On Tue, 15 Jul 2008 17:59:16 +0000 (UTC), Cydrome Leader
wrote:

rashid111 wrote:
Assuming one has a fairly straight approx 4.5" OD x 10" long round
motor with smooth surface, what would be a good way to get some heat
sink type of deal ?

I am thinking about

A) getting say 3/8 or 1/2 alum channel, cutting it into pieces the
length of the motor and attaching the "strips" flat bottom toward the
motor around the circumference. 3-4 zip-ties holding the Us against
the motor

The motor body has about 141 sq in of surface area. Each 1/2" high al
U-channel 10" long adds 20 sq in (four exposed fin sides)so, assuming
intimate thermal contact (not bloody likely!) you'd need 7 such
channels to double the effective area or halve the thermal resistance
to ambient. In fact, the "fins" won't be anywhere near that
efficient due to thermal drop across the interfaces. Some good thermal
compound between the channels and the motor could help considerably.

Increasing air velocity over the motor will very likely work a lot
better.