[PCW] asymmetric boards

[Bob Kupps]

OOPS sorry about that...
   
  Looking at the asymmetric centerboards on the Dynarig motorsailer got me thinking about the daggerboards on my 50' alloy motorsailer cat under construction. It uses symmetrical NACA 0020 foils but I wonder what the improvement in L/D would be going to a classic flat bottom foil like the Clark Y? Not a good set up for single handed short tacking but it might be worth considering in a motor sailing cruising context. With a performance multihull whenever the winds are light enough to justify motor assisted sailing (or looking at it the other way around, whenever useful assisting winds come up while you are motoring) the apparent wind will always come from ahead of the beam and in most cases maximum motor sailing performance will be reached at the rig's pointing limit. So it seems to me that both the airfoil and hydrofoil of a motorsailer should be optimised (to the extent consistent with the other design goals) for upwind work. Anyway, as far as the hydrofoil, is there any
 informed opinion or links out there re the improvement available with asymmetric foils?

 
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