I hope there is someone out there who can tell me if I have what I need.

I did some rudimentary pressure and flow tests on this home made waterpump
that is designed to bolt directly on the e-shaft.

Zero flow pressure, starting at 1065 rpm was 2.5 psi, increasing as rpm
squared up to 80 psi at 6000 rpm.

Flow rate with a 2.25 foot lift required on the intake side, zero back
pressure, starting at 1065 rpm was 15 gpm, increasing linearly up to 40 gpm
at 2520 rpm.  Almost no increase in flow rate above that up to 6000 rpm.
However, at 3840 rpm, restricting the output until there was a 20 psi back
pressure did not change the flow rate.

Previous testing with only a 8 inch lift at 2600 rpm resulted in 50 gpm.

It looks to me like, with that much lift, I am intake limited.  On an

engine,

there will be no lift, and the system will be under pressure so I will give
it a try.

I need expert guidance here--what am I overlooking?

Thanks

Bob Darrah

Jeff Spitzer wrote:

One more thing.  There's no mention of the way water is returned to the
barrell.  If the water is allowed to "splash" in and entrain air then the
whole barrell will become airated.  If this happens the pump won't work
worth a damn.  This is an important point for closed systems too.  The
water/glycol MUST be free from air to get max performance.  Even a little
entrained air will do very bad things to system performance.  The system
should be designed with means to constantly separate and expel air.

Jeff Spitzer

 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org