[Stoves] Using a differential windlass as motive power for stove

[Kevin Chisholm]

Dear Jeff

1: The "Human Power Rating" as indicated in Mark's Mechanical Engineering 
Handbook is 0.2 HP for a hard working laborour, on a sustained basis. An 
athlete in top condition, such as the operator of a man powered airplane, 
can exert up to about 0.5 HP for a short time.

2: Differential Winch: Most of us have seen a "differential winch" and not 
recognized them as such. The so called "chain falls" used in garages for 
lifting heavy loads (engines out of cars) are a differential winch. Note 
that the internal friction of the winch bearings makes them "self holding". 
The chains must be pulled to hoist the load and also, the chains must be 
pulled to lower the load.

Best wishes,

Kevin
----- Original Message ----- 
From: "Jeff Davis" <jeff0124 at velocity.net>
To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
Sent: Sunday, December 10, 2006 9:33 PM
Subject: Re: [Stoves] Using a differential windlass as motive power for 
stove


> On Sunday 10 December 2006 02:59 pm, steve Taylor wrote:
>> Take a look at this graph.
>> http://www.ent.ohiou.edu/~et181/hpv/hupgraph.gif. It looks like your 8
>> year old can manage considerably less than that.
>
> A person is 1/12 of a hp. (I think that's for a work day)
>
> Source:
> Lyle Cummins
> "Internal Fire"
>
> Some say 1/3 hp but I do not think that would be for a full work day.
>
>
> Best regards,
>
> Jeff
>
>
>
> -- 
> Jeff Davis
> Somewhere 20 miles south of Lake Erie, USA
> http://www.velocity.net/~jeff0124
>
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