bbwhitejr
Well-Known Member
The key to me would be to know that the boat performs within specs. If not, then something is wrong.....
Bennett
Bennett
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
It didn't like much trim at cruise but at full throttle I could add a decent amount.
I can decrease fuel burn rate by 1.5 to 2 gph just by adjusting the drive trim. Since a decrease in consumption is caused by a drop in load, it would add a few mph to the top end. So drive trim may be a factor. Lately we have had some fairly wide tide swings creating some strong tide currents. That could account for 2-3 mph depending when and where you were going.
Henry
Sent from my iPad using Tapatalk HD
I upgraded the dash to SmartCraft, including a SystemView display. There is a page in the SystemView that shows the current burn rate. I just adjust the drive trim to find the lowest burn number.
I'm not concerned with mpg numbers because there are too many variables that influence mpg.
Henry
Sent from my iPad using Tapatalk HD
I'm going to make a trip from point A to point B, my twin 5.0's burn 20gph at cruise.....will I make it?I upgraded the dash to SmartCraft, including a SystemView display. There is a page in the SystemView that shows the current burn rate. I just adjust the drive trim to find the lowest burn number.
I'm not concerned with mpg numbers because there are too many variables that influence mpg.
Henry
Sent from my iPad using Tapatalk HD
From some 2005 SR literature I have for T5.0MPI, B3, 2.2 ratio, props 24P.....WOT45-49mph, WOT 5,000rpm.That's a good measure. I would be curious what the intended specs are. Seems as though there is consistent reports that the boat should top out in the mid to upper 40's.
I'm going to make a trip from point A to point B, my twin 5.0's burn 20gph at cruise.....will I make it?
Certainly all those things are factors, I agree and probably more so with gas power. To have an idea of your boats performance using any criteria is useful, including mpg. It's interesting that your first question was asking for distance between points.Distance between A and B? Headwind? Tailwind? Cross current? Sea state? Fuel level?
Historical mpg is meaningless for navigation.
The only time mpg means anything is at the moment, and with the specific conditions when you are setting up the navigation for your course. You can be on plane burning 20 gph fighting a combination of headwind, current and waves with a SOG half of your normal cruise speed. In that case your mpg is also half of your normal cruise mpg. So in that case if you make fuel consumption assumptions based on historical numbers you will be wrong.
Henry
Sent from my iPad using Tapatalk HD
Just wanted to update. Took the boat out today. Perfect day...little wind and seas were like glass. Had my wife, my dog and my tender on the back and 3/4 tank of fuel and full water tank. Pushed the throttle wide open. Once on plane I started to trim up. Could instantly see a difference in speed. Trimmed enough to see 42 mph and RPms at around 5000. I think with a lighter load and little more trim I could see mid 40's...maybe more.
quesrion about ventilation- how do I know if I have trimmed enough or too much? Does trim come into play at any speed or only at top speed. I have never really used the trim...only the tabs. But if I am understanding how trim works I should be able to trim at my cruising speed and decrease rpm this increasing efficiency? Am I right on that?