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Lessening a porpoise

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Old 03-07-2018, 07:57 AM
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So which way would be best to spin props? In or out?
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Old 03-07-2018, 06:58 PM
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spinning then out will give you more transom lift and probably kill any porpoise but it will probably kill a few MPH.
With a Bravo drive it is easy to test all you have to do is swap props and run the shifters backwards.
You can't do that can you - you have to swap transmissions right?

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Old 03-07-2018, 07:09 PM
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Originally Posted by Tinkerer
spinning then out will give you more transom lift and probably kill any porpoise but it will probably kill a few MPH.
With a Bravo drive it is easy to test all you have to do is swap props and run the shifters backwards.
You can't do that can you - you have to swap transmissions right?
have to swap drives left to right
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Old 03-07-2018, 07:43 PM
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Yes, just drives
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Old 03-07-2018, 09:16 PM
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At least that is easier than swapping trans.
My 34 Scarab had Bravo drives. I tried just about everything to get better handling and top speed. The boat handled better at slow speeds with the props turning out but it ran bow down.
With the props turning in I gained about two MPH and handled better but slow speed suffered. labbing the props will allow you to run less blades and or higher drives.
With my 26 Daytona I am able to run 4 blade props with a -3 Imco drive and the props are 2 inches above the lowest point on the hull. Labbing the props helped noticeably for the boat to get on plane.
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