Re: 28 porpusing BAD!!!!!
 

Its the notch in the hull. Its always been a problem. The boat gets up on plane, and starts to run, and is looking for that extra notch in the hull to continue planing on, and its not there, so the boat 'falls off'. Best bet is to have that notch replaced by a professional. The notch has been there for years to put the props in 'cleaner water' but now that boats are running faster then they were when those hulls were designed, its somewhat of a hindrance to performance.

The boat is either always going to need tab to keep away from the bounce, or just can't spend long at mid-range speed.

Re: 28 porpusing BAD!!!!!
 

I don't understand. I had a 28ss with 350 EFIs, and I never had that problem. At 3000 rpm I was going 40 to 42 mph (GPS) with the tabs at 2 and the drives tucked in. Fuel was about 13 gph. The only time it would porpuse was WOT and drives out (about 65 to 68 mph). There must be something in the hull along the keel.
Why don't you call Bruce at Sonic?

Re: 28 porpusing BAD!!!!!
 

I owned a 28 with big blocks in it. The 28 does not require that much trim on the drives probably 1 to 2 at most. The tabs I set at 2, which in my boat was just below the bottom of the hull. On my boat, 0,1, was negative tab. This is just the way my previous boat ran. As speed increased I raised the tabs not the drives...

26 Prowler need help
 

I have the same problem with my 26 Prowler. I am running a Bravo 1 Four Blade with a 22 pitch. I have a newer 496 HO with the Turbulators removed and I am hitting the rev limiter at full throttle. I am only getting 59 mph on the gps so I have to think something is wrong? I called Sonic today and they said I could run a 26 Bravo 1 with that motor? Any help. Please email me @ [email protected].

Please help

Re: 28 porpusing BAD!!!!!
 

I have seen a nose cone fix the porpoise and chine walking on a Checkmate Convincer. It only had a 330 so high speed wasnt the issue. The nose cone settled the ride nicely. Might be something to try.