Most people agree that porpoising is caused from the prop not being able to "carry" the bow and the bow "falls" then the prop lifts again and falls again. And most people seem to suggest a prop with more bow lift to correct the problem. Right?

Well, I was thinking this morning and in certain situations could it be the opposite? What if a boat has good natural bow lift. Could it be possible that a bow lifting prop, in combonation with the natural tendencies of the hull, is trying to raise the bow TOO MUCH, and then falling creating a porpoising situation. So, maybe, just maybe could the answer be this boat would need LESS bow lift, not more, to correct the porpoising.

Just thinking out loud here. Any opinions?

What kind of boat are you talking about?

You are correct in that each and every boat is different, so the causes will be different. Therefore the prop solutions will be as well.

Julie

Well I was talking just in general. But my boat(Pantera 24) does porpoise slightly in dead calm water which is what got me thinking. If I send my prop in to get labbed should I add bow lift like most people suggest or actually take a little away. I'm rarely in calm water so it doesn't reallyu bother me. It just got me thinking.

Your theory is sound.

Prop depth and bottom trueness can determine the outcome and decision greatly. If your never in calm H2O, and run true in most conditions, don't add the bow lift.

A slight porpoise in flat calm water is not unusual for many boats. It's uncommon for many to run in a situation when the water is completely smooth so on the rare occasion when they do, a light porpoise may be encountered. It's something that can usually be solved by adjusting the drive trim a little.