Spawn of Frankenscot: Foiling!
So there are presently two foils extending from the sides of the boat. They resemble the tipped wings of some airplanes.
To put them in, the fellas first cut a pair of holes in the sides of the boat and then fitted them with daggerboard trunks from an A-Cat.
Why yes, it does seem ironic to cut holes into the hull of a boat that was a good floater. But progress is not made without some revolutionary thinking.
When the team chooses not to use the foils, they can seal off these slots with a strip of tape. Good old duct tape would do, though they are more likely to use Insignia sail tape.
A few test-runs (thanks to guest test-pilots Bill Wingrove, John Paulson, Ben Givens, and Dave Clement) to adjust the angle of attack, and poof! The bow lifts to reduce wetted surface and make Spawn a more stable creature.
The team will take to the water this coming weekend for a longish trial. Crossing fingers for good sailing weather.
11/15/2016 12:39:08 pm
Amy: Request permission to use this in the DIYC LOG!
11/21/2016 05:12:40 pm
11/15/2016 12:45:00 pm
Neat! Jeff could apply this to the Mousetrap except that Classic Moths are limited to one center board and one rudder.
11/15/2016 12:59:41 pm
George...I don't think CMBA rules specify that the daggerboard has to be installed vertically...
11/15/2016 01:28:07 pm
Rod: Didn't say that Moths must have a vertical blade. But unlike the twin dagger boards and twin rudders which appear to be features on the Spawn's current iteration, Classic Moth Boats are limited to one of each of those blades, so unless one went the same route as the IMCA foiler Moths (i.e. T-foils at the base of each centrally located blade) I don't see how one could achieve controllable lift with an asymmetrical system. Maybe I'm missing something here. Perhaps on a Moth if one has a wide enough transom, the rudder could be off set to one side while the dagger board could be located on the opposite side. Assuming the rudder could produce the same amount of lift as the foil on the dagger board, then maybe it would work--at least in a straight line.
11/15/2016 01:14:48 pm
No rules boat design makes it the most fun for a deal like this. The boat really feels different than what you might expect.
11/21/2016 05:12:09 pm
Thanks for that insight, Hootie!
11/15/2016 02:43:21 pm
Is it too much delve into proprietary data to ask what the speed delta was w foils v covered slots in approx same conditions ?
11/21/2016 05:10:00 pm
You can ask, but I don't actually know. More testing would be required...
11/15/2016 10:33:12 pm
WOW! being able to fly across Fla Bay. the overall record may fall. As for the Classic Moth how about a ladder foil that mounts in the centerboard trunk?
11/21/2016 05:11:34 pm
8/28/2020 12:50:16 pm
There was a posting about foils in the Watertribe FB page today and I was wanting to get permission to post a link to this page.
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