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Author Topic:   montauk/motor/mpg?

alvispollard posted 03-23-2001 07:30 AM ET (US)
What mpg will a 8 hp 4 stroke get on a montauk in calm water? 100 hp 2 stroke? Any source for this info. appreciated. Determining how far out I can go and troll for half a day on 28 gal. tank. Assume a loaded boat (1400 lbs.).
Clark Roberts posted 03-23-2001 10:36 AM ET (US)
Alvis, suggest you run your own tests as engines, set-ups, etc can greatly influence MPG. I use a measured two gal container and run a known measured course (can find on most charts , like the 5 mile ticks)... Make several tests and average out... You certainly need to know your range... most boaters don't! Happy Whalin'.. Clark .. Spruce Creek Navy
andygere posted 03-23-2001 11:35 AM ET (US)
I've often wondered the same thing. I plan to do a test run this summer, using my GPS to accurately monitor speed and distance. The big variable is sea and wind conditions, but it would still be nice to know what the fuel economy is under "average" conditions, whatever they are.
Hank posted 03-25-2001 12:11 AM ET (US)
When you do your testing be aware that fuel usage is sensitive to engine RPM. For example, cruising at 3000 RPM will give different values of miles per gallon than cruising at or near WOT or at speeds just below planing speed. You'll probably find that usage in GALLONS PER HOUR is pretty much proportional to RPM. Note: that's gallons per hour, not miles per gallon.
I suggest you do your test runs at fixed RPM.
Run a measured course, as Clark suggests but run at a fixed RPM. Say your consumption is 5 gallons per hour at 3500 RPM. You know that you've got 27/5 hours from your 27 gal. tank.
Your engine doesn't care if the current is against you or with you or the boat has two people or one person in it. As long as it's running at 3500 RPM it will use about the same number of gallons per hour. It won't go at the same speed under these different conditions but it will use about the same number of gallons per hour.
If you run a few points at different RPM's you will get a good picture of your range in hours. That will tell you when to go home.
Hank

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Author	Topic: montauk/motor/mpg?
alvispollard	posted 03-23-2001 07:30 AM ET (US) What mpg will a 8 hp 4 stroke get on a montauk in calm water? 100 hp 2 stroke? Any source for this info. appreciated. Determining how far out I can go and troll for half a day on 28 gal. tank. Assume a loaded boat (1400 lbs.).
Clark Roberts	posted 03-23-2001 10:36 AM ET (US) Alvis, suggest you run your own tests as engines, set-ups, etc can greatly influence MPG. I use a measured two gal container and run a known measured course (can find on most charts , like the 5 mile ticks)... Make several tests and average out... You certainly need to know your range... most boaters don't! Happy Whalin'.. Clark .. Spruce Creek Navy
andygere	posted 03-23-2001 11:35 AM ET (US) I've often wondered the same thing. I plan to do a test run this summer, using my GPS to accurately monitor speed and distance. The big variable is sea and wind conditions, but it would still be nice to know what the fuel economy is under "average" conditions, whatever they are.
Hank	posted 03-25-2001 12:11 AM ET (US) When you do your testing be aware that fuel usage is sensitive to engine RPM. For example, cruising at 3000 RPM will give different values of miles per gallon than cruising at or near WOT or at speeds just below planing speed. You'll probably find that usage in GALLONS PER HOUR is pretty much proportional to RPM. Note: that's gallons per hour, not miles per gallon. I suggest you do your test runs at fixed RPM. Run a measured course, as Clark suggests but run at a fixed RPM. Say your consumption is 5 gallons per hour at 3500 RPM. You know that you've got 27/5 hours from your 27 gal. tank. Your engine doesn't care if the current is against you or with you or the boat has two people or one person in it. As long as it's running at 3500 RPM it will use about the same number of gallons per hour. It won't go at the same speed under these different conditions but it will use about the same number of gallons per hour. If you run a few points at different RPM's you will get a good picture of your range in hours. That will tell you when to go home. Hank