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» 27Mhz - Radio Ideas
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» Grantham Model Sub Day, Sunday 14th August 2022
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» 915mhz / 868mhz as a viable frequency for submarines.
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» Sheringham 2022
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» JSN-SR04T Depth sounder
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» lego submarine with automatic depth control.
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New project - USS Nautilus - Page 2 EmptyMon Jul 18, 2022 3:29 pm by david f

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    New project - USS Nautilus

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    Post  david f Wed Oct 22, 2014 4:01 pm

    Hi Andeas,

    What sort of brushless motors do you intend to use?

    I say this because one of the things that seems to limit their use in submarines is:

    - tend to be very high revving (gearboxes!!?)
    - too many to choose from.

    I asked a similar question to the Sonar members at the Dortmund show and they said that they tend to have them specially wound.

    Are there easily commercially available brushless motors which would do the job?

    For example, how about this one :

    3508-380KV Turnigy Multistar 14 Pole Brushless Multi-Rotor Motor With Extra Long Leads

    http://www.hobbyking.com/hobbyking/store/__41615__3508_380KV_Turnigy_Multistar_14_Pole_Brushless_Multi_Rotor_Motor_With_Extra_Long_Leads.htmlCUR=GBP&LOC=GB&LAN=ENG&gclid=CIi5u7PBwMECFabLtAodhx0AhA

    I have never used a brushless in a submarine yet but this looks compact and low revving because it is multi pole.

    David
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    Post  Dr.Schmidt Wed Oct 22, 2014 4:29 pm

    ROXXY© BL-Outr. C35-30-45 300kv

    or

    ROXXY® BL-Outr. C35-29 500kv

    The 35-29 ones are driving my U-1

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    Post  david f Thu Oct 23, 2014 9:59 am

    Thanks for the information, Andreas.

    So that it is a 14 pole motor which will be doing only 3000rpm at 10v.

    Also very small - I am beginning to see the attractions of brushless!

    David

    http://www.robbe.de/roxxy-bl-outr-c35-30-45-300kv.html


    Last edited by david f on Thu Oct 23, 2014 1:18 pm; edited 1 time in total (Reason for editing : Added Robbe link)
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    Post  Dr.Schmidt Thu Oct 23, 2014 10:26 am

    It's all about the size. Also my self-designed water-tight feed through saves allot of space in the interior of the wtc, as it moves the motor right to the stern bulkhead. The complete length of the wtc with a 750 ml Engel piston tank is only about 60 cm.

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    Post  Dr.Schmidt Sun Oct 26, 2014 7:50 pm

    The CAD files for the milling of the moulds are getting ready:

    New project - USS Nautilus - Page 2 Moulds_zps5de098e7
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    Post  Dr.Schmidt Fri Oct 31, 2014 5:20 pm

    Small stuff has to be designed as well......e.g. hatches:

    New project - USS Nautilus - Page 2 Luke_zps10ac518e
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    Post  Dr.Schmidt Sat Nov 08, 2014 3:26 pm

    While waiting for the first milled pre forms for the fuselage, I spent some time drawing details:

    New project - USS Nautilus - Page 2 Sail_zps94c8a74c
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    Post  Dr.Schmidt Sun Nov 09, 2014 8:53 am

    Starts to look like a boat......the small stuff takes extremely long to draw

    New project - USS Nautilus - Page 2 Nautilus_zps0f0f6ace
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    Post  Dr.Schmidt Sun Nov 09, 2014 9:23 pm

    Just got a package......:D

    New project - USS Nautilus - Page 2 DSC01844_zps63ace771

    New project - USS Nautilus - Page 2 DSC01845_zpsc93f919b

    New project - USS Nautilus - Page 2 DSC01846_zps825eceb2

    New project - USS Nautilus - Page 2 DSC01847_zps72c89ddc

    New project - USS Nautilus - Page 2 DSC01848_zps2ef9f5a1
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    Post  Dr.Schmidt Sun Nov 16, 2014 1:04 pm

    Propeller design....

    New project - USS Nautilus - Page 2 Nautilus-2_zps5da9be1e

    New project - USS Nautilus - Page 2 Propeller_zps33089e60
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    Post  david f Mon Nov 17, 2014 8:59 am

    Very nice Andreas!

    The future - we'll just download a CAD/CAM file?

    From our previous discussions, the only remaining problem seems to be the cost and availabilty of the fabrication stage?

    David

    BTW Andreas - I see that you are still a Guest. You can join the AMS now. Just click the link and it's free.
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    Post  Dr.Schmidt Mon Nov 17, 2014 10:13 am

    CAD/CAM definitely expands the possibilities allot. I'm tempted to get the props 3D printen in titanium. Just some polishing and then some proper moulds. Would also be a good route for the mast pre forms.

    What do you mean with guest? I'm a registered forum user.....

    Cheers Andreas
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    Post  david f Mon Nov 17, 2014 10:42 am

    You are indeed!

    Thanks,

    David
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    Post  Dr.Schmidt Tue Nov 18, 2014 9:43 am

    Worked a bit more on the props. Added a real Profile to tha blades and reworked the radius blends. Now I have to figure, if I get them printed in metal or plastic.

    New project - USS Nautilus - Page 2 Prop_zpsc4da0dbc

    New project - USS Nautilus - Page 2 Prop-2_zpsc2040dbc
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    Post  Dr.Schmidt Sun Nov 23, 2014 5:18 pm

    That's about how I envision the upper part of the sail....

    New project - USS Nautilus - Page 2 TurmhaubeundParts_zpsef74a120
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    Post  Dr.Schmidt Sat Dec 06, 2014 5:00 pm

    A glance into the living resin & glass fiber hell.......

    New project - USS Nautilus - Page 2 06122014073_zpsa56e5d24
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    Post  Dr.Schmidt Sun Dec 07, 2014 8:25 pm

    More concept work.....this time the anchor:

    Original:
    https://c1.staticflickr.com/3/2549/3953530408_1ebf3b2d4f_z.jpg

    CAD:
    New project - USS Nautilus - Page 2 Anchor_zps160a655f
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    Post  Dr.Schmidt Sun Dec 07, 2014 8:54 pm

    And on the boat.....

    New project - USS Nautilus - Page 2 Nautilus_zps41f2e9d0
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    Post  salmon Mon Dec 08, 2014 1:48 pm

    Dr.Schmidt wrote:A glance into the living resin & glass fiber hell.......

    New project - USS Nautilus - Page 2 06122014073_zpsa56e5d24
    I have not worked with fiberglass, is that sand being used? Can you tell me what is happening in this photo?
    Thank you!


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    Post  Dr.Schmidt Mon Dec 08, 2014 3:32 pm

    The procedure to make my moulds is as follows:

    You put your pre-form into the sepeartion plane ( if necessary) and then you build these wooden boxes around the pre form. In my case I used plastic coated chipboard for the boxes. Everything is then covered sereveral times with a mould release wax. Then I apply the top coat, wich is a metal filled mould gelcoat (everything blue in the picture a remanents of the gelcoat). Then you let the mould gelcoat set. Next, one laminates about 3 mm of glassfiber into the mould box and fills it with what you called sand (which is pretty close). The sand actually is made of about 2 mm large glass spheres. It's a cheap product called Proaver http://www.poraver.com/en/. It easily mixes with resin, does not need to much of it and then solidifies to a block that can easily be sanded but can take the perssure of screw clamps. Finally you sand the proaver to a flat plane and seal the mould again with about 3 mm of glass fiber. This way you get a closed box wich is very stiff, easy to clean and will stay straight, evene when clamped together.
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    Post  Dr.Schmidt Tue Dec 09, 2014 8:25 pm

    First tool done....upper half of the bow:

    New project - USS Nautilus - Page 2 09122014077_zpsf777d0f1

    New project - USS Nautilus - Page 2 09122014076_zps5d59020f
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    Post  Dr.Schmidt Sun Dec 14, 2014 12:30 pm

    More mould making mayhem

    bow - lower half:
    New project - USS Nautilus - Page 2 14122014082_zps39286611

    bow complete:
    New project - USS Nautilus - Page 2 14122014084_zpsdc2b7735

    deck - main mould:
    New project - USS Nautilus - Page 2 14122014083_zps22ea856f
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    Post  Dr.Schmidt Thu Dec 18, 2014 5:13 pm

    The last milled pre-forms. The conning tower....
    New project - USS Nautilus - Page 2 DSC01850_zpsb0f48ad3
    New project - USS Nautilus - Page 2 DSC01852_zpsc7018b98

    And the rudders:
    New project - USS Nautilus - Page 2 DSC01853_zps89eec84a
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    Post  Dr.Schmidt Sun Dec 21, 2014 8:34 am

    That's the current status of the design....

    New project - USS Nautilus - Page 2 Nautilus_zpsee712aa4
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    Post  Dr.Schmidt Thu Dec 25, 2014 12:31 pm

    Right in time for Christmas I got a big package full of 3D-printed parts:

    Propellers - turned out really good, even the profiles. Excellent for only 28 mm diameter.
    New project - USS Nautilus - Page 2 IMGP0177_zpsfe791d76New project - USS Nautilus - Page 2 IMGP0176_zps28bce2c4
    New project - USS Nautilus - Page 2 IMGP0175_zps1d741281


    Stern bulkhead - notice the 7° kink for the tilted prop axis:
    New project - USS Nautilus - Page 2 IMGP0181_zpsd56d59c0
    New project - USS Nautilus - Page 2 IMGP0180_zpsb84b22f2

    deck hatches:
    New project - USS Nautilus - Page 2 IMGP0178_zpsffa4711f

    Sail cover, bridge, mast housing and small parts like periscopes:
    New project - USS Nautilus - Page 2 IMGP0166_zpseca79474
    New project - USS Nautilus - Page 2 IMGP0168_zps0182f3e6
    New project - USS Nautilus - Page 2 IMGP0169_zpsef934caf
    New project - USS Nautilus - Page 2 IMGP0170_zps684f1480
    New project - USS Nautilus - Page 2 IMGP0171_zps86b62953
    New project - USS Nautilus - Page 2 IMGP0173_zpsb6c0512f
    New project - USS Nautilus - Page 2 IMGP0174_zps7d01bffa

    That's going to be plenty of work to make moulds for all these parts.....

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