61′ Barnett class lifeboat

61′ Barnett class lifeboat

Home Forums Scratch build 61′ Barnett class lifeboat

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  • #101638
    neil hp
    Participant
      @neilhp

      The starboard side has now been sandrd to the frames, giving the base lines of the hull.

      The port side will be sanded tomorrow.

      this,

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      to this, in an hour, using my powerful diamond grit bladed Works sonic sander.

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      #101639
      neil hp
      Participant
        @neilhp

        The starboard side "cast iron " keel ballast has been added temperarily so as to see where to skim up to the keel to level the hull.

        The port side will be dry fit once the port side has been sanded to match the starboard side…….

        But also so that I can see how the alluminium wire gauze will fit into the tunnel recesses cut into the cross frames……will have to pick some up tomorrow as only enough for one side.

        Once the gauze us glued in place later using 2 part epoxy they will be skimmed with filler and then Dolphin Glaze to get a srong and permenant shape.

        Its all slowly coming together, in order.

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        #101645
        neil hp
        Participant
          @neilhp

          This morning I decided to make two quick items for the model.

          The plynths that the two access hatch companionway covers sit on were made from two chunks of laminated obeche' that were cut from the rear of the main cabin…….waste no, want not! as my old mum used to say.

          Measured last night and adjusted this morning before cutting.

          Then I considered whether to glue the fore plynth on to the engine casing before moulding it all as one piece because of what i imagined would be a couple of tight corners or leave it off. and just mould without it being attached.

          Always good to check the plans lol.

          My fear was that the angles made in a double angled joint on the right hand side [as we look at the photo might be too acute .

          However that has been negated as the plynth fits straight up to the"corner" of the chamfer on the front of the engine casing, and therefore no acute double angle……..so PANIC OVER, and the plynth has now been glued to the engine casing with 2 part ZAP 5 minute epoxy.

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          #101671
          neil hp
          Participant
            @neilhp

            So!!!, what did i need the filler for…….

            there are some deep holes in the sides of the full and cracks where the blocks wore thin at the joints which will need filling, but if i try just to put it in to the cracks from the outside of the hull it will just fall through.

            And so i have drilled holes in the deck and can now, after masking up the holes from the outside, squirt expanding fome into the hull in the tween frame gaps……….which wikk bung up the large cracks ready for filling on the outsides…

            I am pleased to say, All went as hoped.

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            #101700
            neil hp
            Participant
              @neilhp

              Thought I'd have a little deviation from the boredom of filling in the holes and divets in the hull…………looks like an amateurs pitch and put golf range at the mo………….

              And so I thought I'd have a look at the twin funnels for the Princess Mary. They are NOT round in plan view, but oval, but not eliptical, which makes life a little easier………

              So how do you get a length [or two to be precise] .both from round to oval.

              I have made a jig of a base and three pieces of obeche and two G cramps, and am going to heat up the two tubes in an oven.

              Once to a thermo changed heat where I feel that they will be pliable once squashed, I will slide them between the pieces of timber and slowly screw both clamps together for an equal oval shape, and then leave them to cool down.

              WELL FOLKS!!!
              If you wanna heat up some plastic waste pipe to bend from a round to an oval……….

              DON'T USE AN OVEN……………IT DON'T WORK lol.
              So will mow try my friends suggestion of a hot air gun lol.

              And it was only in the oven for 5 minutes, lol…………bit of overkill, I think.

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              #101701
              neil hp
              Participant
                @neilhp

                After the first attempt at squashing the pipe into an oval from a round, using an oven, which couldn't have gone more wrong than it did, I thought I would next try my friend Dave Stavros Jones idea of using a hot air gun.

                First on low heat, which wouldn't put enough heat into the plastic I then tried it on high heat………..and gently closed up the G cramps as I was heating the plastic……

                Another total waste of plastic pipe, and so I had to think of something "radical" to use and a material I wouldn't have ever thought of using before. Thick brown paper and card.

                It is plyable, easy to glue and can be stiffened and hardened up after construction using cellulose sanding sealer and then varnish before painting……….or if you want to spray the funnels, no varnish but a few extra coats of sanding sealer.

                But what to use for the inner core. I looked around and then inspiration came to me whilst sitting on the throne and looking at an empty inner core of a toilet roll [even though that was too short, I remembered that rolls of gift wrapping paper was the same, and having two daughters living with me……..there's plenty of wrapping paper around to plunder.

                But not only do these have rolls, some have rolls of brown paper to form a roll in the middle of them……….ABSOLUTE MAGIC!!!

                And so, that is what i made o construct my two funnels and stiffen and thicken the original centre roll.
                I built up two funnels from this material, squashing from round to oval as I built up the layers, and then the banding top and bottom.

                And to me, they look pretty good in the raw state whilst the glue [aliphatic reasin was used] is seting hard.

                I will then lavish them with plenty of coats of sealer, inside and out to make them basically as hard as plastic!…….a crisis solved.

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                #101704
                neil hp
                Participant
                  @neilhp

                  The two card inspired funnels for the Princess Mary have hardened up considerably and have in their curing state kept the desired oval shape needed and wanted.

                  Next was the base flange for both funnels, and making both side by side i was actually amazed that the first flange i made, fitted both funnels, and so just used that flange as a template for the second flange.

                  Tomorrow I will make the brackets for the funnels for hanging the Navigation lamp boxes on to

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                  #101712
                  neil hp
                  Participant
                    @neilhp

                    Navigation light boxes for the twin funnels now made from 1mm scrap plasticard

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                    #101713
                    neil hp
                    Participant
                      @neilhp

                      I've had my little deviation from the hull to the funnels now, and have now returned to the Hull, and the job needing to be done the most,

                      That is filling all the holes, and hollows in the woodwork ready for sanding and finishing the hull plug.

                      The port sde has been done, and the hull looks a whole lot better and curvier where there should be curves!……..and it is looking a whole lot better already, although looking closely with a keen eye, there are still some small divets here and there.

                      However, that side will be left for an hour or so to cure and then I'll do the starboard side later.
                      Once the 2nd side has been done, I will go over both sides and fill in where I think there are small hollows.

                      Hopefully by later Monday and definately Tuesday, I'll be able to get it out into the garden and sand it all smooth, before applying a skimming of Dolfin glaze finishing filler, ready for sanding on Wednesday or Thursday.

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                      #101714
                      neil hp
                      Participant
                        @neilhp

                        Been busy this afternoon.

                        Firstly the second side of the hull with very sticky P38, and looking at both sides now they look pretty good, fluid and no high spots at the moment……….all will be seen after sanding!

                        I also filled the unevenness in the cabin/engine casing ready for sanding, and then detailing.

                        And then the funnels were trimmed to the rim on the tops, and the bottoms of then trimmed equaly, about 10mm below the base flange.

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                        #101749
                        neil hp
                        Participant
                          @neilhp

                          There I was, an early start and under Dave Stavros Jones advice, gave the plug a light dusting of matt black spray to find highs and lows so that I could sand it in a nice warm sunny overgrown garden……….and!!!!

                          The heavens opened and stopped the event.

                          And so I sealed the wooden plug for the main cabin/engine room, which I had spent some time last night "paneling" the fore part, engine casing with thin card to symulate the steel plating of said casing.

                          Just off out now to the doctors to give some blood for testing, and hopefully by the time I get back, the rain might have stopped and I can start sanding the hull plug……..HOPEFULLY!!!!

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                          #101759
                          neil hp
                          Participant
                            @neilhp

                            As Dave Stavros Jones said to me lightly spay mat black over the hull and when you start sanding and remove the top layers, you'll see clearly where the hollows are.

                            WELL!!!! I thought it was pretty smooth and level……..I didn't expect to see that many black areas, lol.

                            Never mind, I'd only been at it for 10 minutes……so plenty of time to give it a good sanding tomorrow, and get rid of some more hollow areas.

                            At least I'll be proficient by the Time I have finished it.

                            HE'S a master at his profession is our Dave

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                            #101768
                            neil hp
                            Participant
                              @neilhp

                              Got up this morning to do some more sanding on the starboard side, after making some progress late yesterday afternoon in the sun, only to realise that it had p'd it down last night and was still drizzlng a little this morning.

                              Not only was it raining and stopping play, but whilst out yesterday after I had done the second sanding a sodding seagull had flobbed on the keel of the plug…….I Suppose with such a good aim I really should take it as a good omen that things will continue to go well with the build!

                              And so!, as I cannot sand until the rain stops, I decided to get on with something I have actually overlooked, and unless I want to rely on "tank steering" I'd better fabricate the rudder, and compared with others that I have made in the past…….it is HUGE, lol

                              So have just traced off the plans for the 1st boat built, the RNLB William and Kate Johnston, and modified it slightly to the plan as supplied in the lifeboat Bible Eric Fry's Lifeboat Design and Development.

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                              #101776
                              neil hp
                              Participant
                                @neilhp

                                Well, the weather has been inclement all day so far, and so did no more sanding.
                                Instead, got down to constructing the rudder.

                                Using 8mm multi ply for the "core" and 1.5mm for the outer skins, I proceeded cutting the "blade! of the rudder,and to the blade I glued a piece of obeche' which I cut on my band saw to the same 8mm thickness, and butted them together using aliphatic resin to glue.

                                Left for a couple of hours to set and cure I sanded the two on my belt sander so that there was no "lip" between the two pieces.

                                I then cut out the two plates that fit on to the outsides of the main structure, and they are now gluing, using aliphatic resin.

                                I will leave these to set until later tonight before removing the clamps, and trim it all up, before detailing it all.

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                                #101777
                                neil hp
                                Participant
                                  @neilhp

                                  This rudder is a beast of a size.

                                  The crewman is a scale of 5'8"img_3369.jpg

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                                  #101778
                                  neil hp
                                  Participant
                                    @neilhp

                                    with a sharp knife and a steel rule, the plank markings have been cut into the rudder

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                                    #101781
                                    neil hp
                                    Participant
                                      @neilhp

                                      following in another lifeboat builders footsteps of yesterday on face book it was my turn to make the emergency tiller for the rudder on the Princess Mary of Padstow.

                                      From a length of obeche' I marked one out, cut it on the band saw, and then sanded to a smooth finish,

                                      Drilled the oval hole to fit over the rudder stock and trimmed all off at the top of the rudder stock for the tiller to fit onto the stock end.

                                      From the overlay on to the plan, the tiller clears the steering box perfectly.
                                      Job done.
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                                      #101782
                                      Richard Simpson
                                      Moderator
                                        @richardsimpson88330

                                        Rudder looks good Neil. Beast of a rudder for a beast of a boat!

                                        #101783
                                        neil hp
                                        Participant
                                          @neilhp
                                          Posted by Richard Simpson on 25/08/2022 19:28:36:

                                          Rudder looks good Neil. Beast of a rudder for a beast of a boat!

                                          You're right there Richard,…….

                                          Its a struggle to get it in and out of the workshop and in too the garden at times, as there is nothing to hold on to…….

                                          but just looking forward to those first set of mouldings to come out of the mould.

                                          #101784
                                          neil hp
                                          Participant
                                            @neilhp

                                            By the time I'd finished and laquered the rudder and tiller, posted a letter to the FSA and a few other jobs the sun had gone in and dark clouds were on the skyline.

                                            And so I decided to "rivet" the plating on the engine casing.

                                            No!, not with rivets, but with a small tube of waterproof textile paint that comes with a thin nozzle.

                                            Took me aproximately 15 minutes to rivet the casing, instead of god knows how many hours of marking, drilling and gluing in to the wooden casing, small engineers rivets!.

                                            I know which I choose every time.

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                                            #101787
                                            neil hp
                                            Participant
                                              @neilhp

                                              The cabin/engine casing are now ready for moulding, and I have decided for this to make a 3 part mould.

                                              But firstly, I have to fix a base flange to the mould.

                                              Using the hardboard base of an old drawer I cut to rough size on the band saw, and spred aliphatic resin to the base of the cabin.

                                              I then weighted the cabin/engine casing to the flange using A LOT of old batteries that I have collected over my many years of model ship building. They really do come in well for gluing decks to their supporting beams……..get collecting folks, lol.

                                              I'll leave it a few hours to set, before strengthening the two halves, as it had to be fabricated in two pieces, as I didn't have a drawer bottom long enough.

                                              Once set, I can make the next two parts of the moulding flange.

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                                              #101818
                                              neil hp
                                              Participant
                                                @neilhp

                                                And a swap from the plugs tonight, to the Rudder assembly.

                                                Tonight I fabricated the "tiller arm" for the rudder from an inner core of 4mm obeche, lined with a piece of old oval plastic, and two plates for the upper and lower arms.

                                                After gluing the rectangular pieces together I sanded them to shape, drilled them and set into the holes some 3mm outer dia brass tube to take the servo links.

                                                It fits nicely on to the rudder stock.

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                                                #101819
                                                Ray Wood 3
                                                Participant
                                                  @raywood3

                                                  Hi Neil,

                                                  I like the way you jump around the project making some of the final fix items

                                                  Are you going to make the GRP mould from the plug yourself ??

                                                  Thanks for the tip on the Silver rivet stuff mine turned up from Amazon on Saturday, my Hurricane has hundreds of rivets on the wings which will look good peeping through the camouflage.silver rivets 300822.jpg

                                                  Regards Ray

                                                  #101824
                                                  neil hp
                                                  Participant
                                                    @neilhp

                                                    I tend to work on a board on a dining chair in an evening, Ray, sat in front of the TV and do the small bits that come to mind as i browse through the plans and pick up as not yet done……………so all a bit higgledy piggledy in my method………..

                                                    and then as the boat comes together towards the end i have a mass painting session lol.

                                                    To answer the question about the fibre glassing, i am running a thread on Facebook in one long post……….as it is so long it would take up too much space on here for the few that might be interested in the process from start to finish.

                                                    But if people wanted me to publish it on model boats i'll set up a new thread………but it is a long preperation process.

                                                    And yes, I will be producing the moulds and mouldings……..I was, until retirement, as a woodwork, graft design and tech drawing teacher teaching at after school, in school and nightschool, techniques in GRP laminating for over 35 years…….and it is one process I love from start to finish………

                                                    This is the start of the process, as up to date as of yesterday, 29th August. on facebook, but if there is interest on her i can set up a section for grp laminating.

                                                    RNLI RC LIFEBOATS | I am NOT going to put the next process off any longer and is probably one of the most enjoyable jobs I like in model boat building | Facebook

                                                     

                                                    Just let me know if you do.

                                                    Edited By neil howard-pritchard on 30/08/2022 11:08:44

                                                    #101825
                                                    neil hp
                                                    Participant
                                                      @neilhp

                                                      Always fancied building an aeroplane as my father flew navigator in Mosquitos for a short while, but i am so clumsy sailing boats that it would be matchwood within seconds of take off………..

                                                      just admire others that do………….

                                                      and that looks superb Ray…….. and glad i was of help.

                                                      Edited By neil howard-pritchard on 30/08/2022 11:27:07

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