NC 1095 Fuel Consumption

[jimschilling]

I have a 2022 NC 1095 with twin Mercury Verado 300 HP engines. It is set up with 4 blade 14.5 x17 Express propellers (1.85:1 gear ratio). I am averaging about .6 to .7 MPG at my best cruise speed of about 28 to 29 MPH at about 5500 RPM. All the boat tests I reviewed show a fuel consumption rate of about 1.2 MPG. All of these reviews were with the typical Yamaha engines, 3 blade propellers and much lower RPM's at that speed. I am wondering what other NC 1095 owners are experiencing and what type of propeller setup you have. I suspect I am not propped right which is leading to the poor mileage but not sure which way to go with new props. Any input would be appreciated.   

Jeanneau performance bulletin yamaha.pdf (214 KB)

[tom99]

I have a new 2022 NC1095 twin 300HP Yamahas. The Yamaha console shows 1.2 MPG anywhere between 4000 RPM (28MPH) and 4500 (32 MPH). Not sure exactly what size props but they are definitely 3 blade Saltwater series props.

[ramon]

I have a 2022 1095 flybridge so the twin Yamahas are working harder pushing more weight.  Fuel consumption meter shows 1.0 to 1.1 at 4200 rpm.  your hull has to be fouled pretty bad to be showing the numbers you're talking about.

[rene460]

Hi Jimschilling, There are quite a number of posts in the archives on propellor performance on various models, that are worth browsing through to get an idea of others experience.

Based on the Yamaha bulletin and the other replies, it certainly seems that you are not getting the performance you would expect, and the propellor may not be giving the best thrust from your engines.

The first thing as always is to make sure the hull is clean, not overloaded and that you have it trimmed for best speed when you record your data.  In recent posts another forum member found huge effects of trim, and it was well worth experimenting before taking a reading.  Also check that the propellor is absolutely clean and has no barnacles or other fouling or damage.  These defects have a huge effect on the propellor performance and the power required to drive it.

Then, remember to compare propellor rpm, not engine rpm.  Hence the importance of gear ratio.  Your propellor is smaller diameter and rotating faster than those in the Yamaha test.  The theory generally suggests that the larger propellor will be more efficient.  But blade area and the subtleties of blade shape and profile also make a huge difference.

I would then suggest that you look out manufacturers in your area or other well known brands for their comments on what you have and what they suggest.  They really do have the best experience is selecting the right prop, and a good local one is likely to allow a test or exchange program to help confirm your selection.  They are used to the speed boat boys where every boat is different.  Talk to two or three, you will soon see if there is consensus.  

I hope this helps and that you will report back on your progress.

rene460

[tom99]

Looks like great advice from rene460.

Since I didn't know the other day, I decided to check the actual Props on my Yamahas. They are 15.75 dia. by 15 pitch. The gear ratio on the Yamaha F300 is listed at 1.75 to 1.

Good Luck.

[tedpq]

Oct 3, 2022 17:28:39 GMT ramon said:

I have a 2022 1095 flybridge so the twin Yamahas are working harder pushing more weight.  Fuel consumption meter shows 1.0 to 1.1 at 4200 rpm.  your hull has to be fouled pretty bad to be showing the numbers you're talking about.

Yep to be a little more precise, it's about an additional 500kg of weight for the FLY version.