I'm making a climashield uq 46"w and 72"l. What should my differential cut be?
Here's an example where experience outweighs thought. I bought a No Sniveller because I liked the added function of a wearable quilt, and the price was right (bought it from another HF member). I tried it as an underquilt, and it worked fine! It performed better than some of my early attempts at DIY differential cut quilts. Some years later I won a Nest at MAHHA. I chose it partially because it fits a bottom-entry Hennessy (another often-criticized design that actually has a lot of merit). I've used it also as a supplemental UQ to turn a 3-season insulated hammock into a winter hammock. It works well, like the No Sniveller.
I think the ability of down to fill available spaces makes flat underquilts perfectly workable, but that's something I've learned accidentally, from experience. The thinker and tinkerer in me gravitates toward engineered solutions. And some of my synthetic engineered UQ solutions gravitated toward the ground - that is, despite being somewhat shaped to fit the hammock they were too heavy to suspend easily. Note: all underquilts are only somewhat shaped to fit. One's backside is a moving target.
That said, would I pass up a fine contoured UQ at a MAHHA raffle? Nope.
Would I encourage a DIY newbie to make a differential underquilt? Nope.
Have I gone on long enough? Yup.
Last edited by WV; 02-27-2013 at 12:29.
Sometimes I like to hike and think, And sometimes I just like to hike.
Hiking is'ent about waiting for the storm to pass its about learning to hike in the rain.
Differential cuts come into their own when protection below 30* is important...At 30 * and above traditional flat quilts work fine, are easier to make and cost less. Also this approach readily supports multifunctional designs as well. Please re-read WV posts on the value of flat quilts in use, for testimony on this point.
Moreover, the differential cut is only half the design multiplier... The real benefit comed from body contouring radial baffles...Differentially designed UQ with straight or straight baffles with trimmed ends only do not perform as well as differential cuts that incorporate this second feature. Again thes designs are most valuable when planned for colder weather.
PS added back in the days of the original Differential Designed UQs...The Speer Snug fit (no longer made) and the JRB Mt Washington 4 UQ, it is worth noting the Mt Washinton UQs were designed fisrt with the zero degree capability to optimize the value of cost to use... Only later were the Mt washinton 3s and eventually the fractional Mt Washington design paralleled Greylck UQs.
Last edited by Peter_pan; 02-27-2013 at 11:42.
Ounces to Grams.
www.jacksrbetter.com ... Largest supplier of camping quilts and under quilts...Home of the Original Nest Under Quilt, and Bear Mountain Bridge Hammock. 800 595 0413
You have certainly pinpointed the two aspects of UQ design that people need to think about in choosing and using bottom insulation. Warms my heart (or some other part).
By the way, forgive me for heavy-handed editing in your quotes. I've tried to get the sense of what you offered, but I know I left some details out.
Pan, thanks for reminding me about the differences in much colder temperatures. Sometimes what is "true" or what "works" in one situation (temperature) can seem hopelessly naive in another one. I have the same problem with rain and wind - there are varying degrees of each.