What is the Rigging
?? Steel mast
by any chance??? What is fitted to the top of the mast? Where is the radar
?? Is there a Pilot house? and what sort of weather
protection has been built on it/above it/around it/yadda yadda? Do you have a furling
Headsail? Is you main bundled on the boom with a boom cover?
All these questions add up to windage aloft. In other words, there is a lot of leverage high up above the centre line the boat rolls upon. You may have 4 tonne of ballast, but it is 4 tonne to the righting moment, when the boat is laid horizontal. Any less than horizontal and weight applied to the righting moment decreases. So it take very little energy at the opposite end of the scale, i.e. Mast, to move pivot the boat. The centre of that movement, becomes the fulcrum point.
Now back to the steel mast part. Rig mass can be a positive as well as a negative. Mass provides resistance to movement. So in a heavey sea, that mass can be your alli. The negative aspect, once mass is moving, it resists wanting to stop. So in a Marina, once a wake or wind
moves the boat, it becomes harder to stop the movment.
Now one step further. What about weight distributed below. Such as, where are heavey objects like batteries and fuel tanks
situated. Once again, when heavey objects are centred directly, they add very little to the stability. The weight only has an affect on stability, as that combined mass down below, is swung to the side. But that mass below is what will give you a greater righting moment, when it is pushed out to the side when under sail. The weight from heavey objects, will have little affect if it is at Waterline or even less above it.
The next point is draft
and the shape of your hull
. A deep slender shape hull will act against the mass of water
, and help reduce movement. A round hull, with less keel depth
, will have little lateral resistance. That comes down to design and what the designer
intended of the craft.
So don't panic. The quetions you need to ask of yourself and answer, can I reduce windage aloft? Thats about all you can do. Maybe look at weight distribution, and ensure as much of those real heavey objects are as low down, below the waterline, as possible.
Look att eh waterline of the hull. Is it sitting right? Not too much weight forward or aft. Especially bow down if you use a lot of anchor
and chain. Or aft heavey if you stow heavey gear
to the rear. The boat needs to rest as close to level as possible. This has a big affect on sailing ability as well.
NOTE: I am jo expert on hull design and have a lot to learn on sailing. The above is just what I have learn't thus far, and I stand to be corrected.