Are there ESC`s out there that can handle 4 servo`s? - RC Groups
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Apr 30, 2002, 04:06 AM
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kushal_22's Avatar

Are there ESC`s out there that can handle 4 servo`s?

will a 20 or 25 AMP esc do then trick? Maybe a pixie 20 or a 25 from castle creations (Yes i know a pixie is from them too)

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Apr 30, 2002, 04:32 AM
Sloping off....
leccyflyer's Avatar
Some of the Shultze escs have a BEC stated as being capable of handling four servos, rather than the two or three of some other speed controllers. They have a neat little table which lists the typical current draw of some servo types and which of their ESCs are suitable for how many servos.

I don't know who supplies Shultze in the USA, but in the UK you can get them from Gordon Tarling.

Hope this is of interest.

Apr 30, 2002, 07:46 AM
Most Exalted Windbag
Hi kushal_2,

I believe you'll be ok with a Pixie 20. I ran one for a brief time with 4 HS-50s. Supposedly the smaller servos draw more amps than larger ones. They rate it at 1.25 A. I measured two HS-50s at 0.24 A for both. I had one each on the elevator and rudder and wiggled both sticks at the same time.

Basket case has flown the same setup longer than I have. I haven't heard him complain of problems.

From what I can see most ESC makers are VERY conservative in rating them for servos.
Apr 30, 2002, 02:18 PM
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Inferno's Avatar
Typically the servo will draw more under load such as wind load on the control surface.....I wonder what those servos draw under flight conditions ?
Last edited by Inferno; Apr 30, 2002 at 02:22 PM.
Apr 30, 2002, 04:54 PM
Most Exalted Windbag
Surprisingly enough when I held the control surfaces firmly, almost to the point of stalling the current draw was the same. I measured them with a Mini Whatt meter. This was discussed some months ago and another person who measured his reported the same anomaly.
Apr 30, 2002, 08:22 PM
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DNA's Avatar
May 01, 2002, 01:45 PM
Registered User


Have been using a GWS 400 ESC with heat sink, 15-20 amp rating in a GWS Zero, 3 nano and 1 HS-81 on retracts, on 8 cell nicads, no problems. An optional heat sink is included with the ESC, all for $30.
Aeromicro has them.

May 01, 2002, 03:15 PM
Superhero, Third Class
astroboy's Avatar
I believe all of the Kontronic Sun series have a 2amp BEC, and are rated for 4 servos on up to 10 cells.