melida
Member
- Apr 1, 2009
- 897
- Boat Info
- Sea Ray 2007 375 DA
Sea Ray 2005 315 DA Sold
- Engines
- 2xYANMAR 6LPA-STP 315 HP V-drives, 4kw Onan gen, radar, gps, autopilot, bow&stern thrusters, sat tv
Last saturday I filled fully the fuel tank and then went for a short ride only me without any acceleration problem.
On sunday me and my buddy (both of us weigh 200+kg) full diesel, full water and water heater, campers on and provisions for two people. Weather was sunny 22C degrees and sea was as flat as glass.
Boat got up on plane perfectly. Reached 3000 rpm and did 19 knots. On the way back home we were upwind but the wind was barely swinging the flag.
To test my boat's performance before haul out that was a perfect sea/wind condition. Did fast cruise at 3500rpm and got 25-27knots and did wot but got 3700-3800 instead of 3900-4000rpm due to 3 weeks before cleaned hull/leg/gear fouled again.
To maintain the cruising/planning on the way back home I had to do 3100rpm, fully retracted trim tabs and +1+2 degree drive trim OR 3000rpm, 1/4 1/2 trim tabs and 0 degree drive trim.
IMO doing 3100rpm felt me better than the 3000rpm because the sound of engine/hull and rooster tail was flat and away from stern as a clean hull. But When I did 3000rpm and before applying tabs and keeping leg at 0 degree, a little bow high like need to hit throttle a bit more and rooster tail was in the mid of stern and it's place where to be normally.
Doing two scenarios gave me the same speed but I preffered the 3100Rpm and respective tab/leg settings.
Here comes the magic question.
Which case of scenario gives me the best/better fuel economy while hull/gear is fouled or clean but loaded since I don't have a onboard computer or fuel flow meter.
I know that less drag (properly trimmed hull) but high rpm should be the better.
Let me know what other (especially 280DA owners) members thinks and suggest.
Thanks in advance.
On sunday me and my buddy (both of us weigh 200+kg) full diesel, full water and water heater, campers on and provisions for two people. Weather was sunny 22C degrees and sea was as flat as glass.
Boat got up on plane perfectly. Reached 3000 rpm and did 19 knots. On the way back home we were upwind but the wind was barely swinging the flag.
To test my boat's performance before haul out that was a perfect sea/wind condition. Did fast cruise at 3500rpm and got 25-27knots and did wot but got 3700-3800 instead of 3900-4000rpm due to 3 weeks before cleaned hull/leg/gear fouled again.
To maintain the cruising/planning on the way back home I had to do 3100rpm, fully retracted trim tabs and +1+2 degree drive trim OR 3000rpm, 1/4 1/2 trim tabs and 0 degree drive trim.
IMO doing 3100rpm felt me better than the 3000rpm because the sound of engine/hull and rooster tail was flat and away from stern as a clean hull. But When I did 3000rpm and before applying tabs and keeping leg at 0 degree, a little bow high like need to hit throttle a bit more and rooster tail was in the mid of stern and it's place where to be normally.
Doing two scenarios gave me the same speed but I preffered the 3100Rpm and respective tab/leg settings.
Here comes the magic question.
Which case of scenario gives me the best/better fuel economy while hull/gear is fouled or clean but loaded since I don't have a onboard computer or fuel flow meter.
I know that less drag (properly trimmed hull) but high rpm should be the better.
Let me know what other (especially 280DA owners) members thinks and suggest.
Thanks in advance.
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