Feb 2017 JMT PREP and Stove Testing

I’m getting ready for this year’s version of the John Muir Trail (August 2017).

The initial logistics are pretty intensive, but fortunately, this being the third time around, it becomes easier and easier.

Phase I is deciding your dates, getting a permit and making all the necessary arrangements for getting from Virginia to California and to the trail head, and conversely, back home again.

Phase II is deciding upon a menu for 26 days of camping, not including re-supply time at Independence, Muir Trail Ranch (MTR), Reds, and Tuolume Meadows.  Then obtaining all that food, packaging it all up, then mailing the packages, and in some cases the buckets, to the various pick up points. Oh yeah, don’t forget the sun block, TP, water purifier tablets, and surprise treats for yourself!

Phase III is figuring out what you are going to carry in your pack, to achieve one’s perfect balance of weight vs creature comforts.  The incessant weighing and re-weighing of items and the summary court judgment on every single item, “Why do I need you?, What will you do for me?  How much do you weigh?  Are you worth it to carry on back!!!

Because it’s only February and it’s too early to prepare the menu and mail the packages, I’ve jumped ahead to phase III and every backpackers favorite winter hobby of dreaming how to lighten my pack.

Which brings us back around to…stove tests!

I’ve been using a Jet Boil (JB) for about 3 or 4 years, I knew it weighed a lot more, (4 x more than the smallest burner) but DAMN it boils fast!  I mean really fast, but I never bothered to quantify it.

I have noticed a proliferation of these very tiny burners that weigh 1- 1.5 ounces and have gone “WOW! I would like to use that and save weight!!”

Well, much to my satisfaction, I have now quantified the data between several stoves and have reached a conclusion.

Hold on!  Not so fast, first I need to tell you the framework for tests;

Goal – to find the best stove/pot/cup – AND FUEL CANISTER combination for a trip of at least 7 days, but not needing to exceed 7 days.

Best means lightest weight and enough fuel for at least 7 days.  Seven days means boiling (for the test) 2cups of water up to a maximum of 4 times in a 24hr period, for an expected burn schedule of; 1-2 cups for breakfast meal, 2 cups for 2 coffees, 2 cups for dinner package re-hydration, 1 cup for possible evening herbal tea, plus 1 cup extra.

Burns means bringing 2 cups of water to a boil.

Assumptions:

  1. Burn time is not a factor because…well, there’s not much else to do in camp.

  2. Use of a fuel canister stove, with either small or large fuel cans, whichever provides the required number of burns.

  3. Canisters don’t need to last longer than 7 days because that’s the longest time between resupply.

  4. Minimum number of burns required is 28 (7 days of camping X 4 burns per day). This is the most important factor. (ok, this is an assumption and a requirement)

Note:  while reviewing manufacturer data on various stoves and their boil times and fuel usage, the common test factor was the time to boil 1 liter of water, with the water at 68F or room temperature.  I don’t think I’ve ever boiled more than 2 cups at a time and my “room” is the outdoors with the water (snowmelt) at least in the 40F range.  For my tests I used water stored outside with  temperatures in the 40’s.

Note:  For a weekend trip, the final best stove/fuel-can result is totally different because you may only need 4-8 burns.

Here are the tabular data, presented this way because the margins here are so narrow:

STOVE FUEL WEIGHT (GRAMS) BEFORE AFTER TIME TO BOIL TIME (SEC)
JET BOIL TEST 2 NO CUP 194 189 1 MIN 40 SEC 100
JET BOIL W CUP 126 121 1 MIN 50 SEC 110
BURNER W CUP 121 112 4 MIN 43 SEC 293
SNOW PEAK BURNER W CUP 189 178 3 MIN 51 SEC 231
BURNER W SCREEN 112 101 3 MIN 10 SEC 190
POCKET ROCKET W CUP 208 194 2 MIN 14 SEC 134
STOVE FUEL USED TO BRING 2 CUPS TO BOIL (GR) (STOVE OR STOVE + CUP) UNIT WT POTENTIAL BOILS (100 GR CANISTER) UNIT WT STOVE+SM CAN
JET BOIL TEST 2 NO CUP 5 270 20 464
JET BOIL W CUP 5 337 20 531
BURNER W CUP 9 80 11 274
SNOW PEAK BURNER W CUP 11 112 9 306
BURNER W SCREEN 11 80 9 274
POCKET ROCKET W CUP 14 141 7 335
STOVE FUEL USED TO BRING 2 CUPS TO BOIL (GR) POTENTIAL BOILS (227 GR CANISTER) UNIT WT STOVE+ LG CAN (UNIT WT STOVE+ LG CAN) OZ
JET BOIL TEST 2 NO CUP 5 45 626 22
JET BOIL W CUP 5 45 693 24
BURNER W CUP 9 25 436 15
SNOW PEAK BURNER W CUP 11 21 468 17
BURNER W SCREEN 11 21 436 15
POCKET ROCKET W CUP 14 16 497 18

AND THE WINNER IS….

So by selecting the JET BOIL W CUP (24 oz) vs the BURNER W CUP (15 oz), I carry 9 more oz. (wt = stove + cup+ large fuel canister)

The BURNER only gave me 25 burns VS 28 burn minimum and this is the limiting factor.  It gave me only 25 burns, whereas the JB gives a predicted 45 burns (large 220 gram can),  because my criteria was 4 2-cup burns per day, which I know in reality,  might be a bit high.

The number of BURNS is derived from dividing the grams of fuel used to boil 2 cups of 45F water into the total number of grams of fuel per small and large canister.  I conducted the test 3 times per stove and the results were pretty much the same for each test.

My hopeful expectation was that I could use the small burner with only 1 titanium 500ml cup which would double as both a pot AND a cup.  However, this is going to be my new weekend combo!

yours truly,

the end

 

 

 

 

 

 

 

 

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s