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89 27' Prop Selection

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Old 06-18-2017, 06:41 AM
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Default 89 27' Prop Selection

I'm helping a friend dial in his 1989 27ft Activator. The boat is currently set up with an XR and a Bravo lower with a LWP. The motor is a 565ci making approx 650hp. The prop shaft is approx 3.5" below the bottom of the boat and we are currently spinning a labbed 28" Bravo turning approx 5600rpm at 80mph, 19% slip!! The prop does't want to carry the bow! I'm thinking trying a 27 or 29" Mirage Plus? This is a non-step hull with the inner strakes running only a few inches from the the transom, certainly dont need to lift the transom! Any thoughts from people experienced with this hull would be appreciated.
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Old 06-18-2017, 07:49 AM
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I'd try a box stock bravo prop first.
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Old 06-21-2017, 11:24 AM
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We ran boat with new 28 Bravo, slip down to 14% from 19%, now 83.2mph at 5500rpm. Good improvement! next we are going to try a std lower gear case as opposed to the LWP. Last fall with a stock 28 and stock lower the slip was closer to 10%. The only thing that changed from last fall was more power in the motor. We shall see?
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Old 06-22-2017, 06:09 PM
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Quote:
Originally Posted by TomR View Post
We ran boat with new 28 Bravo, slip down to 14% from 19%, now 83.2mph at 5500rpm. Good improvement! next we are going to try a std lower gear case as opposed to the LWP. Last fall with a stock 28 and stock lower the slip was closer to 10%. The only thing that changed from last fall was more power in the motor. We shall see?
Only thing changed? Xz versious Xr?
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