Riding some clean glass conditions for the first time in ages, I had a great feeing of pumping at what felt like the absolute top of the mast. The acceleration on each pump was amazing, and effortless glide. This must be the key to unlocking efficient links.
However, on the Axis 880 HPS, I found that when I inevitably breached because of
pumping so close to the surface, the ventilation would persist. The recovery was sometimes viable, but then impossible to regain any real rhythm from all the effort. It felt as if the ventilated wing stayed ventilated for at least another pump.
I wonder if this is the next frontier for better foil design.
Almost assuredly a mistake by the cabrinha marketing team. Surfers are not very smart, and the “cavitation” explanation has been going around since foiling started. With Kai Lenny still saying it. Only foil brained people who actually pay attention have switched to saying ventilation.
I think I agree on ART, especially while turning and loading the inside wing, the outer tip popping out is barely noticeable, as long as you have sufficient speed.
However at slow speeds and lower angle I don’t think I’ve ever breached a tip and recovered, while I noticed on the HPS I was able to recover twice, and could feel the ventilation sticking to the wing and then releasing (I think…), granted the HPS is pretty dated and simple relative to the ART, I presume the updated version would address this.
On the Axis PNG yes no problem, but it feels pretty much like a low range truck while pumping, just grinds on. HPS slightly less but for the speed it works. ART is as you describe, unless flying along if the tip breaches then I go down.
Maybe you are thinking of wing fences? Similar. F-one has used them on their tails, but I think would be too fragile for main wing. I’m interested in trying it DIY on the HPS, but I don’t really know how much they are designed to work in conjunction with ailerons on a plane. Also they seem to address a different issue (spanwise flow?). However I’ve seen them pretty often on the mast of offshore sailing foil boats, so they must have some value
On the other general designs being applied, here are some pics, seems that some deflection at the tip is where this leads:
I think beach recovery is ok on most foils now as long as you have power from either a wave or wind wing or kite. Especially if breaching while turning. I’ve never recovered from a flat breach while pumping though. Finding that if I pump too hard while riding high on the mast you can “plunge” the foil where even if you don’t breach, pushing down too fast and sucking air down to the wing? Anyone else feeling that? I guess the solution is to glide a bit longer or angle down a bit more before initiating a pump?
I agree - I think most newer foils handle tip breaches as long as you have speed and you’re in a turn. Breaching when pumping is a different thing as the wing is more or less parallel to the water surface so you’re getting a full ventilation - if that happens to me I pretty much always fall no matter what foil I’m on.