S-1 on non-Severne mast
I donīt use a Severne mast...I ride my S-1 either with 400 or 430 cm 19/21 IMCS 100% carbon...and I can say that the sail is perfect. Easy to rig, responsive, lively and stable when powered up.
I think it will be working...btw. Severne masts are done by Powerex I think.
If you want to be sure go for Powerex...a bit cheaper then Severne and it should be the same piece of carbon.
Enjoy your Severne!