How Far, How Fast, How Heavy? Calculating the range for unsupported, long-distance hiking
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Carol Crooker
(cmcrooker) - MLife

Locale: Desert Southwest, USA
How Far, How Fast, How Heavy? Calculating the range for unsupported, long-distance hiking on 05/23/2006 22:25:54 MDT Print View

Companion thread to:

How Far, How Fast, How Heavy? Calculating the range for unsupported, long-distance hiking

Edited by cmcrooker on 06/07/2006 08:35:28 MDT.

paul johnson
(pj) - F

Locale: LazyBoy in my Den - miss the forest
Just a bit confused. on 05/24/2006 03:15:45 MDT Print View

. confusion alleviated

Edited by pj on 05/24/2006 05:23:09 MDT.


(Anonymous)
estimate of food per day on 06/01/2006 15:47:26 MDT Print View

I assume then that the amount of food per day is a tally of all food PLUS ALL WATER in my pack divided by the number of days I hike. Is that the rule of thumb to use here?

David Bonn
(david_bonn) - F

Locale: North Cascades
Re: How Far, How Fast, How Heavy? Calculating the range for unsupported, long-distance hiking on 06/01/2006 16:44:57 MDT Print View

Why do I see this thread on your link rather than
the article we are discussing?.

I'm really uncomfortable with formulas that mix dimensions. It is interesting that if you subtract your pack weight in pounds from the maximum distance you can walk (in miles) you can get what appears to be a good estimate of how many miles you can walk with that pack weight. But for me it is hard to know how hard you ought to lean on that estimate unless I understand a little more about *why* that might be the case than just seeing an observed empirical relationship.

The other thing is it isn't clear to me how the fact that food is consumed over the course of the trip is integrated into his equations. Anyone who has taken a long multiday trip knows that the last few days in the trip almost always are the biggest mileage days -- because the pack is so much lighter than on the first days out. That kind of makes an average "miles-per-day" figure meaningless and kind of useless as a point of calculation.

I'll give an example here of what I think is wrong with the trip time and pack weight calculator.

Given a trip length of 120 miles, the ability to walk 44 miles/day empty, 12 pounds base weight, and 2 pounds per day of food the trip calculator tells me I need six days (20 miles per day) and 24 pounds of stuff in my pack.

Here's the rub.

The adventure racing rule says that I should be able to hike 20 miles per day with a 24 pound pack.

But on the second day my pack weighs 22 pounds (because I ate two pounds of food), so I should (in this example) be able to hike 22 miles.

On the third day my pack weighs 20 pounds, so I should be able to hike 24 miles.

On the fourth day my pack weighs 18 pounds, so I should be able to hike 26 miles.

On the fifth day my pack weighs 16 pounds, so I should be able to hike 28 miles.

Now I'm at my destination 120 miles out with an extra day's worth of food.

Ooops.

I'm fiddling around right now, but probably a more correct answer for that 120 mile trip is probably around 4.5 days and 21 and a tiny bit pounds of food.

Edited by david_bonn on 06/01/2006 19:11:21 MDT.

David Couch
(Davidc) - F

Locale: England
Links on 06/01/2006 17:24:26 MDT Print View

Carol,
may I be your best friend and tell you what nobody else will - your links don't work. When I click on anybody else's links they take me to the article referred to. When I click on yours they don't.

I love your reviews, but not your links.

David

Bill Fornshell
(bfornshell) - MLife

Locale: Southern Texas
ow Far, How Fast, How Heavy? Calculating the range for unsupported, long-distance hiking on 06/01/2006 19:18:59 MDT Print View

Companion thread to:


How Far, How Fast, How Heavy? Calculating the range for unsupported, long-distance hiking

Carol Crooker
(cmcrooker) - MLife

Locale: Desert Southwest, USA
Links on 06/07/2006 08:38:20 MDT Print View

Thanks David and Bill.
Let me know if you can't click through now (I was using the format we use within articles but have corrected it for the forums.)