How to calculate ballast tank volume?

[wingtip]

Any ideas on how to roughly calculate the required volume of a ballast tank... im guessing my total weight is gonna be anywhere around 11+ pounds... I know i may have to tweak the size upon first sea trials but how do i get in the ballpark with such a large hull and weight that im planning on.....

a few pics are in my rc heli gallery at http://www.runryder.com/helicopter/gallery/2102/ towards the bottom of the page....


this is a compressed air system, with 2 onboard small compressed air tanks....

[Guest]

We've been over this ground

We've been over this ground many times before.

Look here for a clear and lucid explanation-

http://www.subcommittee.com/cgi-bin....+sizing