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*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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Latest topics

» GRP end caps
ESC for a LiPo pack? EmptyTue Jul 20, 2021 9:31 am by david f

» WW2 mini sub build
ESC for a LiPo pack? EmptyTue Jul 20, 2021 9:15 am by david f

» Good 3D beginner's tutorial
ESC for a LiPo pack? EmptyFri Jul 16, 2021 3:14 pm by david f

» Looking for drawings and instructions for Hegi U-25 Kit
ESC for a LiPo pack? EmptyThu Jul 15, 2021 1:25 am by Telusboats

» Merit 1/35 X craft
ESC for a LiPo pack? EmptyTue Jul 13, 2021 3:54 am by tsenecal

» UHF radio control for submarines (openLRS, LoRa, FSK etc. on 458Mhz and 433Mhz )
ESC for a LiPo pack? EmptyMon Jul 05, 2021 10:43 am by david f

» The workings of a sheer line submarine
ESC for a LiPo pack? EmptyWed Jun 30, 2021 9:03 am by subkraft

» Bonjour from France.
ESC for a LiPo pack? EmptyMon Jun 28, 2021 1:43 pm by Tobyledog

» Underwater navigation using UHF ?
ESC for a LiPo pack? EmptyFri Jun 25, 2021 5:46 pm by SimonH

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    ESC for a LiPo pack?

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    Tom(ADMIN)
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    ESC for a LiPo pack? Empty ESC for a LiPo pack?

    Post  Tom(ADMIN) Thu Nov 07, 2013 3:38 pm

    David Forrest, help me out here, please! You're the resident LiPo expert...

    I've had a look round at LiPo friendly esc's, and now I'm totally and utterly confused. Do I really need a programmable esc? What the hell is a programmable esc anyway? All I really want is an esc to run off my LiPo battery pack (3S, 11.1v, 5000a/h...you know the one), to be able to handle a 545 brushed low drain motor, and to cut the power off when the battery pack voltage drops to save the battery from damage.

    Is there such a thing that I can just plug it in, turn it on, and go sailing without all the technical stuff?




    (confused from Sussex....)
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    Tom(ADMIN)
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  Tom(ADMIN) Thu Nov 07, 2013 3:50 pm

    I think I may have found one, courtesy of Andy L...

    ESC for a LiPo pack? 40fr_e10

    Description taken from www.microgyros.com

    * waterproof
    * choice of 4 operating frequencies for smooth and quiet operation
    * variable soft start
    * Internal 5.3v BEC or operates with receiver packs (2s Lipo,LiFe,4,5 or 6 cell NiCd or Nimh)
    * Low voltage cutout,slow down or indication for 2s,3s,4s lipo batteries
    * indication on bec supply or receiver pack below 4.0 volt
    david f
    david f
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  david f Thu Nov 07, 2013 5:35 pm

    Well you can go that route, Richard. But I don't think there is yet a really satisfactory esc for lipos yet.
    (BTW I see that Mtroniks also do escs for lipos - if you don't want to use Microgyros - they are a very small outfit.)

    The problem is that they all seem to indicate low voltage by a reduction in speed. Would you notice that ?? (Weed patch, radio gremlin etc.) It is much clearer for electric r/c aircraft!

    I just use a simple total voltage sensor which triggers an audible alarm - which I may notice when I bring the sub close. This is not a perfect system either. Flashing light? - awkward to connect up.

    In practice, I never run my lipo driven subs for longer than about 30 minutes so I have loads of capacity left. I have never damaged a lipo in about 5 years of operation. (On a risk basis, I have had several instances of "total sub - loss" in that period and for that you need a Pinger.)

    So maybe just use a standard esc (probably much cheaper) and don't run your sub for too long.

    I'm sure that this answer will not satisfy the theoreticians - but it works!

    David
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    Tom(ADMIN)
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  Tom(ADMIN) Thu Nov 07, 2013 5:49 pm

    I've plenty of Mtroniks esc's, so maybe I'll use one of those. With 5000a/h and a low drain 545 motor, I guess I'll get plenty of run time?
    david f
    david f
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  david f Fri Nov 08, 2013 8:37 am

    Several hours I would think, Richard.
    You can also buy some neat little lipo voltage monitors which plug into the balancing (i.e charging) socket. Green leds change to red leds to give you a visual indication through the WTC.

    So with a large capacity lipo and being conservative on run times you should be OK with standard ESCs.

    David
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    Tom(ADMIN)
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  Tom(ADMIN) Fri Nov 08, 2013 9:04 am

    Thanks David,

    I'll give that a try before I give my flexible friend another beating, I can hear it trembling in my wallet as I type this...

    The LiPo charge bag arrived this morning, and I only ordered it yesterday! Cracking piece of kit it is too, well pleased with it.

    ESC for a LiPo pack? Photo_63
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    Tom(ADMIN)
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  Tom(ADMIN) Fri Nov 08, 2013 9:19 am

    Is this the sort of voltage monitor you mean, David?

    http://www.sussex-model-centre.co.uk/shopexd.asp?id=43764

    ESC for a LiPo pack? Koko-b10



    Richard
    david f
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  david f Fri Nov 08, 2013 1:04 pm

    That  tooks like a nice one.
    Mine is simpler just red and green LEDs for each cell.

    Presumably the display gives the total voltage which isn't all that useful, because you will find that cells discharge at different rates and what is useful to know  is when the first cell goes "red".

    But if that unit gives individual cell indications and a total voltage that should do nicely.

    And yes why not save the flexible friend.

    ESCs for Lipos seem to be expensive and are still far from perfect for submarines, in my opinion.

    David

    PS Just been having a look at the unit you gave the link for. You can get individual cell voltages but it mentions a push button. You may not want to undo loads of bolts to push a tiny button?!
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    Tom(ADMIN)
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  Tom(ADMIN) Fri Nov 08, 2013 2:44 pm

    I've just ordered one, so we'll soon see what they are like, David...at a penny shy of £4.00 it'll hardly cause my flexible friend to break out into a sweat.

    If it's ok, I can mount it under the access hatch on the box lid so I can see it.



    Richard
    Giovanni LiCalsi
    Giovanni LiCalsi
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    ESC for a LiPo pack? Empty Re: ESC for a LiPo pack?

    Post  Giovanni LiCalsi Fri Nov 22, 2013 5:18 pm

    You can also find audible plugin battery monitors.

      Current date/time is Thu Jul 29, 2021 11:35 pm