Thanks all for the reply - I feel better now.

[Wm_cheng]

Thanks all,

I could be from the motor, but the same motor didn't make the sound when it
had a mechanical speed controller attached to it. The sound does go away
when I run it at full tilt. I don't think I can fit the fins on without
some serious modification to the dust/debris cover, but there seems to be
adaquate room inside to cool, and there are little fins on the ESC itself,
just not as many as the supplied attachments.

Thanks again,
William

[Pt3]

Running without the other heat sinks is asking for trouble. Don't worry
about the noise you are hearing. I've been building electrics for about 15
years now and all have that should. Some more then others but all have it.
You have to remember that the mechanical is taking a large step forward,
while the ESC is letting you start extremely lower.

Patrick


"Wm_cheng" <No_spam@sympatico.ca> wrote in message
news:fHoQ9.2124$8n5.548707@news20.bellglobal.com.. .
> Thanks all,
>
> I could be from the motor, but the same motor didn't make the sound when
it
> had a mechanical speed controller attached to it. The sound does go away
> when I run it at full tilt. I don't think I can fit the fins on without
> some serious modification to the dust/debris cover, but there seems to be
> adaquate room inside to cool, and there are little fins on the ESC itself,
> just not as many as the supplied attachments.
>
> Thanks again,
> William
>
>

[Paradox]

"Pt3" <rfeded@nospam.com> wrote in message
news:0%rQ9.31302$ac.2512@nwrddc01.gnilink.net...
> Running without the other heat sinks is asking for trouble. Don't worry
> about the noise you are hearing. I've been building electrics for about
15
> years now and all have that should. Some more then others but all have
it.
> You have to remember that the mechanical is taking a large step forward,
> while the ESC is letting you start extremely lower.
>

when its whining there is maybe a .25 volts going to the motor, not enough
to make it crank.

> Patrick
>
>
> "Wm_cheng" <No_spam@sympatico.ca> wrote in message
> news:fHoQ9.2124$8n5.548707@news20.bellglobal.com.. .
> > Thanks all,
> >
> > I could be from the motor, but the same motor didn't make the sound when
> it
> > had a mechanical speed controller attached to it. The sound does go
away
> > when I run it at full tilt. I don't think I can fit the fins on without
> > some serious modification to the dust/debris cover, but there seems to
be
> > adaquate room inside to cool, and there are little fins on the ESC
itself,
> > just not as many as the supplied attachments.
> >
> > Thanks again,
> > William
> >
> >
>
>

[Rick Russell]

In article <fHoQ9.2124$8n5.548707@news20.bellglobal.com>,
Wm_cheng <No_spam@sympatico.ca> wrote:
> I could be from the motor, but the same motor didn't make the sound when it
> had a mechanical speed controller attached to it.

The ESC switches the voltage on an off rapidly to control the
speed. _The switching causes the noise_.

> some serious modification to the dust/debris cover, but there seems to be
> adaquate room inside to cool, and there are little fins on the ESC itself,
> just not as many as the supplied attachments.

As long as you're running the stock 540 motor, I don't think you'll
have a problem.

Rick R.

[Mathew Kirsch]

"Wm_cheng" <No_spam@sympatico.ca> wrote in message news:<fHoQ9.2124$8n5.548707@news20.bellglobal.com>...
> I could be from the motor, but the same motor didn't make the sound when it
> had a mechanical speed controller attached to it. The sound does go away
> when I run it at full tilt. I don't think I can fit the fins on without
> some serious modification to the dust/debris cover, but there seems to be
> adaquate room inside to cool, and there are little fins on the ESC itself,
> just not as many as the supplied attachments.

The squealing/beeping/humming noise is DEFINITELY from the motor. It's
perfectly normal when you have an ESC installed. An ESC operates by
rapidly switching the power on and off to the motor, thousands of
times a second.

Some ESCs are rated at 3000Hz, for example. This means the ESC cycles
3000 times per second. Each cycle is an opportunity to turn the motor
on and off. At 50% throttle, the motor is turned on and off during
every other cycle. At 25% throttle, the motor is turned on and off
during every fourth cycle. At 3/4 throttle, the motor is turned on and
off three out of every four cycles.