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Posting a reply to: Re: prop blades/rpms

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[QUOTE]lambeau - 4/8/2008  1:52 PM

[QUOTE]I have not run either of these props mentioned, so I would be "out of line" trying to make a guess as to how they would compare against each other...
To be honest, I think there might be a bit too many variables here to make any good call on how the two compare.  If you can, get out there and test them...enjoy running the boat if you have open water.[/QUOTE]
last year i ran both the Tempest and High 5 props that the original post asked about (200hp Opti on my Tuffy 1890).
the results were about what you'd expect them to be...the Tempest was incredibly fast and powerful, whereas the High 5 had more lift leading to increased handling but slightly less top end speed (though still quite fast). the Tempest put you back in your seat with a hole-shot that launched the boat forward whereas the High 5 lifted the boat up and out with a smoother transition to moving forward.
the High 5 ran higher rpms than the Tempest.

as VMS notes, the High 5 has a smaller 13 1/4" diameter in order to be able to turn enough rpms and the 3 blades on the Tempest are just plain big at 14 5/8". it's kind of hard to compare "all things equal" since they're not made that way.

if you're like me, Jono, and don't really know the specific rpm changes to expect for each change in diameter or pitch, and if you've got access to a variety of props at your dealer, try testing the impact of either a change in pitch, change in blade numbers, or change in diameter in increments, ie., don't change everything at once, but rather make small changes with each test so you know what it is exactly that's giving you the performance change. watch your rpm gauge, and take good notes on the change each prop gives you and how you like it's performance.
[/QUOTE]

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lambeau

Posted 4/8/2008 1:52 PM (#312303 - in reply to #312279)
Subject: Re: prop blades/rpms

I have not run either of these props mentioned, so I would be "out of line" trying to make a guess as to how they would compare against each other...
To be honest, I think there might be a bit too many variables here to make any good call on how the two compare. If you can, get out there and test them...enjoy running the boat if you have open water.

last year i ran both the Tempest and High 5 props that the original post asked about (200hp Opti on my Tuffy 1890).
the results were about what you'd expect them to be...the Tempest was incredibly fast and powerful, whereas the High 5 had more lift leading to increased handling but slightly less top end speed (though still quite fast). the Tempest put you back in your seat with a hole-shot that launched the boat forward whereas the High 5 lifted the boat up and out with a smoother transition to moving forward.
the High 5 ran higher rpms than the Tempest.

as VMS notes, the High 5 has a smaller 13 1/4" diameter in order to be able to turn enough rpms and the 3 blades on the Tempest are just plain big at 14 5/8". it's kind of hard to compare "all things equal" since they're not made that way.

if you're like me, Jono, and don't really know the specific rpm changes to expect for each change in diameter or pitch, and if you've got access to a variety of props at your dealer, try testing the impact of either a change in pitch, change in blade numbers, or change in diameter in increments, ie., don't change everything at once, but rather make small changes with each test so you know what it is exactly that's giving you the performance change. watch your rpm gauge, and take good notes on the change each prop gives you and how you like it's performance.