Can this be correct?

Cool picture taken from inside AT&T park of the scoreboard with a raftup of Sea Rays on the big screen. Plan B is on the right side with me on the SP adjacent to "Talk to Chuck". A few in the group were a little excited?
 

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HUMPH said:
You obviously have not met my wife! Yes, 20 knots at 2400 RPM is normal so far for me. We were loaded up for a 2-week trip and always carry a good load. I do need to get the props scanned and adjusted and have a slight vibration on the port side since picking up a comforter on that side some months ago.
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Ken,
Your boat should run faster even loaded by your wife for 2 week trip.
My dad has 2001 410DA with 350hp 3126 Cats. He always run with full diesel and full water and campers on.
Once we were 10adults and 2 children in a 7Bft 2-2,5m wave head sea with full liquids and 5 baggages for 5 family and she did 22,5knots at 2250rpm and topped out 28,5knots at 2600ish rpm, . The antifouling was one month fresh that day(Easter 04/2011).
Last week again with a same load and liquids she did the same speed and my dad don't dive and clean the bottom/gear of his boat.
PS: He gets total 85 LPH average for 2 engine except running genny.
 
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Melida, do you know what props he runs? Mine are factory 22X23 and I want to have prop scans done to get them correct which seem to be 22X22 from what I have read here. I also may need to haul her to check the running gear but I don't think the cruise has changed since I have had the boat. I am in fresh water most of the time but saw no real difference running in salt water for the past couple of weeks. I barely hit 2600 RPM on the port side and less than that on the starboard so I do need prop tuning.
 
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HUMPH said:
Melida, do you know what props he runs? Mine are factory 22X24 and I want to have prop scans done to get them correct which seem to be 22X22 from what I have read here. I also may need to haul her to check the running gear but I don't think the cruise has changed since I have had the boat. I am in fresh water most of the time but saw no real difference running in salt water for the past couple of weeks. I barely hit 2600 RPM on the port side and less than that on the starboard so I do need prop tuning.
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Ken,

Actually I don't know what size props are fitted, asked dad and also he doesn't know. We bought it in 2007 and never changed the props and never needed to change, maybe they are factory props or po changed.

I have pics taken while lifted out but prop size can't be seen. The next haul out will be in april 2012 and before that date can't tell about it.

What I can tell is 410DA with 3126cats is a great combination for that size boat with lots of load carrying and economic.
 
Here are the numbers that I measured for my boat:
Fuel burn rate
RPM GPH MPH MPG
2000 6.5/13. 18.8. 1.44
2100 7.8/15.6 20.5. 1.31
2200 9.0/18. 22.1. 1.22
2300 10.5/21. 23.4. 1.12
2400 12/24. 24.9. 1.04
2500 14/28. 26.2. 0.94
2600 16/32. 27.4. 0.86
2700 18.8/37.6 28.8. 0.76
2800 21/42 29.8. 0.71

These were measured early this year. I did a prop tune last month and saw about a 1mph improvemment for each rpm step
 
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HUMPH said:
Melida, do you know what props he runs? Mine are factory 22X24 and I want to have prop scans done to get them correct which seem to be 22X22 from what I have read here. I also may need to haul her to check the running gear but I don't think the cruise has changed since I have had the boat. I am in fresh water most of the time but saw no real difference running in salt water for the past couple of weeks. I barely hit 2600 RPM on the port side and less than that on the starboard so I do need prop tuning.
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Ken,
This would be useless or late info for you, but my dad just hauled out his boat for annaul maintenance.
Called the captain and he told me that both props are 22x23.
So your 22x24s should/must do better than ours.
I'm not familiar with the 410DA if she is too much weight/load sensitive, but ours get 22,5 knots at 2250 rpm and your's gets 20knots at 2400rpm seems too much difference to me.
I guess it's time to prop scan your's.
 
Bridog said:
Ken, just saw this. Great videos! So, can you just take a tender in to see the games? Brian
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Yes you can take a tender. I may take my Caribe there some day.
 
melida said:
Ken,
This would be useless or late info for you, but my dad just hauled out his boat for annaul maintenance.
Called the captain and he told me that both props are 22x23.
So your 22x24s should/must do better than ours.
I'm not familiar with the 410DA if she is too much weight/load sensitive, but ours get 22,5 knots at 2250 rpm and your's gets 20knots at 2400rpm seems too much difference to me.
I guess it's time to prop scan your's.
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Sorry I missed your post Melida, I had 22" X 23" but now they are 22" X 21.454" and they go back on tomorrow AM!
 
HUMPH said:
Sorry I missed your post Melida, I had 22" X 23" but now they are 22" X 21.454" and they go back on tomorrow AM!
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NP Ken.
Good luck with your prop size.
Let me know the performance of your current size, then we can compare the results.
 
melida said:
NP Ken.
Good luck with your prop size.
Let me know the performance of your current size, then we can compare the results.
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Actually the size has not changed, just the pitch and the cup slightly. Thanks, I am taking her out this afternoon!
 
Ken:

Something is WAY off.

Just to recap, you say:
  1. you have the original 22 X 23 props
  2. you can't reach more than 2600 WOT RPMs
  3. you cruise at 20Knots at 2400RPMs
  4. you averaged 12.8 GPH over a 12 hour trip
  5. you are FULLY loaded
  6. you wrapped a comforter around your props and have a vibration.

Your average GPH numbers are inline with what I see....+/- 2gph....ON AVERAGE. Look at what Quality Time and Rondds are saying...they both have flo-scans on board. Their instaneous fuel flow is nowhere near their average GPH burn rate. That's a fact.

You say you can't get over 2600 WOT RPMs....is that reading from your factory analog tachs or digital/laser tachs? HUGE difference!

If you have 22 X 23 props and assuming your speed is read from accurate GPS then your tachs MUST be off or your boat is broke. The greater the pitch the great the speed at the same RPM. Something there is off kilter. I don't know what kind of cup your props have, but cup is a big factor in prop design and boat performance.

I've had my props worked a few times by a reputable prop scan shop till I finally dialed them in. I now have 22 X 22 with a custom cup....meaing the cup is variable from the tips down the legs of each blade. At 2400 RPMS I would be cruising at approximately 24 knots fully loaded. Generally I run 2325-2425 RPMs...all RPMs measured with Aetna digital tachs and speed by GPS. I "AVERAGE" 1.1 sMPG and burn an "AVERAGE" of approximately 12-14 GPH over time.

My guess would be that if you have your props turned down to 22 X 21.454 with little to no cup then your speed at cruise RPM is going to go down from where you are now while your WOT RPMs will go up....but you need to measure the RPMs accurately.
 
Before I sold the boat I was swinging the new 21x24's @ 2800++ WOT. Cruise speed was 24-25 knots @ 2400. Hopefully your tachs are wrong, but then again you just dialed your props down for nothing if they are.
 
After reading this thread, my 0.88MPG against a very heavy Columbia River current doesn't seem so bad with gassers!
Click to expand...

Agreed. What do you weigh (published dry weight)?
 
"My guess would be that if you have your props turned down to 22 X 21.454 with little to no cup then your speed at cruise RPM is going to go down from where you are now while your WOT RPMs will go up....but you need to measure the RPMs accurately."

I do have cup, it was just adjusted a bit. I do want to install digital tachs and will be checking my tachs against a hand held ASAP. They will tweak the props again if need be but I believe this is going work well based on the conversations with the propscan guy. Thanks for the input!
 
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