Brent Swain

[crewman]

There is a 30ft in the local marine with twin lifting dagger boards. At least they are out of the centre of accomodation. Might be a one off and in ply. Tackles look light, so not heavy boards, likely internal ballast.

The original Red Fox had twin dagger boards and apparently sailed well. Only 20 ft long mind.

 

[Laminar Flow]

I suppose a case for twin centre boards could be made if each were toed in, say at 3-5 degr, and only ever the lee side one is used at a time. The argument being that there would be less resistance from a single centre board being in aspect, rather than the an entire hull as is the case with a centre keel.

Conversely, they could also be given an asymmetric profile, much as the Vendees use, and, given enough speed, cancel out leeway entirely. The problem with that is that a profiled form has near enough twice the drag resistance as a symmetrical form. This could be compensated for by using a smaller board to take advantage of the higher lift generated by the asymmetric shape, however it could also be somewhat embarrassing when maneuvering in tight spaces and at slow speeds in anything of a crosswind.

 

[Mister E]

All this is so far away from swains welding.

 

[Laminar Flow]

All this is so far away from swains welding.

Actually, only an hour and a half, not counting the ferry, to visit the master himself, 15min to the next example of his design prowess.

 

[Mister E]

Let us know.

 

[Laminar Flow]

Let us know.

Thanks, been there, done that. Not much to see.