I am after a 7m sail to go on an Ezzy Hookipa 430 91%. Just for bay sailing when desperate so I am after speed / power. Not fussed on cams unless very easy to use.
I have been using a 2011Loft Blade 7m on a 430 powerex rdm.
Excellent wind range (15-25+) and durability (100+ outings). Has 4 cams but rotates very easily.
http://www.windsurfing.kasail.com/products-page/sail-2012/koyote1/
Another no-cam 6.6 that rigs on a 430 (though it needs 32 cm of extension). Might be too freeride-y for your board though.
I think these are constant curve too (compatible with your mast - not sure about RDMs though)
Imo you wont find an easier Race sail to use then the Loft Blades especially on the RDM
mast. I am Bias though been on them for 4 years now![]()
http://www.loftsails.com/2012/
www.windsurfingsales.com.au/
Kerry, you are welcome to try my 7m Blade and I'm sure you can bum a go on Dr Gas's 7m Switch Blade.
I reckon you might like the O2 better as all your other sails are wave sails, and they are also very affordable.