Project Atlanta - Fastgun CL

Discussion in 'Warship Builds' started by SteveT44, Oct 27, 2017.

  1. SteveT44

    SteveT44 Well-Known Member

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    The Atlanta has some mags. Was sweating this part as they have some tight bends in them. After a couple of hours with a heat gun and several failed efforts in the trash can, I've got two good mags.


    Tightest bends to date in this 500psi nylon tubing.

    upload_2017-12-19_10-15-25.png

    upload_2017-12-19_10-15-46.png

    ...
     
    Last edited: Dec 19, 2017
  2. Beaver

    Beaver 2020 Rookie of the Year Admiral (Supporter)

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    For some reason I thought you were going to put the mags in the uptube port and have the uptube coming out of the mag port, guess not. :)
    This has definitely been one of the most interesting builds on this site for a while. Can't wait to see more progress!
     
  3. NASAAN101

    NASAAN101 Well-Known Member

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    She's a 2.5init ship.
    Nikki
     
  4. djranier

    djranier Well-Known Member

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    So applying heat to the plastic tubes did not change the 500 PSI rating on the plastic tubes? That may be looked at as a safety issue, how can we be sure it wont blow pond side? A Remember what happened with the PVC expansion chambers?
     
  5. Beaver

    Beaver 2020 Rookie of the Year Admiral (Supporter)

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    huh? Heating the tubing slightly to form it won't change its pressure rating much, if at all. Certainly not enough for it to rupture, that's for sure. And the stuff is rated for 500psi! Most airlines in our boats are only rated to 145psi and they have constant pressure in them, not the split second pressure that a gun experiences. I'll bet you see more airlines bust than you'll ever see one of these nylon magazines and nobody seems that concerned about airlines being a safety hazard.
    Just my two cents. :)
     
  6. djranier

    djranier Well-Known Member

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    That's not a slight bend, as he stated he had to try multiple times. I really don't care, I will make sure I'm not standing by it. The rules do say not to modify manufactured items that are under pressure after all. We have a eboard to make those calls. And heating it will change its pressure rating, I don't know by how much, but something to be looked at.

    Are we not concerned about safety? just my 5 cents. :eek:
     
  7. Beaver

    Beaver 2020 Rookie of the Year Admiral (Supporter)

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    That's for the high side, not past the regulator. The rules are clear about that.
    Part 1 - E.2
    "Items on the low-pressure side of the regulator do not need to be commercially manufactured or certified."

    Yes, safety is our highest priority. We all want to go home with our appendages intact and both eyes working. I don't see an issue with this though. If you're really worried buy some of the tubing and see what the failure point is after heating and bending it some. Personally, I give those mags a 1 in a million chance of failing due to pressure and even then I doubt it would be so catastrophic as to be a serious safety concern.
     
    Last edited: Dec 19, 2017
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  8. djranier

    djranier Well-Known Member

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    No you are right, i was not thinking right about it, it is the low pressure side, so no problem.
     
  9. SteveT44

    SteveT44 Well-Known Member

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    I understand the concerns. Working with this tubing has been an incremental process. I have a couple of bends in my Barham which are almost as tight and they are holding well. In any case, the cannons will be static tested to 200psi once complete just to make sure.

    upload_2017-12-20_4-48-25.png
     
  10. djranier

    djranier Well-Known Member

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    No problem Steve, I have seen 2 different instances where the low pressure side has had catastrophic failures, due to regulator issues of course in both instances. After the failure both times the side of the ship was about de-sheeted, and the brass fitting on the end of the magazine was not found in either instance, why I mentioned it. Safety first.
     
  11. S-116

    S-116 New Member

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    Good Morning Steve
    Thanks for the great build love it
    Question I have just started my PE and was looking at the scale weight for her, 14.85 to 16.34 pounds.
    I see the Atlanta is only 9.08 .
    Am I reading the information correctly, I known the PE and all German ships are heavy but this seems very heavy
    Thanks for any help you can give me
    Bill
    Athens Ga.
     
  12. NASAAN101

    NASAAN101 Well-Known Member

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    Bill,
    let me know what you start on Eugen! I love that old lady!!
    Nikki
     
  13. S-116

    S-116 New Member

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    Nikki
    She is a hot girl
    I have just stated her going to pond tomorrow to find the water line then cut out the ribs order parts
    Bill
     
  14. SteveT44

    SteveT44 Well-Known Member

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    Bill,

    The Princz Eugen is a heavy cruiser and the Atlanta is a light cruiser. That's what accounts for the weight difference.
     
  15. S-116

    S-116 New Member

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    Thanks will water test her (for the water line),her tomorrow at the pond,won’t fit in tub HaHa. With 15 pounds
    Again thanks
    Bill
     
  16. NASAAN101

    NASAAN101 Well-Known Member

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    BIll,
    she's a great ship. ask everyone on here what she mean to me!!!
    Nikki
     
  17. Anvil_x

    Anvil_x Well-Known Member

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    I presume you have a Scharnhorst? do you fight her like a cruiser or what?
     
  18. NASAAN101

    NASAAN101 Well-Known Member

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    no, i went one tho :D
    nikki
     
  19. Anvil_x

    Anvil_x Well-Known Member

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    ah. gotya. (Tangent over, lol)
     
  20. SteveT44

    SteveT44 Well-Known Member

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    I'm doing something unorthodox with the cannons. I was going to keep this under wraps but I think I'd rather show it off! :cool:

    Yep, two forward facing 15 degree offset cannons in the Atlanta's wing turret locations.

    upload_2017-12-29_7-27-36.png


    Max length tight tolerance barrels and long smooth flow up tubes should ensure maximum hitting power.

    upload_2017-12-29_7-28-21.png


    And the magic underneath.

    upload_2017-12-29_7-29-31.png

    upload_2017-12-29_7-29-59.png

    upload_2017-12-29_7-30-27.png


    The cannon assembly comes off easy. Just unhook the uptubes and pull the coils off, and it slides forward off mount.

    upload_2017-12-29_7-31-27.png

    upload_2017-12-29_7-31-54.png


    Barrel ends will be 3/4" off the water with a slight downward angle.

    upload_2017-12-29_7-32-53.png



    This setup is obviously designed for side swiping attacks on targets of opportunity. If it proves totally fubar, it will be easy enough to bend those uptubes back and mount conventional dual sterns.

    ...
     
    Last edited: Dec 30, 2017
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