Hi guys what are your thoughts on adding a 30cm mast extender to a SDM 400 mast, will only be used in flat water on wave and free ride sails, will it significantly change stifness etc, just trying to buy one mast 
I do the same on my rdm, but am a lightweight at about 72kg. Works fine, just flexes off before I get overpowered.
My priginal one was just a piece of confuse.
Should be no issue.
It's actually the specs for my severne 5.5. 430 on a 400 RDM. I agree it's great to minimise masts where possible http://www.severnesails.com/wave-sails/severne-blade-1
