Boat Plans Butler | Curved mast tuning a mainsail

Boat Plans Butler

From: Philgeren@aol.com
Sender: Star45@yahoogroups.com
Date: Wed, 22 Nov 2006 06:58:53 EST
Subject: Re: [Star45] Curved mast -- advantage ??


Curving a mast so that it bends convex forward (concave aft) moves the luff edge of the sail forward and reduces the camber of the sail in the section where the mast is bent (if bent half way up the mast, the camber in the up/down center of the luff of the sail is reduced). In a blow, this reduces power, reduces leeway force, reduces weather helm, allows the boat to increase its speed.

Generally, the minimum position of mast bend is considered to be a curve equal to the luff curve designed into the luff edge of the mainsail. For very light air and for heavy air, maximum mast bend is used for maximum speed. For very light air, less camber makes it easier for air to stay attached to the leeward surface of the mainsail as the air passes aft. For medium air and for waves, where maximum power equates to maximum speed, minimum mast bend is used to get maximum designed camber.


By use of all the tuning controls on a mainsail, one can obtain a certain amount of control over the distribution of camber over the length of the mast, and there will be an optimum camber distribution for any particular sail and set of wind conditions. Pretty complicated to get it perfect, however outstanding sailors like Stuart Walker are on record as saying it is of paramount importance to use this against competitors who are using it. Otherwise, in a one-design competition they win.
My two cents.

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Boat Plans Pdf | Stand for tuning finished model

Boat Plans Pdf

John Fisher sent these in. It might spark some thought for other people as well. He does not claim to have come up with this design, You can use any materials that you have handy, He has a mill and a welder, so his ended up in aluminum. these stands have been built from PVC and Copper pipe as well.

The stand has a vertical tube that is the pivot for direction. This way the boat can feather into the wind. If the ground is soft enough where you sail it can be pushed into the ground. Works fine in so-cal but not very well in colorado. Next there is a H shaped part that holds the boat. His are machined and welded aluminum, but he has seen this part done with copper water pipe or PVC pipe. He added the foam for insulating water pipes to prevent the boat from being scratched. The H should be able to rotate. This allows the boat to heel in the stand when force is applied to the sails. Connect the two and you have your stand. On his stand the connector is a pcs of 1/2" diameter SS tubing bent 90 deg. It provides both motions needed.



The boat shown is a hard chine 10R Class called the Diamond.


John Fisher has cutting files available for hard chine model 10R Class as well.
They go fast :-). Johns 10R Class carries 1500 sq in of sail, is 65"
long and only 9" wide.

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