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Imagine-A proper underwater Screw Pattern.

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  • Member since
    October 2019
  • From: New Braunfels, Texas
Imagine-A proper underwater Screw Pattern.
Posted by Tanker-Builder on Wednesday, October 30, 2019 8:36 AM


       This is for you folks out there that would like to make an on/underwater dio. I got this idea from messing with a two level LEGO display again! Normally, we see a ship or tug or whatever going along and see some very interesting wake patterns.

     Now here's the way to add some more interest. Got any .010 Clear sheet? Take a small piece for experimenting. Roll it around a drill bit close to the size of your ship's screws. Make sure the edge facing the drill surface is facing the right way so you won't have a screwed up mess of plastic and a cut hand!

      Take the drill and employ it slowly watching the pattern develop as you pull the drill bit out of this tube. Hmm, Looks like the edges of a screw's thread doesn't it? If it doesn't then you will need to squeeze harder as you pull out the slowly turning drill bit.

       Do this till you are satisfied. Then do this. When designing to view box for the underwater part make sure the Plastic sheet in the front is clear with a very slight dullness to the clarity. You don't want folks to notice this but, it should be there.

      Why? Well if everything is Perfectly clear you will notice the end of the screw pattern tube. This you don't want. Oh,You can also use a little bit of pillow stuffing spun slowly with the same drill and spray the results with hair spray. Instead of the plastic tube.

      I just found the plastic sheet more workable. For the effect of the ship hull moving through the water you take verl tight rolls of stffing soaked in hair spray and fasten it at the bow and along the sides in the appropriate amount.The underwater part of the Bow wave isn't as noticeable but it's still there.  Same for the surface wake!

   Now, there is some situation going on under and around the stern. This can be represented in the lower  light of the below water area with very fonely stretched cotton. Almost combed to non-existance and hairsprayed for low visibility.

        Give it a try. It will take a while,but a whole new world of underwater happenings can then be done. A Sub Firing a torpedo? Who Knows?   T.B.  

  • Member since
    November 2015
Posted by STOVK on Thursday, November 7, 2019 12:33 PM

I think I need an illustration or some photos. I'm not getting it. Sorry.

  • Member since
    July 2014
Posted by modelcrazy on Thursday, November 7, 2019 12:56 PM

I think I get it, the plastic that climbs up the drill as you drill the clear plastic. If that's not what you're talking about, what I thought you were talking about sounds like it would work 

Either way, I would need to come up with a reason to have an underwater scene. I can think of a few, I would just need a reason for ME to have an underwater scene.


Building a kit from your stash is like cutting a head off a Hydra, two more take it's place.

  • Member since
    June 2014
  • From: New Braunfels , Texas
Posted by Tanker - Builder on Friday, November 8, 2019 10:29 AM


    The best illustration I can recommend is one that shows how a propeller behaves in the Water. Most books about boats and propeller types would have it. I don't know how to post diagrams or such here.

  • Member since
    June 2014
  • From: New Braunfels , Texas
Posted by Tanker - Builder on Friday, November 8, 2019 10:35 AM


    Pretty close. Why does the plastic climb up the bit? The rotating action of the drill makes the plastic climb the flutes of the bit. Now, look at a polished chrome Wood Screw. That's the pattern a propeller makes in the water.

   Just like Rotini or an Archimedes screw, same idea. You let the drill back out of a plastic clear tube leaving marks inside of the sharp flute edges in the plastic.

   This will resemble the little bubbles escaping from the very edge of a prop and the subsequent whirlpool action in the wake of the prop. 


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