Updated 2021
DC HO MOTORS
Where Speed Lives ...
Tips and Common Sense
Road Race Motors
Every Road Race Motor is made
from select parts, custom
machined, custom wound,
balanced, and measured to strict
standards to insure precision.
These motors are predictable and
powerful.

All Road Race Motors are
designed and built to run on Rail
or Braided tracks powered by
Wall Warts, Batteries, and
Regulated Power Supplies unless
indicated otherwise. The better
the power source, the better the
performance.
Drag Race Motors
Every Drag Motor is made from
select parts, custom machined,
custom wound, balanced, and
measured to strict standards to
insure precision. These motors
have welded shafts and are
wound with High-Temperature
wire. They are predictable and
powerful.

All Drag Motors are designed and
built to run on Rail or Braided
tracks powered by Batteries, or
Regulated Power Supplies only.
The better the power source, the
better the performance.
Building Chassis's:
The performance of your car depends on how well you build it.  Install high performance
armatures in well built chassis's only.  Do not use old brushes.  Always use a new set of
brushes when ever you install a new armature and make sure you adjust the brush
spring tension properly.  Too much tension can cause an armature to overheat.  To little
tension can cause decreased performance and arcing which in itself can cause
overheating.  I have seen brushes melted right into chassis's because of the use of
crappy parts.  New brushes are cheap, use them.
A Word On Magnets
All of the Road Race Motors can run with any magnets you desire. The more powerful the
magnet, the more speed and torque the motor will put out. Watch out though because
sometimes a magnet that is too strong may actually reduce a motors performance, or
damage it. You may need to experiment with different types of magnets to achieve the
results you want from your armature.
Drag Race motors need more powerful magnets. Poly or Neo Magnets are
recommended. The more powerful the magnet, the more speed and torque the motor will
put out. You may need to experiment with different types of magnets to achieve the results
you want from these motors.
Armature Handling
Handle your armature carefully.
Always use a quality armature installation tool to remove and install armatures.  Never
apply any force to the commutator plate.  Any excessive force can cause the
commutator plate to move out of alignment causing decreased performance.
Nicks or dents in the wire windings can decrease performance and render an armature
non-functional.  Just be careful with them ok.
The Difference between Vintage Aurora and AW Armature Shafts
All pancake armatures, and the chassis that run them are not created equal.  The
armature cavity height in an AW chassis is slightly different than a vintage Aurora chassis. 
The usable height in an AW chassis is shorter than a vintage Aurora chassis.  If you try to
install an Aurora armature in an AW chassis the gear plate may distort (bow) once it is
installed and secured.  When the chassis is energized this binding will cause friction,
which will create heat, which will cause chassis damage.  Don't modify the shaft hole in
the gearplate because if you do the armature wire wraps may rub on the underside of the
gearplate.  This will cause heat buildup and possible damage to the wire.

You can see this in my armature shaft illustration below.