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* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *



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For further details of any free events shown here also see the "Shows and Events" section on the forum

*2021 AND SOME EVENTS ARE BEING PROPOSED. Keep them coming and let us know the details! (amstreasure@googlemail.com)

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;:;


Model Sub Weekend, 28th, 29th August. Bluewater Parkway, Greenhithe, DA9 9

Bournville Sub Day. Sept 2021 is looking likely. More details TBA.

Barrow in Furness Regatta and Sub day. Maybe in Sept 2021. Details TBA.

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Most users ever online was 180 on Tue Nov 05, 2019 6:03 am

Latest topics

» GRP end caps
To BEC...or not to BEC? EmptyTue Jul 20, 2021 9:31 am by david f

» WW2 mini sub build
To BEC...or not to BEC? EmptyTue Jul 20, 2021 9:15 am by david f

» Good 3D beginner's tutorial
To BEC...or not to BEC? EmptyFri Jul 16, 2021 3:14 pm by david f

» Looking for drawings and instructions for Hegi U-25 Kit
To BEC...or not to BEC? EmptyThu Jul 15, 2021 1:25 am by Telusboats

» Merit 1/35 X craft
To BEC...or not to BEC? EmptyTue Jul 13, 2021 3:54 am by tsenecal

» UHF radio control for submarines (openLRS, LoRa, FSK etc. on 458Mhz and 433Mhz )
To BEC...or not to BEC? EmptyMon Jul 05, 2021 10:43 am by david f

» The workings of a sheer line submarine
To BEC...or not to BEC? EmptyWed Jun 30, 2021 9:03 am by subkraft

» Bonjour from France.
To BEC...or not to BEC? EmptyMon Jun 28, 2021 1:43 pm by Tobyledog

» Underwater navigation using UHF ?
To BEC...or not to BEC? EmptyFri Jun 25, 2021 5:46 pm by SimonH

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Our users have posted a total of 11427 messages in 1877 subjects

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3 posters

    To BEC...or not to BEC?

    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 3002
    Join date : 2010-11-05
    Age : 61
    Location : Nevada, USA

    To BEC...or not to BEC? Empty To BEC...or not to BEC?

    Post  Tom(ADMIN) Thu Nov 17, 2011 6:44 pm

    What do you guys think of using a BEC on your radio installations?

    I've used them before on surface boats and had the main battery drop down enough to cut the power to the radio...result, a stranded boat. In a sub that could mean a sub down on the bottom with not enough power to get up again, I guess.

    My new submersible will be a dynamic dive boat to start with, so the problem isn't quite that bad, but I do plan to fit a pump and bag later, that's when the problems could arise.

    So, what do you think...fit an extra battery pack for the rx? Or go with the BEC?
    david f
    david f
    AMS Treasurer

    Posts : 2172
    Join date : 2010-11-10
    Age : 71
    Location : Cumbria

    To BEC...or not to BEC? Empty Re: To BEC...or not to BEC?

    Post  david f Fri Nov 18, 2011 1:05 pm

    I wouldn't go with a separate RX battery, Richard.

    I think that Norbert Bruggen put it well in his book. The chances are doubled that one of the batteries will fail.

    Best go with a BEC in my view.


    Actually I now go with a separate switch mode "BEC". Running on 12v I find that the normal BEC overheats and you go into shutdown every few seconds. Most disconcerting!
    Hermann
    Hermann
    AMS member

    Posts : 117
    Join date : 2011-07-03
    Location : at home, near Bremen (Germany)

    To BEC...or not to BEC? Empty Re: To BEC...or not to BEC?

    Post  Hermann Tue Nov 22, 2011 7:52 pm

    Hello,

    I am also a supporter of a central power source design that delivers the power for all the systems on board and I have made good experience with it over the years.
    For receiver and servo supply and vor other low voltage/ power consumers I use some switchmode step-down converters of own design in my models to reduce the main battery voltage (12V or 14.4V) to an intermediate voltage of 6V with linear low-drop post regulators following for each supply path (one for receiver, one for servos ...). Of course the switchmode converters need a good EMI suppression but this is no problem you can't solve.

    Best regards
    Hermann
    david f
    david f
    AMS Treasurer

    Posts : 2172
    Join date : 2010-11-10
    Age : 71
    Location : Cumbria

    To BEC...or not to BEC? Empty Re: To BEC...or not to BEC?

    Post  david f Wed Nov 23, 2011 3:24 pm

    Hi Hermann,

    Yes, I suppose I have had reasonable experiences with switch mode supply. But we have been having an interesting discussion on another Forum (Model Boat Mayhem - Sorry Richard!) with John who suggests that they cause RF interference.

    I realised from this that I have had a problem with this - solved by switching to dual band conversion receivers.

    So my confidence in recommending switch mode power supplies has taken a slight knock but I still think that the BEC principle is the best one.
    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 3002
    Join date : 2010-11-05
    Age : 61
    Location : Nevada, USA

    To BEC...or not to BEC? Empty Re: To BEC...or not to BEC?

    Post  Tom(ADMIN) Wed Nov 23, 2011 3:32 pm

    We shall soon find out, I've gone for an Mtroniks Viper esc with built BEC, and I'll use a Corona rx, I think...I have plenty of them.

      Current date/time is Thu Jul 29, 2021 10:57 pm