ABOUT RC MOTORS
The single most important thing about motors is that cleaning is the
priority. The best way to improve the performance of a motor is to keep
it CLEAN. It does not mean to spray it out once a month with motor spray,
instead an absolute cleaning is very important. If you are a serious
racer cleaning motors means extra and free horsepower for the engine.
This is because it gives proper inflow of fuel and prevents and contaminants
or foreign bodies from hurting the machine.
Cleaning of all components is an important aspect. It is very important
to clean the brushes and the commutator since this is where the power
is applied. Any drop in the resistance of the connection from the brushes
to the commutator will be rewarded with either an increase in power
or efficiency, or BOTH!
Allowing brush dust to allowed to accumulate on the brushes and the
com shall add resistance to the connection of the batteries to the motor.
As the resistance of that connection is increased, performance is decreased
because some of the battery power is converted to what is called 'I-squared-R
losses'. This results in heat being produced at the brush connection
instead of power being transferred to the com.
The best way to keep brushes and com clean, without cutting them, is
the little shaped eraser-looking things from RPM. Using one on both
brushes and the com between runs and keeps the motor 'fresher' between
visits to the com lathe. There is not any real marked difference between
the yellow one and the black one, they both seem to do the same thing
Another way to keep peak performance is to be sure that the com is true.
This is accomplished by regularly cutting the motor on a com lathe.
Doing it about every 5-10 runs may seem excessive but doing it so often,
it ends up only end up taking .001-.002 from the surface. Since taking
only such a small cut, the motor can be re-trued upwards of 25 times.
Springs are yet another way to alter the performance of a motor. Asphalt
is for Racing, Dirt is for Planting Potatoes. Anyway, in 4-cell 1/12th
scale, it is best to run LIGHT springs. Run a Trinity gold on the '+'
and a Trinity silver on the '-'. This has proven, after what seems like
months on the dyno, to be the best combination for 1/12th scale STOCK
racing. 4-cell mod follows basically the same rules of thumb for springs,
but the timing needs to be adjusted for maximum efficiency as well to
take full advantage of what the motor can do.
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