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Old Dec 18, 2005, 07:47 PM
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Two brushless motors off one ESC?

I've heard this isn't a good idea, but I've also seen places, like M-A-E, sell twin motor kits running off a single ESC.
My plan was to run two Medusa 5300's (in EDF40's) off a single Thunderbird-18.
Is this not a good idea, and if not, why?
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Old Dec 18, 2005, 08:08 PM
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Inrunners do not work well on one ESC. The MAE kit is comprised of outrunners.
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Old Dec 18, 2005, 08:16 PM
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Ok...

And the Medusa's are inrunners, correct?
By not run well, you mean you'll fry the speed control, or can the motors get out of "sync" and cause general havoc? Does the BEC just tell the motors to turn, or is there some type of feedback the BEC relys on from the motor? If so I can see why two motors isn't a good idea.

I couldn't find a thread on this but let me know if all this is covered somewhere in here already.

Thanks,

Justin...
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Old Dec 18, 2005, 08:37 PM
hul
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this question comes up frequently, but seems to be hard to search for.

This is a recent thread: http://www.rcgroups.com/forums/showthread.php?t=329491

Some people (me included) run 2 brushless motors on one ESC, others tried but failed, still others say it's impossible without having tried.

Start up is the hard part, no issues once both motors are running.
Success seems to depend on:
- the ESC (some are better than others)
- the type of motor (non-cogging seems to be better than cogging)

These are the things that don't make a difference, IMO:
- having the wiring exactly the same to both motors (because the ESC looks at voltage, voltage doesn't really care how long the wires are (within reason))
- inrunner / outrunner (they're not different electrically)

Try it.

Hans
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Old Dec 19, 2005, 02:09 AM
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Here is what Castle Creations has to say about it.

http://www.rcgroups.com/forums/showt...38#post4731103

Sometime you get away with it, sometimes you dont.

The worst that will happen? = Crashed plane and fried ESC.

Up to you to decide if its worth the risk.

To me, its worth the extra cost of one more esc to have the peace of mind to know that it WILL work every time I close and open the throttle

Larry
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