I have two Nacra 5.7's, side by side. The hull on my first boat will flex slightly when you put your knee into it, any location. Not a lot, no creaking/cracking noise - just a little "give." The second, no flex at all. I always assumed a little flex was normal, now I'm not too sure. Could this be a foam core/no foam core type issue? If it's normal, which is better? The more flexible hull seems lighter, though I can't really tell for sure. I believe one is a"85, the other "87 can't recall which is which.
Thanks
Chris