2001 Regal Commodore 3780 top speed

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2001 Regal Commodore 3780 top speed

Postby chriswhite » Mon Feb 12, 2018 12:32 pm

I recently purchased a 2001 Regal Commodore 3780 / 3880 /4080 with twin Cummings 340. Top speed with boat loaded fuel / water is about 24 mph. Is that about right? Thanks!
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Re: 2001 Regal Commodore 3780 top speed

Postby Seven » Wed Feb 14, 2018 2:19 pm

I do not have that engine combination but that sounds low.
Were WOT rpm's within spec? Was this speed using GPS or the speedometer? I would not trust the speedo.
If rpms are good and using gps then you should check the props are the correct ones or maybe bent.

Not sure how accurate this is but under the review tab this boat test stated
"We topped out at 32 mph at 3,000 rpm and the Cummins delivered a solid 26 mph cruise at 2,650 rpm."

This estimate seems logical. I get 34mph with gassers and the Yanmars get a little better but they have quite a bit more HP.
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Re: 2001 Regal Commodore 3780 top speed

Postby cbsmith » Wed Feb 14, 2018 2:40 pm

If there is any growth in the hull it will add a lot of drag and greatly slow the boat down as wel.
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Re: 2001 Regal Commodore 3780 top speed

Postby kellyg » Wed Feb 14, 2018 3:18 pm


That speed is quite low. As mentioned above, be certain that the hull and props are clean.
What RPM's are you able to reach at WOT? Do you have any smoke from the engines?

I test drove that boat back in 2001 when brand new and was able to reach 32mph, confirmed with GPS.
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Mount Sinai, NY
2001 Regal 3780
Smooth seas never made a skillful mariner
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