A boat as small as 16 foot most likely did not have ballast to offset the force of the wind on the sails. A keel boat will lean so far before either the rudder looses "grip" and the boat heads into the wind or the boat and wind finds a happy medium. I have sailed my 23 foot boat in some heavy winds and it has healed over 40 degrees or so and then did not go any more, it found its happy medium. To get knocked down would take a lot on a boat your size. A lot of wind and some big waves hitting you from the side at the same time.