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On 05/23/2011 11:48 PM, GF wrote:
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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>
<div>.</div>
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<div>GF<br>
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Another point, if you look at the<a
href="http://www.zachmiers.com/pulsejetbook/"> Lockwood
valveless pulse jet engine</a> as described by Bruce Simpson
(not Bart!), you will see <a
href="http://www.aardvark.co.nz/pjet/valveless.htm">"Thrust
Augmentors"</a>, which allow higher thrust by trading
velocity for mass flow. That would help on a boat.<br>
<br>
Dave 8{)<br>
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