Sizes
Most modern brushless motors in the hobby industry are identi-
fied by the width and height of the motor housing (see
Figure 3-4). A 2216 motor is 22-mm wide and 16-mm tall. Of
course, not every company subscribes to the exact same nam-
ing conventions, so it’s always a good idea to refer to a spec
sheet when possible.
Figure 3-4. These 2204 motors are rated at 2300 kV and work
with 5- or 6-inch props.
kV Rating
Another spec that you have probably seen stamped on the side
of brushless motors is the kV rating. This tells us the RPM of the
motor for each volt of electricity fed into it. This measurement is
under zero load on the motor, so actually RPM would vary
depending on friction and load. You can now see how this rating
is a sliding scale for RPM depending on the battery voltage. A
higher voltage battery will make the motor spin faster, but the
kV rating is still the same.
Power Train 47
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