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>> Home > Tags > bulkhead

bulkhead
bulkheads
bulkhead
Fairmile D 1/24 Scale Build by reilly4 Fleet Admiral!   Posted: 1 day ago
Sakibian, My friend Graham built his E-boat with a fibreglass hull but scratch-built everything else. He does magnificent detail work. For you to build this hull you first need to get the plans to the scale you want to build. 1/24 is good for these models. The cross sections are essential. You need to determine how many bulkhead frames you will require. You won't require as many as shown on their plan and photos - maybe less than half - as many as will enable you to support the stringers to give you a shape of the hull on to which you can fix the planking or skin. The frames you choose need to be at or very close to cross sections, so you can use them to mark and cut your frames. I use 5mm plywood. There is a photo of my Fairmile D frame earlier in this series of posts. One of my earliest posts on this website was a Youtube video with the E-boat and my Fairmile D in action with sound effects.

The bow blocks & outer keel by robbob Fleet Admiral!   Posted: 17 days ago
The bow of the boat has a compound curve and to create the shape a single block of hard balsa is supplied in the kit, although in my pre-production prototype this had to be formed by laminating some pieces of thick balsa together to the required size. Rather than laminating up a single block separately I did the laminating and glueing in situ on the hull to ensure a solid tight block, and after the glue had cured I set about shaping it. Initially I used a razor saw to roughly remove the surplus at the sides and bottom and then began the process of shaping it to the final form. My sanding plate proved invaluable for the final stages of making the block flush with the hull sides. The underside of the blocks were very carefully shaped with a combination of the sanding plate and abrasive paper around a series large round formers. I was careful not to just use abrasive paper over fingers as this can create grooves and unevenness in the soft balsa. I had already created a concave shape in the bulkhead former F1 and with the ply bottom skins in place it was relatively easy to extend the contour into the bow blocks being very careful to ensure symmetry on both sides. A line was drawn on the blocks that extended the curve of the hull strakes to define the shape. I also used the outer keel as a template throughout the shaping process to make sure that I was not removing too much material. It would be very easy to remove too much material so it pays to do this slowly and carefully, checking all the time for symmetry. Finally when I was happy with the shape I formed a slight flat on the blocks for the outer keel to sit on, using a back light helped greatly with this, and the whole hull was given a light sanding with a detail sander. The prototype kit was supplied with keel components made from thick balsa which would easily be damaged in use so I recreated this in thick ply laminations to the required thickness and shaped it so that it was completely flat and square on the inner edges and with a curved profile on its outer edges. The keel was checked for fit on the hull throughout so that only a minimum amount of filler would be required to blend it to the hull. It was fixed in place with epoxy adhesive and firmly pinned until it fully set and very little filler used to finish it. The kit, which is available now from VMW, includes a single piece bow block and ply keel parts as standard, which makes construction much quicker and easier. I’m glad that bit is over and I’m very pleased with the result. Next stage will be glass fibre cloth and epoxy resin….

Plumbing the water-cooling for the ESC by robbob Fleet Admiral!   Posted: 25 days ago
The HobbyKing ESC I’m using has the facility for water cooling and as it will be in an enclosed location without any free ventilation it seems sensible to utilise this feature. To keep the water circuit as short as possible I will put the pickup just behind the propeller and the exhaust on the stern but as the boat has a bulkhead just in front of the stern skin I need to make an access hole through it to allow me to secure the nut on the stern skin. I made a hole through the bulkhead large enough to get a socket on the nut and reinforced the hole with a ply plate, similarly I reinforced the inside of the stern skin where the outlet passes through it. When I was happy that the arrangement worked and I could attach the hoses and securing clips easily I glued and pinned the stern skin to the hull. The water pickup is a standard one that is readily available but it’s supplied with overly large and ugly fixing nuts, the inside one is of no consequence but I thought that the outer one needed smartening up so I put it on a threaded rod and locked it in place with another nut and put that into the chuck of a drill and used a file to re-shape the nut to a pleasing taper….who needs a lathe......😜 I had to reduce the height of the inner keel former as the pickup tube is not long enough to get a good fixing with the internal nut, as the inner keel is balsa I fitted a ply reinforcing plate to spread the load. The last ‘photo shows the location of the ESC, main battery fuse and receiver. The hoses will be secured to the ESC with spring clips throughout. I found that the silicone tube I use tends to kink rather easily if the radius of a bend is too small and I found it necessary to form a tight spring coil around the piece that loops the water back through the ESC to prevent this happening.

Sea Queen Frames by DodgyGeezer Lieutenant   Posted: 1 month ago
"Well I sent him an ebay msg expressing how displeased I was with the quality of his High Standard drawings and he said send them back for a full refund , so thats fair enough I suppose. Its just a shame that a lot more people will also fall for the same thing ." I do not publish plans of the Aerokits boats on my website, because they are still under copyright and being sold commercially, so I wonder if these plans are being sold legally under license or not? The fact that the bulkheads are badly drawn suggests the latter.... Providing a complete refund minimises the risk of you leaving bad feedback - which is the only thing these sellers are scared of.

Internal wiring & bottom skins by robbob Fleet Admiral!   Posted: 1 month ago
Because I am keen to conceal as much of the wiring as possible I have decided to place the battery at the bow and the operational equipment at the stern, the engine on the original boat was central and covered with a soundproof box and this is convenient as the motor can be positioned and concealed in the same way. This means that some of the wires will have to run the full length of the boat and the easiest way to conceal them is to run them beneath the ‘box’ around which the hull is formed, and this needs to be done before the bottom skins are fitted. Holes were bored through the bulkhead formers under the port side of the hull and battery cables were run to the stern where the ESC will be and three motor wires from the ESC run to the centre, emerging near the motor position. For good measure I put in a servo cable and a separate draw wire just in case I needed to put more cabling in for any additional features, perhaps working navigation lights? Satisfied that I had all the cabling in place I was able to fit the bottom skins starting with the starboard side first. Before doing so I put a very slight 'hollow' in former F1 which should help blend the shape of the the hull where the ply skins meet the balsa blocks that will to be carved and shaped to form the bow. This can be seen in the last picture. The process of forming and fixing the skins is the same as for the side skins but in addition to the pins holding the skins in place I used some brown polythene ‘packing tape’ to pull the skins tightly against the bulkhead formers and strakes. The packing tape has a very high tensile strength and is ideal for this, and of course cheap and easy to remove. Once the aliphatic glue had set thoroughly overnight I removed the excess from the skins with a small block plane and finished them with my sanding plate. Before I fit the skin at the stern I will have to arrange the water cooling for the ESC, with the pickup just behind the prop and the outlet on the stern. I’ll cover that aspect in the next update.

Fitting the side skins. by robbob Fleet Admiral!   Posted: 1 month ago
The side skins are made from 1.5mm ply and require a slight curve towards the bow and I found that this is best achieved by gently warming with a heat gun, which seems to relax the glue between the laminations, so that when bent to a gentle curve and allowed to cool will set the shape very easily. The skins are supplied are slightly oversize and when the skins have been bent they can be roughly clamped to the hull and then marked for trimming, also while the skin is clamped in place the positions of the bulkhead formers can be marked on the skin. Back on the bench the skins were trimmed with a craft knife (with a fresh blade) and then drilled with a 1mm bit to allow pinning through into the formers and strakes. Aliphatic glue was applied to the hull formers and strakes and the skin positioned so that the drilled holes were in correct alignment with the formers and then clamped and pinned in place. Because the skin was pre-formed to the hull shape the clamps and pins are not under much tension and the hull was set aside while the glue set. When the port skin had fully set overnight, the pins and clamps were removed and the skin was finished with a plane to remove the excess down to the strakes and the F1 former at the bow and the sanding ‘plate’ used to finish it all off. Where the side skins meet at the prow there needs to be a wide flat area for the external keel to butt to and so the trimming and sanding there will be done at a later stage before the bow blocks are fitted and carved. The process was repeated for the starboard side skin and while the glue was setting I gave some thought to a means of concealing some of the wiring that needs to run the length of the hull 🤔.

Stern & keel formers by mturpin013 Fleet Admiral!   Posted: 1 month ago
I have found as you have that gluing your abrasive paper to a wooden block is far better than wrapping and making sure all the bulkheads and other skin supports are at the correct angle can make a real difference to the line of the hull, only noticeable when looking down the length of the hull when painted and that's too late to change things. I also make a number of different shaped sanding blocks/sticks down to using the coffee sticks with abrasives stuck to then for getting into difficult areas.

Stern & keel formers by robbob Fleet Admiral!   Posted: 1 month ago
Various small pieces, S8 & S9, are added to bulkhead former F7 that create the curvature of the stern which in turn support the outer skin, in addition there are some pieces that are fixed either side of the keel as laminations to add strength and to support the bottom skins where they meet the keel. The prop shaft has yet to be delivered so I used a length of 8mm plastic rod temporarily in its place so that I could fit the keel laminations K5 around the shaft. I chose to fit additional pieces on either side of the keel between the bulkhead formers to support the bottom skins and some extra pieces of balsa were fitted at the stern to support the outer skin, and in a similar fashion some extra pieces fitted either side of the keel formers at the prow. Once all these pieces were firmly set they need to sanded to the profile of the hull, and this is best done with abrasive paper around a sanding block. I made a sanding ‘plate’ from some 6mm MDF with a sheet of 120 grit aluminium oxide abrasive paper glued to it to form a perfectly flat sanding surface and this was used to chamfer and flatten the bulkhead, keel and chine formers so that the outer skins would lay as flat as possible across them. I also fitted some pieces of ply under the centre section of the box around the keel to reinforce the area under where the motor mount will be as I don’t think the balsa base of the ‘box’ will take screws firmly. The next step will be to fit the side skins and then the hull will really take shape.

Upper & Lower Chines by robbob Fleet Admiral!   Posted: 2 months ago
The next stage is to assemble and fit the upper and lower chines to the bulkhead formers. Each chine is made from three parts that are step jointed together, the instructions recommend using the plan to ensure correct alignment with a protective transparent paper between, however the cutting accuracy of the parts is such that having checked the alignment over the plan I was confident that assembling and glueing them together on the cutting mat would be OK. The upper chines were assembled first and when set were glued and pinned to the tops of the bulkhead formers with the fronts butting against the K1 keel former at the prow. The lower chines were assembled in the same fashion and when dry are glued and set into the slots in the bulkhead formers. Finally the stern former F7 is added and the whole assembly set aside to dry. The hull is quickly taking shape now and even at this stage is very rigid and yet remarkably light.

Assembling the keel & adding bulkhead formers. by mturpin013 Fleet Admiral!   Posted: 2 months ago
Now Plank on frame really sets my imagination going, I have to say that i am a builder rather than a sailor and get immense pleasure from problem solving and just creating structures. I will be looking for a suitable subject after the Crash Tender which at the moment is taking some time with fiddly bits that don't seem to advance the the overall vision of the project so apologies for the lack of "blog" Any suggestions?

Assembling the keel & adding bulkhead formers. by robbob Fleet Admiral!   Posted: 2 months ago
Hi Mike. The majority of Phil Smith's Veron designs were around this principle, just as the Aerokits/KeilKraft designs were based on the 'egg crate' method. Both methods are very successful and popular over the years as many modellers will attest, and the hull can be completed really quite quickly. 'Plank on frame' is probably as common if not more and a great deal more time consuming but far better able to reproduce complex hull shapes. Never tried the latter..perhaps one day.

Assembling the keel & adding bulkhead formers. by mturpin013 Fleet Admiral!   Posted: 2 months ago
Looking good although I had not seen the method of building round a box before, it takes some time before the shape of the craft can be seen.

Assembling the keel & adding bulkhead formers. by rolfman2000 Fleet Admiral!   Posted: 2 months ago
Coming along nicely Robbob. As the saying goes "Don't talk to me about balsa bow blocks" 😆 And yes, you don't have to do those yet lol. I may just follow you with one of these to run alongside my original Veron one from 1966/7. Hope they have them for sale soon . Best wishes, Dave W 😊

Assembling the keel & adding bulkhead formers. by robbob Fleet Admiral!   Posted: 2 months ago
With the box assembled and the glue fully cured the next stage is to glue the inner keel parts together and fix it to the underside of the box. The keel consists of four pieces that need to be jointed whilst on a flat surface, the instructions suggest that the parts are best assembled whilst laid over the plan with a transparent protective sheet between to ensure accurate alignment. A gap is left in the keel for the prop shaft and this gap is laminated over by some additional keel pieces on either side. I chose to deviate from the instructions here and fit these pieces after the prop shaft was in place to ensure a snug fit, I have it on order from Model Boat Bits along with the prop and rudder. The assembled keel is glued in place along the centre line of the inverted box and when dry the bulkhead formers can be added. The positions of all the formers are clearly marked on the box and the underside formers are added first followed by the side formers and lastly the bow formers, and the assembly set aside to dry. I’d almost forgotten how easy it is to work with balsa, it takes glue and pins readily and assembling this model is a joy, however, shaping the solid balsa bow blocks to the correct profiles will be an interesting challenge. But I don’t need to do that for a while yet.

Scratch built yacht. by ChrisG Lieutenant   Posted: 2 months ago
I am thinking of building a new sailing yacht from plans which I have yet to acquire. I have 8 A4 pages of drawings of a Goth-USOM from Frank Russell 2014, not sure where I got them from and if they are worthy of the time and effort. The size is about right at 1000mm length and about 1500mm deck to masthead. I have had dealings with Nylet in the past and am sure they would be helpful for rigging, sails etc. I plan to plank build the hull onto wooden bulkheads. Although I have built several model boat hulls using this method before I wonder if I could enlist some help or recommendations from any other members of this group ie choice of plans, how to do it books. Many thanks Chris G