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USS Thresher

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  • USS Thresher

    This is a bit cart before the horse as they say, would like to present my hull in its weathered state for inspection and comment. The WTC will follow later.

    The white/grey streaking has come out more prominent than it is due to the flash. Im not really sure about the scum line though! seems far to perfect!
    Attached Files
    Last edited by Albion; 03-06-2010, 03:03 AM.
    Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

  • #2
    Awful! What the hell happened ... do you apply that stuff with fire-crackers!?

    Way too much paint in the brush for the vertical/radial 'white' streaking. Next time get most of the paint out of the brush on a rag before you drag the streaking onto the hull. And use a big brush for the radial streaking -- I use a four-inch wide house painting brush for just this kind of work, using long, quick downward strokes, with the bristles barely making contact with the model. Looks like you were using water soluble paint. Good. And you shoud follow up the vertical/radial streaking with a spray coat of thinned base color to correct and soften some of the streaking.

    And when you do any involved weathing effect, have a 'test article' (painted cylinder or junk hull) next to you. For example: when you do the streaking, beat most of the paint out on a rag or towel (the wife will love that!) and when you have the brush pretty much dried out, steak first on the test article till you get the strokes and paint content right, then immediately transfer your work to the project at hand. Make your screw-ups on the test article, not the model.

    There is no vertical/radial streaking below the waterline. Only indication of vertical 'weathering' below waterline is where the hull has been rubbing up against camels, fendors or pier pilings. There are horizontal bands near the waterline -- a consiquence of the stratification of waterborn polutants and variations in surface waterline while sitting in port. These are indicated with varying shades of the 'bleaching' white discussed below.

    Your scum line looks like painted on boot topping. Too stark. Should streak and feather from top to bottom and should be a collage of green, brown and a dash of yellow. Mask off the upper hull and work the scum line using oils and/or oil bearing crayon. colored pencils (soft lead) are alos useful here. Below waterline should be a slight overcoat of white to indicate bleaching of all the hull clinging critters that died when the boat is drydocked (most shots of a weathered boat reflect a dried out bottom in drydock, hence the bleaching). A drydocked below waterline hull is bleached out, a light suggestion of green when in the water.

    Nice try. Do it again!

    Below are shots of what a properly weathered submarine looks like. And pay attention to scale -- streaking like yours would be appropriate on a 1/12 scale submairne, not 1/96!

    David,



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    Last edited by He Who Shall Not Be Named; 03-06-2010, 10:34 AM.
    "... well, that takes care of Jorgenson's theory!"

    Comment


    • #3
      I've stood in the corner with my hands on my head, and written a thousand lines, i must not use fire crackers and paint again.

      So how to fix the damage.

      The grey white streaks are indeed water based, will it come off so i can avoid a respray
      Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

      Comment


      • #4
        LOL. You've taken your smack-down in good humor, and your willing to fix things. Good man! You're trainable.

        Let's rescue this boat:

        Water-soluble paints are only water soluble as long as the binding resin has not polymerized -- which does not happen dill the solvent (water) has left the molecule. Once the water has evaporated out, the cross-linking of the resin changes its state to a solid, now only soluble in harsh solvents that will also attack the underlying paint, primer, fillers and adhesives.

        You're pal!

        Wet sand the entire model with #600 and re-paint the basic above and below waterline colors. Start again.

        Break out an old half-started kit and make that your test article. Get it into the same paint condition as your nice little THRESHER and parallel the weathering tasks between the two: first the test article, where you will refine your technique and choice of mediums; then apply those lesson to the THRESHER. You'll note a vast improvement in the work over your initial attempt, Albion.

        I'm here with help anytime, buddy.

        David,
        Last edited by Kazzer; 03-07-2010, 05:39 AM. Reason: Eating too much chicken = fowl language
        "... well, that takes care of Jorgenson's theory!"

        Comment


        • #5
          God, I wish I could do this sort of stuff----------My paint jobs are always too clean, they look like the boat has just left the paint shop and on the odd occasion that I have tried to put some life into the model it looks as though its just been dragged out of a cow shed. Give me a chunk of brass and I can do something with it, plastic or resin the same but a paint brush
          ---------------well we just don't mix well.
          RonP

          Comment


          • #6
            Well just so you dont think ive given up, here is latest status, been working too much.
            plus there was an intermeadiate paint scheme, where i tried to paint the grey below water line a slightly lighter grey, however it came out too grey, and really my grey to was too light as well, so it all got cleaned off again.

            So now got nice differential between the hull and anti slip area, still need anti slip on sail fins. Need to add the white draft markings, then venture into weathering again. Should i laquer it before weathering?
            Attached Files
            Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

            Comment


            • #7
              Albion,

              Good, good. You jumped back on the horse after that recent nasty fall. OK, you now have a good canvas upon which to paint (weather). Yes, give the model two rather heavy coats of clear -- this will give you the ability to sand off any bad weathering applications without cutting into the base colors, do such sanding with 2400 or 600 grit sandpaper. Look on that ability as you would a pencil eraser abrading away an error you wrote onto a piece of paper, the ability to scrub off markings/bad weathering without harming the substrate.

              Have your test article standing by and perform all proposed operations on it (in small patches) first -- once you have the right mediums and applications techniques down solid on the test article, immediately move onto the THRESHER and lay down the mung.

              Those photos sucked! Put in more hours at work so you can afford a camera that can get into focus!

              David,
              "... well, that takes care of Jorgenson's theory!"

              Comment


              • #8
                The real reason for this thread this as a home made WTC right, not all this namby pamby painting stuff

                First a history lesson
                I was rebuilding the WTC on my Permit into the Mk3, and at the same time cleaning up the hull to make it more presentable, rather than looking like a scruffy toy, which has clearly had a lot of experimentation.

                The existing WTC is what I call the Mk2B, it started life as Mk1 using a 3.5” tube with the motor and servos located in the rear, and a forward section housing the electronics, batteries and a small piston tank. The two areas are separated by a simple centre cap, through which the wires that pass are sealed with silicon, so the aft section (where the rotary seals are located), is not pressurized when ballast tank is filled. Mk2 used my own machined centre cap containing a monocoque piston tank, but had too much material and was far too negative especially at the stern. Mk2B removed some “meat” to increase buoyancy but still is not too good.

                Problems with Mk2b
                1) Still too heavy
                2) The material used did not machine well enough to create a smooth bore for the piston tank, leading to excess friction causing reduced battery life, and also some leakage past the o ring and into the wtc
                3) The 3.5” tubing is really too big for the hull, meaning lack of radial space and the WTC is above water level in surfaced state, so extra tank volume required to offset this.
                4) Piston tank volume not large enough for a scale waterline (see also 3) above).
                5) The Front end cap was never truly fixed to the tubing, it was held on with Tank Tape meaning sailing was limited to pool use in case the internal pressure popped the end off, which it often did after a while.
                6) The Tube was secured to centre cap via radial screws, which caused stress cracks on the tubing.

                Solution
                A) Going back to a tube for the piston tank cylinder.
                B) Increasing the length of the tank.
                C) Using 3” diameter tube for WTC.
                D) Using tie bolts to hold pressurized part together.

                My Xmas Project - machining new custom centre cap. This was finished and all manner of holes drilled and tapped, I now had it ‘equal’ in scope to the previous centre piece. Ok one is 3.5” dia and the other 3” but was shocked by the weight difference as I thought the metal in the studs would offset the lack of ‘plastic’ material, damm Delrin must be dense.
                Original = 397g
                Revised = 200g
                Half the weight! And that is after my removing material, the Mk2 must have been a brick. The smaller WTC tube will mean less buoyancy but it was all going in the right direction. Then I hit a wall I hadn’t planned for, the drive motor for the piston doesn’t fitL. The pulley wheel on the piston shaft is 40mm od and the motor pulley is 9mm. The WTC is 70mm ID. So working from CL I have 35mm height. Large Pulley =20mm, small pulley 4.5mm, that leaves 10.5mm or 21mm diameter drive motor, it currently is 28mm. I was too busy focusing on the piston and wire routing I forgot about this.

                So refocused and worked on the motor mount for end cap, I really like the Engel fittings which I used on the Koryu, so I am using the Engel motor mount which incorporates a seal and bearing. A cut off from an old shaft provides the stub shaft. Using the same servo mounting method as on the Koryu, also the same bellows assemblies for sealing. Only less than perfect part is the through bolts on the end cap which despite having capped nuts will still probably require some sealing.


                Kept looking back at how to fit a drive motor for the piston, when Nuke power (yes He is to blame) posted a how to make a RCABS WTC on another forum (clearly in present company this post should be spat upon and finally tarred and feathered). I had already got one end cap made up with Servo’s and motor, and realized that the components I needed were all in my box. So one Saturday morning I started out with a rough drawing of how to lay out my internals and got to work, by the end of the day, covered in lexan dust and other assorted toxins I finished up with a working item. Inside I have

                Receiver
                3 x standard size servo, two to operate rear planes and one to operate ballast
                Engel motor mount, motor, ball race and seals
                Engel bellows seals and ferrules
                Schrader valve stripped down and soldered to a bracket.
                Motronics ESC
                Air pump
                Subtech leveler
                Subtech failsafe
                7.2V car type battery pack

                I fitted the Switching servo so that it acts as a stop for the battery pack, ie the battery just fits between the front end cap and the servo, so it doesn’t slide about. With this location fixed I then played around with the various bits to get optimum layout, ie hoses not kinking, power wires away from signal, noise generating parts away from receiver, well I did the best I could anyway.

                I cut some lexan sheet so that it closely filled the 3” cylinder at its widest point thus supporting the tray full length without additional fittings. Everything can be installed from the drive end. X on the end cap marks the spot where I want to install a Caswell waterproof switch to complete this.

                The ballast system is connected to a 12” long bladder which sits on top of the WTC between WTC and hull, it’s a tight fit, but provides just enough space to inflate the bag and achieve scale waterline.

                If I did this again I would use a 2.5” cylinder in this hull, maybe a bit longer to allow more volume for filling the bag. The smaller diameter would allow more room for bag to inflate and give even more waterline. Also I would buy (yes I would, but they weren’t available at the time) the D&E end caps, as this would avoid the messing around I had with making my own servo supports, and would make for an even easier “build it yourself” WTC. Additionally I would probably go for a solenoid valve and the caswell pumps with built in switch board, this would clean up the internals no end, and combined with KMC leveler / fail safe, it would give a very clean look to it, and maybe avoid a longer cylinder. But as I said, I did this with what I had lying around.

                The drive shaft mount is in the standard location for this hull, which is most suited to a D&E 3” wtc (old design), and so if it was sold on or later converted it maintains its resale J. The shaft coupling allows easy transition from Metric Engel shaft, to imperial drive shaft, but is suited only to angular misalignment, so it took some careful work to ensure WTC mounted correctly

                As I mentioned earlier this has been a bit of a mule boat, and took a bit of bashing around in the pool. The original propeller was white metal and firstly got bent a few times, and finally stripped its grub screw. Its replaced with a brass Raboesch 7 blade prop which is a bit too good!!!, and also suffers from having a large hub. I found that Rabo now make a small hub 7 blade scythe (R186-10), but need to get Mike excited enough to stock them as I cant find a distributor, go on, you know you want to.

                Well that’s the mechanics sorted aside from a switch, I just need to finish the paint job now, and then I can start something new J
                Attached Files
                Last edited by Albion; 05-14-2010, 05:53 AM.
                Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

                Comment


                • #9
                  Line in the sand time. Here she is pre weathering, pre lacquer coat.

                  The front vent in the sail looks minggy, i hate digital close ups, they show up everything
                  Attached Files
                  Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

                  Comment


                  • #10
                    Below Waterline, yet again the flash is making the white appear much more prominent that it really is
                    Attached Files
                    Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

                    Comment


                    • #11
                      Albion,

                      Much, much better effort this time. I think you'll agree with me that taking the time and working in the new techniques you've learned has turned your model into a much, much better looking display that what you would have had had you gone with the original paint-job. Well done, sir.

                      Don't forget the bird-**** streaking down from atop the upper rudder!

                      And you'll soon have a 1/72 M-1 to further practice your painting skills on. Thank you for being patient with me.

                      David,
                      "... well, that takes care of Jorgenson's theory!"

                      Comment


                      • #12
                        no problem and thank you. the Toothpasting trick has worked in a few places, and next time i can get that better, so not 100% but not bad , im pleased for now. just need to dirty up the topside as its looking a little stark
                        Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

                        Comment


                        • #13
                          Latest condition.

                          Need some natural sunlight shots, the flash makes everything look, well more weathered than it is.

                          Prop shop prop :wink:
                          Attached Files
                          Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

                          Comment


                          • #14
                            Well finishing touch's on this one, i needed to make it a boat more user friendly. The front end cap for WTC also had the hole for the wtc locator pin, so it meant this had to be lined up with rear end cap, also it mean't hassle for removing end cap whilst wtc was in hull. (ie major strip down to get to the batteries. I also needed an on / off switch.

                            I had realised that the motor i was using was too high reving (Engel 540/6), a test using the new prop showed 7.5 amps at max speed, and was audibly straining. My Koryu which is swinging a bigger prop, albeit only a conventional 3 blade (this is 7 blade cleaver), only pulls 1.5A, with its slower running motor, so i got hold of another one of this type (Engel 540/12), which needed a big strip down, but the result was only 2amps at full speed, and things still feel a bit tight so this should come down.

                            Looked at the new rubber booted toggle switches on this site, but end cap was too thick, so would need to recess the end cap, plus there isnt much radial room.

                            So i came up with a push on push off mechanism (blue switch), which uses the same seals as my push rods.

                            Also i cut a pin locator in rear end cap, and a pin mounted in the hull. With this type of coupling it isnt so easy to drop the wtc in and locate onto a pin. So the pin hole is actually a channel, and then i have a clip at front of wtc to stop the wtc moving forwards. Was suprised how simple and effective this turned out to be. Also the more observant may notice the RCABS system has changed slighlty, i'm now using a subtech SES switch to turn on the pump, and open a valve, instead of servo. The previous failsafe is needed for a new project, and the SES is now redundant from another boat as i will be using a completely different ballast system, watch this space for future projects!
                            Attached Files
                            Last edited by Albion; 10-16-2010, 08:36 PM.
                            Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

                            Comment


                            • #15
                              Whilst the RCABS works, there isnt much radial space between the 3" WTC tube and the hull, so im not really getting a good surfaced water line (i know, you told us so).

                              So im going to be retrofitting a 2.5" snort only wtc in here ;)

                              Thanks to the garage sale i have the basic bits and pieces needed along with a long tube which can be cut to fit. Couple of questions
                              1) without any gas tank in the ballast tank, how long should i make the tank?
                              2) Looks like there should be a lip seal on the drive shaft. Could you let me know what it should be so i can get back in Singapore
                              (currently enjoying , hah, the -20C weather in western PA)
                              Attached Files
                              Next time someone points out it takes 42 muscles to frown, point out it will only take 4 muscles to b1tch slap them if they tell you how mnay muscles you need to smile:pop

                              Comment

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