On Sun, 2 Sep 2007 07:37:20 -0300, wrote:

Thanks, I meant chain plates. My boat has an 11 feet 3 inches beam, 6 feet
draft and 49 feet above the water mast.
The width of the steel cradle is 6 feet with 6 holding pads.
The question is how much will it take to capsize the boat on dry ground?

They make these steel augers which screw into the ground. Used for
tying down airplanes. Not very expensive.

Conversely, I have heard stories that leaving the mast on
during the winter may cause stress on the rigging and loosen the anchor
plates.

I assume you mean chain plates.

Since the coefficients of thermal expansion vary from steel to
aluminum, the one thing they won't do stay the same. Either tighter or
looser. Not sure which. Loosening the turnbuckels a few turns can't
hurt.

Casady