Split Junk - Part 2 (Test Build)

Being Part 2 of the Split Junk Trilogy. Part 1 discussed the Split Junk Rig and why I'm excited about it. This part will discuss my test build. Part 3 will discuss some particulars about sail panel design and construction.

Split Junk Model

The first thing I did was to follow Slieve's advice and make an extremely crude model out of general shop scrap. It cost nothing but several hours of futzing around. After deciding the dimensions looked right and doing some basic rigging testing like working the halyard and testing lazy jacks it was time to proceed to fabrication.

The natural testbed for a radical sail experiment is a cartopper, in my case Afternoon Delight (aka Addie). Here's a refresher picture of her original rig.

Addie: Before

Last time Addie graced these pages we had a fine adventure testing her rudder modifications which ended in breaking the mast step. I had already fabricated a replacement (intended for her original sprit rig) and tested it once. My expectation was that it would be in the wrong location for a Split Junk, but having already built about 7 mast steps I decided to use it anyway and expect to have to redo it.

I expected the sail would need several iterations as well. Working in IT, the concept of Agile Programming naturally comes to mind - let's call this Agile Boatbuilding.

Agile Boatbuilding

Agile Programming has a set of dictums:

  1. Make it Work
  2. Make it Right
  3. Make it Fast

Not too bad, but we can do better for Agile Boatbuilding

  1. Make it Cheap
  2. Make it Fast
  3. Make it Work
  4. Make it Right
Bill of Materials

So, let's make it cheap. Mission accomplished. You can see the money went to the most important bits (cordage and libation). I could have gone cheap with some Fleet Farm rope, but when you've got friends who sell good rope you don't buy cheap rope elsewhere.


First step was to 8-side the mast and put a ring bolt in the top to serve as attachment point for halyard block, lazyjacks, etc. I'll reserve the details of the sailmaking for Part 3.

Sail Hung

As you can see, the sail wants to cant forward at the base due to the peak of the sail. There are several ways junk rigs compensate for this (yard hauling parrel, throat hauling parrel, etc.). I opted to skip these complications and just rely on the downhaul. More on that later.

Redneck Mast Step

Knowing that the mast step was probably in the wrong place, I just chopped a 2x4, holesawed it and epoxy tacked it down. Varnish? I don't think so. Agile. The sprit mast didn't go all the way to the keel, so I didn't have that option previously.

Fully Rigged

With the mast step in place, the only thing left was to hoist the sail and rig the sheetlets. This took a bit of fiddling, but turned out pretty well. It's hard to see in the photo, but I used a rope tied to both gunwales with enough slack to clear the tiller as a traveler.

Sea Trial

The sea trial wasn't exactly under ideal conditions (blowing 20 with whitecaps), but given our motto here and the fact it was my birthday - what do you do? You "embrace the suboptimal" and go sailing.

Addie SJ ready for trial

The wind was blowing off the dock, and it was quite blustery. I rowed off the dock, hoisted the sail (downwind hoist) and took off down the lake. I was quite pleased until I got to the end of the lake and turned around to head back. I was making good speed upwind and seemingly wasn't having too much leeway (although that's hard to judge on a choppy lake). Remember when I expected the mast step would need to move? I was right. I couldn't make a tack to save my life. So I ended up rowing back, into a 20 knot wind. Rowing back across Cedar Lake seems to be a theme in the adventures of Addie. But sailing your science project on your birthday? Priceless.

What Went Well Room for Improvement Summary

The Split Junk is an extremely promising rig. It is fun to sail (and also to make). I'd say we got 3 out of 4 on the Agile Boatbuilding scorecard: Make it Cheap? (check), Make it Fast? (check), Make it Work? (check). Remaining item: Make it Right. There are a few shortcomings to my implementation, most of which can be fixed by simply adding or moving rope. The other downsides stem from using a boat which was meant to be a rowboat as a sailboat. This could be rectified by making yet another mast step farther aft. Maybe I'll go that route, but I've got another idea.

What happens next? Stay tuned. I guarantee there's more junk in my future.

Another Idea
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