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02-11-2008, 09:09 AM | #1 |
RCC Pro Contributor
I am: Peter M.
Join Date: Feb 2003
Location: North Bay, ON
Radio of choice:
Futaba 18SZ # of RCs: 22
Feedback: 4 / 100%
Posts: 1,688
Total Props: 26
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Ultimate or Standard BEC?
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
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Peter Merkel MAAC #22527 Murphy was an optimist; fly safe and have fun. |
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02-11-2008, 11:40 AM | #2 |
RCC Junior Contributor
I am: Roderick M.
Join Date: Sep 2002
Location: Kelowna, BC
Radio of choice:
Hitec # of RCs: 25
Feedback: 1 / 100%
Posts: 223
Total Props: 1
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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).
http://www.dimensionengineering.com/index.html 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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