Ultimate or Standard BEC? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-11-2008, 09:09 AM   #1
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I am: Peter M.
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Ultimate or Standard BEC?

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Hi Guys:

I'm in the process of finishing an E-flight Extra 260 foamy. It is powered by an E-flight Park 300 1380kv motor. Unlike my other foam aircraft, this one uses a separate servo for each aileron. The model will have a total of four servos (HS 55). Will my Castle Creations Thunderbird 18 handle the speed control and servos or do I need a UBec? At what point should a modeler consider a UBec or separate power supply for the radio equipment and motor?

Peter Merkel
MAAC #22527

Murphy was an optimist; fly safe and have fun.
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Old 02-11-2008, 11:40 AM   #2
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I am: Roderick M.
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BEC or separate batteries

Peter,your question is one we all face with small models. The following site is a good one to read for comments on Linear bec's (such as the Thunderbird esc's have), and switching bec's. In general terms, you can safely use 3 servos with the Thunderbird esc, and maybe you can get away with 4 servos when using a 3S LiPo battery. One test is to turn on your radio, (remove the prop for safety reasons), and just move your transmitter sticks so that the servos are moving for about 2 minutes. If your system handles this then you are probably OK to fly with the 4 servo linear bec (Thunderbird bec).


I have done this with good success on the smaller foamy type models, I have adopted the habit of using a separate Switching bec on my larger,
(non Park type models), where the small additional weight is not an issue
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