Altered doesn't comply with the 6.5 kg tip weight rule either. That was undoable.

he had to put 2 kg in the very top of his mast and as such his moment of enertia would come out at more than the AHPC superwing mast. This is the problem with tip weights. They are determine by first order moments while the the moment or enertia is a second order moment. So to Altered this was neither fair NOR safe (boat going turtle)

I forgot to mention that in my other posts but there are way to cheat the tip weight rule. You have the 6.5 kg tip weight but with less enertia than the rule aimed to allow.

With progressing knowlegde and simulation it was found that the tip weight rule is less effective then was assumed at the beginning. I'm to blame for that, I know, but now that I know I'm trying to correct the mistakes.

Wouter