Re: Bike tech idea for Jeff

On 1/24/2025 12:06 PM, Jeff Liebermann wrote:

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>

I understood. My comparison of a one pound load vs. a 60 pound load was just to illustrate reasonable extreme situations. My point is that that optimum load is somewhere between those extremes. I thought someone might try to determine that optimum.

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.

--
- Frank Krygowski