over a longer portion of the pole tube. The length of this portion is 1.5″ for the Easton ferrules, so the overlap on the hubs should be at least that, with the hub having projections that either stick at least 1.5″ into the pole tube, or over the pole tube. All this is because carbon tube is at its weakest when break or crush pressure is applied to shorter lengths. This is the reason that the original MSR carbon pole version of the Hubba did not use hubs for spreader poles, and the corners had to be staked individually; something you might do anyway, but some insist that at least the main portion of the tent be ‘freestanding.’
Note that the lighter Easton carbon poles have less spine, or more flex, than the heavier ones, and would not produce as rigid and stable a tent as the alloy or heavier carbon, the latter being a little over 30% heavier than the lighter carbon, but still well under the weight of the Easton alloy tubes.
If the carbon tube can be shimmed or otherwise made to fit over projections from the hubs on your tents, there are very light rings that fit over the end of the carbon tube called ‘nock collars’ that protect against arrow points from splitting carbon arrow shafts. They come in a multitude of sizes from several manufacturers, so I was able to find one size that fits the carbon shafts I use tightly – no need for bonding. Roger Caffin, bless his soul, turned his on a metal lathe; but the nock collars are lighter and less work. Don’t think you need the collars at the end of each pole section, but where the tube goes into or onto the hub is an area of much greater stress for reasons I can see intuitively, but am not an engineer, so cannot explain scientifically.
The new Easton carbon poles are about the only ones I haven’t break tested. It was costing money, and did not want to go with the heavier Easton carbons when there were arrow shafts that had almost as much spine, but were ~30% lighter. Yes, confess that I’m a gram weenie, but hopefully recovering a bit.Mar 27, 2020 at 12:24 am #3637994
I have seen two cases of CF poles broken at the end over an SS insert, but in case the break was due to someone standing on the pole at the joint by mistake. The 2D wrap stuff (many arrows) is remarkably strong.
CheersMar 27, 2020 at 2:10 am #3638000Sam FarringtonMember
@scfhomeLocale: Chocorua NH, USA
I’m not sure that the alloy inserts, or ferrules, that Easton uses for carbon poles are the best idea. The expansion and contraction characteristics of the two materials are different. Standing on a carbon pole at a joint sounds like asking for trouble.
Fortunately, I found another carbon shaft from Easton, the Injexion, that is strong and comes in a size that fits snugly into multi-layer Gold Tip Expedition Hunter 75/95 shafts used for poles. So the Injexion shafts are cut up, and the ends buffed and sealed with Bondini glue to make into inserts, and I’ve had no breakages. Other cyanoacrylic glues tried as a sealer did not work nearly as well, though.Mar 27, 2020 at 3:33 am #3638005
The expansion and contraction characteristics of the two materials are different.
Absolutely! Easton did try with some hybrid poles: Al core with CF wrap. Great in the lab, OK in the summer, disaster in the winter. The Al shrank more than the CF in the cold, and the lot delaminated.
Standing on a carbon pole at a joint sounds like asking for trouble.
It did ask.
The owner was very apologetic when he asked for replacements.
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