motor.
with an electronic speed controller equipped with generous heat sink, and an aluminum mount
provided by George. The complete package is $55, and can be ordered without the motor mount
for $5 less.
The second motor is a CD ROM type from Custom CDR of New Mexico. It sells for $35 but the
user must purchase a brushless speed controller. I am using a 10 amp Castle Creations
controller with this motor.
and other sources. Due to its excellent price and value it has found a lot of favor among combat
fliers. The motor with mount and speed controller as supplied by GRS models weighs 3.4 ounces.
It is a brushless outrunner. In testing with a 2 cell Lipo 1,320 Mah pack the rpms were recorded at
7,200 on an APC 7X5 prop. The pack was partially discharged so it is likely the motor will crest at
near 8,000 rpms with a fresh pack. The included mount allows it to be mounted to a stick or the
radial mount can be used to mount it to a firewall. If the radial mount is removed it could be
mounted using the tube method. To attach the prop a "wobbly" prop saver was installed then one
of the inserts provided with the APC was used to mate it to the wobbler. An included nylon locknut
was clamped down to provide additional security.
also adds bearings to the engine and winds it in either sport or speed versions. The motor
shown above is a single stator motor but Custom CDR will also make double and even triple
stators for you. Their customer service has been excellent. The motor weighs .9 ounces and is
mounted using a brass tube as shown above. With a fresh pack the motor turns slightly over
8,000 rpms on a 2 cell lipo of 1,340 Mah turning an APC 7X5 electric prop. The BP12 and the
Custom CDR motor are very similar in performance so the choice boils down to cost, weight, type
of mounting and suitable shape for your plane.