Finally I'm getting down to the "short hairs" of my flyer build. I was checking the rake on the mast helper and want to make sure I understand the measuring method correctly.
Its supposed to be raked ahead 3.5 inches per vertical foot.
--> Is vertical measurement taken from the base of the mast helper or the base of the mast mount?
--> is that with the mast base set at 4 inches from "IFC-TG"??
The temp is dropping here and its tried to snow twice already so I'm hoping it won't be long before I can go for a test spin..!!
Thanks
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Hopefully I read the question correctly.. but the mast rake is set with the mast only and the measurments "horizontal distance per vertical distance" were all measured on the mast itself. Hopefully the mast is fairly straight so you can really do this measurement anywhere on the mast.
What you are ultimately trying to do is match up the sail center of effort with the boats center of gravity. The boats center of gravity is probably just a little behind your tail bone and you want the sail center of effort to be about 1 to 1.5 feet behind this. With a boat this small, its somewhat of a trick to get the sail center of effort far enough forward but I think whatever was given in the plans results in fairly good balance with a slight (desirable) weather helm. Even though the mast is raked fairly far forward, when the sail is rigged on the mast, it will bend the top back and you get the curvature of the mast extending over your head somewhat but the top of the sail still raking back. The rigged sail is still raked forward but the entire sail area is behind the control rotational axis so it ends up being stable.
wh
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Thanks for the great explination, now the photo in the plans makes sense.
The closer I get to finishing this boat the more I appreciate all the hard work and hours the designers must have put into it.
I have had to substitute 3/4 birch plywood for the sitka spruce, I'm anxous to see if it will be stiff enough or if I will have to add any gussets or extra braces.
Thanks again for your help
Dave
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