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  1. #1

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    Switchmode BEC vs. battery

    Is it too risky, or maybe even stupid, to use a Kool Flight Ultimate BEC (or others brands of 10S BEC's) instead of a battery in a 2K $ F3A plane ???
    My radio is a JR9303 2.4GHZ with a Spektrum AR7000 in the plane.

    Any experience good or bad ??


    Jens
    Denmark

  2. #2
    Chris Moon's Avatar
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    RE: Switchmode BEC vs. battery

    Using a bec allows for a single point failure to not only lose power to the motor but crash the plane. All of the electric F3A guys that I know use a separate battery or even a dual receiver battery set up to power the radio. Not to say your idea won't work but I would want more redundancy.
    F3A Unlimited

  3. #3

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    RE: Switchmode BEC vs. battery

    I run a UBEC from the 10S, and a second UBEC from a 730 mAh 2S. Both have diodes with different ratings I don't remember the exact value. The 730 pack is used only when the shorting plug isn't installed, and is a backup. With the shorting plug, power is drawn from the 10S. I have had one case where the 10S came loose and unplugged, and know of a few others, so didn't want that or UBEC failure to have any chance of causing a crash. The cost and weight of the redundant power brings a lot of added safety.

    Ken

  4. #4
    patternflyer1's Avatar
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    RE: Switchmode BEC vs. battery

    Yeah, but what do you know Ken? LOL

    Just kidding of course!!

    What bec are you using and how much does it weigh? That seems like a good idea. One I hadn't though of.

    I may be out to practice with you guys on Sunday if I get my stuff back from Airtronics and installed in the plane.. Hope to see ya there!

    Chris
    Team BJ Craft Team F3A Unlimited
    Team JR

  5. #5
    tIANci's Avatar
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    RE: Switchmode BEC vs. battery

    Some pattern guys are flying with a 2S 450 mAh pack for the RX! I been using the new switching ESCs with the built in UBEC, no issues at all but for bigger set ups, I prefer to use a RX pack. Just in case ... just ...
    Its nice to be important, but its more important to be nice ...
    Revver Brotherhood No. 232

  6. #6

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    RE: Switchmode BEC vs. battery

    In the past I used UBEC's exclusively in my 10 cell e-helis, and every one failed in time, but always at startup, So I just learned to put connectors on them and carry a spare. Then one fine day, I had one fail in a 3 foot hover, the machine just rolled over and died. I have never gone back to a UBEC or anything in between my RX power and RX. I use 4 cell NiMH packs only.\

    Just my $.02

    Chris

  7. #7
    patternflyer1's Avatar
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    RE: Switchmode BEC vs. battery

    Good info Chris..

    C
    Team BJ Craft Team F3A Unlimited
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  8. #8

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    RE: Switchmode BEC vs. battery

    So the conclusion must be: Use it, BUT only with a backup.

    Thanks to all, who make their comments.

    Best regards
    Jens
    DK

  9. #9
    patternflyer1's Avatar
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    RE: Switchmode BEC vs. battery

    I have never seen the need for it honestly. The Bec is quite heavy IMO. I would never trust one on it's own.

    I run one 2 cell lipo, and a Jaccio perfect switch. Lipo's are much better than the nicads or nimhs.. I haven't had one lipo fail yet as a rec pack. But I do change the lipo rec packs yearly in my planes.

    Chris
    Team BJ Craft Team F3A Unlimited
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