Hi.
Need advise on size of sail. What size sail will be good one to sail in 10-15knot. Ihave 140L board and 72KG. Have 6m but never planning.
Reasons for going out at light wind is, 1) take family out, 2) still learning. Please advise me.

A 6 m will get ya goin in 15 knots , just need someone to show you how to give it a bit of a "pump" to get her up on the plane, then you'll be laughin.

i am 70kg, and and the sail i use is a 6.3 and 6.5 for 10 to 15 knotts, and the board is a 110 lter starboard carve. but if i really cant be bothered with using good technique i like to go out on my 160leater and my 8.5. but if you can get 7.0 it will get you goin no problems,

Shall i use 7 or 7.5.
What i meant by 10-15 knot is "yellow arrow" in seabreeze weather report.
I really need advise on 7 or 7.5

Matt H here from Auswind

Def go 7.5 if you want to enjoy yellow arrows. Personally i like the Severne Overdrive as it can be rigged with a little less downhaul ( about 5 - 10 cm shy of full downhaul/ loose leech setting-keeps the leech tight and gives extra grunt in the bottom half of the sail's range) and out haul set to deliver quite a deep draft (sail just touching the boom at the back end) - The sail is super easy to rig and delivers a really springy dynamic grunt when rigged like this.
As an 85 kg rider on a 105 litre isonic, with some rig pumping (this is where the springy sail setting delivers big time) i am planing before most crew (formula gear exluded)- dont even really need to go to a fin bigger than 34cm. With your 140 litre board and 72 kg combined with some smart rigging you should be going super early on a 7.5!!

Dont make the mistake of cranking on the downhaul in light air - seen plenty of riders kill ther bottom end doing this.
When it gets windy and you really start to feel some power in the sail THEN its time to go for the loose leech and flatter outhaul trim. The Overdrive has a massive rigging range in that it can bet set up to feel great in light or windy stuff!! (Scott Mckercher used one in the ledge to Lancelin 2 years ago and came in second behind Jesper Orth by only meters - so the top end is there!


you can see a cool movie of the overdrive in action here:



The world most powerful 7.5 is the Severne Glide - it has the power of a 9 (german mags rated it highly) and was designed soley with bottom end and low weight (high performance exclusive e3 sail material was used) in mind. As far as i know no one else on the planet has done a sail design like this one.

Personally i love the glide as you can be blasting in 10 knots but the super light weight means duck gybes and full carving gybes with great exit speed, carving 360s etc were achievable. I personally dont like the rig weight and extra hardware (another boom, another mast) that sails over 7.5 require (but id do like the power)

Glides can be hard to find though...