Nantucket 190 E-TEC G2 prop selection

Optimizing the performance of Boston Whaler boats
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InVision
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Nantucket 190 E-TEC G2 prop selection

Postby InVision » Mon Jul 09, 2018 10:57 am

I have now updated our Nantucket with a E-TEC G2 150 HP engine, and am now trying to nail down the propeller for this boat.

The dealer installed a Viper 14.75 x 17-pitch propeller, but WOT put engine speed over 6,000-RPM. Then he installed a Viper 14.75 x19, and the time to plane suffered and WOT only 5,500/RPM.

I wanted to be sure that the engine height was correct so I shot this video. The height was real close. A prop with more lift should be optimal.

We will now try a Rebel 17, which is know for more lift and less slip.

Will report back—M

Proud owner of 2004 Boston Whaler 190 Nantucket ! ;)

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Seahorse
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Joined: Fri Oct 09, 2015 2:03 pm

Re: Nantucket 190 ETEC G2 prop selection

Postby Seahorse » Tue Jul 10, 2018 7:39 am

Check out the RX-4 propeller series, they are remarkable on most boats. Speed is good and the motors may be mounted higher for less drag.

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InVision
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Re: Nantucket 190 ETEC G2 prop selection

Postby InVision » Tue Jul 10, 2018 7:57 am

According to everything I have read the engine height should be set to where the anti-ventilation plate is just out of the water and not submerged shown in video.

I did finally find the part number for RX4 16P prop (177340). I will run the Rebel 17P and if that is not optimal then I will order a RX4 16P which is not returnable. I am pretty sure that 18P RX4 would be too much for the ETEC 150 hp on the Nantucket 190.

Proud owner of 2004 Boston Whaler 190 Nantucket ! ;)

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Seahorse
Posts: 32
Joined: Fri Oct 09, 2015 2:03 pm

Re: Nantucket 190 ETEC G2 prop selection

Postby Seahorse » Tue Jul 10, 2018 9:37 am

That [mentioned advice about height of the anti-ventilation plate relative to the water flow around it] is correct.

On most planing boats an E-TEC G2 can be mounted two-holes higher than the former engine was mounted.