pulse jet engine

"Barry Palmer" wrote in message
...
This unit appears to be some sort of ejector (jet) type pump, where the
momentum of high velocity steam is transferred to the water, raising the
mass
of the entire stream so that the thrust is produced at lower exit velocity
and
therefore lower energy flow.

Not only is the thermodynamics of heating and cooling questionable from
an
energy conservation standpoint, ejector pump (NOT jets found currently in
marine use) efficiency is usually quite low, even when fluids for jet and
reaction are the same density. Do I see another "Magnetohydrodynamic
drive"
scam in the works?

Subject: fun new engine
From: "malcolm"
Date: 7/26/03 7:05 AM Pacific Daylight Time
Message-id:

the principle is similar to the WW2 V1 Pulse Jet Engine.
instead of flap valves they use pressure and cavity shape from what I can
gather.
and steam instead of burning kerosine, and of course water as the
reaction
medium.
if the system is expensive when it comes out that will be a shame,
but should be easy (maybe) to DIY a system for a small boat.
I am sure somebody will do some plans and work it out.
regards malcolm

"Patrick" wrote in message
...
Sounds a wee bit like those little flash steam model boats we used to
make
as kids.
A U shaped bit of copper tubing would project from the stern of the
boat
just on the water line. And would run slightly down for about 3" to a
meths
burner.
After heating up, the boat would be put into the pond or whatever, a
little
water would enter the pipe and run down to the hot part where it would
be
vapourised causing a jet of steam to come out of the pipe, propelling
the
boat along with a series of Put Put Puts
Good fun, I think I might go and make one now for the Kids!
Patrick

----------
In article , "malcolm"
wrote:


you might find this interesting.
http://www.pursuitdynamics.com/default.asp
radical new form of water pulse Jet for Boats.
regards malcolm







Barry Palmer, for A
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