Center boad location

[frank smith]

I have seen a lot of boats with the center boat pushed up front .mostly junks, and dories . How far forward can the board be pushed to get it out of the middle of the cabin?

[PAR]

As far forward as the sail plan and remaining lateral area will permit, there's no specific percentage or amount. Each design is unique and address these issues independently. A second, trimming board can permit the main board to be well forward.

[hoytedow]

I may be wrong, and tell me if I am, but isn't the center board usually placed directly under the center of the sail area?

[bistros]

Originally Posted by hoytedow

I may be wrong, and tell me if I am, but isn't the center board usually placed directly under the center of the sail area?

You have to look at the boat as a whole, and balance lateral resistance with center of effort. Rudders and the hull count as well as the centerboard. Using only the centerboard under the COE would probably result in lee helm.

--
Bill

[frank smith]

Originally Posted by PAR

As far forward as the sail plan and remaining lateral area will permit, there's no specific percentage or amount. Each design is unique and address these issues independently. A second, trimming board can permit the main board to be well forward.

I know this is a complext issue , and that the rudder become a greater
contributor to the lateral plane . I have heard of sharpies using two boards ,
but not with great success . It may be the chine inter action that causes
some of the problem . Here is an example of a board forward .
there is also a resent Bolger design St Valery that I find interesting .

[PAR]

This is a fair bit more complicated then this venue permits covering, but the BeachComber dory carries a good portion of it's immersed area forward, particularly compared to more modern craft, so it appears that the board is too far "north". This coupled with the "live ballast" trim that is possible in a lightly loaded dory and a CE that will move well outboard and forward as the sheets are eased, means you can toss the rudder in the drink and trim or steer the boat with crew movement.

[frank smith]

I see what you mean about the fullness of the bow in the dory .
I guess like any thing in boat design , there are no easy answers .
thanks