Thank you for the link. Unfortunately, did not see anything at Bergans much different from some designs used by Helsport and Hilleberg. But from some other posts from you and others, it appears clear that trekking poles, in conjunction with guy lines, can be used to reinforce the peaks on arches, greatly increasing their wind stability. Am working on a design now where the eave on the front of the tent is open and freestanding in normal weather (think of the old Eureka Crescent), but can be strengthened for high winds by using a trekking pole and guy at the front apex point of the eave. Of course, this cuts down on the ease of entry and exit, but any port in a storm, right?
I have fooled around with double crossing arches for years, and always found too many drawbacks. Only came up with one good design. It uses one arch, tilted back, and two poles coming up from the rear corners over the arch and to a point at the front, creating a vestibule like the Crescent's, and another arched ridge pole on the top running about three feet from the front point back to the arch to shed rain and snow. But the whole thing adds up to almost 29 feet of pole footage, which is too much for BPL. It is 2.5 pounds already in Epic, with a catenary sil nylon bathtub floor, and I still have not completed the sil nylon fly for the top, which adds about another square yard. Also, while there are some positive posts about Epic (the Black Diamond tents) on the web, the negative ones have led me to conclude with others that good quality sil nylon and good venting, especially at the head, foot and apex, are the answer for a single wall tent. So, I am focusing on two arc freestanding designs, like the one described in my earlier post, that do not require a strut to get headroom and to provide a vestibule over the entry, and with a maximum limit of 24 feet of pole footage. Hope to have some pix, of some of the tents or scale music wire models of their skeletons, posted at some point. A quick note that the long arch in the tent described in the earlier post is tilted back to about 11 o-clock (30 degrees) to creat more headroom inside and allow more space for the fabric to transition from the arch to the straight roofline at the front apex.
Sam Farrington, Chocorua NH