?list=PLmHjmI8ExtaG5p8qI80bjYMBmC7WRYXWz

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VCRWoody said..

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That looks a bit iffy. Creating a point load and sanding your fuselage insert? What about just adjusting the rear wing ... most manufacturers do so and if not shimming a small wing in the back would seem much easier and less prone to catastrophic results ..

That Delta video talks about shimming the FRONT wing to effectively move the center of lift fore or aft, in order to balance foot pressure. Watch it carefully all the way through to see what he is saying.

Shimming the stab to change the down angle is another kettle of fish altogether.

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segler said..
That Delta video talks about shimming the FRONT wing to effectively move the center of lift fore or aft, in order to balance foot pressure. Watch it carefully all the way through to see what he is saying.

Shimming the stab to change the down angle is another kettle of fish altogether.

He is not shimming the front wing. He is shimming the insert of the mast into the fuselage, see 4' and following, thus introducing a point load. And then he tells you to sand the insert, 6' and following. Either idea seems iffy to me ... but what do I know.

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segler said..
That Delta video talks about shimming the FRONT wing to effectively move the center of lift fore or aft, in order to balance foot pressure. Watch it carefully all the way through to see what he is saying.

Shimming the stab to change the down angle is another kettle of fish altogether.

No its not, its about shimming the fuselage. In my opinion the guy in the video is genious, but his explanation is missing something.

Shimming the fuselage instead of the mast is brilliant. This is effectively the same as changing mastrake, although with mastrake you change the position of the wings fore-aft by about 3cm per degree aswell. Shimming the fuselage like so allows you to trim the noseheight of your board effectively without changing the wing position relative to the straps at all.

Thats why I wouldnt use this method to trim your power fore aft much. The nose of windfoilboards are too long and the rocker radius of our boards is too small for just adjusting the angle of the fuselage, especially if you occasionally touch the water! Riding fuselage nose up/board nose down as in his example kills gliding through when you accidentally touch the water and leads to catapults.

Both shimming the mast (so raking your mast) and the fuselage would move balance without changing angle of attack (mast +1 degree in the board and -1 degree in the fuse and the fuse is at 0 degrees again but shifted back 3cm, -1/+1 its 3cm forward). This would be a very viable option, but then you could also just move your straps or ride your foilmast back/forth in the tracks or angle the stab etc.etc.etc.

I like the idea of trimming the fuselage angle of attack independently from the mast to adjust noseheight in fleight, but my race mast-fuselage is onepiece (fixed), and my freeride setup is perfect as it is hahahah.

I stand corrected. Yes, he is shimming the fuse to strut connection. If you don't change the front wing connection to the fuse, this effectively tunes the front wing angle to the strut as well. Like you guys, I don't like this method to tune the fore-aft center of lift against the feet. It weakens a very high load point between the fuse and strut. There are better ways, such as tracks and movable footstraps.

However, make sure not to confuse this with shimming the stabilizer to tune the down angle. Stab shimming tunes the front wing's angle of attack, nothing more. The first video in the "Wing Fundamentals" thread discusses this when he talks about the tail.

Interesting comment about rake

"It is always interesting to be able to adjust the rake according to the board, the conditions and the type of course. Alex Cousin and the Goyards do not use the same rake in slalom and upwind / downwind. Nico uses less than 2.5 ? in upwind / downwind and Alex Cousin uses up to 3.5 ? in slalom in the breeze." - Alex Udin of Phantom
Translation by Google. Sauce: www.windsurfing33.com/forum/viewtopic.php?f=42&t=120891&p=863869#p863869

Those numbers dont mean much without knowing where they measured and even if you knew where they measured it would only be viable for the phantom, the comment is intersting nonetheless.

I'm at 1.4 now, but used to ride 1.9 which I think I prefer, but I lost my shim hahaha. If I find my other shim back i'll try to combine them to get 2.3 and see what that does, might be nice in rougher conditions. My fuselage is fixed at 91degrees to the mast (Lok? PWA Race 105), so you could see it as +.4 and +.9 aswell.. I pretty much only do courseracing, but increasing to higher values for slalom seems logical. Might be that the slalom (95) mast has a different angle between the fuse and the mast already though!