vaddoc

You are having too much fun GL! Lovely boat, I like the colour combination a lot. Looking forward for the rest of the journey Vaddoc

Very nice work on the rabbet, I guess your chisels are razor sharp! Very crisp edges, I always struggle and end up with wider margins and irregular surfaces.

Good news! No need for concern, the plank shape and run is fine! The computer can unroll a curved surface to give the straight surface it originated from, very useful when it comes to planks. The shapes I got were odd, and despite what the software was saying, eyeballing the hull they did not make sense. The problem was that really, CAD is very unforgiving. The hull is curved and fair but the planks are flat. I divided the hull to planks widths and asked it to unroll but this sections were curved and hollowed along their width, following the contour of the hull and not flat. This led to funny inaccurate shapes! I created a random sheer plank but made it flat this time. The result was much closer to what I expected. The plank blank now needs to be 39 cm wide which is much more feasible. Another interesting snapshot is the following, comparing my frames and sheer to the plans as given. The sheer is spot on as well as the aft frames. Note frame No 1 is identical and frame 2 and (to a lesser degree) frame 3 quite a bit different due to the errors and difficulties we discussed above. So all is good, the only minor loose end left is actually building the boat.😁 Putting all sort of disclaimers on accuracy of lofting etc, if any of you have an interest to build this boat let me know, I am happy to share these plans. Regards Vaddoc

Now I played a bit with the planking and odd shape planks come out. So odd that I now have two questions: 1. Can all boat shapes be planked? 2. For these period long boats (7 m long!), is it always one piece plank or is it common practice to scarf planks? There are other boats 35 ft long which is 11 m, so these cannot be one piece plank. The reason is that the initial tries show planks very curved at the transom end, which would need 50 cm wide blanks to come from and would have the grain running almost vertically at the aft end. This seems to happen because the hull at mid sheer runs vertically down wards before turning towards the midline and there is a pronounced curve of the sheer at each end. Looking at the NMM drawing this is indeed how the boat is drawn. More headscratching needed!

Druxey, indeed! GL, it is really not that difficult. Get any CAD, draw a dot, then another one, then connect these with a line. You 're off to a good start! The rest is improving on this! Keith, I actually do have access to a massive CNC mill but it feels a bit like cheating! I would sure like a bench top milling machine though! Bob, you are very correct, CAD (Rhino, well spotted) is very unforgiving and indeed this degree of accuracy is not necessary. I am aware that when actually cutting the wood the tolerances will be just horrible in CAD terms, nothing that sand paper or filler cannot fix. This however is a small boat so it was feasible to get all lines to work together. These guys of old, cutting wood without power tools and following some drawings where even one copy was not identical to the other...but I read that it was not unusual for ships to be a bit asymmetrical! In the end of the day, the ship has to be built! The picture you paint I think was their reality. Now I was indeed tempted to draw the planks, which would be a lot of work being a lapstrake. It is unnecessary though as I ll do the planking the old fashioned way but I will divide the hull just to get a nice run of the planks. I ll post this images later on I actually have in a couple of weeks another few days of computer time, I might be tempted to loft another boat or even something a bit larger. I ll have a look through the NMM plans. Regards Vaddoc

Just went through the log Michael. I was left speechless. Wonderful work! I am clueless in this area but could I ask, how are all this moving parts kept lubricated? There are no sealed ball bearings, just metal on metal. I presume there were no ball bearings in the real thing either.

Well, two new things to announce. First that the hull is finished. Secondly, I discovered another mistake! This one was in front of my eyes since the beginning. Simply, the body plan lines are indeed to the inside of the skin, but all other lines are to the outside! This is dead obvious looking at the drawing. What a mess! I have drafted all lines to the inside of the skin. Still, with a plank thickness of 2 cm (so that in 1:10 would be 2 mm), the error is not significant but could explain why I had such difficulties to get the hull to work. Still, lofting the profile view to the inside of the skin instead of the outside, creates some unique new problems that I had to overcome. I will try to explain these with some images. As I have defined the inner skin, I can easily get the shape of the frames at any position. What is left is the rabbet line at the keel, the stem and sternpost. To get this line, the outer skin is needed. This was very easy to get by asking the computer to offset the inner skin by 20 mm which is the plank thickness. Now, the rabbet line (the line the outer skin meets the keel) should be horizontal at the keel. The reason is that this line is given straight and the lofting is done on this basis. But I lofted considering that the bearding line (the line the inner skin meets the keel) was straight. So the skin pivots against the bearding line and the rabbet came out curved in two planes. The next snapshots show the problem. This is the face view of the two skins, the keel area is magnified in the second snapshot Nothing I can do for the bend downwards. To level things off however, the keel surface needs to come out and meet the outer skin. So I trimmed all lines to the same level. No idea how this will work when planking but the difference is about a mm or so. I think it will be fine. In profile view, the rabbet takes a small dive but it should not be visible. The black line is horizontal and the red line is the rabbet After this there is not a lot really to do. I projected the part of the transom that meets the planking just to see the bevels and the shape of the sternpost. There should not be a need to fair the frames at all as all the bevels will be known and cut in advance. Joining the two halves with a keel 80 mm wide gives us the final boat shape with the inner and outer skins I now need to decide whether I will use steam bent ribs or solid frames. The position of the temporary molds for the lapstrake planking will be such that the same screw holes would be used for the molds and the permanent frames. I would like to leave the planks unpainted so no rogue holes allowed. This might change though. What is needed now is to finalise the shape of the stem and the transom and to figure out the positions and shapes of the frames and subsequently the positions and shapes of the molds. I ll do this when I am ready to start building this boat. A couple of cant frames will be needed as well I ve learned a lot from this exercise and I dare say I now understand boats better. The error in lofting did not change the shape of the boat significantly as it was limited only in the rabbet and also due to the small thickness of the planking. This is good as I do not think I could start over for a fourth time! Thank you all for your likes Vaddoc

Indeed, epoxy is alkaline and vinegar being acid destroys it immediately if uncured. But: Slowly (or less slowly) hypersensitivity will settle with epoxy so best to always wear gloves

Small tip: vinegar removes uncured epoxy. Best thing to clean your hands.

Depending on the type of work you ll be undertaking maybe also budget for fire extinguishers and a fire blanket ( to be placed near the exit) Some form of dust extraction/management

Indeed a great opportunity Hank! No doubt you ll end up with a fine shipyard. You might need to revisit your lighting. I converted my single garage to a shipyard, it has brick unpainted walls and no ceiling. 5m x 3m approx. I installed what I thought was massive lighting. 4 double fittings, 5 feet each fluorescent, overall 8x52W concentrated only at the first half of the space. Not enough. I installed an extra 4 double fittings, 6ft each this time. Brighter but for the detailed work I do I could use even more. If I could paint the walls white there would be no problem. Also, it is important for light to come from all directions so there will be no shadows Vaddoc

Dear friends After endless pains and buckets of digital ink, lofting is done (-ish)! A few pictures: I had to add 2 waterlines and one more diagonal and eventually, lofting to the waterlines was the most efficient way and only took two cycles. Now, I honestly think that there might a bit of a problem with the lines in the original drawing. Of course it is a thousand times more probable that my lofting skills are inadequate rather than the long dead builder making a mistake but I absolutely could not make the thing work in regards to frames 1 and 2. It was coming out very wrong so in the end I had to keep close to either. I chose to keep close to No 1 frame which, being the closest to the bow, should had a stronger influence in the shape of the hull. As a result, all the other foreward frames had to change a bit. Still, I am not too far off the original frame shapes. Now, this is the INNER surface of the hull. It seems this was common practice at the time which is unusual today as almost all plans give the lines to the outside skin. I now need to project new frames to the surface. The computer smooths things out by creating the surface so the new frames that will be produced will be very fair. Then I ll need to create the thickness of the planking and create the outer skin. I will also need to decide the thickness of the keel, adjust the Transom, create the bearding line etc. Tons of work! I also would like to publicly declare my huge respect to all of you that can pull something like this off without a computer! So all good so far unless I discover a catastrophic mistake. A final screenshot and to be continued!

Hope I am not too late! Great project, I ll be following. What is the massive gun in the background? Vaddoc

Welcome Pannonicus! I have recently been wondering how laminated paper/cardboard might work so I would be very interested to see your work. Looking forward to your log. Regards vaddoc

Welcome Retroship! Have fun building your ship and do start a log! Vaddoc