MikeyG said..
My biggest kite is a 9m Airush Ultra (it's a single strut). Flys really well in 10 knots of wind and is still quick. The way I see it, if you want a fast kite - go small and light. I wouldn't go bigger foiling and I've gad the ultra in 5-15 knot days.
Only problem with the Ultras is if you drop them in the drink in really low wind and soak the canopy (e.g. land the trailing edge first), they don't drain water easily.
Ultras are a great low wind foiling option in deed. The Ultras were designed for performance and the compromise is with relaunching. You need more skills to relaunch a kite like the Ultra in low wind, mainly due to the kite's shape but also the reduced diameter of the strut and leading edge. In the 2020 kite lineup Airush released the One Progression (beginner friendly single strut kite) which is much easier to relaunch than the Ultra, with a lower aspect ratio and larger central strut and Leading edge. This would be an ideal choice if you still crash the kite a lot when foiling.
We chose to replace our Ultras in the school with One's mostly because of the ease of relaunching. The One still works really well for low wind foiling as long as you're not looking for a high performance kite.
Been using the 12m Ultra for foiling for the last 3 years, wind range about 8 to 15 knots max. Using longer lines for anything 10 knots or less. It performs really well in light gusty winds as well when foil kites tend to collapse and tangle.
Here is a clip of the 15m Ultra in less than 8 knots.
.be
We have Ultra's and One's available for Demo at Pinnaroo Point, Hillarys, WA.
Christian