Norwegian sailing pram by Kenchington – Model Shipways – 1:12

[SaltyScot]

9 hours ago, Kenchington said:

My alternative was to cut a new bottom piece for the step from the same sheet of basswood..... I made sure that the grain ran along the length of that bottom piece

 

Good call, Trevor. That was just a split waiting to happen with that grain on the footer the way it was.

[Kenchington]

Step 15, inwales, completed; Step 26, rubbing strakes, largely done; Step 40, display stand, begun

 

The pram has the upper edge of the sheerstrake sandwiched between 3/32-inch square-sectioned "inwales" (ugly term but I don't think there is a better, standard one) and 1/8-by-3/64 "rubbing rails" outboard, lengths of appropriate stock being supplied in the kit. The former need to be steam (or alternative) bent and I should have set that up to dry overnight. However, they are so thin that they dried quite swiftly, without loss of time. I bent them along the outside of the sheerstrakes, which worked well.

 

Getting them to fit inside was more tricky, as there has to be a 3-D bevel at each end, to fit against the transoms, while the length has to be just right to put both bevels into place. After a long job with the first one, I evolved a better solution:

 

With the bent inwale loose in my fingers, I held one end against the edge of the transom and drew a pencil line where transom and inwale crossed. After bevelling to that line, I worked by trial and error, first adjusting the second dimension of the bevel, then perfecting the fit (or close enough to perfect to satisfy myself). I then turned to the other end of the inhale and shaped the much more awkward bevel against the bow transom. That gave me a bevelled inwale but one much longer than the space available. I dry fitted the bow end in place, clamping to the sheerstrake and working aft, until I could  go no further. The surplus end of the inwale projected outboard of the stern transom and above the sheerstrake. I penciled a length mark, removed everything, cut at the mark and then aligned the cut-off end with the new cut. With the old end as a guide, I started the bevel of the new end.

 

Because of the rake of the transom, there has to be quite a bit more shortening, in order for the aft end of the inhale to drop down, flush with the top of the sheerstrake. That shortening gives plenty of opportunity to perfect the bevel. So I clamped the forward end of the inwale back in place, gently pried the aft end away from the stern transom, sanded the bevel, dropped into place, lifted, sanded some more, dropped back ... and on and on until everything fit.

 

Compared to all that, applying glue and clamping in place was easy:

(I bought all those pegs because that's how many the hardware store sold in one pack. Never thought I would us them all at the same time!)

 

The instructions leave the outboard rubbing strakes until later in the build but I decided to complete the strengthening and stiffening of the upper edge of the hull at one go -- not least because it will simplify sanding everything flush. So, once the inwale glue was set, I removed the clamps, glued and place the rubbing strakes and re-clamped. That was almost too easy: No need for pre-bending, as the stock is so thin, no worries over length, which was trimmed after, not even any char to remove. Just glue in place with the upper edges of the three layers flush. Even that need not be exact, as the combination will have to be sanded later.

 

The combined effect looks good, though only a small advance in the past 24 hours:

 

While waiting for the inwales to dry in their new curves, I made a start on the display stand. When building my banks dory, I wanted an unobtrusive stand that would not draw the eye away from the model. What I ended with was a fully functional stand that is downright ugly. Not a problem with a model that hardly needs a stand at all but a lesson for the future.

 

The pram has a long daggerboard, which necessitates a tall stand that cannot be hidden. The model should turn out to be a pretty thing but without much point except its prettiness, so the very visible stand needs to complement, not detract from, the appearance. The kit stand comprises two shaped cradles elevated on dowels, rising from a simple baseboard -- simple, cheap (as it should be in a beginner's kit) but not attractive. The cradles are necessary and I will use the kit ones. The instructions do suggest replacing the dowels with clear acrylic rod. $10 to Amazon is bringing me enough for a dozen pram models. I also have the good fortune to be within easy reach of a specialty timber importer, where they put the offcuts from orders of exotic lumber into bins that locals can rummage through. $5 bought me more than enough jatoba to make a good, thick plinth (with a nice, rich colour) on which to mount the kit's baseboard. (For $35, I could have had genuine ebony but that would be hard to justify!)  So, today, I put a 45° bevel around the kit-supplied base. Tomorrow, I'll paint that and run the edges of the plinth past a suitable router blade to give them some interest. If all goes well, I'll glue the painted basswood to the jatoba and add the acrylic at the weekend.

 

Trevor

[SaltyScot]

9 hours ago, Kenchington said:

Because of the rake of the transom, there has to be quite a bit more shortening, in order for the aft end of the inhale to drop down, flush with the top of the sheerstrake. That shortening gives plenty of opportunity to perfect the bevel. So I clamped the forward end of the inwale back in place, gently pried the aft end away from the stern transom, sanded the bevel, dropped into place, lifted, sanded some more, dropped back ... and on and on until everything fit.

 

Wether they are called inwales or inhales (forgive my sarcasm, couldn't help meself  ), it sounds extremely intricate. Is the build on a Dory aways that involved?

[Kenchington]

And I thought I had caught and corrected all of the gasps! I could ask why the MSW auto spelling-corrector doesn't use a custom dictionary with common shipbuilding terms included, but it doesn't. Every "inwale" I typed became "inhale" until bludgeoned into accepting that I did intend the "w".

 

I don't know whether the pram is really so very involved. It can't be as complex as a rigged model of a three-master and I doubt that it is as demanding as a plank-on-frame model with an exposed frame. It doesn't even have hood ends fit into rabbets. The only thing that makes it complex is the desire (in a large-scale;e model of a small, open boat) to replicate every piece of wood in the full-size prototype. That and my intention to give mine a clear finish, hence to build without using fillers.

 

Wait until the build progresses to the metalwork. Then you can watch my fumbled attempts to meet challenges far outside my comfort zone!

 

Trevor

 

[SaltyScot]

4 hours ago, Kenchington said:

That and my intention to give mine a clear finish, hence to build without using fillers.

 

Which you are doing a fine job at by the way.

[Kenchington]

Thank you, sir!

[Kenchington]

Steps 16 & 17, quarter knees, Step 20, transoms completion, and Step 26, rubbing strakes: All completed

Display stand (Step 40) advanced; spar-shaping jig (part of Step 42) assembled

 

Today's principal task was adding the four "quarter knees", which lock the sheerline assembly (inwale, top of sheerstrake and rubbing strake, combined) to each of the transoms. The long arm of each knee, which fits on the inboard face of the inwale) only needed removal of char. The curved face needed that, edge softening and some rounding of the toes into nicer shapes. It was the short arms of the knees which needed work. The ones faying on the stern transom had to be bevelled to an angle that was off-perpendicular in two dimensions. The forward ones were simpler.

 

Seen from inside the boat, the knees are angled upwards across the transoms, as they are at right angles to the sheerstrakes, which are slightly flared. I followed a recommendation from a previous build log and marked where the knees should lie, as any asymmetry is liable to stand out like a sore thumb. At the bow, however, I already had asymmetry which had to be concealed a little. Not a big problem, however, and the knees were readily glued in place.

 

One point to consider, however: Under Step 53, a length of line has to be fed through a hole in each stern quarter knee (the line forming the mainsheet horse, though it is curiously called a "traveller" in the instructions). I don't think that the instructions say anything about those holes, except that the line must be passed through them. I decided to drill them while the knees were still in their sheet, which gave better control. The instructions call for the mainsheet horse to be made of 0.7mm line. That seems a bit small to me and I may use larger, so I drilled 1.4mm holes (having a drill bit of that size to hand). That will be small enough that a figure-of-8 stopper knot tied in 0.7mm line won't slip through, while making it easier to pass 1.0mm.

 

With the knees in place, the whole sheerstrake structure could be sanded to its proper form: Ends of everything sanded flush with transoms, then the ends of the rubbing strakes rounded off, the top surface of the inwale, sheerstrake, rubbing strake and quarter knees sanded flush (and perpendicular to the sheerstrake), finally the upper and lower angles of the rubbing strake rounded a little. (I have left softening the inboard angles of the inwale until the rowlock structure is in place.)

 

While I was at it, I cut off the extended parts of the transoms (which had served to hold the boat on its building board), sanded the transom tops down to their laser-cut marks, rounded everything off and finally filed the sculling notch in the stern transom. The instructions call for the latter step to be done with a 3/8" round file. As has been noted before on MSW, that should probably read 3/16. No matter: I had neither size but worked the notch anyway with both a small round file and a larger half-round. The end result of that effort is falling far short of perfection but at least is looking increasingly boat-like:

 

While all that was in progress, I put together the kit's jig for shaping round spars from square lumber -- mostly just because that let me consign the remnant of one basswood sheet to the scrap pile. The jig accommodates five spar supports but the kit only provides four. The easy solution, having bought the combo set of three kits, was to pirate a fifth support from the lobster-sloop kit.

 

A word of warning for anyone assembling one of these jigs: The supports are very slightly too big for the slots they have to go into. However, it is not the charred sides that need to be sanded. Those can be left full-thickness, for a tight fit, while the other faces are sanded. (I did take the char off surfaces that the spars will lie on, to avoid staining wood that I want to keep.)

 

I also primed the kit's display-stand base, while shaping the plinth that it will go on:

Just a simple ogive, in keeping with the clean lines of the pram. The jatoba is a much redder shade than appears in this image and will be richer still once oiled.

 

Next up: Framing the upper parts of the hull, supporting the thwarts and stern sheets.

 

 

Trevor

[SaltyScot]

2 hours ago, Kenchington said:

Just a simple ogive, in keeping with the clean lines of the pram.

 

That looks a lot like the stand I made today for the Endeavour. It is red oak coated with a red oak stain, which turned it a nice deep golden brown (more golden that the image is presenting). I finished off by sealing it with a Minwax finishing wax. It still needs another polish. Great minds and all that.......

 

 

[Kenchington]

1 hour ago, SaltyScot said:

Great minds and all that.......

Indeed!