Fuel Economy for Cutwater 30CB

[mlanger]

I'm looking at buying a 2019 Cutwater 30 CB with the Volvo D6 425 HP engine. The seller's specs say it "cruises" at 20 knots. Is that accurate? What's the RPM to get those 20 knots? What's the most fuel efficient speed? Is there an online resource I can consult for this?

This is a tough time to buy a boat and I'd like to go into it with my eyes open.

 

[Bruce Moore]

Bumping post delayed in moderation queue.

 

[mlanger]

Bumping post delayed in moderation queue.

Thanks! Going to look at the boat tomorrow so I hope someone does reply soon. 😀

 

[dbsea]

Assuming you’re looking at the one at BYS? Looks to be in great shape. As a Puget sound boater, there are many factors that will impact your fuel efficiency. Currents, tides, wind, etc. if you have a dinghy on weaver davits on the back (aka drag parachute), and you’re also full of fuel, gear, and water, that will also impact your fuel efficiency. I also have a 3/4 enclosure on my Bridge which also impacts my efficiency. I rarely cruise at a specific speed, I’m more of an RPM kinda guy. I like to cruise at about 3000rpm, and at that RPM I find that I’m averaging 16-19 knots, depending on the conditions. Average fuel economy will also be about the 1.1-1.3mpg, and anywhere from 14-18gph. I rarely push it any faster than that.

 

[sjreib]

I echo Dave's comments. I have a 2017 C30CB and my stats are very similar; about 1.2 mpg overall.I have a dingy and bimimi top which adds weight and drag. A fine boat.

 

[HawaiianFish]

I have found my 2019 C30 CB without a flybridge enclosure runs at 18-20knts at 11.7gph - ish.

 

[HawaiianFish]

But…. To answer your full question, the most economical way to run her is at 6-7 knts which I burn just over half of a gallon of diesel every hour. If your not in a hurry you can theoretically go 1800 nautical miles. Theoretically!

She burns .3 gph at idle 600rpm going 3.6-8 knts.

I found for our style of 70% day boating, we like to cruise at 11.5-7 gph going 17-19 knts, which gives us about a 300 nautical mile range per tank. However when you mix in the efficiency used in our mandatory no wake zones, the distance we achieve is much greater.



Most of the people we boat with in this region are on Sea Rays and Carvers, and other large production boats, my single screw somewhat efficient boat draws a lot of envy when they ask about fuel consumption, and find out the draft of the boat.

I am not sure of what your use case for the boat will be, but I can tell you we absolutely love our 2019 C30 CB, and although Ranger/Cutwater boats do have their issues, the design, amenities and seaworthiness, far outweigh any we have dealt with so far…

 

[BB marine]

I don't own a C30 but sea trialed a few before moving on to something else. The C30 is a nice production built boat that will do 20 kts but that is pushing it. When I Sea Trialed a completely empty C30 (not a 30CB) with 3 adult passengers I found 23kts WOT burning 21 GPH. Salt water 1' chop, Tide ? I don't know if I had a current advantage or disadvantage at the time. I found the best cruise speed was around 18kts 20.7mph and 1.2 MPG 17.25 gph. this was right at 3000rpm. I would not want to run this engine any harder than that for continuous use. I have found the best fuel economy is when the boat is unloaded. It only comes down from there !!! I did't purchase the boat or a C30 mostly because I did't want to wait for a new boat to be built and I could not find a used C30 that met my expectations as a Bristol condition used boat. Most that that met that condition were priced at new boat price. That is the market of today. Good Luck with your purchase of your 30CB. Nice boat!