Nutshell Pram Build (Part 1)

   

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I’m finding that I quite enjoy the process of studying, planning, and building small wooden boats. The process of visualizing the shapes, details, and sequencing of building a boat scratches a lot of itches in my brain housing group.

Prior to purchasing the Tartar Sauce, but during the “I’m going to buy a bigger boat” phase, I had purchased an inflatable dinghy on the internet. Unfortunately, the dinghy I purchased ended up being too big to stow on the deck of the Sauce, and I don’t want to install davits on the stern. Hoisting a 100+ pound dinghy on davits off the transom would look unwieldy on such a short boat as mine, as well as having negative effects regarding windage and balance of the boat. Thus, it became more and more imperative that I source a new, smaller dinghy that can serve as a tender. Also, my son has been showing a lot of interest in getting into dinghy sailing, so having a dinghy that can serve double duty as both tender for the Sauce and a kids beach-comber would be ideal.

I began to research dinghy plans available on the internet that fit my parameters: plywood dinghy with row, sail, and motor capability; less than 8’ long, to fit on the cabin top between the mast and the dodger; maximum payload capacity (hopefully to get 2 adults and 2 kids in, but at least 2 adults and 1 kid); and lastly, it has to be a pretty little thing. I decided on Joel White’s 7’-7” Nutshell Pram.

I purchased the planset from http://www.woodenboatstore.com, and set about studying the plans and visualizing how to get this thing built. Wooden boat store also sells an instruction book, but I decided that my hubris and moxie should suffice in lieu of official instructions. Luckily, I found a source for Douglas fir marine ply in town, at pretty reasonable prices too. After compiling pretty much all the lumber and accessories I’ll need to build it, I got to work.

The first step to building a boat is to make a strongback ladder frame. This frame forms the foundation on which the rest of the hull is shaped. For a small craft like the nutshell, a simply 2×4 frame is sufficient, and Mr. White includes a sheet in the planset for the dimensioning and construction of the ladder frame. Once the frame was built, I laid out the station molds for stations 1 and 3 on some 1/2” plywood, cut them out with a circular saw, and then mounted them on the ladder frame.

Nutshell Pram ladder frame with station molds in place.

Next, I prepared the lumber for laminating the midship frame. My local big box store fortunately has a suprisingly good selection of straight, relatively clear Douglas fir 2x4s, so I used that as base stock. I first planed the boards down to about 1 1/8” thick, then ripped them on the table saw to thin strips about 1/8” thick. Next time I do that, I’ll fit a thinner kerf blade on the table saw. I used my thick kerf combo blade and lost almost half of the base material to the cuts.

The last task for the day was to lay out the laminating jigs. I started with a base of melamine plywood and drew out the patterns for the frame and the forekeel, which is the other laminated piece on the boat. Once drawn out, I cut clamping ducks and set them at each hard point on the pattern. I test bent a strip to ensure the strips I cut were thin enough to make the radiuses and didn’t have any issues, as long as I keep the few small knots off the tight areas of radius.

Midship frame and forekeel laminating jig

Next time, I’ll laminate the frames and layout plywood cuts – transoms, planking, floor, etc.

2 responses to “Nutshell Pram Build (Part 1)”

  1. Matt Adam Avatar
    Matt Adam

    Ripping big-box Douglas fir 2x4s into 1/8″ strips for the midship frame lamination is a smart workaround for not having clear stock on hand. Curious how the forekeel jig turned out next to it. If you keep logging this (and the Mill Creek before it), boatbuildlog.com/designs is a nice spot to track builds like this. Looking forward to seeing the planking go on next.

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    1. Dylan s Avatar
      Dylan s

      Thanks for the comment! I added a new post for the rest of the build – It’s been a busy summer and I haven’t been doing much writing, but your comment reminded me to finally write a follow up.

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