Brushless actiyators!!
 

hi

i recently got myself a dragonfly 36.
it came with a ds something motor (grey)

i want to get a brushless motor and actiyator..
but i dont know the difference between esc and bec

i want the motor to spin at a constant rate but i dont know which of the two does that
or maybe its both.. im not sure

so if u have had any of these..
please give me detials of what it does and any advice you can give

Thanks in advance

RE: Brushless actiyators!!
 

ESC - Electronic speed control

BEC - battery eliminator circuit, usaually built in to an ESC

a governer makes the rotor head spin at a contstant speed on a CP heli

RE: Brushless actiyators!!
 

ok...

so if i get a brushless motor with BEC actiyator.

the blades wont spin at a constant speed?

RE: Brushless actiyators!!
 

Some brushless ESCs (like the Castle Creations Phoenix) can be programmed into a governor mode for helis... look for an ESC with this feature...

RE: Brushless actiyators!!
 

i want to get a brushless walkera actiyator from ebay
it says it's a speed control but has writen BEC on it

will that give it a constant speed?
i dont know what a governer is or how to get one.

it says it gives a contineuos output, im not sure if thats what im after.

RE: Brushless actiyators!!
 

Take a read through the [link=http://www.rcgroups.com/forums/showthread.php?t=342744]Electric Helicopter Beginners Guide[/link]

RE: Brushless actiyators!!
 

I have a similar heli - here's my setup:
Himaxx 2015 motor
Phoenix 10 ESC (I had to program it to remove the engine brake, but I didn't program the governor)
3c 1100mah li-ion battery
stock rx

A BEC won't do you any good by itself. Basically, the bec was designed for older esc's where the bec isn't built into it. almost every newer esc has the bec built into the circuit, at least most any esc designed for brushless motors. The BEC provideds power for the rx and the servos without the need for a seperate connector coming from the battery. The newer esc's provide the power through the connector to the rx, so there's no need for any extra equipment. I would say that as long as the esc you want is designed for brushless motors, then it probably has a bec built into it. it the esc says "BEC" on it, then that's probably just the manufacture's way of advertising. I don't know if this helps much.

RE: Brushless actiyators!!
 

This is not entirely true, external becs are still used and nescesary depending on what you are trying to do.

Most ESC's with a BEC are designed to work comfortably with 3 servos, 4 is usually pushing it unless they're low torque servos, which isn't what you want to be using with a helicopter. This depends of course on the type of helicopter, small micros are usually okay since micro servos don't suck up too much amperage to begin with, but when you start going into larger models that require slightly more power such as the T-rex, eco 8, logo 10, etc. Most ESC's will choke out and burn up on 4 servos unless they're designed specfically for that purpose (as some ESC's are), at which point, an external BEC is needed, or a seperate receiver pack. Obviously an external BEC is preferred as it's lighter. If given the option I would go with an external bec, it simply puts less strain on the ESC, and keeps it running cooler.

Allthough, for the #36, you're probably OK using an ESC with a BEC in it.

Just though i'd point that out :) External BEC's are still needed for us fellas who fly the bigger helis :(

RE: Brushless actiyators!!
 

That's right, I'm still used to the micro helis. thanks for the correction credence.