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<div>Further to marine propulsion using the principles of a water jet. The Humphrey pump I inspected at Chingford ran on coal gas, it did not have the "high speed" suggested by Dan.</div>
<div>It performed ten power strokes a minute lifting ten tons of water 54 feet per stroke.The delivery pipe diameters were large, suggesting high volume low velocity. This same pendulum action could be achieved with suitable water conduits designed into the construction of the vessels hull, low in the keel. the cross section of which need not necessarily be circular.</div>
<div> Designing a propulsion system for a boat would probably require the inclusion of an accumulator to provide a fairly constant pressure to an "out put main" where jets at strategic points could be manipulated for steering and manouverability.One feature of of an engine with a fluid piston is the shape of the combustion chamber can be designed to suit a constant pressure explosion, where as the piston can be cone shaped increasing in surface area on descent.</div>
<div>I think it would be fairly simple and low cost to build an air compressor to start with by boring a hole in the ground and install a pipe within a pipe.and get a column of water "see sawing' up and down the hole using the water as a ram to compress air, by exploding gas at one end of the column</div>
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<div>GF<br>
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<div style="FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">-----Original Message-----<br>
From: Anand Karve <adkarve@gmail.com><br>
To: Discussion of biomass pyrolysis and gasification <gasification@lists.bioenergylists.org><br>
Sent: Sun, May 22, 2011 11:33 pm<br>
Subject: Re: [Gasification] Underwater gasification?<br>
<br>
<div style="BACKGROUND-COLOR: #fff; MARGIN: 0px; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; COLOR: #000; FONT-SIZE: 12px" id=AOLMsgPart_0_5b985666-b81d-4ca3-a6a3-00eddec2c32c><PRE style="FONT-SIZE: 9pt"><TT>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 <<A href="mailto:dmc@danielchisholm.com">dmc@danielchisholm.com</A>> 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)
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</TT></PRE></div>
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