LOL

525 in tantrum got to be 80?

Guessing about that , if it gets +10 mph in a 28 might be more in a 25 cause it's lighter, not sure on my top speed yet with 502mag no gps yet, guessing 67- 68

Tantrum had apretty stout motor in his......not sure of the speed. He sold it to a guy in Kentucky and he says it runs over 80.

I had a 560hp dyno in my 24 pantera, which may be heavier than a tantrum. I had it up to 75. Current owner has it up around 78-79.
A 525 is rated 525hp at the prop i believe, you'd be 80+ w/ that in a 25AT.

Then again... see the thread... by chaos.
"25 active thunder for sale lacated in RI 1998 25 ft Tantrum, fresh water boat and always garaged, 35 hrs on the motor, custom paint, 572 Dart w/canfield salt water series heads dynode @, 672 hp, 679 ft. lbs. torque @ 5200 RPM, Bravo 1 out drive, 30 pitch Bravo 1 prop, Stellings extension box, Mayfair duel ram hydraulic to helm external steering, 380-series K-planes"
... 82mph. hmmmmm.

I am going to send them my prop-they said max. Hp is at 5380 RPM so I am off by 280 RPM-labbing will give me this-just now to find the time to ship prop and wait. I am still debating if it is even worth it?? 400.00 to lab beach the boat and nick the prop??? How much more speed will 300 rpm's actually net me?

risky, i think its more about running the engine in its proper powerband, than the speed you're getting out of it.
I'd 1st try some props before re-labbing yours.

2-4mph...If you lab, you need to budget about $200 a year per lab for prop to maintenance. It is about running in the correct power ban. Less load longer engine life....I would also invest in a back up prop.

2-4 mph gets me 75-78 mph that is worth it. I was talking to a prop shop today and they need to see my prop to see what they can do..thanks for the help