weird idea
 

HI
As you now the shaft of the medusa motors come off the can on the backwards of the motor. Can I put there a propeller or a fan turned by the motor shaft to cool the motor? will it be effective or just seem funny?

Inside the can or outside?

Inside seems pointless unless you drill vent holes. Outside the fan would need to be larger diameter than the motor to cool all of it and that would seem funny. Apart from the additional moving parts to cut your wires, its also extra load on the motor.

Seems more trouble than its worth.

Here is a thread on it. Medusa said they were working on this fan, then they got out of the r/c business. I guess they couldn't figure it out.

Ok. now I can see it's not a unique idea. :oops:
I'll try some fans with a propeller adaptor. If I do something effective I'll put some pictures.

Personally, I think it is not a great idea - the fan will cause the motor to draw more current and reduce runtime with minimal cooling vs a simple 5v fan plugged into the rx. A novelty perhaps, but I would bet it will be less effective and more space prohibitive than the simple and easily replaceable 5v fan strategy.

A small fan to cool the motor? Dont let BrianG know you said that....

Plettenburg (sp) does it.

Jeff

That will suck or blow dirt/sand into the rotor and destroy the carbon wrap around the motor and the next thing we all don't want to see.

True - and they are the only ones that do it AFAIK - for good reason. :)

really with that your only cooling the outside of the can anyway. the meat and potatos are still gonna be nice and warm. you shouldnt need a fan on your motor to begin with if your setup is correct

The plett uses a vane type fan that actually sucks from the center rear and blows the air over machined fins on the can. It is internally sealed. If the motor is sized correctly it is really not necessary, but I guess it can't hurt. I always got as good or better runtimes comparing my pletts to similar neu motors.

Industrial motors are the same way and they don't even have heatsinks. They are refered to as TEFC: Totally Enclosed Fan Cooled. The fan used in these applications are not props but it's a basically a disc with vanes running from the center to the outer edge, and a shroud that directs the air through the rear and directs it over the can.

Just because the motor gets hot doesn't mean it's overloaded "hot" is relative. The cooler you keep electronics the longer they last even on motors. If you are cooling the outside of the motor the inside will be cooled as well, because heat moves from hot to cold its one of the laws of thermodynamics.

Jeff

Neu "Heli" motors have a built-in fan.

And only the heli motors, that is because they dont get much airflow secreted away inside the heli's chassis, and arent exposed to dust and dirt/ gravel etc, hence why a fan is & can be used.