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



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*STOP PRESS* Coronavirus. A lot of Clubs have already cancelled all activities. Check carefully before you plan any travel

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CANCELLED because of coronavirus. Papplewick Pumping Station, Nottingham, Sunday 12th & Monday 13th April
CANCELLED because of coronavirus. Bournville Sub Day, Sunday 10th May 2020

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Submarine, Boating & Sailing Weekend, Norwich MBC, Weekend of 25,26th July

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Model Boat Convention, Haydock Park (Cancelled this year)

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Bournville Sub Day, Sunday 13th September

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Club Submarine Regatta, Furness MBC, Barrow in Furness, Sunday 20th Sept 2020

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» British Submarines in Two World Wars by Norman Friedman publ by Seaforth.
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    RC for Submarines

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    Cormorant

    Posts : 2
    Join date : 2020-03-06
    Location : Worcester UK

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    Post  Cormorant on Fri Mar 06, 2020 2:42 pm

    Hello. I am new to both this website and submarines.
    It has been suggested by Fred that I seek out david f, who is the man with most of the answers.
    I have been told that 2.4ghz will not penetrate water so it is no good, but Fred disagrees.
    I have a Taranis FrSky x9d which I use for my surface fleet and my question is, can I modify this for subs?
    Thanks
    Steve
    salmon
    salmon
    AMS Forum Owner

    Posts : 296
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    Age : 60
    Location : Las Vegas, Nevada - USA

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    Post  salmon on Fri Mar 06, 2020 3:57 pm

    Those that are using 2.4GHz must keep a part of the antenna above the surface. Usually it is put in a scope or semi scale sub antenna to hide it. If you want to travel completely underwater, you will need to go with a MHz frequency legal in your area.

    Anyways, Welcome aboard. What sub are you looking to build?


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    If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.
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    Cormorant

    Posts : 2
    Join date : 2020-03-06
    Location : Worcester UK

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    Post  Cormorant on Fri Mar 06, 2020 5:18 pm

    Ah, not as easy as I thought then. Best I go for 40mhz?
    I had my heart set on a Uboat type VIIc, but it's now a toss up between that and the British 'S' class - I'm siting for details of a second hand 'S' class.
    I have, up to now, built surface warships, but my wife says my fleet is clogging up the garage so I must get rid of a few, hence the VIIc.
    BTW, what's a BBCode?
    salmon
    salmon
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    Post  salmon on Fri Mar 06, 2020 11:06 pm

    BBCode is a bulletin board markup code. So any formatting (like making letters bold) uses BBCode.


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    tsenecal
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    Post  tsenecal on Tue Mar 31, 2020 5:54 am

    Cormorant,

    the FrSky Taranis x9d does have one option available to it that i have been using for the last two years. it works well, but not as good as a 40mhz setup would work.

    FrSky makes a transmitter module that plugs into the back of the x9d, as well as several different receivers...

    these are made for long range drone flying, but, as i have said, i have been using them exclusively for my model submarines for the last two years (everything else r/c uses 2.4ghz)

    https://www.frsky-rc.com/product/r9m-2019/
    https://www.frsky-rc.com/product-category/receivers/900mhz-r9/

    these use 915mhz for USA, and 868mhz for europe.

    I personally own two of the r9m modules, and the following receivers:
    2 original r9 receivers
    2 original r9 slim
    3 original r9 mini

    although most of these receivers have been replaced with newer models, I don't think there is a direct replacement for the basic r9 receiver, which is kind of a shame.
    Hermann
    Hermann
    AMS member

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    Location : at home, near Bremen (Germany)

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    Post  Hermann on Sat Apr 04, 2020 11:33 am

    Hello,

    due to my own experience the "historical" 40MHz frequency band is still recommended for Radio control of model submarines when you want to dive somewhat deeper and not only to submerge close beneath the surface. Depending opon the electrical conductivity of the water (sweet water) Radio control contact can be maintained up to several metres depth, mostly sufficient to go down to the bottom of pools of public swimming baths as you can see in the following Videos taken of my class 212a submarine and from on board of my old class 206a submarine.




    In seawater of course it is quite different and contact will be lost very soon when the model is beneath the surface.

    27MHz is an alternative but I don't know whether these "historical" RC frequency bands will be longer allowed for RC purpose in future as the majority of RC modellers has changed to 2.4GHz since years.
    david f
    david f
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    Post  david f Today at 10:39 am

    Hi Hermann,

    Good to hear from you and I hope you are all well in these difficult times.

    You are right. Technically the lower the frequency the better, with 40 Mhz coming a close second to 27 Mhz.

    In practice the selection is a compromise between technology, available equipment and regulations.

    Tim Senecal has offered up more choice by pioneering openLRS on 433/458 and 900 MHz. I have been using openLRS on 458 for several years now and I wouldn't use anything else now. The availability of telemetry is a considerable bonus (now that I have got it working reliably for me.) (See other thread posted today.)

    Lovely pool shots, by the way. I can confirm that 459MHz gives up the struggle at the bottom of a typical swimming pool. (Don't forget to set your failsafes!)

    Keep well!

    David

      Current date/time is Tue Apr 07, 2020 2:26 pm