Yup - one of my buddies has a 31' Sonic and tried the P5 set I used, he saw a decrease similar to PE above.....

Got the drive spacer installed, and heavier prop shaft/gear set (now I have an XZ"). The wind was blowing like 30 mph the day I tried to do test runs, so I couldn't get good speed numbers yet.

The handling of my boat was drastically improved, and some friends said the nose was being much better carried (less hull in the water at speed). Best I could tell at mid range I picked up 2-4 mph, but may not have gained at the top end - getting airborne in 30+mph winds above 70 mph gets real interesting in a lightweight Y2K!!!!! WOW!!!

Also lost ~150-200 rpm off top end, hitting WOT just under 5000 on the Bravo I 26P non labbed prop - that's something for BBlades to figure out. I hope to report some better comparitve numbers next day out, then call the prop gurus.

Thanks Keith.

No sweat, this is fun tinkering. I'm going to re-try my buddies Hydromotive five blade PX5 round ear 26P again next week or two and see how it does - Tom what are you tweaking these days on the Y2K?

Hey Keith,
Sounds like you're have lots of fun tinkering!
Just a bit of info for you:
Reading Ray @ Raylar threads and posts on the 425HP/496HO, dyno testing shows the engine makes peek horsepower at 4900rpm. He says the power drops off after 4900 because the intake and throttle body won't flow enough.
Something to consider when you have your prop labbed.
Have Fun!

Keith, I have not done chit! Too much concentrating on business. Thanks to you we will continue our education.

Good point Pat, I forgot that was where the peak was , thanks!!

I can relate!! However, all work and no play........ you know the rest!!!! LOL get out there and enjoy the beast for which you work so hard!

Keith no matter what you end up with ( MPH ) your boating all year !!!!!!................LUCKY YOU !!!!!! Please come to the Superfest.

LOL, wish I could, believe me!! Maybe my lotto numbers will come thru tonight!!!!!