Tiddler by Vic Smeed

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Tiddler by Vic Smeed

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  • #61987
    Phil H1
    Participant
      @philh196021

      Using their motor tables, I am drawn towards the 775-5 brushed motor. Does this sound about right? Is it overkill or even underpowered?

      Philh

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      #61989
      Paul T
      Participant
        @pault84577

        Hi Phil

        Personally I would go for the MFA800 with the extra torque

        Paul

        #61990
        Phil H1
        Participant
          @philh196021

          Paul,

          Thanks. I was originally directed to the T12 motor but noticed the high cost but complete lack of data. I was then directed to the 500 series motors but I felt that might be a bit weedy.

          I did try a real good search through previous questions but I wasn't able to find anything that related to single screw tug motors.

          I'll plan for the larger motor as you suggest. I'm guessing that the only possible disadvantage to the extra umph is a few more quid but the big advantage is the ability to get where you want to go in light winds? Oh and the ability to do a bit of towing.

          Phil h

          #61998
          Paul T
          Participant
            @pault84577

            Hi Phil

            Extract from supplier

            The 800 motor specifically designed for 30"-48" displacement (non planning) boats.
            It gives 'cruising' type performance with maximum battery duration and is ideal for tugs, cruisers and warships etc.

            Approx motor diameter 50mm by 70mm long.

            Operating Voltage 12 volts.

            Current approx. 5.28A at max efficiency.

            RPM at 12.0v – 4289 at max efficiency.

            Weight 595g (approx)

            Shaft Diameter – 6.35mm (1/4&quot


             

            Have a look at this **LINK** not exactly a T12 but at least there is some data, I have been tempted to get one and test it to destruction and if it operates ok buy a few and flog them as tug motors. 

            Paul

            Edited By Paul T on 13/12/2015 21:00:26

            #62010
            Phil H1
            Participant
              @philh196021

              Paul,

              Yes you are right yet again. The text you have attached from the Cornwall site couldn't be clearer on its application could it? Wish id spotted that earlier.

              Yes I also suspect that there are probably cheaper motors available.

              Philh

              #62021
              Paul T
              Participant
                @pault84577

                Hi Phil

                Its a shame that the T12 / T24 don't have any data as they would probably sell a load more, perhaps the T12 / T24 came from China without any specification sheets.

                Paul

                #62024
                Phil H1
                Participant
                  @philh196021

                  Paul,

                  Yep data for comparison would help but how much at this stage is debatable because I'm starting completely from scratch and don't have any electrical parts whatsoever. I will study the various articles that are available on model boat electrickery (more thoroughly than I have done to date). Perhaps I should create a circuit diagram and tick off the parts as I begin to understand them.

                  Getting back to the woodwork. I've now fitted all the bulwark capping and its starting to look ok. Deck details and Superstructure soon.

                  Philh

                  #62028
                  Paul T
                  Participant
                    @pault84577

                    Phil

                    You know that Uncle Bob will be asking for photos and I would like to see the capping.

                    Paul

                    #62034
                    Phil H1
                    Participant
                      @philh196021

                      As requested, the very roughly fitted capping, followed by the very roughly sanded version. Just need to finalise its width of the capping all the way round the inside edge then do the usual filling and coating etc.

                      PhilH.

                      img_2678.jpg

                      img_2686.jpg

                      #62035
                      Paul T
                      Participant
                        @pault84577

                        Looking very good

                        #62099
                        Phil H1
                        Participant
                          @philh196021

                          img_2688.jpgimg_2690.jpgLooks slightly better with a coat of primer. I am finding that the primer is a really good way to help me find the faults in the surface. These shots show plenty of small dinges but it is at least getting a bit closer. the build has taken just over a year now. I can at least understand why people are tempted to buy a fibre glass hull.

                          img_2691.jpg

                          #62106
                          Tony Hadley
                          Participant
                            @tonyhadley

                            Must agree with Paul's comments – "Looking very good".

                            #62660
                            Phil H1
                            Participant
                              @philh196021

                              Thanks for the kind comments but still needs some work. I am frustrated by my inability to eliminate the balsa plank witness marks. They are only very slight but I will probably avoid balsa planking in future. The plywood bulwarks required rubbing down but nowhere near as much work as the balsa hull.

                              Anyway, over to the superstructure. Ive got some nice plastic drain pipe for the funnel (actually part of an old sink drain fitting) and this made me think about styrene for the superstructure. If I was going to use 3mm ply bulkheads and 1.5mm thick ply for the sides and top what would be the equivalent thickness of styrene? Or should I clad a wooden structure with thin styrene sheet? Any views?

                              #62661
                              Dave Milbourn
                              Participant
                                @davemilbourn48782

                                The superstructure isn't very big so I'd use 1mm styrene. It's thick enough to hold its shape without needing a ply backing. Use 1.5mm styrene for the bulkheads and that way you can use something like PlasticWeld or MEKpak for all the gluing. It's also a lot easier to get a decent finish on styrene.

                                Dave M

                                #62666
                                Phil H1
                                Participant
                                  @philh196021

                                  Thanks Dave, ill try and get some and have a go. I need some styrene sections for bits like the Samson posts and the winch etc. Oh don't happen to know whether it takes the Halfords spray paints do you without bubbling or melting etc?

                                  #62669
                                  Dave Milbourn
                                  Participant
                                    @davemilbourn48782

                                    Oh don't happen to know whether it takes the Halfords spray paints do you without bubbling or melting etc?

                                    Like a dream, dear boy! I use Raboesch white styrene profiles from CMB **LINK** and there's another recommended type called Evergreen, which you can Google for supply. For shorter lengths most mail order shops stock K&S in 300mm strips.

                                    Dave M

                                    #62676
                                    Paul T
                                    Participant
                                      @pault84577

                                      Hello Phil

                                      If the prospect of styrene isn't your cup of tea you could try 1.5mm liteply (or 1.5mm MDF) easy to work with and stronger than plastic.

                                      Paul

                                      #62677
                                      Phil H1
                                      Participant
                                        @philh196021

                                        Paul,

                                        I will go and have a look at styrene first. I've noticed the polythene packs in the model shops but not really had a go at it yet. If I ever get this boat finished, I will definitely be applying a few of the lessons to future builds and ill think about MDF. Ashley might even convince me that hardboard is a good idea.

                                        Philh

                                        #63415
                                        Phil H1
                                        Participant
                                          @philh196021

                                          Dave/ Paul,

                                          I didn't ask for your advice and intentionally ignore it. I was simply drawn in by my pile of spare plywood that I had.

                                          For the main superstructure, I used 1/8" plywood frames and top with strip wood spacers/ supports for the1/32" thick plywood sides.

                                          I built the accommodation and various tank type features by gluing together bits of balsa to form a block. The balsa block was then clad with 1/32" ply and sanded smooth.

                                          Cutting out the wheelhouse window frames were a bit tricky but I think they look ok.

                                          Now for the confessions…… yes I know I should have turned them myself but the pack of bright shiny brass portholes hanging in the model shop were too tempting. I guess I should also come clean about the plastic swan neck and cowl vents that I bought…. sorry.

                                          Anyway, I drilled all the holes for the portholes in accordance with the drawing but there appears to be an error. The porthole in the accommodation is on the centreline immediately behind the mast. Its either an error or quite dark inside the accommodation so Ill fill and move it.

                                          super1.jpg

                                          super 2.jpg

                                          super 3.jpg

                                          super 4.jpg

                                          #63416
                                          Phil H1
                                          Participant
                                            @philh196021

                                            The mock up shows the tug about a week or so back.

                                            I chopped up some plastic drain fittings for the embryo funnel and drilled all the holes along the side of the bulwark for the tyres. Those white rings on the side of the bulwark were machined from a chunk of nylon (I think). Forgive the temporary balsa wood wheelhouse roof. Ill replace it with plywood shortly.

                                            I rubbed down the hull yet again and gave it another coat of paint. I believe it is now close to being acceptable. I've also started to fix all the various doors and hatches (made from 1/32" ply).

                                            full mock up.jpg

                                            frontviewblack.jpg

                                            sideviewblack.jpg

                                            #63417
                                            Phil H1
                                            Participant
                                              @philh196021

                                              The mock up shows the tug about a week or so back.

                                              I chopped up some plastic drain fittings for the embryo funnel and drilled all the holes along the side of the bulwark for the tyres. Those white rings on the side of the bulwark were machined from a chunk of nylon (I think). Forgive the temporary balsa wood wheelhouse roof. Ill replace it with plywood shortly.

                                              I rubbed down the hull yet again and gave it another coat of paint. I believe it is now close to being acceptable. I've also started to fix all the various doors and hatches (made from 1/32" ply).

                                              full mock up.jpg

                                              frontviewblack.jpg

                                              sideviewblack.jpg

                                              #63418
                                              Dave Milbourn
                                              Participant
                                                @davemilbourn48782

                                                It's looking very smart, Phil – even at this stage.

                                                Dave M

                                                #63420
                                                Phil H1
                                                Participant
                                                  @philh196021

                                                  Thanks Dave, it looks like two coats of high build primer with a rub down between coats is sufficient to hide the plywood grain on the superstructure.

                                                  I cheated with a few plastic fittings but I've also bought various brass sections to fabricate the rest.

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