I think the general rule of thumb is 10%

98, radar arch, wind shield, 225 Merc 3 liter 225's, 63mph

Ryan,
Can you make the real "scarab" logo the right size for the sides of the boat? How much?

Is anybody else running the Yamaha 250's OX66's, if so what prop size and pitch should I run for a better mid/top end???

A friend has a 99 w/ Merc 250 EFI's. He is running Mirage 23's. Don't know his true top speed.

If they don't have t-tops, arches or electronics boxes, it is possible. Sleek hull with modest profile.

I haven't hit mid-60's since doing my sea trial 4 years ago in 40 degree weather.

Would definitely consider a 4 blade prop suggestion from anyone running Yamaha 300hp HPDI's (2-stroke).

I have many of the original SCARAB logos from Wellcraft. I can make them in any size and color you want.

'86 Scarab CC 30', twin Johnson V8 outboards, 4.0l, modified by Monty Racing. 380hp/340tq each. Swapped to Mercury CLE gearcases w/1.87:1 gear ratio spinning 26p Bravo 1's with 4 PVS holes each. 28" setback. No t-top. With this setup, it's run a best of 72mph on GPS. I think there are a few more MPH in it if I were to shorten the setback back to 24".

I guess I need to Measure the logo and get you measurements.

I just got mine home today, 19pitch 3 blade props, engines have fresh power heads, but need tuning. The mechanic that last worked on it disabled the oil injection, so I have to mix it...

I think after a tune up and maybe some 21p 3-blades it should see 60+...