C.B. 14.2
Don't know for a 16.5, but my Capri 14.2 has a centerboard that pivots up into the cockpit and toward the stern. This requires a strong pull on a line and the centerboard can be held up by clinching the line. I guess the weight of the C.B. holds it in place even when capsizing. However, hitting an obstruction under water is not recommended as rocks cause damage. Dick