R27 fuel usage

[RalphAlaska]

Hello. Potential new owner here looking to upgrade from a C-Dory 22 Cruiser. We are seriously interested in the Ranger tugs after meeting Andrew and Kenny and inspecting the 27. I am wondering what to expect in the way of fuel economy with the 27 at various speeds. I would also be interested in ideas to carry more fuel, as we are located far from the nearest city in Alaska. Thanks.
Ralph Wells

 

[Levitation]

Almost endless discussions of this in the archives.

Like anything else it is a question of how fast can you afford to go?
The more you lay on the throttle the faster the fuel flows through the engine.
You can burn 1 gallon an hour while leisurely cruising the intercoastal and watching the birds.
Or you can burn 10 gallons an hour while making a nuisance of your self to every other boat in the area.
At bird watching speed your range is a nominal 1000 miles.

cheers :mrgreen:

 

[Barry Cohen]

If we need to get somewhere, we cruise at 10 knots. With our payload, that is about 3000-3100 rpm and 6 gallons an hour.

 

[trailertrawlerkismet]

Denny-O is correct and of course a lot of us with R27's have a Yanmar, where the new R27's today have a Volvo. With that said I'll provide you with some hard numbers from our Yanmar powered R27. Some of these numbers come from fresh water cruising (no current or tide) and some from salt water against a heavy current, with a current , etc. Then there are times with the wind or against it but you'll get an idea.

3650 RPM's, 17.4 MPH, 2.3 MPG

2200 RPM's, 8.5 MPH, 3.6 MPG

2100 RPM's, 8.1 MPH, 3.9 MPG

4050 RPM's, 21.3 MPH, 2.3 MPG this was wide open throttle in fresh water

3350 RPM's, 14.5 MPH, 2.2 MPG

2150 RPM's, 7.6 MPH, 3.4 MPG

2450 RPM's, 9.1 MPH, 2.8 MPG

2600 RPM's, 10.5 MPG, 3.1 MPG

Hope this helps, you will not regret the purchase of a Ranger Tug.

Jim

 

[downey]

We generally run with full tanks at 1570 RPM burning 1 gal per hr at 6 kts. At 8 kts burn 2 gals and at 10 kts 3 gals.
3600 rpm 10 gals at 22 kts.

 

[Brian B]

What if you had the factory install an Airhead toilet then you wouldn't need a holding tank. Search the archives for Airhead those that have them are quite pleased with their function. Instead of a 30 gal holding tank perhaps that space could be used for an auxillary fuel tank :?:

 

[NorthernFocus]

What if you had the factory install an Airhead toilet then you wouldn't need a holding tank. Search the archives for Airhead those that have them are quite pleased with their function. Instead of a 30 gal holding tank perhaps that space could be used for an auxillary fuel tank :?:

If you're buying one new from the factory, this would be my recommendation. I have a used R25 and am in the process of making this conversion, i.e removing the wet head and replacing the 30 gal. holding tank with 30 gal. fuel tank.

 

[RalphAlaska]

Thanks for the replies. This gives us a good idea of the possible range.
Ralphalaska

 

[S. Todd]

When I ordered my R25SC earlier this year I was informed that they would delete the electric head and holding tank system for a very small cost savings, but installation of the Airhead would be something I would have to do myself. Based on the relatively small savings to delete they standard system, I decided against the change.

 

[knotflying]

At an average speed of 6.5 KTS (7.475 mph) I get 3.77 NM (4.33 mpg) per gallon. That is with a fully loaded boat, wife's clothes, makeup and doodads, full fuel and 70 gallons of water.