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Building the Kyosho SpeedMaster

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    Building the Kyosho SpeedMaster

    This is the kyosho speedmaster. I think the age of this boat can only be determined by carbon dating... ...c that old kyosho logo?

    I have been trying to find some info about the boat, but it is not even in kyosho's list of discontinued products..

    The box is already disintegrating, fortunately the contents are still in acceptable condition, though some plywoods are a bit brittle and the plan is yellowish.

    But I would consider this a top quality product by yesteryears standards. The boat is constructed entirely from plywood and hardwood, there is no balsa in the kit. It does'nt come with an instruction manual, but the plan has enough details, only that certain parts are not drawn to scale, e.g. the thickness of bulkhead is about 0.5cm but it is at least 0.8cm if measured from the plan.

    A set of high quality stainless steel drive unit which includes the rudder is available for purchase separately, but it's for the original nitro setup, I didn't buy it since I am converting the boat to electric. In any case, I won't pay $50 for it as the boat is only $10...

    So, this is to be my first speedboat... ....but won't be building it like an offshore racer, since it's an antique, will give it that classic wooden boat look...


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    #2
    Some vintage wooden racers for reference....


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      #3
      The stringers came together very straight forward, only need a little bit of trimming. That pilot is not part of the kit..


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        #4
        With the frame completed, the bottom and sides can now be planked.


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          #5
          Cut out the slot for fin.


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            #6
            Have to make the rudder assembly on my own, since I didn't buy the drive unit package.

            Rudder tube cut from 3/16 brass tube.


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              #7
              Took rudder dimension from plan and cut the shape out from 1/8 lite ply. Finally glassed for strength.


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                #8
                Usual method of making the stuffing box.


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                  #9
                  Bought the brass strut for $1 a piece. One side of the hole is too big for the shaft, so have to solder a 3/16 tube in it.

                  Slot for the strut is cut out with the help GP slot machine.


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                    #10
                    Rosewood varnish the inside for waterproofing.


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                      #11
                      Patched up with foam to prevent sinking in case of flooding.


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                        #12
                        Trim tabs installed according to the plan. This should keep the bow down.


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                          #13
                          Trial fitting the prop, strut and stuffing box. 4 bladed prop is my own make, performance not tested!..


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                            #14
                            Strut is epoxied in place and strong box built around it on the inside.


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                              #15
                              Initially thought these few pieces of wood are for making nitro engine mount, luckily didn't glue them inside the boat...

                              Very sturdy boatstand.


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