Originally Posted by Captain YARRR (Post 4309691)

I have twin 400 HP 383s, Mirage Plus 23s. Not sure on X dimension. Keep getting over speed on port when I start to trim out.

Originally Posted by thirdchildhood (Post 4309644)

If switching to a Bravo 1, go up in size one pitch. They tend to be over-rated. A 26p Bravo should keep you in the same rpm range as the 25p Mirage. I had to find this out the hard way. I'm running a 30p Bravo 1 with 1.5 gears and I doubt I could pull a 30p in any other prop. I think you should try one. The shorty worked great on my boat and if you do that you will almost certainly need four blades. I don't know how the shorty will work on a 29' boat though as you will lose bow lift due to less leverage (higher prop).

Originally Posted by phragle (Post 4310034)

I always thought that was the opposite.... since 4 blades have more bight they take more to turn so if you have a 25 3 blade you would need a 24 4 blade...

Originally Posted by 01scarab29 (Post 4310022)

I believe we have the same dyno guy, Full Throttle Marine. What boat do you have ? can you measure your propshaft height ? I think we can trade a lot of information.

Originally Posted by SFOcean (Post 4310118)

Bravo props do measure about 1" smaller actual pitch than their rating; how they hook up (slip at various RPMs) can be different for every boat.

Originally Posted by bbladesprops (Post 4310354)

Agreed. Every application desires certain propeller geometry for certain performance goals. One prop design will propel a boat but specific goals can improve by changing props.
I also agree the reported 9% slip can potentially be left alone unless you are desiring better cruise speeds or planning.

Brett

Originally Posted by 01scarab29 (Post 4310820)

My desire is getting the most out of what I have. I'm 7 3/8 deep and wondering if I install -2 Imco's what prop would be looking for. In a somewhat perfect world... And will a -3 Imco bolt to a Bravo1?