2004 50ft. Convertible

[Scope]

Looking for performance numbers on a 50 ft series 3 with Caterpillar C18 @ 1015hp. Best cruise speed , rpm, gph.

Thanks

 

[madhatter1]

Moving up? Nice.

 

[Scope]

No,
A friend is looking at 2005 , trying to calculate best way to run boat to the canyon for overnight
Trips. Personally never been on one.

 

[Cricket]

All depends on how far and how fast you want to get there.

You're probably looking at somewhere in the 2.5-3 gallons a mile at cruise (1950 -2000 rpms) which is probably in the 28kt area.
The C18 Carolina charter boats do not like to run their CATS over 1650-1750 rpms. I doubt those rpm levels are going to get it done on a much heavier Hatteras hull.

Was talking to a friend who repowered his 60' Carolina custom from 800hp 3406e's to 1150hp CAT c18's. So he added 700hp with almost no additional engine weight except a couple hundred lbs for heavier gears.
Not sure what the cruise rpm's are but the old cruise speed was 27kts, he's now cruising the same rpm's doing 33/34kts at the same fuel burn per hour as the old engines, including adding the weight of a Seakeeper.
He had almost 8,000 hours on the 3406e's so he must not be running them very hard.

 

[krush]

....
Not sure what the cruise rpm's are but the old cruise speed was 27kts, he's now cruising the same rpm's doing 33/34kts at the same fuel burn per hour as the old engines, including adding the weight of a Seakeeper.
.......

I am very skeptical of this claim. How can going faster and consuming more HP use exactly the same amount of fuel?

 

[Cricket]

20 year newer technology, same engine weight while producing 44% more horse power, gear reduction change from 1.5 to 1.75. 5 bladed Veems vs 3 bladed Michigans. Replaced the tanks and built new foam cockpit deck, foam cockpit bulkhead and mezzanine, etc, they dropped a lot of weight. Also blasted off 20 years of bottom paint while it was in the shop.