Decksweeper F18 Rig, introduction and first look on the C2

Here we’re having a look at this great looking new sail,. Here’s an explanation from Greg Goodall of Goodall Design:

“The tack and bottom part of the prototype sail worked really well. The other good outcome was that the fittings at the base of the mast (halyard pulley and Cunningham tang / pulley ) can remain as they are.”

“The sail looks a bit flatter due to the sail being narrower in the top but we have made the % depth greater. What this means is that we get more lift and less drag, which is the usual outcome from higher aspect ratio wing sections.”

Greg continues “The additional depth that can be built into the bottom of the sail must also be a bonus. Normally the bottom of the sail is kept flat to reduce the drag at the foot of the sail. The flat foot also means that there is not much lift, i.e. the lift to drag ratio at the bottom of the sail is really bad. The deck sweeper solves a lot of this problem by creating an endplate effect which reduces the drag and the greater depth results in a significantly better lift to drag ratio in the bottom of the sail.”

Thanks for watching.

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