Wednesday, February 10, 2016

Another Race to the Start Line?

Well, ok but not quite. I wanted to get another blog post done before I won't really have time. I have updated the photo album to the current day with 174 additional pictures so check them out here. The sailing canoe is painted and almost ready for paddling/sailing trials. Mast, sail, crossbeams and amas all are nearing completion. Soon I will be on the water doing some sailing, paddling and rescue drills.

A note on safety:
I will not be entering the race (the UFC in this case) unless I have time to sail and paddle the canoe in all of its configurations and complete rescue practice with simulated failures (missing ama/crossbeam) in all configurations. I would be literally "risking my life" if I was not able to regain control of the canoe in the event of capsize. Everyone should do rescue practice before going out of reach of help.

Now, I know what your thinking....Yes, my dad and I launched our CS-20 in 2008 fresh out of the workshop and into the Everglades Challenge but we were a 2 person team and the CS-20 design was well founded and well established. And yes, I did launch a 22' Trimaran in 2012 fresh out of the workshop (sailed only once before) and had some issues with it along the way. But it was also a 2 person team and we did not push the boat very hard. This year is the first year I will be sailing solo and in a smaller craft. For that reason, I am more cautious even if my mother is convinced otherwise (love you mom).

Getting back to the build, here is a little more info about how the design has evolved and some of the systems.

Then (above) and now(below)

Hiking vs. Sitting:
Originally, the idea was to use a relatively narrow beam and rely partly on hiking benches with ama backup. The advantages would be less ama interference with the water which would make the boat more upwind capable (that was the thought process anyway). This idea was thrown out mainly because it is not conducive to distance sailing. The new platform is about 11' wide with amas of approximately 70lb displacement. If there is time I will experiment with a hiking board which would be clamped transverse across the cockpit to allow for sitting up and out of the cockpit making for a dryer ride and more righting moment. 

The crossbeam consists of 3 pieces of aluminum tube joined with fiberglass collars for a slip fit. A central tube (purple) with smaller tubes outboard (green). This is the best configuration for strength rather than joining the tubes in the center and it is a more efficient use of cross sections because it is a better approximation of a tapered beam. Another unique feature is that the central tube can slide from side to side with 3 configurations. "Centered" in which the amas provide equal righting moment on either tack. Or "Asymmetric" either shifted port or starboard. This will come in handy on those loooong tacks down the coast because with the leeward ama slid farther out producing more righting moment, the boat will sail flatter and stiffer. An added benefit of this feature is for camping, the crossbeam can put in the asymmetric position to provide a platform for camping aboard that will not rock back and forth with every movement of the sleepy sailor. 

The amas are sculpted from solid 2lb density 2" blue foam fiber-glassed on the outside. They are approximately 8" tall by 6" wide and 63" in length. They easily fit inside the forward part of the main hull through the circular hatch. There is enough room left in the forward section for lots of gear. Mast and crossbeam tubes will also be stored there when in the paddling configuration. 

The amas will join to the crossbeams with a bracket that consists of a tube that slides onto the outboard crossbeam connected to a set of vertical "ears" and a saddle that matches the contor of the ama. The bracket will be bolted to the ama. The bracket must be removable so that the ama can be stored inside the main hull.

The bracket allows the ama to freely pivot about the axis of the crossbeam, a feature pioneered by Meade Gougeon and applied successfully in his sailing canoe. Limits for the ama's rotation will prevent the ama from rotating past about 5 degrees. The center of bouancy of the ama is slightly ahead of the crossbeam so that the ama will want to pitch up when pressed. 

The Mast:
The mast is constructed of 4 aluminum tubes the longest of which is 5 feet. Similar to the crossbeams, the mast is joined using the B&B system of fiberglass collars sanded down for a slip fit. Button clips will secure the tubes together and keep them secure. Each mast tube will have a foam plug glued into the ends so that each piece is individually buoyant.

The Sail:
The sail is a stock Spindirft 9 sail from the B&B inventory which comes with a single slab reef designed for single line reefining. A second reefing point will be added as a "deep reef" to satisfy the reefing rules. The sail has a zippered sleeve luff which is desirable for reducing drag. The sleeve is cutaway for the first reef. This allows the first reef to be put in in a matter of seconds by lowering the halyard to a predetermined spot and pulling in the single reefing line. The second reef will require unzipping the luff to the new tack position, lowering the sail with the halyard and pulling in the second reefing line.  

The portage cart is made of a 2" aluminum tube with stub axles. The wheels are 16" utility wheels from northern tool. The cradles are homemade and bolt to the aluminum tube.

The folding bicycle is a Vilano Urnaba single speed coaster hub it was a great deal found on amazon. Total weight is 21 lbs. The stock bike came with 20" wheels. I replaced them with 16" wheels by Avenir. Front and Rear. The smaller wheels lowered the pedals to within about an inch and a half to the ground but the bike is still easily ride-able and I can't make sharp turns with the boat in tow anyway. I also purchased some larger sprockets to replace the 16 tooth one that came stock. A 22 tooth sprocket was still too high of a gear (this is the configuration in the video above). A local bike shop did a great job installing a new 44 tooth crank in the front to replace the 57 tooth that it came with. Now the gearing is nice and low. About 6mph at a cadence of about 80 to 90 rpm.

1 comment:

Wade Tarzia said...

A practical change of plans for the ama configuration.

What are the dimensions of your aluminum cross-beam tubes, i.e., diameter and wall thickness? I am always curious about what is strong enough but as light as possible for such sailing craft (as I am building a new light-ish outrigger canoe myself and will soon be facing such problems -- aluminum tubes or mast sections from Dwyer (etc.) would be a welcome savings of time vs. constructing wooden box-beams.

Meade Gougeon seems to have used a carbon cross-beam? I wonder if it was just a standard windsurfer mast?

Good luck as you test the boat! Looking forward to your UFC run!