Subject: Fuel use for R-27/OB vs. R-29S
There's been much banter back and forth concerning the fuel use by the R-23 and R-27 outboard models.
I now have had the chance to gather some fuel use data for my 2018 R-27/OB with its F300 Yamaha engine and a new 2018 R-29S with its 300HP Volvo Penta engine.
1) Our R-27's F300
Our R-27/OB is getting 1.6 to 2.05 mpg running at 28 to 35 mph in very calm seas and little current going with us and against us at times. Almost zero wind velocity as I recall also.
Typically, just before the boat gets up on plan to go faster it's 1.4 mpg and then as the boats creeps up onto plan it steadily increase toward 2 mpg. As 2 mpg is approached my RPM is at around 4800 to 5000. This is all done with little change in the throttle position. It just seems the boat/engine knows its sweet spot and aims to get to it without any effort being required from me. Very comforting if you ask me.
My boat was hauled out for its first engine 20 hr service (the engine was at 31 hrs) and the lift scale showed it weighed in at 9,300 lbs. The fuel tank was at around 35 gallons, holding tank at 25 gallons and fresh water tank at around 35 gallons. The boat had tons of gear stowed onboard as well.
2) A friends 2018 R-29S
a) At 2060 RPM's doing 10.3 mph and getting 2.63 mpg. The oil pressure was 61, engine temp 185, volts 14.1 and hours on the engine 38. Less then 1 mph in favorable current.
b) At 2990 RPM's doing 17.6 mph and getting 1.68 mpg. The oil pressure was 63, engine temp 185, volts 14.1, hours 39 and still less then 1 mph favorable current.
From the R-29S fuel use data it seems the new 2018 R-27/OB with its F300 engine compares very well with the R-29S's fuel use in calm seas.... plus of course the R-27/OB is moving at 30+ mph. 😀
There's been much banter back and forth concerning the fuel use by the R-23 and R-27 outboard models.
I now have had the chance to gather some fuel use data for my 2018 R-27/OB with its F300 Yamaha engine and a new 2018 R-29S with its 300HP Volvo Penta engine.
1) Our R-27's F300
Our R-27/OB is getting 1.6 to 2.05 mpg running at 28 to 35 mph in very calm seas and little current going with us and against us at times. Almost zero wind velocity as I recall also.
Typically, just before the boat gets up on plan to go faster it's 1.4 mpg and then as the boats creeps up onto plan it steadily increase toward 2 mpg. As 2 mpg is approached my RPM is at around 4800 to 5000. This is all done with little change in the throttle position. It just seems the boat/engine knows its sweet spot and aims to get to it without any effort being required from me. Very comforting if you ask me.
My boat was hauled out for its first engine 20 hr service (the engine was at 31 hrs) and the lift scale showed it weighed in at 9,300 lbs. The fuel tank was at around 35 gallons, holding tank at 25 gallons and fresh water tank at around 35 gallons. The boat had tons of gear stowed onboard as well.
2) A friends 2018 R-29S
a) At 2060 RPM's doing 10.3 mph and getting 2.63 mpg. The oil pressure was 61, engine temp 185, volts 14.1 and hours on the engine 38. Less then 1 mph in favorable current.
b) At 2990 RPM's doing 17.6 mph and getting 1.68 mpg. The oil pressure was 63, engine temp 185, volts 14.1, hours 39 and still less then 1 mph favorable current.
From the R-29S fuel use data it seems the new 2018 R-27/OB with its F300 engine compares very well with the R-29S's fuel use in calm seas.... plus of course the R-27/OB is moving at 30+ mph. 😀