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We have a small 15 foot boat that (in my opinion) takes way to long to get up on plane. After it gets on plane, it starts to porpoise. The motor is a new 30 horse ETEC with a 3 blade 10x12P stainless prop. Should I exercise all of my options with a 3 blade before switching to a 4 blade. Moving fast is not priority. Getting up on plane at a low RPM is.
 

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Move weight forward...too much weight aft is making the boat squat on take off.
I don't think the prop is too blame. Try jumping on plane with a passenger forward.
See if that makes a difference.
 

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I'm guessing everyone sits on the rear deck when running.
All that weight is putting the hull so out of balance that it
can't get over the hump of water it's creating. Get someone
up front to hold the bow down until on plane.
Trim tabs will help, but hull balance fore/aft is the real trick.
 

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Does it take too long to plane with 1 person on board? Does it porpoise through the entire trim range? Does it porpoise through the entire throttle range? What RPM to you get at WOT?

Does it have a pad on that hull, from the pictures it looks like it is flat in the middle with a little rise to the sides?
 

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Discussion Starter #6
All great questions. I will have to put the boat in the water Sunday to get them all answered.

I have played with trim and JP to try and minimize the porpoising, but no luck.
 

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Take the jack plate off the boat completly, it's not needed. Mount the motor on the transom 1-2 holes up. As mentioned by carolina Jim, I'm wondering weather or not the boat porpoise at WOT.
 
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