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German type XVIIb

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  • #16
    Login problem is solved, back to business,

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    Made this lower part on the lathe, added a tube with some cutted slits.

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    Drilled through the shaft of the wing and placed this rod.

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    The rod inside the shaft connects to the turned part, now i'm able to lift the deck, and each time i place the deck back this connection will be made automatic, position of the wing will be straight on the deck.

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    To prefent the shaft from falling out when turning the upperdeck upside down, i made a collar which secures the shaft on it's place.

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    Next step was making the connection to the rod which is connected to the servo, had some spare graupner parts from my declassified VII, they proved to be usefull, this will be the above surface position, i can tweek the position by turning that threaded rod and secure the position by fastening the nuts.

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    By pushing the servo rod, the wing will turn into the position during diving, not sure if i want to make this a automatic action or keep it manual, i expect the germans played with the positon of the wing compared with the speed, it seems logical to me that you can adjust the position during diving, have to think about that.

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    First step in getting working torpedo doors, had to place the boat into a rather risky position.

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    Used my chair to keep the boat in it's position, secured the tail with a large amount of ducktape, used 2K epoxy glue, it takes about 1 hour to get solid, 24 hours to harden completely.

    For now i have to make the spring which will close the doors and shorten the servo rods controlling the tubes/doors, also adding a connector to the rods using my graupner connectors, loads of work, stay tuned.

    Manfred.
    Fertig zum unterwasser.

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    • #17
      Spring made, rods shortened added theconnectors and some Rube Goldberg stuff,

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      The spring is made from some 0,03 copper strip.

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      Both steering rods are shortened, tapped some M3 thread on the M4 rods, had to turn those down to make M3 thread possible.

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      Spring is placed, those wings will give enough tension against the doors to keep them closed, those plates with copper eyes are part of my Rube Goldberg contraption, started nitting the strings.

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      This is how it works, the string is attached to the door, the other plate is placed on the hull to pull the door into that direction, the second plate is placed at the hull in front of the pull rod which will open the door by linear movement.
      For demonstration i simply pull on the string by hand to open the door, have to build/modify the pull rod on top of the torpedotube.

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      Door closed.

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      Door open, plenty of room to get the torpedo out.

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      Talking about torpedo's, this is my stash, those grey one's are from the type XXIII, the smaller one's are intended for the reartube of the type VII, the larger one's are for the four fronttubes of the type VII.
      When building this boat in the past i went for the longer launchtubes so i can use the longer torpedo's from my type VII.

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      Dryfitting one of the torps to see if there is enough clearence to go past the opened door.


      Manfred.


      Fertig zum unterwasser.

      Comment


      • #18
        Last week done some serious work to get me a working launchsystem,

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        First step was to connect the pushrods from both tubes, shown here the most closed and opened position.

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        Connecting the doors by fastening the pull wires to the slidingrods.

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        Position of the door in the most opened position.

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        Next hurdle was, building the fire solution center for controlling the launchtubes, from left to right, multi switch decoder for controlling the relais of both tubes, 2 failsafe prints, one for opening the doors, the other for closing the door, the most right print is the fire control switch.

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        Left switch is the left launchtube, middle switch the right launchtube, in this position both tubes are closed, by selecting the switch forward you activate the choosen tube, last step will be, push down on the switch near the antenna, this will activate the fire control switch, made this switch to counteract flutter which can fire your torps accidentely.

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        Inserted both torps, doors are closed.

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        After activating the left switch and pushing on the fire switch on the transmitter the door will open and fire the torpedo, the launch happens by running the torpedo under it's own power out of the tube, pretty much the same way as with the type XXIII.

        Now this is done i can turn my attention to rebuilding the batteries to my need, modifing the ballasttank, and start work on the 12V power backbone, to be continued.

        Manfred.
        Fertig zum unterwasser.

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