catamaran resistance

Your best option is to quickly pass on the job to a professional company who know what they are doing.

 

Some catamarans have low bridge clearance and the bow wave and natural waves hit is creating drag. On high speed catamarans it can be used to advantage to create lift and decrease drag.

 

Now it is clear, you're talking about the wet deck, not bridge. But that's not slamming, that's the beat of the waves, and air pressure, there is compressed. The wave pircing try to avoid these effects.

 

He means waves will slam into the bridgedeck, especially if it's too low or presents a surface normal to the wave velocity.
Wave piercing hulls won't counteract a poorly designed and placed bridgedeck.