The Association of Model Submariners.

Would you like to react to this message? Create an account in a few clicks or log in to continue.

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



Join the AMS - Registered Forum users can become members of the AMS and it's free ...... To join send an email with your name , address and phone number to amstreasure@googlemail.com


For a guide to past events see the "Shows and Events" section.

Papplewick Pumping Station SUBMARINE Day. 31st March - 1st April 2024.

$$$

&&&

::::

Who is online?

In total there are 3 users online :: 0 Registered, 0 Hidden and 3 Guests

None


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

Latest topics

» Information on camouflage patterns for German seahund
New project - USS Nautilus - Page 3 EmptyFri Mar 15, 2024 4:36 pm by david f

» WW2 mini sub build
New project - USS Nautilus - Page 3 EmptyTue Mar 12, 2024 1:56 pm by geofrancis

» Not the hobby I expected :)
New project - USS Nautilus - Page 3 EmptySun Mar 10, 2024 6:30 pm by cat

» 868/915 Mhz as a viable frequency for submarines.
New project - USS Nautilus - Page 3 EmptyWed Mar 06, 2024 4:50 pm by tsenecal

» Sheerline gasket material
New project - USS Nautilus - Page 3 EmptyMon Feb 19, 2024 9:24 pm by Michaelc

» Choice of CAD software and Printer for 3D printing
New project - USS Nautilus - Page 3 EmptyThu Feb 15, 2024 1:53 pm by david f

» Engel Nautlus
New project - USS Nautilus - Page 3 EmptyTue Feb 13, 2024 9:15 am by palmert6

» RF 27/433MHz maximum depth in pools (1-5 ppm chlorine, 6-8pH)
New project - USS Nautilus - Page 3 EmptyThu Feb 08, 2024 2:05 pm by david f

» Arduino proportional control of a piston tank
New project - USS Nautilus - Page 3 EmptyThu Feb 08, 2024 1:37 pm by david f

Statistics

Our users have posted a total of 12425 messages in 1980 subjects

We have 1005 registered users

The newest registered user is Les

+7
Dr.Schmidt
salmon
profesorul
Hermann
merriman
acrowot (Geof)
david f
11 posters

    New project - USS Nautilus

    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Mon Jan 19, 2015 5:35 pm

    The decks and a few smaller parts are going to be photo etched. Hell of a work to draw all that.....
    New project - USS Nautilus - Page 3 Etch_zps5cd71dc1
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Mon Jan 26, 2015 8:43 pm

    Small update. The moulds for the hull are done and only minor adjustments have to be added. The moulds for the sail will be ready by end of the week...hopefully. And to avoid boredom, I've started to fabricate the silicone moulds for the smaller pieces. All cast in PU resin:


    top of the sail, mast support, bridge, sonar dome, hatches etc.

    New project - USS Nautilus - Page 3 IMGP0201_zps09b111da

    Hatches:
    New project - USS Nautilus - Page 3 IMGP0204_zpsc95b04cc

    And again the lid of the sail:
    New project - USS Nautilus - Page 3 IMGP0205_zpsbb713907
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Thu Jan 29, 2015 8:10 pm

    Well, the moulds for the sail....done.

    New project - USS Nautilus - Page 3 29012015097_zpse96ccd4e
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sat Feb 07, 2015 4:51 pm

    O.K., getting the first parts out of the new moulds. The sail is laminated and in its vaccum sack.

    New project - USS Nautilus - Page 3 07022015100_zpsdfbb8b03
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sun Feb 08, 2015 9:23 am

    The design is getting close to finalization as well.....
    New project - USS Nautilus - Page 3 Nautilus_zps065dd5e7
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Wed Feb 11, 2015 8:45 pm

    The first sail is out of the mould. Not that bad and the resin-cast cover fits quite perfectly:

    New project - USS Nautilus - Page 3 IMGP0207_zpsd442df12

    New project - USS Nautilus - Page 3 IMGP0209_zps916e3e5d

    The moulds for the aft control planes are ready as well:

    New project - USS Nautilus - Page 3 IMGP0211_zps4e621654
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Mon Feb 16, 2015 6:00 pm

    The bow:

    New project - USS Nautilus - Page 3 IMGP0213_zpsa1f0ec99

    New project - USS Nautilus - Page 3 IMGP0214_zps42b98ccd

    New project - USS Nautilus - Page 3 IMGP0215_zps2ee92a63
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sat Feb 21, 2015 9:01 am

    New project - USS Nautilus - Page 3 Interior_zps641f92f1
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Thu Feb 26, 2015 10:03 pm

    Got the stern section out of the mould....
    New project - USS Nautilus - Page 3 IMGP0218_zpsumvtqq9u
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Wed Mar 04, 2015 9:38 am

    Design is finished. With a bit of luck I'll have some photos of the real mdel (raw assembly) by Saturday.

    New project - USS Nautilus - Page 3 Nautilus_zpsntldspvo
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Wed Mar 04, 2015 9:47 pm

    Getting there:
    New project - USS Nautilus - Page 3 04032015111_zpscjdq7p5h
    david f
    david f
    AMS Treasurer


    Posts : 2395
    Join date : 2010-11-10
    Age : 73
    Location : Cumbria

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  david f Thu Mar 05, 2015 8:52 am

    Looking very good, Andreas!

    David
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sat Mar 14, 2015 3:44 pm

    First set of milled structure parts arrived and it looks quite good:
    New project - USS Nautilus - Page 3 DSC01866_zpsvk7kyuiq
    New project - USS Nautilus - Page 3 DSC01869_zpscw2uvtn1
    New project - USS Nautilus - Page 3 DSC01871_zpsernas30s

    And as I had the pleasure to spend last week sick at home I tried what my CAD offers in terms of making sketches for build instructions…...looks good:

    New project - USS Nautilus - Page 3 Heckframe_explode_zpst7hjuiya
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sat Mar 21, 2015 4:16 pm

    Even if it doesn't look like it.....this is going to be the mould for the rear bulkhead:

    New project - USS Nautilus - Page 3 21032015113_zps9c6rlr20
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sat Apr 04, 2015 1:16 pm

    This will be the motor feed through of the Nautilus. Basically it's an advanced version of the ones I have in my U-1. Took a while to find a workshop that is now doing the parts. I guess I'll make some more.... The parts will be made of bronze and brass, it will have a ball bearing and an ID 4 mm rotary shaft seal. It will be attached to the rear bulkhead via a simple M16 fine thread and sealed via an o-ring. Advantage: only one hole in the bulkhead, no additional holes that have to be sealed. And it saves so much space in your boat....

    New project - USS Nautilus - Page 3 Subdrive_zpsrbvkcfvm
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sat Apr 04, 2015 1:27 pm

    And the first half of the mould for the rear bulkhead...
    New project - USS Nautilus - Page 3 04042015116_zpsvxa5vl12
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sat Apr 04, 2015 5:54 pm

    decks have arrived.....eastern present ;-)

    New project - USS Nautilus - Page 3 DSC01877_zpssyq58sm0

    New project - USS Nautilus - Page 3 DSC01880_zpsviunhgd0

    New project - USS Nautilus - Page 3 DSC01883_zps7q0cav9j

    New project - USS Nautilus - Page 3 DSC01884_zpsafaoxenk

    New project - USS Nautilus - Page 3 DSC01885_zpsjck0mhtd
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sun Apr 12, 2015 8:50 am

    The moulds for the rear bulkhead are done...
    New project - USS Nautilus - Page 3 11042015121_zpsfhlwa1vs

    And the first part has turned out quite nicely. Notice the round flat surfaces that will help to seal the motor fedthoughts.

    New project - USS Nautilus - Page 3 11042015122_zpszl6bsb4a
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sat Apr 25, 2015 4:40 pm

    I've decided to make the watertight main section out of glass fiber, too. Attaching the deck to a plexiglas tube works, I've tried it successfully. But one has to fill the transition with filler and that is a) an annoying work and b) the result is, compared to the exact and sharp lines of the bow and stern, sub standard. So I have prepared the respective CAD files and ordered the milling of the preforms......

    Hermann
    Hermann
    AMS member


    Posts : 119
    Join date : 2011-07-03
    Location : at home, near Bremen (Germany)

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Hermann Sun Apr 26, 2015 5:11 pm

    Dr.Schmidt wrote:I've decided to make the watertight main section out of glass fiber, too. ...

    ...so you think about a GRP tube instead of the plexiglass tube, I suppose. I know that there are glassfiber reinforced plastic tubes available for industrial purpose (e.g. for chemical applications), maybe a "Standard" gauge might fit for your dimensions. A submarine modeller colleague from Bremerhaven had got such a tube (but of much bigger size) for his model of class 212A in scale 1:30.
    Otherwise laminating a GRP pressure hull tube by your own is also an annoyoing work....
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Sun Apr 26, 2015 5:42 pm

    No, no gpr tube. The whole middle section is going to be one piece made out of glass fiber. Pretty much like that...

    New project - USS Nautilus - Page 3 Mitte_zpsilupl38f
    Hermann
    Hermann
    AMS member


    Posts : 119
    Join date : 2011-07-03
    Location : at home, near Bremen (Germany)

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Hermann Mon Apr 27, 2015 10:39 pm

    ...but you know that your deviation from the ideal circular shape of the cross section of your presure hull will result in a more or less reduced pressure resistivity. Compared to a cylinder a hull with a cross section shape like this will buckle more easily (also resulting in loss of buoyancy), the hull structure will be less stiff. Well, if you increase the wall thickness and don't plan to dive a little deeper than a few meters this might be still ok (I assume you might calculate pressure resistivity by FEM).
    In addition you must also consider that the space just beneath the deck (that should be above the water surface when the model is surfaced) is no free flooding area any more and so it develops more buoyancy when submerging. This must be compensated by more ballast.
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Tue Apr 28, 2015 7:38 am

    All valid Points.

    Stability - no, I didn't do FEM simulations. But I'm pretty sure that this is not going to be a major problem. The deck only represents a minor deviation from the cylindrical shape. It's Elevation above the cylinder is not high, just about 1 cm. So laminating a 2 mm thick hull with a 3 mm deck and about 4 mm GPR at the seams (were you have twice the 2 mm) will most probably be sufficient. I'll have a Engel pressure switch, so the diving depth should not exceed 2 m = 200m mbar. Should be feasible.

    Buoyancy - true, but actually I do not know if the extra  buoyancy  will help or cause problems. That's to be tested. I plan with a 750 ml Engel tank in a 61 cm long 10 cm diameter hull. That's less volume than e.g. in Engels 212a. It will definitly add roll stability when the boat is submerged. And: I'll have both Options if the full hull does not work.
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Tue Apr 28, 2015 10:29 am

    Hi Hermann,

    thanks for challenging me with this discussion. You made me think and I actually had a great idea how to alter the design of the gpr main hull so that the buoyancy Problem becomes minimized and also the stability problem will be reduced. I'll post a picture later today......

    Cheers Andreas
    avatar
    Dr.Schmidt
    Guest


    Posts : 171
    Join date : 2013-03-20
    Location : Germany, Bavarya

    New project - USS Nautilus - Page 3 Empty Re: New project - USS Nautilus

    Post  Dr.Schmidt Tue Apr 28, 2015 9:05 pm

    This is how it's going to be. I can minimize the additional volume of the deck by making a trench in the structure that will be free flooding. The trench will also enable the flooding of the sail and it will connect the free flooding stern and bow sections. The photo-etched brass deck will get cuts that help venting the trench. The bridge structures help to ensure that the deck does not bend. The remaining left and right bump of the deck superstructure will be filled e.g. with resin and microballoons. This makes it possible to lay down the glass fiber in an almost perfect circular shape, restoring the full strength of a tube structure.

    New project - USS Nautilus - Page 3 Newdeck_zpspn9horeq


      Current date/time is Thu Mar 28, 2024 2:49 pm