"Schertz, William W." wrote:

Actual data taken on 13-B Water pump at 3 different rpm values.  Driven

with

a 3450 rpm table-saw motor with 3 different pulley sizes (2-5/8" , 4",

6")

driving the 3.7" water pump pulley. No evidence of belt slippage or

motor

strain, however I did not use an electronic tach for the rpm

measurements,

just calculations from the motor rating.

Pressure is measured at the outlet of the pump, before going back into

the

barrel through ~ 6 feet of 1-1/4" corrugated sump pump hose.

Pump is supplied from barrel with ~20 feet of 1-1/4" corrugated sump

pump

hose.

The barrel was positioned to provide neutral head in a static position,
however at the higher flow rates, there is clearly pressure drop in the
supply and discharge hose that helps restrict flow.

Bill Schertz

GOOD WORK BILL! I love that kind of info.

Paul Lamar

Thanks for the test results Bill.  Interesting that you see significant
pressure drop in the corrugated hose. That makes me think twice about using
the metal corrugated hose recently discussed.  Do you have any idea how much
drop there was and do you know the diameter of the impeller on the water
pump.  Mazda uses two different sizes.

Tracy Crook
tcrook@rotaryaviation.com

 
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