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Barrow in Furness MBC regatta and submarine event, Sunday 22nd Sept 2019,10am

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Latest topics

» Bournville - September 2019
1:120 Spanish S-80 submarine EmptyTue Sep 17, 2019 4:54 pm by timgarrod

» New Owner of Sheerline Sub's
1:120 Spanish S-80 submarine EmptyTue Sep 17, 2019 4:28 pm by david f

» upgrading the SSY 1/96 ALFA kit
1:120 Spanish S-80 submarine EmptyTue Sep 17, 2019 8:17 am by merriman

» 2019 fun-run at Groton submarine base
1:120 Spanish S-80 submarine EmptyFri Sep 13, 2019 2:50 pm by merriman

» Model Boat Convention 2019 (Haydock Park)
1:120 Spanish S-80 submarine EmptyFri Aug 30, 2019 9:27 am by david f

» 1:72 U boot Scratch built
1:120 Spanish S-80 submarine EmptyWed Aug 28, 2019 12:30 pm by JuanGg

» 1:120 Spanish S-80 submarine
1:120 Spanish S-80 submarine EmptyWed Aug 28, 2019 12:06 pm by JuanGg

» Thank You To Grantham Model Boat Club
1:120 Spanish S-80 submarine EmptyTue Aug 13, 2019 5:39 pm by timgarrod

» Grantham Car pass
1:120 Spanish S-80 submarine EmptySat Aug 10, 2019 7:56 am by david f

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    1:120 Spanish S-80 submarine

    avatar
    JuanGg

    Posts : 11
    Join date : 2017-05-03
    Location : Spain

    1:120 Spanish S-80 submarine Empty 1:120 Spanish S-80 submarine

    Post  JuanGg on Sat Aug 24, 2019 12:09 pm

    Following my previous 3d printed submarine (here), this is the new model, now capable of static diving.

    The S-80 class submarines, still under construction for the Spanish navy, have been elongated due to technical problems. This model, at 1:120 scale, is of the original project.
    The hull was modelled in Fusion 360 using photographs found online and some rather vague lateral and top views found on related publications.
    1:120 Spanish S-80 submarine Capture3
    1:120 Spanish S-80 submarine Capture4
    Then, it was 3d printed in grey ABS and acetone-welded together.
    1:120 Spanish S-80 submarine IMG_20190623_163155_705
    1:120 Spanish S-80 submarine IMG_20190623_212300_224
    The WTC, housing all the control electronics, servos, pumps, and propulsion motor is made out off a convenient water bottle I found at a local shop. All movements are magnetically coupled to the exterior, and two tubes go out through the end cap, one housing the antenna and another to a external balloon, the bladder of the RCABS.
    1:120 Spanish S-80 submarine IMG_20190615_132634_225
    1:120 Spanish S-80 submarine IMG_20190629_185805_409r
    The pumps and solenoid needed for mentioned system are controlled by the circuit below: By means of some op amps and passive components, the pulse width of the PPM signal from the received is turned into a voltage, which then goes to some comparators that in turn control the pumps and solenoid via a couple transistors. It could have been done with a microcontroller, but perhaps this can be simpler.
    1:120 Spanish S-80 submarine Capture

    Here is a summary video of the build:



    All files for the 3d printed parts and a couple drawings are available here.
    david f
    david f
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    1:120 Spanish S-80 submarine Empty Re: 1:120 Spanish S-80 submarine

    Post  david f on Tue Aug 27, 2019 10:50 am

    Hi Juan,

    A very interesting project you have presented - with some pointers for the future of the hobby?

    How long did the build take and any idea of the the total cost?

    (You may have achieved a compromise between the "spend several years building it" or "spend hundreds of £ buying it" options. Twin problems for our hobby.)

    Many thanks for posting and I also think that the circuit using a single op-amp is very neat!

    David
    salmon
    salmon
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    1:120 Spanish S-80 submarine Empty Re: 1:120 Spanish S-80 submarine

    Post  salmon on Tue Aug 27, 2019 2:02 pm

    Excellent build and information, thank you for posting!


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

    Posts : 11
    Join date : 2017-05-03
    Location : Spain

    1:120 Spanish S-80 submarine Empty Re: 1:120 Spanish S-80 submarine

    Post  JuanGg on Wed Aug 28, 2019 12:06 pm


    It took me about a month (on holidays) to design and build the model, except the hull shape, which I've had for almost a year waiting to be turned into something. Meanwhile, I've been working on my wooden U-Boot for 4 years, and it still needs some work. It's quite a contrast.

    On monetary matters, everything came from previous projects and such, but say 20€ for the 3d printed hull, another 20 for the radio receiver, servos, and ESC, and 20 more for pumps, dc motor, magnets, pushrods etc. That makes for 60 € or around 50 £.

    There are some design decisions I'm not very proud off, and it needs a more robust bladder. We'll see.

    Thanks for the kind words.

      Current date/time is Fri Sep 20, 2019 12:50 pm