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lee
09-08-2008, 12:25 PM
i have a 81 classic 18 with a stroker 383 390 hp and a alpha drive 1.5 want to spin a 4 blade prop was wondering where to start my boat has never had a correct prop on it so far i've been told 23p25p27p
BigGrizzly
09-08-2008, 04:26 PM
Lots of choices out there but I would prefer to try a 3 blade first.
BUIZILLA
09-08-2008, 05:41 PM
i'm going to a$$ume you have trim tabs?

if so, I would get a box stock 25 Mirage or 24 Turbo and start there
mrfixxall
09-11-2008, 09:07 AM
lee,left or right ? i have a few you can try..
The Hedgehog
09-11-2008, 09:32 AM
I would not start with a 4 blade. My 18 with a 383 did not like it that much. It loves the Turbo
mrfixxall
09-11-2008, 10:05 AM
It loves the Turbo.

You betcha! I second that :)
TREYSTJOHN
09-11-2008, 10:40 AM
With that power, you may want to install a hydromotive cone prior to prop testing as you should be able to approach/surpass the 75mph mark with proper set-up, although i have never run a 75mph+ 18 without one or a speedmaster/shortie, but I would assume it should allow prop to bite harder and reduce tripping induced chine walk. Has anyone else done a no-cone to cone test on similar set-up???

And we never put 4 Blades on Alphas to reduce shifting & wave jumping impact stress on internals
The Hedgehog
09-11-2008, 11:11 AM
With that power, you may want to install a hydromotive cone prior to prop testing as you should be able to approach/surpass the 75mph mark with proper set-up, although i have never run a 75mph+ 18 without one or a speedmaster/shortie, but I would assume it should allow prop to bite harder and reduce tripping induced chine walk. Has anyone else done a no-cone to cone test on similar set-up???

And we never put 4 Blades on Alphas to reduce shifting & wave jumping impact stress on internals

KY Donzi runs 75 mph on a bravo without one.

I have heard so many mixed reviews on them. I would like to know as well.
BigGrizzly
09-11-2008, 04:57 PM
I have don a before and after test. Even Hydromotive will tell you that you will probably pick much if anything on a under 75 mph boat. On mine it made it handle better got a tad better fuel economy, and the idle side to side was reduced. What I did not do was compare it to a pointed nose cone. Would I put one on again -Yes,