Concept: Flankboards

[Brian Cady]

Like leeboards or bilgeboards, but:
Unlike leeboards, flankboards would be inboard, leaving a pretty shearline and being protected from dock damage.
Unlike bilgeboards, flankboards would be outside of the turn of the bilge, so slots would not jam on beaching flat-bottomed craft in gravel, etc.

Brian Cady

[Willin']

Interesting idea with merit. Leeboards that don't ruin the appearance of the boat.

You'd be stuck with the task of building two trunks with the attendant possibility of leaks, however. I'd be tempted to stick with one centerboard even if it does clog up the interior.

Have you built these yet?

Mark

[landlocked sailor]

Many of Phil Bolger's designs feature "off-center boards"; their trunks can be hidden in a bunk front or some other structural element. They, apparently, do not have any adverse affect on performance. Rick

[N. Scheuer]

Would they pivot, or lift straight up? I dislike boards that do not pivot, as they jam against the bottom in the shallows. OTOH, a long slot for a pivoting board would require significant stiffening along both sides of the case where it is bolted to the bottom.

Moby Nick

[Brian Cady]

Willin': I've never made any.
Moby Nick: Agreed. I imagine these pivoting for ease of grounding, but recognize long trunks require extensive bracing, like a centerboard trunk. If both were used at once by design, perhaps each could be nearly half-sized.

Brian Cady

[Tom Brady]

I have a 14' catboat with an offcenterboard that forms the front of the settee. I have had no problems at all and you would not even know it was there. The hull has a 18"+- wide center hull(Keel?) stepped about 8" up to the rest of the hull and the offcenterboard slides up beside it and then into the slot. It sits on the 18" wide "keel" when the wind and tide conspire to dry out the canal but the board can't jam because it's slot is 8" off the mud. I really like the layout. Tom

[Todd Bradshaw]

Old Town built a fiberglass sailing canoe back in the early '70's which used twin daggerboards in a similar manner with wells built into the sides of the hull. With the high-performance boards combined with 75 sq. ft. of sail area on a 16' canoe, it pretty much earned it's name the "Wahoo". Old Town 1972 catalog photo:
http://www.imagestation.com/picture/sraid150/p933a5e8e618161f3b37415e5e6763f71/f5dfdf16.jpg

[Venchka]

This design comes really close. Perhaps the designer, Gavin Atkin, could move the boards a tad more outboard.

http://www.duckworksmagazine.com/designs/atkin/bluestone/Bluestone_Sailplan_toffee.gif

Wayne
In the Swamp. :D

[Alan D. Hyde]

Almost moveable bilge keels...

Alan

[Bruce Hooke]

That's one HECK OF A PAINT JOB on that Old Town Canoe! :D :D

It does kind of have a 70's look to it...

Looks like fun sailing too!

[Todd Bradshaw]

It's not paint, it's printed cloth or some sort of paper set in as the first layer under clear gelcoat. It does kind of have that "Mod Squad" flavor. They also had one called "Burma Teak" which was printed with fake wood grain. Back about 1972 or '73 I sold Vega canoes and kayaks (later known as Moore Canoe Company) and they would set any lightweight printed coton fabric into kayak decks for a small fee. Customers came up with some "interesting" choices in an effort to out-do each other. All in all it made for some pretty funky-looking boats.

[Hwyl]

I've seen that fabric underlay on a Cape Cod Frosty. I was told it's a surfer idea.

Getting back to the bilgeboards. In an earlier post someone said two 1/2 size bilgeboards would equal one full size centreboard. I don't think this is true, especially in the flankboard config, because the windward one would lose the endplate effect.

Edited to add the quote "If both were used at once by design, perhaps each could be nearly half-sized." Brian Cady

[ 12-20-2004, 09:05 PM: Message edited by: Hwyl ]

[Wild Wassa]

The motifs in the paint job looks like they are transfers or a stencil. The motif is repeated and is too regular to be a bit of abstract expressionist art ... although, if you drink and paint you are an Abstract Expressionist.

They were somewhat uninhibited in the '70 with their gel coats, wow. Melges paint jobs can be just as wild although I think most are after market custom jobs.

Warren.

[ 12-20-2004, 10:27 PM: Message edited by: Wild Wassa ]

[Dave Hadfield]

Twin bilgeboards are used in this boat, a Bolger AS-29:

http://members.fortunecity.com/booraleaboats/AS29.jpg

These are low aspect ratio pivoting boards.

[Dave Hadfield]

Didn't post....

Try this:

http://www.ace.net.au/schooner/LKSAIL1.jpg

[N. Scheuer]

What a cooincidence, Todd, I was just about to post a note about Old Town's Wahoo, myself.

Moby Nick