Wing size based on rider weight

I am wondering what the effect of a bigger wing like the infinty 99 or moses 1100 does for smaller vs bigger riders in light wind.

I am freeriding and like to use as small a sail as possible. 8-12kts on a 6.0 and infinity 76 front wing, 65kgs. I think the stall speed is like 7/8kts for the i76. I have seen foilers 90kgs plus foiling in light winds on the i99 or 1100 front wings with huge success.
Interested to hear what benefits light guys like me get from the super large front wings( i99 or 1100)
My goal would be to either be able to use a smaller sail in the same wind or get foiling in even lighter winds

I'm not racing or into hitting high speeds, just want to cruise around on a small board(wizard 105) in light winds with slow arcing turns or ride down a few small waves. Don't mind pumping around with very little sail power for a few hundred feet. From what I find the i76 is not the best wing to pump but sorta works, that's probably the only thing it doesn't do super well.

8 kts of wind for any size sail is wishful thinking unless you are a pro formula racer on a 12.5 who can pump their lights out all the way around a course. There is not enough kinetic energy in 8 kts of wind to make anything happen in our sport, including windfoiling.

10-12 kts begins to work well if you are light enough in weight, have a big enough sail, and a big enough wing. Windfoilers in Seattle use the i84 and i99 with 8.5 and bigger sails in these light winds.

At 93 kg, my low-wind minimum threshold is 12 kts with a i76 and a 7.0 sail. This is a realistic minimum for most of us freeride amateurs.

Don't be looking to get much riding in less than 10-12 kts. Some people do, but for most of us, we will just be disappointed. I don't even rig up until I can see at least an occasional whitecap.

Yes, windfoiling is billed as a light wind alternative to windsurf slogging. That's fine, but you still need enough wind to get you and your gear moving at enough speed to plane the board and fly the wing. 8 kts won't do it.

Listen to Segler.
At 73 kgs., a Naish 122 with 1220 wing and 5.2 gets me up and going in 12 knot gusts with pumping.
Nobody else is going except for racers with 8 meters or wingers pumping hard with 5's.
I just switched to a 600 kitewing....about the same with maybe a few more pumps to build a bit more speed.
Still need 12 knots.
Guys smaller than me on bigger slalom boards get going in the same breeze using 7.5 meter sails and hard pumping.

I'd guess that there is a linear relation between wing size and body weight, but a square relation to wind speed. In other words, bigger guys can benefit quite a bit from larger wings (for freeriding), but the payoff for light weights is more limited.

It's a bit different for race foils and large sails, where pumping generates the speed and apparent wind needed to get going at the low end. Winging is also a bit different because it can be done at a lower speed, since the wing supports some of the body weight, instead of a rig adding weight. So larger foils with lower stall speeds can make more sense even for lighter people when winging.

That's all just guessing, though. It would be interesting to hear from light weights who have tried bigger front wings.

Bigger wings help the lift. lighter riders will be able to get up earlier. Larger sails help with power. Larger boards allow you plane a little earlier as well. All said, I'm in search for the lightest air foiling here at 6000ft. I have a SB 1100 front wing with the long fuse and can usually get lift off with a small gust and some pumping with 11mph winds. Similarly, I tried one of the larger slingshot wings on a SS board in the same wind and have had issues lifting off (due to the board friction through water).

So question is: If all we care about is getting up in fly mode on the foil, how big should the foil wing surface/wingspan be before adding additional size will not increase the lift further?

Aka with the Infinity, we have gone from 76, to 84, now to 91.
Will next be a 101cm wing? Or why not aka a 120cm?
When does the additional drag and weight add more negatives than positives, when increasing the wing size, if all we care about is the lift power?

I am also surprised why surf mags have not long ago setup the test benches to crunch out these numbers?
Put aka the infinity foils into the bench, then set the water speed at 15 knots. Then measure the upwards lift power each size produce. and afterwards across the different brands.

And while you are at it, measure the resistance they cause at the same time. (Essentially a measure, which converst into the power you need to compensate for when holding your sail)
And then measure the sideways resistance they also offer, which will tell the ability to hold height up against the wind.

Such tests used to be standard in the old windsurfing days, done by the German Surf mag and national test institutes...

I use a timecode 68 and infinity 84 and a max sail size of 5.8. I can be up and foiling easily before normal windsurfers get going on a 9m.
Our local anemometer will be reading an average of 10knots with gusts to 14. I'm 89kg on a 131L Naish Micro hover.

The 84 is a complete game changer. And quite fast for a low aspect foil. It is basically like changing up sail by 1.5/2m.

I'm 65kg and sais with either an AFS foil with a 750 cm2 wing. I also recently bought a Moses with the 1000 cm2 wing (W683S). I sail with a 7.0 Sailworks Flyer.

I believe I can take-off in gusts just above 10 knts. As others, once on the foil I can fly in lower winds.

As of the minimum flying speed, it is about the square root of a ratio Surface / weight. So for a same foil family, a 50% heavier rider (and gear) would need a 50% bigger wing to have the same minimum flying speed. We are discussing board speed here, not wind speed.

Take-off speed is another things. The need is to overcome the board drag, and reach the minimum flying speed. I feel that as a bump to overcome.

Because of my lack of technique, I feel more limited by the size of the sail to overcome the bump. Once I feel a good resistance in the sail, I can pump the sail with by bad technique and I take-off fast. Until I don't feel that resistance in the sail, I'm stucked.

I had done back of the envelope calculations that with the 750 cm2 wing I would need to reach something like 6.5 knots to take-off, and with a 1500cm2, it would be more around 4 knots. As I'm not an expert, those figures may be wrong.

JMF

So going thru the thread, the question is, do you think there is a threshold where bigger will have too much drag and will be counter productive? What I see in Balz video is, he is mostly prone surfing then use the wing once in a while with the little swell that is coming in, I guess a big front wing must help. But if a dude is less good at pumping the board and the wing, what front wing will be the best for your weight..and is bigger better?