Originally Posted by codprawn
I would NOT say it's complete bollocks - the deeper in the water a prop is the more grip it has. In very rough seas there are bound to be times when a surface drive is strugging for grip more than a normal drive. Think about it - if the props are very close to the surface it is bound to happen that they come out of the water more often.
Regardless of the above it doesn't really explain why many of the fastest offshore
race boats are driven by surface drives! Not too mention that they are also generally more reliable with big power!
ps Surface drive props are designed to work that close to the surface - they may have slow acceleration, but grip well at top speeds!