Wide Gap Strip Plank - what problems could this building method cause?

[rwatson]

rfnk - I stuck the full details at
rough draft of 28ft trailer/sailer/power cruiser with water ballast

- its a redesigned 26ft Mac26 (eg www.macgregor26.com )

I am currently waiting on the mould designs from the NA, to build a scale model. That would be a good time to do the test panels I guess

[rfnk]

Very nice, techy boat! I like the twin daggerboards and other measures to clear out the interior - maximum living space for little, if any, loss of performance. The daggerboards remind me of the tri-fin surfboard (thruster) setup. Tri-fin surfboards didn't work at all well until, as far as I know, Simon Anderson set the outside fins so that their line meets a point slightly behind the nose, aimed at the opposing rail. In other words, the outside fins are not set parallel nor are they aimed at the most forward point. This seems counterintuitive to me, you'd think it would create drag going forwards,but it certainly works for surfboards. The application is very different, of course, but are the daggerboards on your boat in line or orientated differently? Ignore the question if it's obvious on your 3D drawings - I haven't had a chance to download them yet! Rick

[rwatson]

As it turns out, I just got an email from the NA today about this. He has hinted at "secret mens business" methods of setting up the twin fins. He has done a few for canting keel monsters, and so has a bit of an insight (one would think) into the concept.

I had always envisaged a "toe-in" effect, and had a few discussions on the logic in previous postings in this site. I was even going to try for variable geometry on the fins, but that might have to come in version two.

At least I wont have the problem of snapping the fins at 30+ knot speeds :-)