I have a question regarding the running of XXX brushes with this motor (or any other similar motor for that fact). I am using it in a 1:10 tourer on a large open track.
I was running the Trinity XXX brushes (TRI13506NT) in this motor and my other Komodo (the Trinity Pro version) I have. In the Axiom motor I was running the installed purple/purple springs. My other Trinity Komodo has the standard red/green springs.
I have been told that I need to use really stiff springs when running these brushes (silver/silver). Is this the case? Won't that just cause more drag and cause the motor to be slower?
In general the harder the brush the harder the spring you need to run to compensate. XXX brush won't be sprung much different than a F however. In touring car, Purple/Red would be a good baseline. Red/Green is also good for rubber tire.
XXX Brush would be okay for outdoor or if it's very hot, but if you need more power the F will be a better brush but you'll go through them faster. If it were me I would spend the same amount of money on F brushes and try just changing them more often and see if you get better power doing so. You will spend the same amount of money, you'll just be rebuilding more often (fresher motor is faster anyway..)
Stiffer Spring = more torque
and less RPM....when you lighten the springs you are freeing up the motor which will give you MORE rpm and LESS torque.
In touring car you typically need to run a heavier spring setup to generate the torque and also counter act the brush bounce caused by pushing the heavier car. Lighter cars, or high RPM applications and you can get away with springing lighter. The lighter you spring a motor the more rpm it can generate because there is less tension on the comm, the byproduct is however it also makes it easier for the brush to bounce causing you to loose power - there is a limit to how light you can spring for different applications.
With rubber tire you typically spring lighter because you can afford to lose some of the torque. More torque just means a higher chance of tire slippage.
How hot can these motors get before the brushes start burning?
Where do I measure the temp? Can? Endbell?
Want to know how tall it can be geared before I start doing damage to it.
The danger is not in burning the brush but softening your magnets. One issue with KD19's is they run hot, on large out door tracks - especially in the summer - the motor will get so hot that you kill the power of your magnets. Someone in Florida told me they don't run the motors at all during the summer because the heat kills them, they run an Atlas instead since it can tolerate the heat better..
If the comm comes off purple after one run and the brushes look okay, you're geared to the moon and fast. If they come off in one run and the brushes are burned..you've gone too far..