Thursday, April 5, 2018

Playing with different rig layouts

I've been meaning to get the boat accurate drawn in Cad for quite a while to play with sail types and dimensions.  Good way to get the CE close to the right place before actually building and putting it on the boat.


 The sail above is pretty much the one I've already built.  The geometry gibes with what I've found on the water.  I end up pulling the sail back for the right helm balance when going to windward.  I also drew in a sprit boom with the snotter about as high as I can comfortably reach, and it lays out pretty nice.  Since drawing this I've run both the running parrel and the downhaul into the cabin for easy adjustment on the fly with the hatches installed.  anytime I'm headed downwind, I'll want to move the sail back forward as it's shown on the right.
I've also been wanting to do a junk sail for the easy reefing.  I built one for a little trimaran I used to own, and it worked out great.  This is a sail built on the Vincent Reddish classic proportions using 10ft battens.  The area and balance end up almost perfect for my existing mast location.  This one will get built when I find the right batten material.

4 comments:

  1. Got Robbsboat plans myself.... and have built a Reddish sail out of polytarp in the past. I'd far rather have the junk sail myself and have sailed two junk rigged cruisers. The reefing alone will work out well. Thanks for working out the dimensions. Great article on Duckworks re poly junk sail with mods that make it go well to windward. As I recall 10' battens on one of the 2 sails he supplies dimensions for in the article. Curious if you think a small mizzen is worth it. One junk rig I had the mainsails sheet runs landed along the mizzenmast and worked well. Glad someone already blazed a RobbsBoat build path.

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    1. Robert,

      I find I can dial the helm pretty well with the Barrel/downhaul arrangement to move the CE on the main. The time I really want the mizzen is when hoisting in significant breezes. The mizzen would really help keep my bow into the wind for that part.

      Tom

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  2. Like Robert, I also appreciate your blazing a Robbsboat build path. On a relatively narrow boat like this, quick and easy reefing seems like a great modification, so I'll be interested in hearing how the junk rig works out. Should be good.
    We're back in Oregon for the summer (Corvallis). If there's sometime when you're taking the boat out and would be willing to let me come along for a short sail, I'd love to see how she does on the water before beginning a build.

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    1. David,

      Happy to take you for a sail. Too bad you missed the Coot's mess about at Fern ridge a couple of weeks ago. Actually you didn't miss out really, there was almost no wind that day. If you'd like to catch one of the many small boat gatherings around, you should follow the Coot's messabout calendar. I'll be at the Hagg Lake one on July 8th.

      http://www.coots.org/index.html

      After the river levels fall a bit, I'll be out on the Willamette and Columbia fairly often if you'd like to make the drive up. Usually pretty dependable wind there.

      Tom

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