Best cruising RPM

Status
Not open for further replies.
therobesons

therobesons

.
Jun 7, 2009
116
Hunter 1999 Passage h420 CC Oceanside
My Stock 1999 Hunter passage 420 has the stock 3 blade cruising prop.
Does anyone know the red line of the 50-hp Yanmar and at 3/4 throttle, what the cruising RPM would be. I am assuming 3300 redline and 2450 at 3/4 throttle, does that sound about right.

Also what kind of performance/speed do you get at that RPM?
What is your burn rate?

I am gathering info for a cruise, relocating my boat from Oceanside Cal to Portland Oregon, more info I have the better prepared I will be.

Thanks in Advance
Bob
 
Sailgunner

Sailgunner

.
Jun 4, 2004
1,087
Mainship Piliot 34 Punta Gorda
On the top of your engine is a plate. It indicates Maximum RPM and Continous running RPMs. Your max may be around 3600 and continous around 3400. You can run at the continous rating as long as you want and at max for around 30 minutes. If you have an engine manual it may have a curve for best fuel economy. For most efficient operation you are probably good around 2800 rpms. I burn around 1.25 gal/hr at 2800 RPMs and 7 knots. I have a flexofold prop that is oversized which is not good but that is where I am with my 50 HP.
 
S

Saillife

.
Apr 5, 2011
113
Hunter 34 Tilghman Island, Md
Look at the plate as sailgunner said. Normally you want to be running a diesel engine at 70-80% of the continuous rating.
 
sailor420

sailor420

.
Nov 9, 2004
110
Hunter Passage 420 Rock Hall, MD
our 2000 420 burns consistantly 1gal/hr @2700 rpm with a speed of 7 knots. Surprisingly @ 2400 the burn rate is 3/4 gal/hr with a speed of 6 knots
 
Status
Not open for further replies.

Top Bottom