The data certainly suggests that there is something very amiss with your
test set up.

Why? How much data have you seen on CLOSED LOOP systems?

What goes out the pump goes in the pump. What goes around comes
around.

You do not seem to be developing anything like the pressure that one

would

expect for the rpm. Bill's data seems much more as one would expect.

Bill's data was taken by an OPEN LOOP SYSTEM!!!!!!!!!!!!!!!!!!!!!!

Any pressure on the outlet side is not reflected on the inlet side.

If you want to characterize the pump performance, the attached figure
shows about a minimum complexity setup. Also if you want to measure
the flow resistance of the block or radiator just put it in the circuit

in

place
of the valve. The reservoir will minimize heating with the increased

thermal

mass, and the system will be self priming .

Also the amount and pressure of water flow that we are dealing with is
not all that power hungry. the attached curve shows the theoretical
pumping power required at 60 gpm and 20 psid is less tha 3/4 hp
50 percent efficiency should be possible with a good pump
Vance

The figure you spoke of was missing. In its place was a prop thrust curve.

Here is the second jpg you sent which seems relevant.

Much of the heat is due to the inefficiency of the belt drive
I am sure. Side loads on bearings etc. etc.

If you are not doing anything on Wednesday come on over to the
hangar and witness the test.

Paul Lamar

Closed loop - open loop - the pump should put out useful pressure, and
you seemed to be developing only heat - which is  one of the reasons why
that sort of loop
is not generally used for characterizing pump performance. The picture
loss\was
apparently" mouse miss" and hopefully this will be the right one/ Vance

The pump is also doing what it is supposed to be doing. 75 gallons
per minute is 75 gallons per minute!!!!!!!!!!!!!!

I am surprised at you Vance. I am sure you damn well know as well as I damn well know
that that tank will NOT provide any more pressure to the pump 
or work any better than a 1.5 inch pipe of the same height
Open loop or closed loop. Did you get a C in hydraulics 101? :)

Looks impressive as hell to the naive laymen of course.

I'll tell you what. You build it and I will hook it to my system and test
it.

Paul Lamar
 
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