Running risks by ignoring experts….

Dan St. Gean, Chicago, Illinois

I wrote an article for Duckworks Magazine a while back outlining a multipurpose sailing and paddling boat that I thought would work for me. The objective was to build a 21’ outrigger canoe as a paddle craft with a single outrigger. Part two of the article was to make a sailing trimaran with a second set of crossbeams with a second float.

The final part of the plan I never completed was to make a catamaran for cruising with friends. I bought plans from Gary Dierking for his 18’ Ulua. This boat also has the ability to scale up nicely all the way to 27’ long if desired. He also included plans for a trimaran style of crossbeam. This is where I got off track.

I regularly use my father-in-law’s Hobie Wave. It is just over 13’ long and sports 98 square feet of sail. I thought my new outrigger should have more than that. I had a sail maker draw up and cut a 128 square foot sail. The foot of the sail is 11’ in length (bottom of the sail) to clear the long cockpit. It is a leg o’ mutton style with generous roach and a big reef point. It is also tanbark in color and beautiful!

This is NOT the sail that Gary Dierking specified. Can you see trouble over the horizon? Designers, believe it or not, actually have some reasons why they specify what they draw. I knew that. I also thought I knew better. For example,  Holopuni is a production Hawaiian sailing canoe. Holopuni models use a 100 square feet of sail. The same sail area is used by the Hawaiian Sailing Canoe Association on their racing canoes.

I scaled up the amas to an 8” diameter at their largest point and made them longer at 16’. Hopefully, they would stand up to my bigger sail without turning into submarines. I got the crossbeam dimensions from DGS Watersports, which builds racing canoes. Cool stuff and helpful guys.

I didn’t ask DGS about the float volume—big mistake. Another mistake was the mast I made ended up way too heavy. One error was picking up an aluminum tube that was double the wall thickness of what it was supposed to be. The one I got was 12’x .250” instead of either .156” or .188” max wall thickness. I also used bird’s mouth construction for the upper section using ¾” thick Douglas Fir. I did taper the staves on the table saw, which is a potentially dangerous and scary operation since the staves were 14’ long. Long story short—the mast is too heavy for easy stepping. The mast must be 40-50 lbs.

When all that weight was piled onto the canoe with an 18” overall beam and an 18’ waterline, my freeboard quickly disappeared. Two 200+ pound guys aboard didn’t help either. Both floats weren’t planted in the water, but it was close.

I found that the freestanding mast was plenty capable of supporting the 128 square feet of sail, but the hull wasn’t designed for that much torque and twisted a bunch in gusts. Stepping the heavier mast was a back breaker too. The lake where I usually sail has a rocky shoreline. I need to step the mast while afloat or standing on the dock with the bow jammed under it. Not a good time to have passing powerboats creating wakes! After nearly killing both myself and the boat, stepping that mast, I found I was looking into carbon fiber masts.