Just had my first on foil session with the 4.5M. Hurricane Erin resulted in some gusty winds, ranging from 13 to 38 mph according to the accurate meter on the water within a few yards of riding. It handles the upper end no problem. The lower end, not so much. Session was in a protected area.the kiddie pool.
55L ML with 880 then 1080 foil, 67kgs.
I wish it was a more constant wind so I could get a better sense of what wind power was needed to get on Foil. I did get out my 3.2 Kanaha right afterwards and found it generally easier to get on Foil (although a bit hectic on the high end).
I think there is a pumping technique to be learned where you let the wing fall back in the window slightly and then pull down and simultaneously bring it higher in the window, subtly. When it goes back in the window, it loses power, but as it comes back into the window up high, it really accelerates and has some grunt and you can pull on it pretty good given its inflated structure. Oscillating between the two has some value. It takes some wrist and arm coordination. Time will tell if this is a valid technique.
Up on foil and heading upwind in the stronger winds felt amazing. I felt like I was going into the eye of the wind, going almost perpendicular to the small bumps. This may be a problem in big conditions, as I already feel like an Olympic hurdler with the single skin mashing over bumps at a more obtuse angle. It also really keeps its momentum through the lulls and doesn't require as much babysitting.
The angles did not feel as great riding toeside. The Paia is so stable that I was pretty close to switching stances at one point, despite the gusty conditions, and my lack of skill. (I once dedicated a whole 30 minutes of trying to learn switch stance winging a couple years ago).
It's unfortunate that there is a low end sacrifice to gain the high-end. I can't wait for a few years from now where we can have the best of both worlds as I'm sure it's possible.
Going from the Paia to the Kanaha felt like I switched out from an Aston Martin on a wet track to a Honda Civic with grippy tires. Civic might be lighter and a bit more nimble but the Aston Martin wants to let the horses run once it's moving. I had a 1.6knt higher top speed with the Paia, but the average is probably more substantial.
I tried a bunch of tacks with the Paia and came quite close to staying on foil, but nailed my 2nd attempt with the Kanaha thanks to the grunt (and despite it coming around and putting the wing upside down on the water momentarily).
Here are two snapshots of the angles between the two. To be fair the long tack on the 3.2 Kanaha wasn't during a gust, but the smaller one lower down was.