[Gasification] Underwater gasification?

[Anand Karve]

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


On Thu, May 26, 2011 at 10:35 PM, Henri Naths <c_hnaths at telusplanet.net> wrote:
> Dear Anand and List
> My "cart" is a vw Jetta that out weights my Boat of equal hp by about 3,1/2
> times. My cart's hp /weight ratio efficiency is approximately 5x better than
> my boat...  I tend to disagree with Anand because the density of water is
> ~700 times that of air.
> H
> ----- Original Message ----- From: "Anand Karve" <adkarve at gmail.com>
> To: "Discussion of biomass pyrolysis and gasification"
> <gasification at lists.bioenergylists.org>
> Sent: Sunday, May 22, 2011 9:32 PM
> Subject: Re: [Gasification] Underwater gasification?
>
>
> Dear List,
> hauling a boat through water is much easier that pushing a loaded cart
> over land. That is how wind pushed large ships around the world,
> whereas for land transport one needed animal power. A steam jet looks
> very attractive for a small boat. If one can take up the water
> continuously from the river or lake itself, a relatively small boiler
> would suffice for generating the steam.
> Yours
> A.D.Karve
>
> On Mon, May 23, 2011 at 7:51 AM, Daniel Chisholm <dmc at danielchisholm.com>
> wrote:
>>
>> A Humphrey-inspired water jet is an interesting idea.
>> FWIW I don't think it would be an efficient means of low speed marine
>> propulsion though; it would suffer from low propulsive efficiency because
>> the jet velocity would be too high. The efficiency of a reaction engine
>> (which is something that generates thrust by accelerating and expelling
>> mass
>> - a very broad category that includes not just jet and rocket engines but
>> also propellers on aircraft and ships) depends on the speed at which the
>> mass is expelled. Accelerating a small mass to a large speed, is not as
>> efficient as accelerating a larger mass to a lesser speed. If you look at
>> aircraft jet engines today (high bypass ratio turbofans) you will notice
>> that they are much larger in diameter than the jet engines of the 1950s
>> (turbojets) - this is why.
>>
>> --
>> - Daniel
>> Fredericton, NB Canada
>>
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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 *
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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 *