[Gasification] OT, now, Boat pulls easier than Cart?

[Anand Karve]

Dear Pete,
just as the settlers in the USA used sails on their covered wagons,
there used to be tow paths along rivers in U.K. where horses, walking
on the tow path would pull a loaded barge which floated on the river.
A horse would have drawn much less weight, if it had been pulling a
cart. Had wheels been more efficient for land transport, nature would
have long ago evolved animals with wheels. But that did not happen,
because a smooth road is a prerequisite of wheeled transport on land.
Yours
A.D.Karve

On Fri, May 27, 2011 at 12:47 AM, Pete & Sheri
<spaco at baldwin-telecom.net> wrote:
> I'm sorry, but I disagree with your comments that the cart would have more
> friction than the boat,  loaded or
> Not.  The density of water vs air has a lot to do with it.  But the two main
> friction sources to compare would be water friction vs bearing and
> wheel-to-surface friction of the vehicle.  I'd agree with you if the cart
> had no wheels and had to be dragged down the road as the boat has to be
> dragged in the water, but this is not the case.
>
> In the history of west in the USA, people used sails on "covered wagons" for
> motive power.  They worked okay as long as there were relatively smooth
> surfaces to run them on.
>
> Google this:
> http://en.wikipedia.org/wiki/Land_sailing
>
> Pete Stanaitis
> -----------------
>
> -----Original Message-----
> From: gasification-bounces at lists.bioenergylists.org
> [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Anand
> Karve
> Sent: Thursday, May 26, 2011 10:57 AM
> To: Discussion of biomass pyrolysis and gasification
> Subject: Re: [Gasification] Underwater gasification?
>
> Dear Henri,
> you have misunderstood me. I said that hauling a boat floating in
> water was easier than pulling a cart on land.  I was comparing the
> friction of the boat with water with the friction of a loaded cart on
> land. The density of air and water have nothing to do with it.  I
> mentioned air only as a motive force. Wind can move a boat easily
> through water but the wind of the same velocity would be unable to
> move a cart on a road.
> Yours
> A.D.Karve
>
>
>
>
>
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-- 
***
Dr. A.D. Karve
President, Appropriate Rural Technology Institute (ARTI)

*Please change my email address in your records to: adkarve at gmail.com *