radar on the mast

[MarkG]

Gleb,

I think you are talking about roll amplitude, not roll period. So what I posted before doesn't apply much.

Roll amplitude seems to be a complicated mix of static stability, damping, wave energy, and wind energy. I don't understand it well enough to say much more.

Mark Gardiner

[Brion Toss]

Hi,
Mark, you are correct, there is so much to determining stability, and I only nibble at the edges of the pertinent calculations in my work. Gleb, if you would like an empirical exercise in the effect of that weight at a given height, just secure a similar weight to the mast there. You can measure roll duration and rate at anchor, and measure heel under sail in a given windspeed. The effect will probably be dramatic. It is also possible that if your boat rolls "a lot" now, there are other issues worth addressing in any event.
Fair leads,
Brion Toss

[asdf777]

This sounds like a great suggestion - I should have thought of this myself.

Many thanks!
Gleb