OK, had to get your attention. I need to add some weight to the a** end of my GP RV-4, as the OS .61FX seems to be a bit much. How much weight is to much to add before it's start to comprise any possible flight characteristics.
I did a rough balance and it drops, not quickly, but it will need some in the tail....I haven't even put the tank/batteries/or receiver in yet. I know, I know, I can always move those behind the wing, but just wanted to know how much weight you've had to add to get your bird to balance.
Thanks much.
Wiqar