Arguing physics with a physicist should be entertaining.

Gordon.
"Brian White" wrote in message
om...
Well, OZZ,
you will be wrong and wrong again without apology,
Actually the hammer pump (also better known as a hydram) uses 60% or
more of the energy DIRECTLY for useful work. Because there is no waste
of energy in conversion, mechanical to electical, electrical to
mechanical again, etc. it is almost impossible for a conventional
electrically powered pump to come close to that 60% OVERALL efficiency
figure!
I have that info from an issue of scientific america. The pulser pump
is a combined airlift pump and tromp. Please look that combination up
in any book over 15 years old. You will not find it. Why? Because it
wasnt there. Probably because it didnt exist.
Low pressure airlift pumps are NOT well scientifically described. Why?
They just extrapulated figures from high pressure airlift pumps. (I
know because my pump easily beat their gestimates)
They never actually bothered to make low pressure airlift pumps. Try
to find information about pumping up an incline with an airlift pump.
You will be a while! Yet it works. How good can it be? nobody knows.
The good thing is that you are begrudgingly argueing about semantics.
People are no longer saying that the pump itself is fake. It is a
start!
Anyway, low pressure tromps combined with low pressure airlift pumps
have NOT yet been yet been described by science. There are
interactions between the tromp and airlift sections which make the
whole system quite a deal more complex to describe than the 2 devices
working seperately.
Finally, if airlift is so inefficient, why do people use vacuum
cleaners? Wetvacs are clearly airlift pumps and it shouldnt be too
much of an imagination leap to realize that dry vacuums are too. And
feed trucks that blow animal feed into tall bins. That is airlift
pumps too. As are many deep wells. That water in your beverage, might
just have been airlifted!
http://nxtwave.tripod.com/gaiatech/pulser/index.htm has lots of pulser
info
http://groups.yahoo.com/group/pulserpump/files/ is where the videos
can be found.
Brian White
Oz wrote in message
...
David Hare-Scott writes

Both the air lift pump and hammer pump lift a proportion of water from
a
body of water that has a head over its destination without input of
energy from the outside by using some of the energy in the head. You
say both types are very inefficient.

They are in that only a small proportion of the available energy is used
for useful work.

Whether that matters or not depends on the situation.

Certainly neither can be considered as 'new' or 'not described
scientifically'.