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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Bike tech idea for Jeff
Date: Fri, 24 Jan 2025 09:06:03 -0800
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On Fri, 24 Jan 2025 11:43:52 -0500, Frank Krygowski
<frkrygow@sbcglobal.net> wrote:

>On 1/23/2025 9:05 PM, AMuzi wrote:
>> On 1/23/2025 7:55 PM, Jeff Liebermann wrote:
>>> On Thu, 23 Jan 2025 17:38:20 -0800, Jeff Liebermann <jeffl@cruzio.com>
>>> wrote:
>>>
>>>> A sling of firewood is not a light load.  I just weighed it at 30 lbs.
>>>> When green, it's about 40 lbs.
>>>
>>> <https://photos.app.goo.gl/rmqqcZ4g8h6mGg7v6>
>>>
>> 
>> Nice photo. THX.
>> Any reason you couldn't carry less but more frequently?

>I'll note that whatever Jeff weighs, he's got to haul his own weight 
>upstairs every time me makes a trip. That argues for minimizing those trips.
>
>To get 60 pounds of firewood lifted 35 feet, a 175 pound man carrying 
>one pound per trip would do 370,000 ft*lbs of work against gravity, 
>which is mostly just repeatedly lifting his body mass. If he were able 
>to carry the 60 pounds of wood in one trip, his work against gravity 
>would be just 8200 ft*lbs, mostly because his body mass is lifted only once.

Sorry, but I made a mistake.  One load, as in the photo, would be only
30 lbs.  Divide all the above calculations by two.  This is 30 lbs.
<https://photos.app.goo.gl/rmqqcZ4g8h6mGg7v6>

>But human power output is not simple. Carrying 60 pounds might be 
>impossible. Still, it seems there's some optimum size for the load.

In the not so distant past, when I was younger and stronger, I could
do it by carrying 60 lbs distributed in two slings.  Actually, more
like 50 lbs because my left arm is weaker than my right arm.

>Normally the best approach would be to avoid lifting the body mass. Jeff 
>wants exercise, but if we could work out a practical lift device, he 
>could consider getting exercise some other way.

I have a recumbent bicycle exercise machine.  I don't like it, but use
it when I feel like abusing myself.

-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558