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From: Frank Krygowski <frkrygow@sbcglobal.net>
Newsgroups: rec.bicycles.tech
Subject: Re: Bike tech idea for Jeff
Date: Fri, 24 Jan 2025 14:16:40 -0500
Organization: A noiseless patient Spider
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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