Boat hops up and down

[bassangler33]

I have a 14' grumman deep v with a 25 hp johnson,when at full throttle the boat seems to hop up and down. ive adjusted trim as low as i could ,it helped but still hops. Any help would be greatly appreciated

 

[crazymanme2]

Where is your cavitation plate in relation to the bottom of your boat?Also, look at the bottom of your boat,is it flat or does it have a slight curve to it?Use a straight edge.

 

[WhiteMoose]

I believe the technical term for that is "porpoising". I don't have any advice, but that term might help you in your search for a solution.

 

[Outdoorsman]

Maybe a Hydro Foil...

https://www.shopzilla.com/boats-kayaks-boating-equipment/hydrofoil-stabilizer/12180101/products

 

[rudycard72]

Even out your weight distrubution and that might help. I have a 14ft flatbottom with a 20 horse johnson that used to do the same but after I added a casting deck and moved my gas tank to the bow the problem went away.

 

[bassangler33]

Where is your cavitation plate in relation to the bottom of your boat?Also, look at the bottom of your boat,is it flat or does it have a slight curve to it?Use a straight edge.

I took a pic of it this doesnt show it but it is just a hair above the bottom of the boat.The motor is all the way down on the transom

 

[huntinfool]

I would start with raising your motor about 1". If that did not help it I would look at weight distribution. If that is not possible then I would consider a hydrofoil.