Yacht Capsizes

How come sailling yachts don’t blow over and capsize when you see them tilting loads on one side?

like this

A sailboat is usually ballasted with lead (sometimes iron, even water) in the lower portion of the hull. This is in the keel and can take many forms and shapes…i.e. full keel, cutaway, shoal, fin, bulb, daggerboard, centerboard, etc.
The weight of this varies by the size of the boat. Example, on a 25′ full keel, the boat may displace 4,000 # and the ballast can be around 1,800#.
This helps keep the boat upright.
When the wind is blowing sufficiently or the tack is driven to such an angle that the boat starts to heel over, the center of gravity is changed. This brings the COG over so that the boat can still sail without capsizing. That, and as the boat tilts more and more, then more air is released from the sails thus some balance is maintained.
Each sailboat has a Point of No Return where she cannot “gain her footing” and will capsize. This depends on design, amount of sails in square footage, keel design and weight of ballast.
Usually, sailboats can be heeled over quite a bit without this becoming a reality. I’ve had my sailboat over by more than 40 degrees and it was fine.
Each sailboat is different in this regard.
Hope this helps.

Yacht Boat Epic FAIL!! // Failed Launch Capsizes Yacht Boat