Dr Kiwi's Personal Information
Former Museum Curator, research scientist
Location: Chattanooga, Tennessee, United States
Interests: R/C parkflyers, golf, soccer, paleontology!
Occupation: College Adjunct Professor

E-Mail -  [email protected]
As you know, test stand results are no good unless they are accurate and consistent.

To address the first: I recalibrated my stand a few days ago, using suspended weights, and it seems to be exactly where it was two years ago. I used brass balance weights (VERY precise) for readings up to 300g, then I weighed cans of soup etc directly on both my Ohaus Digital Scales, then suspended them from a pulley aligned with the motor thrust line, and read off the thrust [downward force on the digital scale]. All accurate within a few grams at up to 2000g. So far so good.

To address the second: Can I get the same figures each time I test the same prop/motor whatever? I extracted some fairly random numbers for a 10x6 GWS HD and generated this simple graph. If my measurements are consistent, with the same prop, I should get the same thrust reading for a given rpm each time. Right? Well, I reckon this
plot - data from 5 motors using the same prop, on 5 different occasions dating back a month or so - suggests a goodly degree of consistency. Not bad for a hobby-grade test rig.
Link to Motor Data HERE
Motor Test Stand Pictures - HERE
RC Brushless Motors were tested at various voltages and with various propellers.  Amp draw, input voltage, thrust, pitch speed, RPM and motor weight are reported.  The data are reported on an Excel worksheet.   (The spread sheet may also be opened with OpenOffice, a free download from OpenOffice.org.)
by Dr Kiwi

Example of the type of data presented - HERE
How to build the test stand - HERE
EDF test procedure - HERE
Why build a "Pusher" stand - HERE
Test Stand Procedure - HERE
Motor specs and data tables - HERE
Mini Reviews of motors on RC Groups - HERE
Propeller performance - HERE
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