Elec. motor speed controller question

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Ted W Lee - 18 Jun 2008 12:53 GMT

I have a P-47 control line plan (from a 1947 MI mag.), and would like to
use an elec. motor instead of gas. Would a speed controller be required
here? Thanks, Ted.

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MJKolodziej - 18 Jun 2008 13:28 GMT

>I have a P-47 control line plan (from a 1947 MI mag.), and would like to
> use an elec. motor instead of gas. Would a speed controller be required
> here? Thanks, Ted.

There are timers for electric control line. Seems to me there is a way to
control throttle from the handle too. I think I've seen them in a magazine
and all I get right now is MA.
mk

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Tim Wescott - 18 Jun 2008 16:31 GMT

> I have a P-47 control line plan (from a 1947 MI mag.), and would like to
> use an elec. motor instead of gas. Would a speed controller be required
> here? Thanks, Ted.

If you want to use a brushless motor you'll need a speed controller --
brushless motors need some electronics provide the commutation that
brushes provide on a brushed motor. Even with a brushed motor it's a
good idea to have a speed controller that'll limit current in the event
that the motor gets stalled -- a hard landing that stops the prop is
much less severe than a hard landing that stops the prop, ruins the
motor, and possibly makes the batteries burst into flame.

As the other responder noted, there are timers for control line use. I
don't know who carries them. If you're in the US (or not) a check on
Brodak's website, or a call, may get you an answer.

Signature

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

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Model Forum / Radio Controlled / Air Models / June 2008

Elec. motor speed controller question