Vic Smeed’s Hydro-Bat

Vic Smeed’s Hydro-Bat

Home Forums Scratch build Vic Smeed’s Hydro-Bat

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  • #73069
    OVERLORD
    Participant
      @overlord

      Hi All,

      In the thread "Vic Smeed's model boat designs" my build of the Hydro-Bat was mentioned. It keeps me busy for a few months now and I'm enjoying it. The model will be powered by a Black Lynx engine made by Model Engines in the US. It's in fact a modern Cox engine made with performance parts. I won this engine with a picture contest on Cox Engine Forum. The build is coming along well. I did a small modification on the rudder because I didn't like the rudder arms and push rod above the deck. I also changed the canopy. It became a bubble canopy with dashboard. Plan is to fix a pilot figure afterwards.

      Some pictures:

      (I can't figure out anymore how to insert a picture, I did it before though. can someone explain? th.

      Lieven

      #7103
      OVERLORD
      Participant
        @overlord
        #73071
        ashley needham
        Participant
          @ashleyneedham69188

          Hi Lieven. Look at the home page FAQ bit. Basically you create an album, put pictures in it and these can be put into a posting.

          ​Performance parts for a Cox engine!!

          Ashley

          #73073
          OVERLORD
          Participant
            @overlord

            Thanks Ashley, All clear.

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            #73075
            Dave Milbourn
            Participant
              @davemilbourn48782

              Coming on nicely. Incidentally I've never needed more than tinman's {soft} solder and Baker's Flux to fit a rudder blade to a shaft, as long as you cut a slot in the shaft to fit and peg it with 1/16" dia brass rod. As you've found, brazing can be cruel to thin brass sheet and the high temperature will soften the brass rod and allow it to bend easily.

              044a.jpg

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              Dave M

              #73078
              OVERLORD
              Participant
                @overlord

                Thanks Dave for the tip. On this model, the rudder stock is only 2mm in diameter. The rudder blade is stainless steel. That's why I had to silver solder the 2 together. The rubbish you see in the picture is the flux on the blade. After cleaning, it looked like this:

                imgp3885.jpg

                #73079
                Dave Milbourn
                Participant
                  @davemilbourn48782

                  That's two lessons for Kevin, then!

                  DM

                  #73086
                  Andy C
                  Participant
                    @andyc56856

                    Okay so how the heck do you saw a slot in a rod that small?

                    Andy

                    #73087
                    OVERLORD
                    Participant
                      @overlord
                      Posted by Andy C on 08/09/2017 07:01:00:

                      Okay so how the heck do you saw a slot in a rod that small?

                      Andy

                      I didn't. The rod is just put on top of the blade. That's what Vic must have done when making his prototype. According to the plan, he uses 1/16 piano wire. The blade was cut from a paint scraper or putty knife. The central fin was made from the same material. I think it's a little less than 1 mm thick.

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                      #73088
                      OVERLORD
                      Participant
                        @overlord
                        Posted by ashley needham on 07/09/2017 08:28:26:

                        ​Performance parts for a Cox engine!!

                        Ashley

                        **LINK**

                        #73189
                        OVERLORD
                        Participant
                          @overlord

                          Yesterday, I finished the hull.

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                          #73194
                          ashley needham
                          Participant
                            @ashleyneedham69188

                            Master. How will you access the inside for battery and equipment fit and so on ?? Will you have a man in the dome? Ashley

                            Killer bee crankshaft !!!! my word.

                            #73197
                            Dodgy Geezer 1
                            Participant
                              @dodgygeezer1
                              Posted by ashley needham on 13/09/2017 17:46:09:

                              Master. How will you access the inside for battery and equipment fit and so on ?? Will you have a man in the dome? Ashley

                              Killer bee crankshaft !!!! my word.

                              Looks like the dome is at the centre of a balsa hatch…

                              #73200
                              ashley needham
                              Participant
                                @ashleyneedham69188

                                I thought as much. These things are usually very wet on top. Water exclusion is always an issue.

                                Ashley

                                #73209
                                OVERLORD
                                Participant
                                  @overlord

                                  The article in Grid Leaks by Vic says to sheet the entire model and then cut out the hatch for access to the radio compartiment. The hatch will be fixed with "surgical tape". I don't know what that looks like but I'll use sticky tape. The dome will have a pilot. It's a light plastic pilot figure of IM Products of Japan. I have since I was a youngster. Finally I could find a use for it. The dash board is already in place.

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                                  #73211
                                  ashley needham
                                  Participant
                                    @ashleyneedham69188

                                    One method of sealing the hatch is simply to (once the gear has been turned on and found to be working ok!) stick clear sellotape over the edges of the hatch. As long as the gloss paint is well adhered to the balsa there should be no issues with ripping bits of paint off, and the tape is undetectable once on the water. It is also 100% waterproof and easy to do.

                                    Ashley

                                    #73212
                                    Dodgy Geezer 1
                                    Participant
                                      @dodgygeezer1
                                      Posted by ashley needham on 15/09/2017 07:51:04:

                                      One method of sealing the hatch is simply to (once the gear has been turned on and found to be working ok!) stick clear sellotape over the edges of the hatch. As long as the gloss paint is well adhered to the balsa there should be no issues with ripping bits of paint off, and the tape is undetectable once on the water. It is also 100% waterproof and easy to do.

                                      Ashley

                                      If you are worried about pulling the paint off, run your finger once over the sticky side of the sellotape. This will suppress the strength of the adhesive a bit, but leave it still capable of sticking to a smooth surface….

                                      #73226
                                      Trevor Holloway
                                      Participant
                                        @trevorholloway99134

                                        I have also found that "Scotch tape" is better suited than "Sellotape" as it is less sticky and leaves no residue.

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