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<DIV><FONT size=2 face=Arial>ps </FONT></DIV>
<DIV><FONT size=2 face=Arial> I think the beauty of the a<FONT size=3
face="Times New Roman"> Humphrey-inspired water jet is that it would
have relatively no moving parts so it's weight to power ratio of
efficiency is better than that of other engines overcoming the friction losses
of a conventional water jet engine (as per water ski)</FONT></FONT></DIV>
<DIV>H.</DIV>
<DIV style="FONT: 10pt arial">----- Original Message -----
<DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A
title=c_hnaths@telusplanet.net href="mailto:c_hnaths@telusplanet.net">Henri
Naths</A> </DIV>
<DIV><B>To:</B> <A title=gasification@lists.bioenergylists.org
href="mailto:gasification@lists.bioenergylists.org">Discussion of biomass
pyrolysis and gasification</A> </DIV>
<DIV><B>Sent:</B> Thursday, May 26, 2011 8:57 AM</DIV>
<DIV><B>Subject:</B> Re: [Gasification] Underwater gasification?</DIV></DIV>
<DIV><BR></DIV>
<DIV><FONT size=2 face=Arial>Hi Daniel,and list</FONT></DIV>
<DIV><FONT size=2 face=Arial>< <FONT size=3 face="Times New Roman"> 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.></FONT></FONT></DIV>
<DIV><FONT size=2 face=Arial>Have you considered the propulsion end of a jet ski
or a Jet Boat in your analysis . True the efficiency is slightly lower than
a straight prop boat but it is expelling a relatively small
stream of water at a high velocity. I hear what you are saying about
the jet engines but as I previously pointed out in a post ,
water has 700 times the density than that of air so you have to
factor that in the formula.</FONT></DIV>
<DIV><FONT size=2 face=Arial>Thanks </FONT></DIV>
<DIV><FONT size=2 face=Arial>Henri </FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=dmc@danielchisholm.com href="mailto:dmc@danielchisholm.com">Daniel
Chisholm</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=gasification@lists.bioenergylists.org
href="mailto:gasification@lists.bioenergylists.org">Discussion of biomass
pyrolysis and gasification</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, May 22, 2011 5:51 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Gasification] Underwater
gasification?</DIV>
<DIV><BR></DIV>A Humphrey-inspired water jet is an interesting idea.
<DIV><BR></DIV>
<DIV>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.</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>-- <BR>- Daniel<BR>Fredericton, NB Canada<BR></DIV>
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