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Messages - Slyde

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Foil SUP / Re: Another revelation about the Barricuda style Kalama board!
« on: October 18, 2022, 10:56:35 PM »
OK, yes that makes good sense thanks for that. What conclusions have you come to wrt volume? Im guessing theres no point in being too corky. What do you think?

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Foil SUP / Re: Another revelation about the Barricuda style Kalama board!
« on: October 18, 2022, 03:09:26 AM »

OK so that answers my question about whether there is really any need for side bevels on such a narrow board. I bet those slab rails are more stable than the bevelled ones.

It might answer the question about whether they are NECESSARY.  But it doesn't answer the question of whether they are beneficial.  I tend to think they are, but the only way to know would be an A/B test
[/quote]
Science schmience.😉

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Foil SUP / Re: Another revelation about the Barricuda style Kalama board!
« on: October 15, 2022, 10:10:28 AM »
Terrific FF!  Would you post some images of your board?
OK so that answers my question about whether there is really any need for side bevels on such a narrow board. I bet those slab rails are more stable than the bevelled ones.

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Foil SUP / Re: Another revelation about the Barricuda style Kalama board!
« on: September 30, 2022, 12:30:35 PM »
Peter, I'm very impressed with your build. Planning to build one myself. Would a wave piercing bow help the design, and are bevels really necessary on a board only 20 inches wide?

5
Nice board. Is the hole for water drainage, wire routing or both?
drainage. The wire cannot be disconnected. It would be perfect if it had a waterproof plug for the battery box. But i think there might be an issue with the amount of current needed for a waterproof plug, but dont quote me on that.

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and from the bottom...

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I'm building my own foil drives. I'm at V 2.2 right now.

Funny, I was just talking about this at the beach yesterday. We were discussing putting a hole all the way through  the deck and mounting the battery pack longitudinally right above the foil. Heat sink would be exposed on the bottom of the board.  That would make it nice and low profile and mitigate the heat and swing weight issues.

I gave this serious consideration when I built mine. But you need a 65mm hole and then each time you disassemble the setup you have to remove the motor from the mast. Not so practical. So I have built a carbon recess with a small self draining hole. The wire will still be exteriorised for practicality. The board has enough volume it will not end up underwater

8
I'm building my own foil drives. I'm at V 2.2 right now. I just blew my most recent folding prop into shrapnel--I need to start armoring up before I test these things--I had a chunk of the prop hit me square in the breastbone. It left a small cut and a big-ass bruise but didn't wind up stuck in my chest so I got that going for me. Time to get the props printed at shops that can do more exotic stuff, though my latest modification to my Ender printers pushes deep into exotic extruded plastic.
Thats above my pay grade.
Ill stick to carbon , foam and epoxy.  ;)

9
Interesting observation Slyde, do you use footstraps? I can see how that reduced tail volume would demand that you be standing a bit forward when you're floating, and if you can't shuffle back a bit you'll be nose down. You could tune the foil position to flatten the trim, or perhaps experiment with your foil or stabilizer angles, but everything is a compromise since we don't have any active trim capability other than body weight position relative to the foil. The Kalama tail is designed first and foremost to move through the water easily. The really long versions made that goal clear--they comprised foiling agility greatly in favor of gaining speed quickly in a wave.
Well actually this SUP will be for a foil drive so I  won’t be using straps for that at least to begin with as there is quite a lot of weight movement required as you foil up. I may add a front strap as I get experienced. The design philosophy here is to have a SUP that will foil up with the least effort so that I can ride non breaking swells at my local beach on no wind days. The sandbar disappeared after the council modified some groynes so now there are no breaking waves that can be paddled in to, but the swells are still there begging to be ridden. Hence the foil drive. It seems the Kalama tail will be the best way of getting a board of this size up to foiling speed.  Itching to get it on the water to try.

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Ha ha, looks like I'm not the only one convinced by Kalama's thought processes. This is my new SUP in progress too. No tail rocker and kalama tail for a SUP that needs boardspeed to get on foil. The tradeoff is a nosedown attitude in flight. I still think a wingboard needs some tail rocker for better flight characteristics but If the SUP proves to be what people are saying I will try a rockered kalama tail on my next wing board.

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Well it depends on what you want the board to do and your level of experience. If you are a beginner and riding a relatively big board where you generate board speed to get up on foil you want a board with no tail rocker to help this process. But once up on foil you will find that the board tends to ride nose down and is uncomfortable to ride as there is not enough front foot pressure.
If you are more experienced and riding a smaller board where you pump the wing and foil to get up on foil then you will be much less concerned about the behaviour of the board transitioning off the water and far more concerned with the attitude of the board while flying. You will want some tail rocker to have the nose of the board ride a bit higher to balance your feet out to get enough front foot pressure. This is more accentuated as you begin to ride faster and faster and generate more and more lift from your foil. In that scenario you need the nose up a little to  get a nice balanced foot pressure. We learnt this lesson on kitefoil boards a while back. Have a look at the rocker on a kitefoil raceboard. Its quite a banana, but feels very comfortable to ride at speed. Compare that to a SUP foil board which is generally quite flat rockered and often rides uncomfortably nose-down. I have built a series of boards from the very beginnings of the sport transitioning from 115 to 100 to 85 to 65 to 60  to 58l. I have added progressively more tail rocker as my experience level increased except for the last 2 boards where i settled on the same more pronounced rocker line. Increasing the rocker absolutely did not make any meaningful difference to takeoff once I was past that beginers stage of using board speed to get on foil. And that is irrespective of HA or low aspect wings. Have a look at what Ken Adgate is producing for the  high-level winger in the Bay area and you will see where this is heading. If a board is properly designed it should not need to be shimmed. The same goes for tail wing shims. Its just an excuse for poor design.

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Wingsurfing, Windfoiling, Wingfoiling, Wing SUP / Re: F-One Swing
« on: April 12, 2020, 09:14:49 PM »
On the topic of leashes heres a small but worthwhile leash mod. High quality 100kg stainless steel ball bearing game fishing swivel. I've had these on a couple of months and been checking to see if theres going to be an issue with corrosion. I've purposely not washed them to see what happens. Just a little surface deterioration. Theres definitely a variable quality of stainless between brands so it pays to do your homework. You also need to get a swivel with a large enough solid ring to push your rope loops through. Without question this solves the problem of the twisted wrist leash. If you're gonna do this just make sure to check that the swivel isn't deteriotating at each session. Could be an expensive outcome otherwise!!

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Interesting thread. So given that by increasing the thickness of a board you could build a 5'2" x 26" with either 80 or 100l of volume what is the advantage of less volume? Is there a point at which volume starts to become a hindrance rather than a help?

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Watched it with the sound off. Looked like a toothpaste commercial with all those perfect white teeth ;D

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Wingsurfing, Windfoiling, Wingfoiling, Wing SUP / Re: F-One Swing
« on: September 23, 2019, 10:18:38 PM »
My take after grand total of one session on 4.2 S-wing, 6'6" SUP and Naish 2000 foil. Im 73kg, experienced SUP foiler, Kite foiler and ex windsurfer. Wind was light to begin with less than 10 knots but filled in to maybe 15 knots possibly a little more.
I was up and riding as soon as there was about 12 knots of wind. Could foil both directions switch and regular as far as I wanted. Didnt quite get any foiling transitions. Rode for 2-3 hours. It was a good workout. My triceps were sore the next day. My mate was on a 5m S-Wing in the same wind. He is 10kg heavier than me.. Obviously with experience the top and bottom windrange will increase but I doubt I would want to ride the 4.2 above 20 knots and I bet at 18knots it would be uncomfortable so I reckon comfortable windrange for 4.2 is 12-18 knots. Pretty sure I was able to ride it down to 10 knots at times pumping the foil. My buddy maybe had slightly better low end but not by much because the reality is there were puffs coming through and the puffs were enough for both of us to foil but the lulls were not enough for either of us. I very much doubt the 5m would be comfortable in 20 knots. I would add that after 35 years of windsports I try to be realistic about the true windstrength. Most guys overcall it by 5 knots or more. Im pretty happy with the decison to start with a 4.2 as this will cover the comfortable learning range of 10-20 knots, but I will get a 2.8 for the 25 knot downwind swell stuff that seems so appealing for wind winging.
I also realised that unless you are foiling you will drift downwind pretty fast so I spent my whole session trying to ride back upwind. Whoever said these things point like a kitefoil is way off the mark. Not even close in upwind performance. I made it upwind just fine but had to work for it. A harness will prove useful for upwind beats where the arms feel it more than on a reach.
Gotta say the whole experience reminded my of windsurfing in the 80s when harnesses were outlawed for the olympics. We had our booms high on similar angle to a wing and went about the same speed.
I had alot of fun but as usual the companies talk up the windrange of their product.
Hope this helps those making decisions about wing sizes.

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