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<DIV><FONT size=2 face=Arial>Hi GF and list</FONT></DIV>
<DIV><FONT size=2 face=Arial>The advantage of a constant pressure explosion
would be I guess for a smoother delivery? Your air compressor
idea is very intriguing..could you explain how one would expel the burnt fuel
after the power stroke.</FONT></DIV>
<DIV><FONT size=2 face=Arial>H.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=gfwhell@aol.com href="mailto:gfwhell@aol.com">GF</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=gasification@lists.bioenergylists.org
href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, May 23, 2011 9:48 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Gasification] Underwater
gasification?</DIV>
<DIV><BR></DIV><FONT color=black size=2 face=arial>
<DIV style="FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">
<DIV id=AOLMsgPart_1_983d94a2-b7ed-4bf1-9141-7311baa7c1ce><FONT color=black
size=2 face=arial>
<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>
<DIV style="CLEAR: both"></DIV>
<DIV>.</DIV>
<DIV> </DIV>
<DIV>GF<BR><BR></DIV>
<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)
*Please change my email address in your records to: <A href="mailto:adkarve@gmail.com">adkarve@gmail.com</A> *
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