I have both wings, weigh 95 kilo, love them both, but they do offer fun in different conditions, the 633 is not slow, use straps lock in,tune the mast and wings to keep them smooth and silent at top speed and prevent the wobbles,the 633 gets to 27knts, and that is flipping fast, at the limit, but so much fun, but if you want less drama and want a smoother ride and a whole 1-2 knts more speed, but higher average speed then the 639 delivers, keep it moving fast to keep it super smooth, fly upwind better, faster and higher, higher- as its easier to keep it on line maxed out, and even though its slightly wider i can get my small pocket boards edge skimming across the water at a silly angle to fly upwind, jumping is great but so is the 633, but the 639 is not quite as easy to have a blast on, it keeps you engaged, you need to keep it going quickly if you are not light, or risk dropping down without warning around the corners or in waves, in waves then my 633 is king, super curvy fast agressive slashy turns, where the 639 likes slightly wider turns, but keep it moving and it will turn fast, they are both great wings, the 639 needs perfect trim and rides better with the thin moses shim, moses now give you 3 shims to choose from and the thin .5 deg one works a treat, with the mast set more forward by only 10mm more than the 633, both foot straps work so well with both wings,but you do need to muscle the 639 hard around tight corners to get near the 633 turning radius which does the same but so much easier.
Years ago I did not like my old 639,it was called another name back then, I was not good enough to understand how to get the best from it, I was only using one strap and found it hard to keep the speed up to prevent instability and sudden drop downs in wavy conditions, and was certainly not even thinking about boosting, so sold it as my 633 was so much easier to have fun on, still is! but now a few years later I can use the 639 and really get the best from it.
- These users thanked the author Foil for the post:
- nayy (Sat Apr 24, 2021 9:59 pm)