Super Sail

While there is no question that Bolger’s Chebaccos are among the finest sailing, most beautiful and most versatile boats in the (known) world, that’s not to say improvements can’t be made. I was recently persuaded to enter my boat in the Shipyard Raid, a staged race from Gabriola Island, BC, to Pt. Townsend, WA., and decided that I’d attempt to optimize a few things to squeeze that last bit of speed out of Full Gallop, my sheet ply chebacco. The first thing that came to mind was: More Sail!

Figure 1 - Full Gallop at Sucia Island

An optional jib is shown on the plans, approximately 25 square feet in area, and recommended to be set flying from the stemhead. Since I had a perfectly lovely 2’ bowsprit fitted, primarily to carry an anchor, I decided that the standard jib would probably not set right, being carried too far forward. Additionally, others have reported that their jibs didn’t seem to enhance performance very much, if at all, and were a pain to set up. Some head scratching followed…

I didn’t have precise angles or sizes figured, but I did have the dimensions of the standard jib. Through calculations of center of resistance, center of effort, prismatic coefficient, and righting moment, along with making magic signs and uttering the sacred incantations, I expertly re-sized the stock jib sailplan.

Actually, I guessed.

I kept the leech and luff the same length, and increased the foot dimension, from 4’ to 8’. This increased the size of the sail to about 50 square feet, and helped move the center of effort (CE) for the sail back, to counter the effect of the bowsprit moving it forward. My intent was to keep the CE about the same, and since the sprit moved the CE forward 2’, the increase in the foot, to 8’ should move it back to about the same place, more or less. I hoped.

I spoke with the good folks at Sailrite, the sail kit manufacturers, with whom I have done business before. They’re experts on sails, kits, materials, and making things work well. Jeff Grant advised me that the standard jib arrangement on the standard boat probably didn’t work well because the ‘slot’ between the sail luff and the mast was so small that it probably channeled little wind to the mainsail, and may have even hindered the effectiveness. He further pointed out that, flown from the bowsprit, that problem would lessen, at least somewhat. The further forward from the mast the jib would set, the better for efficiency. It made sense.

Chebaccos’ front deck is tiny, especially if its pitching and rolling in a seaway. Since I didn’t want to have to try to stretch out to the end of the bowsprit to attach the sail to a forestay, I decided to set the sail ‘flying’. This involves incorporating the wire stay into the sail luff, instead of fastening it between the masthead and bowsprit. This wire-reinforced sail is then attached to halyards that hoist not only the top of the sail, but can pull in the tack as well, from a block on the end of the bowsprit. This let me lead halyards back to the cockpit, attach the sail tack and head, and haul it out to set on the sprit. Both top and bottom halyards can be tightened, and the sail is drawn as tight as possible. The sheets are rigged in the conventional manner, thru blocks lashed to eyes on the coachroof, and then to cleats. Now, with a little practice, I can set and strike the sail while standing in the opened hatchway, safe from spray and a potential swim from the foredeck.

Performance

I initially set the sail on a June afternoon with 8 mph sustained winds, with some gusts. It set perfectly the first time, and after messing about with temporary blocks to carry the sheets, I headed across the lake. It had been a while since my last sail, but I immediately felt the improvement in speed. Shortly, I was joined by a lazer sailor, who admired the boat, and, sailing next to me, coached me in fine-tuning the sail. The tweaks made some improvements, and were easily accommodated with the moveable blocks I’d put together (they were on loops of line that could be attached to coachroof or beam-mounted cleats). Eventually, I found that I could outsail the lazer on some points of sail, which surprised both of us “Hey, I’ve raced at the Lazer Nationals, and this is a fast boat. And you’re pulling away!”.

In hindsight, the sail could be made even larger, by as much as an additional 12”-16” on both the leech and luff. The 8’ foot seems about right, tho. I’m not certain how wise that much additional sail would be, except in very light winds. In the end, I’m pleased with the sail as it is, and even without the extra area, the improvements are noticeable. I can’t speak highly enough about the Sailrite folks – the kit was great, done quickly, and at just over $200, the price was right. Now, I’m just waiting to hear how good it looks from behind, as told to me by the other Shipyard raiders.