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Old May 30, 2012, 11:35 AM
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Newbie would like to know: What is a BEC?

I see ESCs with and without BEC. Do I need an ESC with BEC?
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Old May 30, 2012, 12:24 PM
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Dr Kiwi's Avatar
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BEC is "battery eliminator circuit" which means your motor [at full voltage] and your Rx and servos [at reduced voltage] are powered directly from your flight pack. If you have an Opto ESC with no BEC you'd need a separate Rx pack or a stand-alone UBEC providing correct 5v-6v to power Rx and servos.

Typically Opto ESCs are used on big planes with multiple servos [4-10] and running on more than 3s voltage [4s-12s].
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Old May 30, 2012, 12:26 PM
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OK. So, if I understand correctly, I DO want an ESC with BEC. I'm talking about a Super Cub that I'm converting to brushless, and I also have a slow stick. So, I want an ESC with BEC, right? Thanks very much.
Dave
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Old May 30, 2012, 01:55 PM
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Yes. It'll save the weight of an extra receiver pack.

mw
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Old May 30, 2012, 01:57 PM
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Thanks - everyone! Now, next question: I'm looking at the Hobbywing and Exceed Proton 40A ESCs. Anything bad to report on either of these? I'm leaning towards the Exceed.
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Old May 30, 2012, 02:09 PM
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Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
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Quote:
... newbie ...
E-flight 101 by RCG member Ken Myers, will at least save you a ruined LiPo (or worse!), a burnt motor and a fried ESC:
http://www.theampeer.org/framesefo.html
-> Electric Power Basics
and this e-book
-> EVERYTHING YOU WANTED TO KNOW ABOUT ELECTRIC POWERED FLIGHT
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Old May 30, 2012, 06:13 PM
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Hastings, New Zealand
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Quote:
Originally Posted by mprs4me View Post
Thanks - everyone! Now, next question: I'm looking at the Hobbywing and Exceed Proton 40A ESCs. Anything bad to report on either of these? I'm leaning towards the Exceed.
They are the same (the Exceed Proton is an OEM version of the Hobbywing Pentium). It is a good reliable low-cost controller, easy to set up (even easier with the optional programming card) and has a switch-mode BEC which stays cool.

A linear BEC gets rid of excess voltage by heating up. If it gets too hot then it will shut down, killing the power to your receiver. A switch-mode BEC is recommended if running more than 3 servos on 3S.
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Old May 31, 2012, 11:19 AM
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Thanks, Bruce. That's good to know so if one is on sale, I'll get that one! LOL! I've been looking for the programming card, but haven't found it yet. Maybe the 40A doesn't have one? I just don't know. Sorry if that's a stupid comment. :0)
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Old May 31, 2012, 04:19 PM
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Found the programming card. Placed my order. My thanks to everyone who responded and helped me learn something today. :0)
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