Hi W100,
I have had quite a bit of involvement over the years giving input into the design of the KA Koncepts. I am a team rider by choice as I love being involved in the development process. In 2013 I was even more involved testing prototypes and suggesting improvements. I had a very good feeling about the changes we made to the actual sail shape after testing the protos, but I was nervous when we got the first production sails out of the loft when we arrived at Luderitz in Namibia for the Speed Challenge in October.
When we unpacked and rigged the sails I was amazed at how good they looked with the new graphics, but more importantly to me, the shape was spot on the design brief. Over the next few days we had extreme conditions even for speed sailing, in a place that was very daunting and very different from our usual speed course. First day, 35-40 knots, very gusty and the narrow, broad course put a premium on smooth, powerful, forgiving sail handling.
Second day was 40-50 knots with gusts close to 60 and I admit I was s***ing myself when I turned the corner on the first run and felt like I was going to be hauled over the front and slam dunked! I instantly realized there was no option but to hang on and hope I got to the end. There is no way to stop, you can't bail out without hitting the bank and losing your whole rig in the wind (we saw sails attached to boards cartwheeling 15m into the air and going hundreds of meters downwind when they got loose). I was sure I wouldn't survive to the end, but somehow I did. It also resulted in PB's for 2 sec, 10 sec and 500m! I am pretty certain that I only survived because that 5.0m sail was so stable and forgiving!
The sail (5.0m) gave me huge confidence and had rock solid stability in 40-50+ knots gusts!! It completely blew me away! Well.....actually, it stopped me from being blown away...but you know what I mean.

So, this years Koncepts from 4.2m to 6.2m have more shape down low
with more progressive twist up top. They are extremely stable yet have a soft, forgiving, light feeling.
I found myself using the 5.4m last Monday in 30-35 knots WSW where I would have previously gone for the 5m, and feeling very in control and fast.It was my third or fourth best 2 sec at 46.3 Knots in less wind than any previously.
Then on Thursday on 20-25 knots of Easterly wind I used the same 5.4m sail and did one of my best Alphas @ 26.54. The sail was rigged with about 1cm less down-haul and a touch less out-haul and felt absolutely fantastic across the wind pulling 32-33 knots, about as fast as I have gone at that angle, and previously that was with the 5.0m Koncepts!
So far this summer I have sailed the 4.6m, 5.0m, 5.4m, 5.8m, 6.2m and 7.5m 2014 Koncepts and every one of them feels really quick and a dream to handle. All, from the 6.2m down, rigged on RDM masts.
I also had a couple of runs on Tony's 6.3m Race at Luderitz in the canal when the wind was really light (only 30 knots!) and I was amazed at how smooth and light it felt on my 40cm wide speed board!
Cheers, Andrew Daff