I have a 91 Carbon Fiber Cafe' with 700 hp engines. I'm running 30" 4 blade Bravo props. I have thought about playing around with my "X" dimension by getting either 1" or 2" shorten Bravo lowers. Has anyone tried these on a Cafe'. I referenced the fact that this is a Carbon Fiber boat because I thought it might respond different than a regular fiberglass one.

I'm also considering Boxes. If you've had any experience with these I would also be interested in how they turned out.

Thanks in advance,

Bob

Just curious, what speeds are you currently running ?

My prior '91 Carbon Fiber Cafe with about 575 per side and 25p 3 bladed Bravo's saw 84-86mph on Gaffrig Speedo ( non GPS ) with nose cones.

I'm not really sure. My GPS was stolen and I know the speedo is not that accurate. I think it runs around 85 + ?, from what others next to me say. I should invest in a new GPS before I get too crazy with modifications.

84 - 86 with 25 3-blades? What RPM were you turning those motors? Had to be pretty high.

With 1.5 ratio drives it would have to be damn near 6000. With 1.36's it would be closer to 5200-5300. But he did say it was with a speedo not a GPS, so....

Correct, right about 5200, 1.36's. 85-86 mph was light fuel and load in salt water. Fresh water would see 83-84 consistantly. Derebery Marine SC 600's. Gaffrig speedo only verification.

FWIW - this is the boat / my old boat I'm referring to. The Dereberry 600's are no longer in it though.

http://www.offshoreonlyclassifieds.c...o17182-en.html

I remember that boat from when I was looking for mine. Other than mine being red and gray, they're identical.