Hi Simon!

Thx for the link!

“I have a problem with you 'no load' torque”

Yes me too…but the only way for me to compare

“surely this should be 0”

Not 100% sure about that. If Torque 0, Amps/Watts also 0 ?

“And your torque should me in newtons per unit length, so what is your unit length?”

Yep, using this: Watt / (Rpm / 702,3)=Ncm (Value 702,This value is maybe not 100% correct)

“Also why 5.5v not 7.2v”

As Swath stated, voltage cut by El-Mod for Tiger settings

“Finlay since these motors are quite weak, you would of been better to measure RPM with a strobe”

Yes, but with Motor+Gearbox, measuring at the drivesprocket is no problem

“When I measured these motors I found they were repeatable in volts to RPM, the so called 'K' factor”

Yes, used Volt/rpm konstant for calculated values (rpm at 5,5 volts)

“but the stall current was difficult to repeat, due to heating and phase position”

Stall current is just a second before things begin to go up in smoke…I think its better to load/brake the motor under control….

Its Time to build a Dynamometer!

“This is why I have not published them”

Feel free to publish your findings, you are with friends![)]

This was my way to compare different motor/gearbox setups, a combination of measured real values and calculated values. The method is a bit simplified, e.g. motor efficiency, gearbox efficiency, rpm when loaded.

Not 100% perfect, but give you a hint what you could expect.

Best regards

Jake