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Is it a good idea to ues my built in BEC ?

Old 12-10-2010, 12:14 AM
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redriverflyer
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Default Is it a good idea to ues my built in BEC ?

Is it better to use a built in BEC or use a separate power source?
Will a hi-amp set up differ from a more stock set up? Thanks for any
help.
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Old 12-10-2010, 12:25 AM
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firemanbill
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It depends on what you are doing. For the smaller parkflyer stuff the onboard BEC is generally sufficient. When you start going up in amps to high power set ups is when I use a separate BEC, The Castle's are my brand of choice.

Most 4 cell and above setups require the use of a separate BEC, almost mandatory really. In the High Voltage setups (8 cell and above) I use receiver batteries just like you would in a glow plane.

Oh, and Welcome to Wattflyer!
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Old 12-10-2010, 12:25 AM
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CHELLIE
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Originally Posted by redriverflyer View Post
Is it better to use a built in BEC or use a separate power source?
Will a hi-amp set up differ from a more stock set up? Thanks for any
help.

1. with a 2.4 radio always use a UBEC to prevent a brown out.
2. with a known high amp set up, always use a ubec.
3. if your ESC built in BEC is less than 3 amps, always use a ubec.
4. for peace of mind and cheap insurance, always use a UBEC
5. if using 4 or more lipo cells, always use a UBEC.

http://www.wattflyer.com/forums/show...t=ubec+chellie
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Old 12-10-2010, 12:29 AM
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firemanbill
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Well differing opinions there... I have several parkflyer size planes, all on 2.4 and have never used external BEC's in any of them.
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Old 12-10-2010, 12:34 AM
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CHELLIE
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Originally Posted by firemanbill View Post
Well differing opinions there... I have several parkflyer size plane, all on 2.4 and have never used external BEC's in any of them.

Its A- Ok to have Different Opinions that what makes the world go around, Ten different people will have 10 different opinions, Thats ok I had a AR6000 2.4 receiver on a park flier go into a brown out situation with no UBEC, and totalled out a plane, speaking from experience here, now i always use a ubec with a park flier on 2.4, Its just darn good Cheap Insurance, Hope that helps, Chellie
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Old 12-16-2010, 03:37 AM
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redriverflyer
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So far the stock setup has worked very well with my Futaba 2.4 radio an receiver.Now planning to move up to a more powerful setup i will use a separate battery to power the receive an servos.This will definitely add some insurance,well worth the effort.Thanks for your help
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Old 12-16-2010, 03:52 AM
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tampaflyer
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if i use anything above 4 9gram servos i go UBEC... the 10.00 is just safer...
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Old 12-16-2010, 07:25 AM
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CHELLIE
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Originally Posted by redriverflyer View Post
So far the stock setup has worked very well with my Futaba 2.4 radio an receiver.Now planning to move up to a more powerful setup i will use a separate battery to power the receive an servos.This will definitely add some insurance,well worth the effort.Thanks for your help
if your plane is big enough to carry the extra weight of a receiver pack, that a good way to go, if not, a UBEC is the way to go, its a lot lighter than a receiver pack.

Originally Posted by tampaflyer View Post
if i use anything above 4 9gram servos i go UBEC... the 10.00 is just safer...
I am with you on that yes its cheap plane Insurance. you spend hours building your plane, you have motor, esc, receiver, servos that have costed you dearly not to mention the cost of the plane, why would anyone rick all that time and money and not use a UBEC
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Old 12-16-2010, 10:37 AM
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If the ESC has a built-in SWITCHING BEC I'll use it. Since a UBEC is the same thing but separate I can't see the point of buying an extra one when I've already paid for the one built into the ESC .

If the ESC has an old-fashioned linear BEC then I agree with most of the points made above about UBECs.

OTOH I HATE using a separate Rx battery. One of the nastier crashes I've seen was someone with a separate RX battery "for safety". And it probably would have been safe....if only he'd remembered to charge that battery. And my memory is so bad that I can easily imagine me charging the main motor battery and forgetting about the second battery .

Steve
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Old 12-16-2010, 02:10 PM
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Saddlebum
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Originally Posted by redriverflyer View Post
Is it better to use a built in BEC or use a separate power source?
Will a hi-amp set up differ from a more stock set up? Thanks for any
help.
What airplane, Rx, battery, etc.? (It makes a difference).

I run multiple airplanes with E-Flite ESC's up to 60 amps and batteries from 1S to 4S (4,000mAh) with hundreds (maybe a thousand) of flights and zero problems, but my giant airplane (85 amp, 10,000mAh) has a separate 2,200mAh LiFo battery for the Rx.

...The Bum
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