Prop setup help

[wibass]

Working on a SF21 Triton which is an older 21' fish and ski with a newer 225 HO G1 evinrude and 6 inch jack plate. I understand this is a 60-65 mph boat. I have the jack plate all the way up so the prop center is about 1" above the pad, 25 pitch 3 blade Tempest Plus, 5900rpm, 61 mph but it is trimmed all the way upto where the first stage of trim ends. That seems odd to have to trim that far up to where it would be pushing the stern down. I checked the p to p with hull level and cavatation plate on motor level which is about 1/2 as much trim as I'm running. Get's up on plane with easy and the boat feels a little loose at 60mph like it's on pad. I moved 2 trolling batteries out the very back in increments up to the rod locker. The farther forward the slower the boat got no matter how I trimmed. I'm looking for some prop suggestions because it does not seem right to have to run that much trim. Thanks.

[pmgoffjr]

You’ve been given bad advice. It happens.
Most hulls run best at full trim. That’s normal.

If you are really 1” above pad I’m surprised it runs at all. Way too high for a bow heavy FnS.

Put your batteries back where they belong load up like you’re going to fish and go find your correct height.

Go down 1/4” at a time until you lose speed then back a click. There isn’t a shortcut to find each rigs optimum.

[Rip Bass]

In addition to Mr Goff’s advice,lower your engine down to 3.5” under pad and start there,it will save you some time and you might be able to go up a little from there,1/4” increments. Very few hulls run well above the pad and those are light weight boats like Allison and Bullet,yours won’t.

[wibass]

Appears like stern of boat sits low but foam doesn't seem water logged. With the motor high with tempest plus 24p It throughs big rooster tail so I lowered about 1" and tail is less than motor hieght. Speed stays same at 61mph 6000rpm with normal load and me. That's probable as good as it gets. I have an older 25p trophy plus to try when I get time. Thanks for the advise!

[pmgoffjr]

Rule #1 on setup: Take it too far and bring it back, so keep lowering until you lose speed, and then back up a click, THAT is the only way you find just right.

[skennedy]

I can’t believe you even have enough water pressure running the motor that high . Lower it to 3.5 “ below pad like suggested before . That is alway a good place to start you will be plus or minus a half inch from there depending on your propeller.

[mdtritn21]

You never will get any speed from that boat with the batteries up front so do as Pat said and put them in the back.