In article 5lS_c.4605$vI2.1373@trnddc02,
says...


Ned

My problems are associated with a poor decission I made in the design of
this little dyno. I wanted the drag on the load's rotation to be minimal.
So, I made the lines into and out of the pump as flexible as possible. I
thought the output hose could be "light weight" because it is such low
pressiure. My brother-in-law spent his life designing hydraulics for
Northrop. He told me storries about high pressure liquids punching small
holes in outlet hoses due to some caracteristic of high pressure pumps. I
thought -- Oh Sh*t. Since I have other things to occupy my time, I dropped
that dyno for a while.

I appreciate your offer to share your dyno information with me. I wish I
could get involved with a project that uses a big dyno.

What kind of instruments do you use to log the data. I got a Lab Jack but
get confused about how to use it.


The date on the print is 1987 and I didn't do the data
logging portion of the job, so my memory is fuzzy, but I
believe it was a data acquisition card in a PC running a
Labview type application. Torque was measured with a
Himmelstein torque transducer

http://www.himmelstein.com/

and flows were measured by monitoring encoders on the
shafts of motors that were specially selected for low
leakage.

Other than all the complications that resulted from having
to perform bi-directional tests on both pumps and motors,
and run a pre-determined sequence, the basic operation of
these stands was probably not much different than what
you're trying.

Ned Simmons

Ned Simmons