Dec 23, 2011 at 1:27 pm #1283301
David ThomasBPL Member
@davidinkenaiLocale: North Woods. Far North.
Justin started a thread about how to transit spring snow packs in VERY minimal shoes. Soft and flexible low-cuts. And I imagined having a stiff platform might (1) provide a way to have spikes and (2) provide more floatation. 32 minutes in the garage proved that, yes, you can have both those traits.
Let me just say: I'm not suggesting this for anything but low-angle snowfields and if you have exposure to downhill nastiness, then have self-arrest capacity regardless of what you have on your feet. Personally, I'd just wear stiffer boots and crampons in most cases, but I did find that a slight increase in area greatly decreased postholing.
Anyway, it's 5" x 15" of 5/8" T-111 plywood (because I had it lying around). The heel cup is cut from a steel can and the edges were smoothed on a beltsander and then covered with metallic tape. The heel cup is secured with 4 1-1/4" #7 sheet rock screws. Under the ball of the foot, there are 4 more such screws. And I cut four slots for a 3/4" x 36" nylon strap with a ladder lock fastex buckle. Here's the bottom:
The grooves are routered out of the bottom of the plywood. My thought was to have something akin to a Vibram sole and to resist side-slipping in softer snow.
I wore my softest, most slipper-like shoes (a pair of Merrill's slip-on low-cuts in mesh fabric) and tried them on undisturbed snow, shoveled-refrozen snow banks and the icy driveway.
In undisturbed, I got much less postholing (2-3") with the plywood than with the plain shoes (4 to 16"). In refrozen shoveled snow, neither sunk in but like on ice, I got much better grip because of the 8 screw tips pointing down.
400 grams for one. So not SUL, but it only took me 32 minutes to make and test. With tweeks and varnishing, maybe 1.5-2 hours and $8 of materials. So I'd be fine mailing them to myself just before the snowy passes and tossing them when not needed.
Tweeks: I'd add a heel strap. I'd varnish it so it didn't absorb water as readily. And I'd consider cuting an inch or so off the front because it would allow a more natural stride – less like wearing snowshoes. I used 1-1/4" #7 screws because my 2" #10s in stainless didn't have threads all the way up, but a little longer and a little beefier would have been better. About 1-3/4" in #8, 9, or 10.
Redesign #1: I'd laminate 1/8" door skin plywood onto 1/2" rigid foam to greatly reduce the weight. In other arenas of my life (boats, planes, treehouses) foam-core construction does wonders for weight reduction.
Redesign #2: Justin originally asked just about stiffening up the sole of his shoe. Using more surface area to get better floatation was my idea. 3/8" plywood cut just smaller than his shoe would provide a cheap set of 8-point crampons and weigh about 150 grams each. Way cheap.
Yes, I know it's a hack job. And not for everyone. I just wanted to see if the concept worked.
I was most pleased by the steel can heel cup. Strong, light and bomber – it got very strong once its bottom was screwed to the plywood.
Editted to correct typos.Dec 23, 2011 at 1:43 pm #1815392
Gary DunckelBPL Member
I love the creativity. This is what cold winter days were made for–geeking out on MYOG possibilities. Thanks for sharing…Dec 23, 2011 at 8:08 pm #1815488
I dig it. Full disclosure, if I throw a pair together I will also be writing ROKET SHIP on them, because roket ships are awesome!
I've been thinking of how to get just a little more float in sun softened stuff, this fits the bill.Dec 23, 2011 at 9:22 pm #1815499
Daryl and DarylBPL Member
@lyrad1Locale: Pacific Northwest, USA, Earth
Soooo practical. I love them.Dec 23, 2011 at 10:26 pm #1815508
Justin BakerBPL Member
@justin_bakerLocale: Santa Rosa, CA
lol, that's cool david!Dec 24, 2011 at 3:45 am #1815523
David GoodyearBPL Member
I love it. I just might have most of the raw matierals laying around in my basement. Might have to order the roket ship plywood, do you sell it?
DaveDec 24, 2011 at 5:21 am #1815532
@337guanacosLocale: Pirineos, Sierra de la Demanda
There have been several deaths related to the use of that kind of "crampons". they might work on flat surfaces, only on flat surfaces.
In the book "Safety and Risk" (translation of the name, don't know if there's an english edition) by Pit Schubert, the director of the security section of the Deutsche Alpin Club, you can se a few of the accident analysis. With gore pictures.Dec 24, 2011 at 3:14 pm #1815642
Franco DarioliBPL Member
This one reminds me of another way to speed up snow travel
snow speed testDec 24, 2011 at 7:35 pm #1815666
the screws do not offer up enough surface area to provide grip. Easy to solve though and a good start.
Best snowshoes i've ever seen were an antique pair of a friend, like upsidedown dinner plates [not round] with a big rim , very simple ,they go anywhere.
You must be logged in to reply to this topic.