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."
http://www.usboattest.com/boat-tests/express/2001/regal/commodore-3780/81/2001-regal-commodore-3780.html

This estimate seems logical. I get 34mph with gassers and the Yanmars get a little better but they have quite a bit more HP.
--2002 3880 Regal Flybridge | Twin Merc 8.1HO| **Seven**
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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

Chris,

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.
Gary Kelly
Mount Sinai, NY
2001 Regal 3780
REPOWERED WITH YANMAR 2011
Smooth seas never made a skillful mariner
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Re: 2001 Regal Commodore 3780 top speed

Postby chriswhite » Wed Feb 21, 2018 4:07 pm

kellyg wrote:Chris,

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.


Many thanks for your responses. The bottom and props were clean. However, the spec sheet on the cumming 340 is at WOT the rpm should be 2800 max. My tach actually reads 3300. I thought it might need a tach adjustment. It has Faris tachs that had some work done prior to me buying. The 24 mph was a fully loaded boad with diesel, dingy, battery and 15 hp, water and 4 200 pound guys.

Thanks. chris
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Re: 2001 Regal Commodore 3780 top speed

Postby kellyg » Thu Feb 22, 2018 10:52 am

Chris,

Two things come to mind. First, are you actually turning 3300rpm? Forget about the Faria tachs, get yourself a photo tach and check each engine. They are cheap and extremely accurate.
Next, if you are actually turning 3300rpm while only achieving 24mph,yoy may very well have to change your props.
Do you know the size and pitch? Don't rely on the stamping as they may have been altered. Bring them to a shop and have them scanned.

The load onboard should have little to do with your speed as that little bit of weight is insignificant.
I have Yanmar 315hp and when fully loaded with fuel water, tender and people, I can still obtain 31mph.
Gary Kelly
Mount Sinai, NY
2001 Regal 3780
REPOWERED WITH YANMAR 2011
Smooth seas never made a skillful mariner
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