I am weight 75kg and using the ace 7’6x17” , and having great time
The board volume is depend on your level and condition ,
30L more then your weight is good if you looking for very easy ride , but lack of performance .
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You should be fine at 100 - 110 L
I think he very recently said 1.3 or 1.4 multipliers
I also recall him saying some time ago slightly higher for a displacement style hull and slightly lower for the planing style hull.
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Can anyone compare the North Horizon stability to the KT dragonfly. I’m currently on the 7’7”x20” dragonfly and find it very unstable with the round bottom. Definitely partially due to my skill. Have a North horizon local that I can buy and trying to decide if it would be worth the switch. 7’5 or 7’10 horizon available
For anyone interested, Appletree is dropping a V2 downwind board soon.
Got my copy yesterday: 7’7"x18" 100L, first feels are good! It’s ~1.3lbs lighter than my V1 at the same volume. I’m told they were able to source thicker foam which allowed for more rocker in the shape. Compaired to the V1 the V2 has much earlier rocker tip and tail.
From the first few paddle ups this gets off flat water easier than the previous gen, although my V1 was 7’3"x19.3". I was able to paddle up first try (after a few months off the sup) in a 5/4mm. With the thick suit I weigh ~90kg.
Can’t wait to give her a proper go when my local DW isnt frozen.
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Do you have dimensions for the whole range?
I don’t. This was a custom size, but I think in general all the sizes have gotten a bit narrower. The rails on this are much more boxey than my V1
What was the final weight for the 100 Liter v2 board?
Approx 13.3lbs. (measured with a luggage scale)
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The issue I have with Appletree on DW boards (at least last time I called them) - was they said they couldn’t make anything above 7’7 because they’re limited by blank size 
Fine if you’re a lightweight or want a surfy shape… but I’m a fatass and I like >8ft boards.
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Comparative Analysis of SUP Foil Boards: Production Models vs. Homebuilt
The following table highlights various SUP foil board builds, showcasing their volume, length, width, AR (Aspect Ratio), weight, and corresponding HL Factor (pounds per 100 liters).
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Gold Standard: 10 lbs/100 liters (4.5 kg/100 liters), which is attainable with well-constructed custom boards.
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Helium Grade: 8.5 lbs/100 liters (3.85 kg/100 liters), representing the pinnacle of ultralight construction. Achieving this level demands meticulous design, often using XPS or EPS cores. These boards require careful handling due to their reduced structural reinforcements.
→ The Appletree 7’7” V2 cited came out at 13.3 lbs / 100 liters.
Key Observations:
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I have experienced that having an 11 lbs, 128 liter board (HL = 8.6) is like having a 14 AR foil (maybe even 16 AR I haven’t been on one of those yet). But I can’t compare notes with anyone because no one else is making hyperlight boards.
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To get an ultralight board you either have to go custom, example see Mark Raphorst the Flying Dutchman here: All About Wing Foil Boards – Flying Dutchman, or build one yourself. I am still amazed that you can build a board yourself and it can be 20% to 30% lighter than a production board.
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Bringing back this thread for some advice.
I recently purchased a KT dragonfly crossing after moving on from a barracuda. First off I love the board and the shape! But, the construction…has anyone had any issues with the step hull? Iv used this board maybe 15 times and some cracks started to appear around the tracks. I don’t think I have abused it any more then I have my other downwind boards or prone boards. In fact iv taken care of this board the most. I have heard that KT boards are fragile but I’d be surprised if they are really this fragile. I guess what I’m asking is should I push forward with a warranty claim? Or is this expected with KT boards. Would love to hear from previous KT owners. I really don’t want to trash KT as a brand I think they are great and make amazing boards in all disciplines just want to know if what happened is my fault or a factory defect
Thanks!
Those look like they are raised, and thus maybe caused by internal stress, like a fracture from pumping leverage or something. They don’t look dinged in, as you’d expect if the board were hit or otherwise damaged by an external force.
Almost looks like tears in the carbon weave. What do they feel like? Are they indented or more pressed outward?
They definitely are not pushed in you are correct. I haven’t hit anything while foiling the only think I could think of would be Iv touched the bottom a few times paddling out on my stomach but it was light taps then I would get off and walk to deeper water. Id be shocked if that was enough pressure on the board to do that.
Any chance a tie down strap was across it there? I’ve seen similar damage that way
Is there a rhyme or reason to the location of the dings? Can you post a full board shot with the dings marked out?
I had similar cracks from the rope I use it to tie down to my roof rack. If you don’t strap your board to a roof rack then it might be something else.
This looks surprising to me, I have a Dragonfly v1 as my main board and it’s been rock solid and beyond my expectations for such a light board. I don’t strap it, I transport it in a surfboard sock and slide it into my car over the seats above where the removed headrests would be.
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The only thing in common I can see is that they are all on the hull line of the step hull. Maybe a weak point? I have since put quick epoxy over for a temporary fix but the grey marks are where the cracks are. I haven’t strapped this board down with straps yet. I’m trying to upload another photo but it’s not working
