On Dec 19, 9:45*am, Jim White wrote:
At 15:52 19 December 2008, Andy wrote:
. Although ballast does move the cofg forward they say this is
no bad thing as you want to be nose heavy for running ridges and on good
days and tail heavy for weak thermals. Therefore, they argue that you put
water in for good days moving the cofg slightly forward, and drop it when
thermals are weak moving cofg further aft.

I agree with that. My ballasted CG is forward of my unballasted CG
despite the use of the tail tank. I only need about 1.5l to put
ballasted CG where I want it so maybe I don't really need it. My
unballasted CG is set for weak conditions and I had to add nose
ballast at a no water ballast contest as I got very tired of pushing
the stick when running between strong thermals.

Andy