[Gasification] Underwater gasification?

[Henri Naths]

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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