AllDodge! I just read this tread. Nice build. Did you time your props? I never knew what this could do till Bup posted about this on other tread.

No I didn't have them timed, going to go and look timing up. don't know what it consist of. I do plan to have my current props checked (26) at the end of the season. Kind of wondering if I might have something else going on. Seam to remember checking prop slips before the build when I had 24 pitch, and don't remember it being that bad.

Link?

I've always followed the Merc manual on this, but want to see what BUP had to say. John has tons of experience.

I always set the inner (bigger) prop with a blade straight up under the cavitation plate. Then install outer (smaller) prop with the blade from the inner prop directly between the space between two blades of the outer prop.

Knot 4 Me I think that's right. I will try to find the post.

That's the way I do it, just wanted to make sure BUP hadn't learned something via experience or factory seminars, etc.

If memory serves, the Merc documentation you used to get with your boat shows timing for the Blackhawk but does not make mention of doing it for the Bravo III. Obviously the same timing would apply. I'll dig thru my old manuals and see if I can find it.

Never would of thunk it, they both spin but go figure. Today is a good day, I learned something

I imagine it has to do with the inner prop optimizing water feed to the outer prop?

Old thread on XR props, cavitation burn with higher HP, effects of bad prop timing, proper prop timing, etc. Only takes a few minutes to get thru.

http://www.offshoreonly.com/forums/p...-prop-set.html