Showing posts with label gear. Show all posts
Showing posts with label gear. Show all posts

Thursday, June 28, 2007

Navigational aids...


I ordered 8.5 x 11 inch mapping paper from iGage. It comes in a pack of 50, and the above scale shot is from the weigh-in.

569g for 50 sheets: 11.38g each sheet.

This is funny to me because a single map page will weigh as much as the second popcan stove I made.

Nevermind, even at several pounds, there would be scant replacement for good topo maps on a trail I am unfamiliar with.

I bought the CT trail map CD-ROM (also from iGage) and I'm still checking, but I think -- printing both sides -- I can get the number of map pages to about 20 or about 228g.

I'll post my gear spreadsheet soon so you can see how the half pound of maps compares to the rest.

Saturday, June 23, 2007

Shoe Search: GoLite Sun Dragon



The GoLite Sun Dragon pictured above is the first of the trail running shoes I've tried on for the CT. There are about half a dozen more I want to try out, all clock in under 24 ounces (680g) per pair.

I will give the Sun Dragons another chance, but my initial impression wasn't favorable. The shoe has a loose fit in the size I need -- there's a lot of movement in the heel cup and for some reason the outside-mid section of my right foot (and not my left) feels funny in the shoe.

They're made for neutral runners and I pronate (roll in) a decent amount.

There's a lot of room in the toe box and the upper is slightly stretchy so it feels good.

The shoes include an interchangeable fore-foot fitting system that I don't know anything about and neither did the salesperson at REI.

I'm unclear as to whether this is a failure to train on the manufacturer's part, or a failure to learn on the retailer's.

In any case, I will try these on again. Demetri is a cool guy, and GoLite is a local (Boulder) company doing a lot of work to lighten peoples' loads.

Thursday, June 14, 2007

Some of the best mods are simple

If your gear doesn't meet your needs as packaged: fix it! This is easier for some types of gear, and a sleeping pad is chief among them.

A sleeping pad is intended to provide your bones with some padding for the ground (more important for protecting the hips of scrawny side sleepers like me). Additionally, the sleeping pad insulates you from the ground to varying degrees by type and thickness of pad. If you sleep with your head on a pillow (or pack) and rest your feet on a pillow (or pack), you really only need a pad that reaches from your shoulders to your butt, no wider than your shoulders or hips.

Last year I took a Thermarest Ridgerest (the green one) and was pleased with it. I cut it down and was comfortable when I was carrying it and sleeping on it. This year, I'm trying a closed-cell foam pad (the blue ones they sell at REI). It's a little lighter and I think I'll be comfortable.

As a side note, the Ridgerest is lighter, cheaper and provides more insulation per unit area than the Z-rest which is advertised as packing into a smaller area. Most people pack sleeping pads outside of their pack so I'm not sure why this matters, and once you cut your pad down, it's negligible.

Here's why it's worth cutting your sleeping pad down:

Starting Size: 24.5" x 57"
Starting Weight: 213g (7.5 oz.)

Ending Size: 16.5" x 29"
Ending Weight: 70g (2.5oz.)

Weight Savings: 143g (5 oz.)

Interesting stove information

Temporarily neglecting any concern for authenticity of source, I found this neat article on the temperature of a flame as determined by flame color and distance from the base of the flame.

I'll keep my eye on this since it has some implications in designing (or more precisely, sizing) the pot stand for my stove.

Wednesday, June 13, 2007

Making my stove...

I didn't know much anything about gearing up for backpacking on last year's hike of the John Muir Trail.

The gear I took for cooking was no exception. I packed the newly-introduced Jet Boil "Personal Cooking System." It wasn't clear at the time, but now I'm under the impression that anything labeled as fancily as a "Cooking System":
  • Will be heavy,
  • Will be complicated, and,
  • Will be expensive.
The stove won a best-of award from Backpacker Magazine, but I think it was on the criterion that it could bring a cup of water to rolling boil inside of 4 minutes. Granted, it wasn't really that complicated, but the weight was just under a pound at 15.25 ounces (432 g), and the price tag was just shy of $100. This, of course, is before you add fuel into the equation. You have to use special cannisters to fuel this thing. The fuel adds weight and cost, though the Jet Boil is fortunately rather efficient as far as cooking goes, mitigating these factors somewhat.

Nonetheless, when I encountered Nano (and Valerie) 100 miles into the JMT, I was jealous of their cooking equipment. They were both traveling with Brasslite alcohol stoves. They both took an extra two minutes to boil their water, and simmering was a pain in the ass -- but on a long distance through hike, you're happy to sit down for 6 minutes at the end of an 18-mile day. And complicated food was one of the reasons I nearly starved myself last year (more on this in a separate blog).

I will summarize the main benefits of an alcohol stove for you:
  • Lightweight (the Brasslite Turbo II-F weighs in at 1.4 oz / 40 g)
  • Fuel Availability (These stoves burn ethyl and methyl alcohol which are widely available in the most remote of stores as Everclear, denatured alcohol, HEET fuel additive, etc.)
  • Size (The volume of a JetBoil is about half a gallon. The volume of the Brasslite is about half a pint)
  • Simplicity (Just pour the alcohol in a Brasslite and ignite. A Brasslite doesn't have threaded connectors or machined valves, so there isn't much to fix. Try repairing a Jet Boil outside of town).
  • Price (Alcohol stoves can be purchased for well under $50, and plans are freely available on the internets to make them for even less money. Alcohol is also an inexpensive fuel.)
Of course, my argument (let's call it a "point," we're not fighting, are we?) is predicated on the assumption that one likes small, simple, light, cheap and easy-to-fuel cooking devices. This is not always such a high priority for 3-day, 16-mile weekend backpacking trip (and almost never for car camping). But for a hundred-mile trek with infrequent resupplies where you're a day and a half or more from civilization -- well, I would assert that it's indispensable.

When I started looking around for stoves this year, alcohol burners were at the top of my list. I am amazed at just how many options there are. Particularly fascinating to me are the Popcan stoves -- just as they sound, stoves made from spent pop cans. There are a staggering variety of designs available, each with their own benefits and drawbacks.

I quickly became interested in the pressurized design variant. Primarily because of its fuel efficiency. After searching, I located a design that had a few safety and ease-of-construction modifications.

Striving to make the stove even smaller and lighter, I settled on using an energy drink can for the casing. (Also, I haven't been drinking much caffeine lately and have had half a case of Bing! energy drink laying around from a sponsorship meeting I had with them over a month ago for Geeks Who Drink).

Now, I present to you, my energy drink can alcohol stove:

The first item I had to procure, of course, was the energy drink can in question. It is a "standard" energy drink can size. To the left you can see some acetaminophen I was taking since I was a jackass earlier in the day and went on a 26-mile bike ride without any sunscreen on my arms. Behind, you'll see some origami Sonobe module pieces I made -- it's how I pass the time when I'm procastinatng. And finally, to the right, you'll see a printout I made that has 24 radii pointing out to the edges of a circle the diameter of the can. This is the template for making evenly-spaced fuel jet holes.

To make the holes in the bottom of the can (well, not the bottom, but the side of the lip on the bottom) I just used a pushpin. A lot of the instructions on the web use sewing needles held in X-acto knives and other complications. I found that he pushpins were cheaper, stronger, and generally sharper. Also, because of the way you have to hold the pushpin, I think you have a greater amount of control in just barely puncturing the aluminum without greatly enlarging the hole.


Next came the cutting of the can. The directions I linked to above use a box cutter blade screwed to a block of wood. I had just as easy a time using a razor blade I held to the top of the book. the process was the same: I twisted the can against the blade, gently applying pressure until I got through it. You can tell rather easily if you're pressing too hard before you actually dent the can.

To tap the fuel fill hole, I set the can piece on top of the acetaminophen bottle and drove a screw through. To the right of the can halves, you'll see the large bag of perlite generously donated to me by my friend Kat. An inert filler is generally accepted as a way to increase vapor pressure (at the expense of preheating time) while providing a measure of safety in the event the stove is tipped over.

I had some trouble getting the top of the stove to fit around the bottom part. In the original instructions, they more or less assemble the stove before poking holes in it. To encourage a smooth fit, they jam an unopened can into the lower part to enlarge it. Next time, I will give this a go. Nonetheless I got my top on with only minor denting.

This design is one that is likely tight enough to not have any leaks between the two cans, but just to be sure, I applied a bead of JB Weld metal epoxy around the seam of the two cans. This stuff is easy to use and heat-resistant to 600 degrees Fahrenheit. I think I'm going to use it to attach a pilot light base to the stove and maybe a pot stand at some point.

And finally, here's a video the stove's test firing.



I'm pleased with the performance overall. Using pop can tabs as a pot stand (which hold the pot about 2mm above the rim of the stove) I was able to get a cup of water to a gentle boil in 7 minutes using Everclear. This performance is acceptable for my uses, though I'm going to see if I can tune it a little and improve things with a better pot stand and a windscreen. I'm also going to make a stove out of a regularly-sized pop can and see how it performs.

Weight: 13g (0.459 oz.)
Approximate materials cost: $1.00