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Did some putty job on both sides. Still a lot sanding to do. And put some white paint inside. It will make it look bit clean and also work as a layer. Will prevent the water reaching ply. Beside of it a small cabin cruiser.
The tin can that I used is from a small tomato paste sauce from the market. Use whatever tin that you would like or can find. Look at my sketch to see how it needs to function and adjust your design to what enclosure is available to you. Lots of ways to do it, just make sure you have these points covered: 1. Method of attaching a fan to push air into the unit. 2. Place for output stack / tube. 3. Method of mounting a wick with heating element attached that can sit above the fluid level. See sketch in previous post. First photo, I cut three holes, each sized to fit the brass tubes and fan opening. This tin is thin and easy to poke holes in. I start by marking the opening locations with a marker, them I use a small sharp awl or pin to stare a hole. With hand tools ( power drill will easy shred the can, be careful) I enlarge the holes with small hand drills or reamer, found files, etc, I rotate the tools slowly in the opening and gradually enlarge it to size needed. Then I cut brass tubing to length with a small hand held hobby razor saw. Our in place, apply flux and solder. Once heated properly the solder flows easily.for the larger fan opening, I then used a dremel tool with sanding drum to make a nice round opening. The fan has corner openings for screw mount. Secure with some tiny sheet metal screws. Next I will build an enclosure around the fabpn edge to fit the round can. Might just use silicone caulk. Note, I did not open the can with a can opener, left the ends in place and poured the content out thru the holes made, Yes, it's a bit messy and wasted the sauce, but it's a cheap way to get an tin enclosure. More to come. Please give me feedback, am I being clear enough? Thanks, Cheers, Joe
here is my Robbe Sirius, the Stock maritime tuned version. I traded an iphone 5c for this model. it was in a used state without any working electronics. Completely removed all electronics, stickers and rigg and started with sanding. resprayed the hull in oyster 'pearl metalic' and started building up with new fittings , electronics etc Sails like a beauty !
Once again a piece of precision planking, the end product is always dependant on good planning and preparation, I used black card as my caulking (its available in a variety of thicknesses) and my thought was that it would not require any special pre- treatment other than sanding sealer and lacquer. Does the plasticard need a plastic primer?
The kit I’m constructing is a pre-production prototype and consequently it does not have the ‘laser etched planking’ feature that has been subsequently introduced in the final production kits on the ‘upper’ deck and the ‘well’ deck. This is of no concern to me because I think I prefer to do my own planking anyway but I do have to do a bit of preparatory ‘laying out’ of the deck pattern to ensure that it’s symmetrical and laid in a pleasing fashion. I have chosen to use 1.6 mm x 9.5 mm obeche hardwood strip-wood (from SLEC) for this with a thin black plasticard caulking between the planks. This is what I did when I constructed the VMW Fire Tender and the result was very effective and visually pleasing. Obeche has a pleasing grain, takes stain very easily and is also considerably cheaper than mahogany which I feel would be far too ‘dark red’ when finally lacquered. Because I wanted an outer curved plank around the hull edge I had to cut this from 1.6mm obeche sheet to the correct shape and width as it would be impossible to bend a strip to this extreme curve. These also needed a section trimmed out to allow the bow gunwales to be positioned correctly. Once both sides were cut and shaped I could then form the ply gunwales to the correct curve by my heating and bending process and glued them down to the deck. I understand that on the production kits these gunwales are now incorporated into the side skins which will make the construction a bit easier. The remaining outer planks on the hull edges were made from straight lengths of obeche but required some easing cuts so that they could be bent to the curve of the hull. Hopefully these cuts will not be too noticeable in the finished deck. When all the edge planks were glued in place I temporarily laid out the obeche planking strips with a thin strip of black plasticard as caulking and all held in place with masking tape. The centre plank was arranged to lie over the centre line from bow to stern. The setting out of the planks in this manner confirmed that the layout worked as intended and so I began fixing down the planking from the centre plank of the hull outwards with a fast bonding superglue and the process proved to be quite quick to complete. The side deck planks were equally straightforward but did require some to be carefully shaped in a tapered fashion at each end to fill the remaining gaps. The rear deck was also planked by working out from the centre plank and thankfully the planking layout matched and followed the bow deck planking perfectly. The surplus plasticard ‘caulking’ was then trimmed flush to the planks with a very sharp chisel and the entire deck rubbed down with my sanding plate until it was all perfectly smooth. For those building this model that don’t feel confident enough to do ‘real planking’ will probably want to make use of the laser etched planking on the ply deck panels to achieve a similar result with very minimal effort, but I quite like the challenge of doing it the hard way and the benefit of a slightly better finish.
This was the part I had been waiting for. As I was only 12 when I made mine, my Uncle Cyril was given the job of shaping, and he made a right pigs arse out of it. I had to do a lot of filling and sanding to correct it. I notice you had the "glad it's over" reaction. I reckon my reaction will be very similar. Thanks for sharing Robbob. 😊
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….
After completing the cowl, turned to the rear structure covering the gas turbine and other engine spaces. This can readily be made from styrene sheet. The sides and top were cut out, reinforced with “L” shaped angle and fitted together with CA glue. No particular challenges, other than determining where the various section transitions occur. Luckily had two different sets of plans to compare, so the nuances could be established. It was not until the rear structure was fitted into the cowl, the assembly fitted to the removable deck and placed on the hull, realized just how important this milestone was. Once everything is firmly located the accuracy of build becomes readily apparent. Any inaccuracies show up as an obvious misalignment. Was able to check the alignments and squareness using eye, rules, squares and a spirit level and was pleased with the outcome. A subtle sanding of about .020” off the base of one side of the superstructure and everything became square, parallel and correctly aligned. Quite a relief! Have always stressed the importance of accuracy throughout a build. This supported that recommendation. Once the superstructure was completed realized my plan to lift the deck off to gain access to the electrical control switches was impractical. Have thus cut a small access hole in the rear deck to facilitate access. Still undecided how to best disguise the hole, but at least access is now relatively easy. From now on, until the test program can be continued on the water, will add detail to the model. Doubt there will be much to describe is that of interest, or that has not been covered by others. Will continue this blog once there is anything significant to report. In the meantime, best wishes for Christmas and 2019,
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.
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 🤔.
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.
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.