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Thread: Skipjack Modification #3

  1. #91
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    More tests postponed for today.

    While drying off the lower hull, I found a 4" long seam line where I added a sliver of plastic strip to hull to fill centerline gap.
    At first, I thought I would just let it go for now.
    But, the hull is on the bench.
    I am cleaning off silicone glue where the weights were.
    Why not just sand and fill the line while I am at it.
    I want the glaze to cure over night before sanding smooth and painting with red primer.

    Thing is, I had not noticed it until I turned the hull 45 degrees on to it's side.
    Now that I have seen this, I have to fix it.
    SSBN 598 - blue/nuke trained IC/forward

  2. #92
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    Taped, sanded and first coat of primer red on the hull.
    Will wait at least 30 minutes and I will apply the second coat.
    All going well.
    SSBN 598 - blue/nuke trained IC/forward

  3. #93
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    Bottom red completed yesterday.
    Today, I will take brush in hand and paint the edges that show at the centerline with black.
    Just waiting for it to warm up some.
    Currently 53F and I will wait for 70F.
    Couple of hours will do. (now 7:10am. 9am should work)
    SSBN 598 - blue/nuke trained IC/forward

  4. #94
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    Yesterday's edge painting went well for a guy who does not have a steady hand. (I hate painting for so many reasons)

    Brought the lower hull inside.
    Looks like trimming will continue right after lunch. (about 1pm is my guess)
    I have may collection of various sized lead weights,
    I have my clear silicone glue.
    My Tx is charged up.
    Have a thick towel on the floor to save my knees during this operation.

    I was very close the other day, so I do not think this will take very long once I get started.

    Wednesday and Thursday are for charging all the batteries. Tx(s) and Rx(s)
    Friday is for making sure I have all the parts and tools needed for the Saturday gathering.
    (I actually started setting tools aside as I use them on the boats to make it easier to gather them up.)

    I do not do major repairs at the pond.

    Think I will see if I can find one of my out door chairs to take this time and clean it up.
    SSBN 598 - blue/nuke trained IC/forward

  5. #95
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    Results of this afternoon trimming session.
    -----------------------
    The 2 weights I cut and moved were removed again and cut again.
    Total of 1/2 ounce was cut from each weight.

    The 2 upper center weights after cutting where stacked on top of each other and placed to the right of the frame behind where the 4 weights are shown in the photo.
    There was room to drop them between the frame and the weigh already in place to the right of the frame.


    Back in the water again.

    Surface trim is good.
    Submerged trim has the stern still a little high.

    I took some small lead pieces and tried them on the top of the submerged hull about where the cylinder end cap is.
    Move them back and forth looking for submerged level.

    Not quite what I was looking for.
    I noticed that I now have a surface level with about 3/166" above the waterline. (this is good)

    Found a long thin piece of lead and set it on the hull about where the end cap is.
    This was to far to the rear.
    Stern went all the way tot he bottom.
    Okay, I can work with this.
    Move it the weight forward about 1".
    try again.
    Move again, try again.
    When I got the weight to between the vent holes, I got a level submerge hull.
    Measured from the hull upper cut at the tail cone to the weight.
    Took the boat out of the water and dried it off.
    Removed the cylinder and dried the inside out.
    Measured the distance where the weight is to go and found it was right over the flood ports and center of the group of 4 holes.
    Easy enough to remember.

    Out to the shop to clean up the weight and paint it.
    Let it dry for 2 hours.

    Back in the house I used 2 little drops of silicone glue and put the weigh int he hull.
    Waited 30 minutes andput the cylinder back in the hull.
    Readied the boat for water trimming again.
    Back in the water.
    Boat still sits above the waterline by about 3/16" at the bow and right at the waterline at the stern.
    Pumps a little water in to the ballast bag until I got the bow at the water line.
    3 seconds of pump.
    The stern is about 1/4" low.
    I can live with that.

    Dived the boat to the bottom.
    Level all the way down.
    Brought the boat about 1" off the bottom and hovered.
    Boat is still level.
    Let the boat on the bottom for almost an hour.
    Inside cylinder is dry.
    Rubber boots working as expected.

    Surfaced the boat.
    Emptied the ballast bag of all water and then pumped a little air in so the balloon sides do not stick together.
    Turned off powder to the Rx and Tx .
    Removed the front end cap Schrader valve cap so the cylinder can breath.
    Wiped the boat dry.

    The boat is ready.

    Only need to charge up the batteries.
    This part of the getting ready schedule.
    ============
    Note for Matt,
    The 24" balloon is working well.
    This is still the first balloon I put in.
    When full dive is achieved, the balloon is not being stretched.
    Could probably get half again as much water in it before it stretches.
    No strain on the pump in or out.
    But there is no help when emptying the balloon.
    It is all pump.
    SSBN 598 - blue/nuke trained IC/forward

  6. #96
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    Photo of the ballast weights in their new locations.
    SSBN 598 - blue/nuke trained IC/forward

  7. #97
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    Tx(s) on the chargers.
    Boat batteries where charged this morning. (LiPo(s))

    Skipjack has been assembled and placed in it's transportation box.

    Akula II sitting on table waiting for it's batteries to be put back in.
    Then in to the transportation box it will go.

    Had some time in the shop yesterday, so I gathered the tools and parts and put them in my 2 gallon carrying bucket.
    Once the Tx are charged they will go in the bucket as well.

    It looks like I might get back to working on the ALMA next week.
    SSBN 598 - blue/nuke trained IC/forward

  8. #98
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    Results from in the pond.
    Ran about an hour.
    Trim is good, surfaced and submerged.

    The centerline cut was so much easier to work with at the pond.

    The sail plane control rod attachment reversed was much easier to use and connect by just placing the upper hull on the lower hull.


    While packing up to come home, I did notice a little water in the cylinder.
    1/4 teaspoon, maybe. (I will look for a leak)
    Nothing I am concerned about.

    All in all, it was a good day.

    (Akula II with new rudder was a success. Now to clean it up so it looks better)
    SSBN 598 - blue/nuke trained IC/forward

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