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Messages - SURFFOILS
Short paddle, short board, straps, confidence.
Doesn't need to hop on takeoff because he knows the waveface AOA will do it for him.
0.40 is killer. not afraid to hit the re-entry but almost suffers the fatal stall.
1.53 for the difference between hull and foil.
He gets another .5 for the Ned Kelly beard.
And a full Style point for the double knee shimmy at 2.58.
Bill, For sure the DW will be different and I haven't done that but from what Ive seen if a lateral foil works then a long foil will too. The only exception would be very low speed, low power waves. Lateral foils have the advantage in low lift.
Beansho, I'd love to have a catalog of HD pics and videos but I only got a few pics for fun and that's not me riding. I had to ask a friend to ride while I took pics and this was his first wave of the foils.
Believe it or not I have a GoPro, somewhere.
Question - "I've read some papers on the high drag associated with surface piercing foils, but haven't experienced the kind of drag mentioned--any thoughts on that?
Do you foil the leading edge of your designs symmetrically?"
With the lateral foils you're out on the shoulder looking for the fine line of speed, balance and lift. When you come back closer to the breaking wave, the most critical aspect is trying to off wash of all the lift and power that's under you. Closer to the break the water moves up the wave, the LIFT is massive, there's no shortage of lift, the inside foil in the tube pic above is 60 square inches and they are SP (surface piercing) foils.
With a surfboard you're skimming on the surface, with a foil you're trapped inside the rising wave trying to drop not lift.
Yes I foil the LE symmetrically becuase it splits the amount of water deflection.
Question-". How to size it, how to determine the best arrangement of the foil under the board. Have you used any of these designs in a board for standing? "
Can you explain more about what you need for sizing and arrangement ? Do you mean individually or as a set ?
Even though I started riding foils prone, I moved to DK ( dropknee) and then standard shortboard surfing foils. Any foil will work on a longboard, sup or a pack of Oreos. Which would be interesting to see !
You mustve seen the pic I posted before ? It's the same foil used to shortboard that also is in the prone foiling videos on Vimeo and on several tow boards.
You know I don't use lateral foils anymore but once you change to long foils you'll stay with them. I had never seen long foils before, even if you Google longitudinal foils there's no precedence prior to mine in 2004.
Question-" I don't know how to calculate lift for a flat foil and how to determine and build in the right AOA."
Bill, I'm sure you've seen the lift equation lurking on various sites, but the best way is to test various sizes. The same area in different shapes gives different lift, including anhedral/dihedral and in my case where Ive split the planing area into different sections and that's totally different again. My advice, don't get caught up in the numbers. There's no substitute for getting wet.
AOA should be parrallel to the hull. When your hulls in the water you don't want the foil to be creating drag by trying to lift. And when you start to paddle into a wave you want the board and the hull working together not fighting to lift at different angles.
Remember as you take off on a wave you don't need to lift the AOA because the angle of the wave goes from flat to angling up so planing will occur naturally. Popping just makes it happen quicker.
Does anyone have any questions about foil design or construction, AOA, lift, profiles,arrangement of foils, riding, chords,leadingedge profiles, concepts, progression, future, submerged Vs surface piercing...?
Whatever you like...
So stoked to know you've built your own and you will be amazed how easy it is to foil with a basic shape.
Even at low speed you're going up in the world !!
You'll be bustin' a move like this up the beach after !!
Maybe wait until you get home...
But it feels like this especially the speed when you're prone, you really are flying.
When foiling on a bodyboard your legs are dragging behind, that gives you plenty of fore / aft stability, it also means you don't need as much area because you're not lifting your entire weight, maybe 60-70%.
Turning it will be easy,it's only a single foil and will pivot around that COG easily, in fact without your feet dragging it will be quite unstable in yaw.
If take the fins for extra kick into the wave and becuase you're new to foiling,if you kick outta some point and kick into the foil you won't be happy. Consider the fins to be safety equipment.
Even at a low speed , that's a foil with big lift.
Despite Supuks cynicism...
Even on waves that don't break you'll still lift up, it's about the area and the speed so you could paddle for knee high ripples and it will work.
For years I used this 2 mm Al flat plate struts up to 4" high and 3mm for up to 8" high just like in the pic below and 3/4" wood screws. Don't even need to foil the struts, just take any edge off.
You don't need 'bulletproof',Go light and cheap and the shorter the struts the less dynamic forces on them.
24 x 12 = 288 square inches, you'll lift very easily, have great lateral stability. maybe a bit too much area for decent waves. Down to 250 on average waves, 200 for OH. Remove from the tips down to 13" wide,its like a bike- speed brings stability.
Keep the supports in the middle of the chord and set itparrallel to the hull, no extra AOA needed, you'll find it's easier to control if the foil and hull are the same angle.
I mount with the TE 2-3" short of the end of the board for safety.
You will have great fore/aft balance becuase you feet will provide stability.
Looking forward to hearing how much you love it.