Gybing Plates

You could cobble together a simple gybing board, your blade is to loose in slot, measure gap, cut 2 strips half the thickness of gap and attach to head of board (vertically), board will pivot round this point, probably not much, but it may give an indication.

Thanks for that Strangler it underlines most of what I already knew coupled to everything else terminology wise I've picked up on this thread.

Lots of explanations always fall into the trap of assuming water 'flow' where there is actually none, time and again it used to come out in windsurfing where they all wax poetical about this and that fin design when the truth is unless there is tidal flow, mostly the water is static an we are passing through it, so the element of what we call apparent wind which is created by true wind and created wind as we all learned in sailboat 101 or whatever it was called in dinghy sail school (I'm thinking of rewriting it in terms easier to comprehend). Anyway that element in the other fluid, the water, is not served up in quite the same manner.

But, the way things function is still the same, and there is an 'apparent waterflow'. So just the same as we can have full sails and flat sections and alter their AoA (angle of attack) my feeling is that a gybing board should be used similarly, effectively by angling the board you are making the foil section artificially fuller if you'll pardon the pun, a fuller plate has more lift, but also suffers with more drag, so they get you going, lift heavy weights off the ground in transport planes etc but don't go very fast. Increasing the section until the 'apparent flow' is created to the point that lift from that 3 degrees is sufficient to overcome this thing you call leeway and turn it into what shall we call it 'headway'? (Funny I encountered what I used to refer to leeway yesterday when coming out of a windy tack close to an island and not getting the flow attached quick enough I began to slip sideways which is what I call leeway)

So what I think is required from a gybing plate is that it be variable and controllable, more so than the simple diamond that is commonly employed, had this been mountain biking we'd have push button controls by now like those employed in the uppy downy seat posts and adjustable suspension units, but it's not this is still 1960's England and the black arts of mystery are employed to keep you all guessing.

Anyway it's all a bit beyond my immediate requirements for my little Minisprint, but I shall endeavour to come up with an adjustable system if nothing else on paper, just to satisfy my own quest for life love and the meaning of everything...

Originally posted by iGRF I need something simpler.

Graeme
If you haven't been to the post office yet to work out leeway, try this dummies guide to gybing boards. Although I do not use the term leeway its illustrated in diagram 5 non-gybing board.

Gybing boards
Please forgive the comic sans, it was written a long time ago.

Edited by Strangler - 31 Jan 16 at 11:42pm

Grf
I think its and Int Canoe.
Boom to low for a Int14 and no carbon tubes for wings out the side, but I cant see the sliding seat either so not 100% sure.
Gordon

Could I guess the black rope there to pull the wedge shaped Vee back to adjust and ultimately lock the board's angle of attack.