Weight/trim issue in 18' bow rider

[Bswiernik]

Hi all. I have a 1997 18' Rinker bowrider with a 4.3 alpha one. I have a question about my trim. When there is about 5 people in the boat, I can ride whatever speed and rpm I want and the trim seems to work great. Once I hit 6 people, about 1000lbs, the boat will porpoise non stop with the trim down all the way. I can do 22 with it trimmed down and be fine, and I can run it at 4000 rpm about 35 and trim it out, but anything in between rides terribly. Is this just the way a smaller boat is loaded up with that much weight? Thanks.

 

[smokeonthewater]

Get smart tabs... It'll be a whole new boat

 

[Chris1956]

It shouldn't do that. With the six people, you are pretty well loaded for that powerplant, but it shouldn't porpoise. Is that behavior when the bow seats are full or not?

 

[Bswiernik]

I've had people move around the boat. More weight in the bow, less weight in the bow, go left, go right. The weight does not seem to make any change. Thanks.

 

[jakedaawg]

Get a long plate to plate level. Place one end at the stern on the bottom of the boat and hold it tight to the bottom. You are looking for a rounding of the hull as opposed to a hook at the stern. The final four feet or so of a rinker is usually flat and should have a "fair and true arc" towards the bow.