14' Mckhee craft with 87 johnson 60hp porpoising bad

[snake91876]

I have 70s mckee craft converted to center console with a lot of weight in back. I have a 17pitch uncupped prop with the anti ventilation plate running even with the keel of boat. The boat is crazily bow high when i take off trim down and porpoising or bouncing up and down once on plane. The trim is all the way down and still does this. I know it can be corrected as i previously built the same type setup with a 50hp that didnt do this. Will changing the prop help or will raising the motor a/v plate above keel help. Im also thinking about static trim tabs but would like to not have to spend that money. Any suggestions!!!!!!!

 

[Mi duckdown]

Re: 14' Mckhee craft with 87 johnson 60hp porpoising bad

Trim it up slightly once on plane. Or am i missing something?
How long does it take to get, on plane from a hole shot?

 

[snake91876]

Re: 14' Mckhee craft with 87 johnson 60hp porpoising bad

it will jump on plane quick if i take off too quick the boat actually bounces and the prop will cavitate, i have to kind of get in it 3/4 throttle get on a plane which it does instantly but once i back out of the throttle a little trimmed up or down it will go to bouncing steadily .

 

[Mi duckdown]

Re: 14' Mckhee craft with 87 johnson 60hp porpoising bad

Pics Of your set up. There is No reason with, power trim, that boat will not plain at a comfortable speed. unless you are over powered. Is the motor and transom oK, Same height?

 

[snake91876]

Re: 14' Mckhee craft with 87 johnson 60hp porpoising bad

ill get a picture what do you mean are motor and transom same height