I'm puzzled.... why do you want a daggerboard/centerboard on your early planing board?
Wide boards (85 cm -101 cm wide) and larger sails (8.5m-10.0m free race sails with plenty of
draft depth to give maximum light wind (< 10 knots) power are the only boards that truly "plane"
in < 12 knots of wind.
What can you do with a centerboard/daggerboard that you cannot do on a wide short board?
If the winds are < 7 knots, yes, a longbooard or a wider transitional board will be faster, point higher
(if you do extreme things like railing, moving the mast foot fully forward, etc.) and might be a little easier to sail.
Below 7 knots, you are just cruising.....regardless of the type/width of the board and sail size.
You can take this to the extreme and get a Serenity with a 7.5-8.5 m2 sail and go by virtually everyone
in < 7 knots.
But in the 8-12 knot range, with an 8.5 m2 rig (larger 8.5-10.0 for heavier sailors >90 Kg.) a wide 90-101 cm formula or wide slalom board is the only board that will truly plane.
By railing the wide board, you can still get back upwind (albeit a little more slowly) than a longboard/transitional board with a centerboard/daggerboard.
Some of the new wider transitonal boards like the Rio M almost fill this gap (8-12 knots planing) but they are not wide or light enough to "pop loose onto a plane" with a couple of pumps like the very wide short planing flat formula and wide slalom boards.
About the best board for these conditons is the Ultrasonic 147 with a large (=> 8.5 m2) rig.
Hope this helps,
P.S. Your girlfriend will love sailing a wider board (she will fall off a whole lot less often) and she can be taught
to tip the upwind rail down to go upwind very easily.
Standing slightly off center to the upwind side will cant the board so that it sails upwind on the rocker shaped into the bottom of the board.
It's not intuitive, specially for sailors who have learned on a narrow tippy board, but on the wider board it's very easy to show them and explain how it works. Once they know this, they are pretty much "done with daggerboards"forever.
Last edited by Roger; 10th March 2012 at 12:31 PM.