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Thread: Return to the Skipjack modifications

  1. #61
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    I know the latex rubber is affected negatively by UV light and lots of solvents....
    Regards,

    Matt

  2. #62
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    It's Saturday and I have a post.

    Today I had scheduled to charge the batteries of the Akula II and Skipjack.

    1. The Akula II battery. (12v...2 -6 volt in series)
    I was surprised when I checked it.
    The voltage was still at about 12v.
    Charging time was 40 minutes to bring up to full.
    The boat has a mornings run on it and a lot of bench running to adjust motor speeds and increase rudder swing from 30 degrees to about 40 degrees.
    During the last run, I had a very large turning radius and this made it hard to control.
    The adjustment was done at the servo control horn with the Tx control set at 100%.
    I can go up a the Tx to 120% before the servo hits it's stops.
    And of course I can go down to zero.

    2. Skipjack battery. (7.2v LiPo, 2650 mha)
    Again I am surprised.
    2 runs at the pond and a lot of testing on the bench and many water trim tests.
    Checking this battery, showed that there was still 75% left. (I am amazed)

    The NiMh battery was warm after charging. Not hot. But It is right at 100 F outside.
    My charge requires me to use the truck battery.
    And I did this charging right after returning from town so the air cleaner was very warm to the touch as well. (got to remember to charge before running truck)
    The LiPo was charge after the NiHh and the truck has cooled down.
    This battery was barely warm.
    The metal handrail on my porch was just as warm.

    I will let the batteries set today and install them tomorrow.
    Basically, I do not want to go out in to the shop which I know has warmed up.
    Once I install the batteries, I will wipe down the hulls to get water spots off and put the boats in their transportation boxes.
    Got to look nice for arrival at the pond.

    Charging the Tx with occur Wednesday and Thursday.
    Akula II Tx shows 10,.0v.
    Skipjack shows 9.6v.

    These numbers look good to me as well.

    Next weekend our local group (SubRonLA) is having a 2 day fun run.
    Hope to see more people come out.
    I know I can make Saturday and I hope to make Sunday.

    I have put my camera and extra batteries on the sub travel bag. (last gathering I forgot it and got no photos..and it was my Akula II first run. ah nuts!)
    --------------
    This next week, I plan to go look at a couple cars.
    A friend said I should at least go look. My current truck is 31 years old but runs fine at 200,000 miles. I rebuilt the engine looking for a water leak. Found it.)
    My other other truck is only 29 years old but has 397,000 miles on it. It run good as well but I only use it when I need to haul propane.
    So, I could replace it and not miss it.
    I have several small trailers and I could put the propane tank on one of them to haul.

    Anyway, Not in a rush. I have been saying I want a newer car for years.
    Just haven't gotten serious.
    ----------------
    SSBN 598 - blue/nuke trained IC/forward

  3. #63
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    Batteries installed in boats.
    Hulls closed up.
    Hulls cleaned up.
    Boats in transportation boxes.

    Started sorting through tools that I will take.
    Made sure to have Schrader valve cap..s.
    SSBN 598 - blue/nuke trained IC/forward

  4. #64
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    I have piles the tools I think I will need, in the middle of the work bench.
    I do not lots of tools because I prefer not to do major work on my boats at teh pnd.
    Just enough to open it up to see what's going on and if a screwdriver, silicone grease or rubber band will fix it.

    Don't have a tool box.
    I use a 3 gallon bucket.
    Why, because it will hold all the tools ad things I need and I can put 2 Tx in there are well.
    During travel, the bucket sits on the passenger side floor with my little lunch carrying ice chest.

    I have the Tx and the charges on the kitchen table.
    Charging takes place on Thursday.
    SSBN 598 - blue/nuke trained IC/forward

  5. #65
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    Matt, this update is for you.
    Day 1 of 2 day gathering.

    Skipjack in the water.
    The ballast system safety tank is now big enough to hold enough water to ballast negative.
    The 24" balloon does not stretch the latex when the safety tank is full.
    Dive time went from 3 minutes plus to about 40 seconds.
    No back pressure on the pump from balloon stretch.
    Surfacing remained about the same with a from the bottom to waterline in about 50 seconds.
    (a little longer than before when the balloon stretch was helping empty the balloon)

    All in all, I liked the results very much.
    I need to redesign the safety tank end that has the opening the balloon goes through because the neck of a 24" balloon is bigger than the 12" balloon and harder to seal with the zip tie.
    I will make these parts bigger.
    ===================
    I think my next modification to the Skipjack is to get rid of the front Z cut.
    Make the hull split at the center line and leave the rear Z cut.
    This will be a major modification because I will have to cut the lower bow section off and mate it to the lower hull and then clean up the joint line from bow to stern.
    But, this is not a priority.
    May be months until I get to this.
    It work well as is so there is no rush at all.

    The Akula II ran well.
    I still have a rudder throw issue.
    I only get about 30 to 35 degrees rudder through and the boat required more than 20' to make a circle.
    Spent time talking to Mike Dory and looking over his Akula II and I see what I need to do.
    I had it right originally but do to linkage control interference, I moved the linked a the servo to stop the binding.
    Looks like I need to go inside the tail cone and bend the control rods a little bit so I can go back to the 3rd hole on the servo control arm.
    Mike's rudder on his boat will move more than 45 degrees.
    His will also turn about 8' circles.
    All other systems work great.

    To day was a good day for my 2 boats.
    Of course the day didn't go well for me.
    I turned on the table concrete slab and stepped on the corner of the slab which had a 6" drop.
    I ended up falling to the ground.
    Now my right arm is not very happy.
    Not broke but it is so sore, it's own weight hurts and requires me to assist with my left hand.
    I am going to the 2nd day at the pond with my camera and taking NO boats.
    Lifting them out of the back of the truck told me this was not going to happen for awhile.

    Having lost muscle tone after 34 days sick, I have to get busy doing stuff to build up my body some to keep this stuff sort of thing from happening.

    All in all it was a very good day.
    SSBN 598 - blue/nuke trained IC/forward

  6. #66
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    I did take some photos at about 8:00 am this morning.



    2 people and boats for the northern California showed up with a few boats.


    Interesting fact.
    The 2 white boat hulls are built of wood.












    My Akula II on the surface.


    My Akula II on it's way to the bottom in a static dive.
    Made it.
    Best part is it came back up!


    .
    SSBN 598 - blue/nuke trained IC/forward

  7. #67
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    Sunday boats.

    Under way!








    How about a Nautilus




    SSBN 598 - blue/nuke trained IC/forward

  8. #68
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    Great update, Ralph!
    Regards,

    Matt

  9. #69
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    This morning, I decided to not put off, opening up my 2 boats and making sure the ballast systems where empty of water.
    Did that.
    Put the hulls on the display stands.
    The Akula II is open about 1/2" to let air in to the hull.
    The Skipjack is together with the cylinder out and open underneath it. (in the box)

    I am going to take a few days off building and fixing.
    SSBN 598 - blue/nuke trained IC/forward

  10. #70
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    Your boats are very impressive sitting on the water! Nice work, Ralph!
    Regards,

    Matt

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