Best power for Mitchel Cove 32 lobster boat

[Will]

Posted over on the general diss board hoping Tony will help out. Building a 32 Mitchell cove lobster boat 32×12 est weight to be 13000-15000lbs. Pleasure use approx 300hrs year. Looking for best cruise speed 22kts. Leaning towards QSB 480hp. Hull can swing 26″ blade. Engine and gear recommendations appreciated. Thanks…Will

Topic

[Tony Athens]

My vote would lean towards a QSB 6.7———The Rating you choose would be dependent upon your application, and your need to WOT speed on “show & tell day” vs. your needed cruise speed after the dust settles……….Regardless what what anyone else tells you, realistic or “usable” long range cruise speed making 30-100 miles runs is limited to about 16-17 GPH ( meaning about 350 HP).. That also means that the 425, 480 or 550 version are all the same if you look at it that way….

When you prop , on paper, add about 125-150 RPM to the max rated rpm for initial sizing.. IE, for the newest 480 INT (3000 RPM version) , use 473 BHP 3200 RPM for propping purposes.

Tony

[Will]

New build,hull is being laid up 2019, boat will be finished out and commissioned 2020. Thanks…Will

[Rob Schepis]

Tony,
See below, we had started this in an early post:
https://www.sbmar.com/community/topic/best-power-for-mitchel-cove-32-lobster-boat/?view=all#post-62206

1 user thanked author for this post.

Will

[Tony Athens]

#1 and most important–Is this 2018/2019 new build and will be registered as such?

That will, alone, determine the engine choice you can legally install..

If this is a repower or ??, then you may have other choices..

Tony

[Author]

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