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Author Topic:   Montauk range

DeepSouthWhaler posted 10-03-2004 03:23 PM ET (US)
What would the estimated range of a 1986 Montauk with a 1993 90 Mercury, 2- 12 gallon fuel tanks, 2 batteries and 4 persons aboard?
newt posted 10-04-2004 07:58 AM ET (US)
Should be around 100 miles or more if you cruise around at 30 mph or less. Obviously, if you run around at WOT or plow around at 10 mph, your milage will be less.
jimh posted 10-04-2004 08:43 AM ET (US)
I think 100-mile range is too optimistic. The engine will probably burn about 9-gallons-per-hour at wide-open-throttle (WOT), with a speed of about 30-MPH. With only 24-gallons aboard, and figuring only 90-percent of that useful, you have 21.6 gallons to burn. That is only 2.4 hours of running. At 30-MPH you will only have a range of about 72 miles. If you hit 35-MPH at WOT you may go about 84 miles.
If you find the engine's sweet spot for fuel economy, you might stretch that a bit. I would not plan trips with 100-mile stretches and no extra fuel.
alvispollard posted 10-04-2004 09:02 AM ET (US)
4-5 mpg depending on rpms, waves, motor tuneup. With 4 people you are probably overweight and that is a factor also. Safe but still a factor in gas consumption. Figure on 75-80 mile range to not cut it close.
home Aside posted 10-04-2004 12:07 PM ET (US)
During the BWGLCC North Channel Rendezvous I was getting around 55 Miles on a 12 gallon tank with my 1982 Montauk with 1982 Evinrude 90. Speeds and conditions varied from Approaching wide open throttle to cruising through extended No Wake zones.
I had my two 12 gallon tanks and carried an extra 6 gallon gerry can on board just in case.
Pat
home Aside posted 10-04-2004 12:10 PM ET (US)
I left out that I was alone in the boat, but It was my first extended cruise and I carried a lot of weight, having overpacked and taken much more equipment etc than I needed....I admit though that I did like the way the boat handled with the extra weight....
Pat
TexasWhaler posted 10-04-2004 01:59 PM ET (US)
Any guesses on a Montauk with a 3-cylinder Johnson 70 and a 27 gallon tank?
I'm thinking possibly Cuba.
newt posted 10-04-2004 04:47 PM ET (US)
Jimh, WOT is over 40 mph on his boat. At 30 mph, he should be burning less than 9 gph.
I know that one day in a 1984 Montauk with a 2003 Mercury 90 hp 2-stroke, two batteries, 3 adults, full cooler, and other gear I logged 46 miles and still had a gallon or two left in the 12-gallon tank. So, from my experience, 24 gallons of fuel will get you farther than 100 miles.
But, what is the definition of "range"? Is it the maximum distance you can go, or the maximum distance you should plan on going and still have a factor of safety?
wwknapp posted 10-04-2004 05:24 PM ET (US)
Not one of those gashog 90's, but I got 40 miles from 5 gallons over the weekend on my Montauk. Three people. Got even better coming back, but did not refill the tank yet. Outbound we filled the tank at the far end so I know exactly what it took. I had a 2.5 gallon reserve can, but decided to not have to worry about gas no matter what we did.
That gives me 80 miles plus for the two 6 gallon tanks. With some left over. Engine is a Yamaha 50 4-stroke. Cruise speed is more like 20mph. Not near as easy on the gas at WOT. I'd probably only get 60 miles if I did it WOT, maybe less.
David Livingstone posted 10-04-2004 10:44 PM ET (US)
Deepsouth, the best way to determine your range is gained by experince. Use a GPS for distance/speed and record your RPMs. If you have time, take a number of 10-20 mile runs in different sea conditions and do your calculations. The most important thing to remember is the 1/3 rule. The 1/3 rule is to have 1/3 of your fuel for the trip out, 1/3 for the trip home and 1/3 still in your tank when you get home. The reason for this is that you may be faced with heading into large head seas on the way home and when forced to plow along at 7-11 mph you'll find that you'll go through that extra fuel pretty quick.
All the Best,
David
DeepSouthWhaler posted 10-05-2004 09:41 AM ET (US)
Thank you gentlemen for your replies. I am planning to venture further out than usual to try new fishing spots. My usual trips have been close by and fuel was never a problem. This trip is estimated to be around 80 miles. (40 miles down river/ 40 miles back up) I may bring a spare 6 gallon tank for insurance. During this long run , I will try to determine the MPG and/or the GPH of this boat.
Buckda posted 10-05-2004 09:48 AM ET (US)
Keep in mind that at any speed, your trip downriver will burn fuel more efficiently than your trip back upriver....this will vary with the speeds of the current.
Dave
wwknapp posted 10-06-2004 12:48 AM ET (US)
If you are doing this in a river there are probably places along the way you can get gas if you have not got the numbers right. Find out where they are beforehand. I certainly agree, downriver for the first half is going to give a big false sense of security. Much more gas will be used going back up.
Note there are so many variables no single run will give you a figure that's good for all trips. Keep track over lots of trips.
Landlocked posted 10-07-2004 01:19 PM ET (US)
Obviously your mileage downriver will be much better than it will be upstream, Keep that in mind.
As far as average mileage, I get 4.5 miles per gallon at a comfortable cruise out of my Montauk/Mercury 90 2stroke combo. I'll define comfortable at somewhere in the mid 20's. All things being equal during your trip, (wind/current etc) you can expect UP TO (emphasis added) 108 miles. I would figure on 80 and carry extra gas accordingly.
For me on a normal trip, I always head upstream from the ramp. I know its time to turn around when the first tank is almost empty.
Ll.

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Author	Topic: Montauk range
DeepSouthWhaler	posted 10-03-2004 03:23 PM ET (US) What would the estimated range of a 1986 Montauk with a 1993 90 Mercury, 2- 12 gallon fuel tanks, 2 batteries and 4 persons aboard?
newt	posted 10-04-2004 07:58 AM ET (US) Should be around 100 miles or more if you cruise around at 30 mph or less. Obviously, if you run around at WOT or plow around at 10 mph, your milage will be less.
jimh	posted 10-04-2004 08:43 AM ET (US) I think 100-mile range is too optimistic. The engine will probably burn about 9-gallons-per-hour at wide-open-throttle (WOT), with a speed of about 30-MPH. With only 24-gallons aboard, and figuring only 90-percent of that useful, you have 21.6 gallons to burn. That is only 2.4 hours of running. At 30-MPH you will only have a range of about 72 miles. If you hit 35-MPH at WOT you may go about 84 miles. If you find the engine's sweet spot for fuel economy, you might stretch that a bit. I would not plan trips with 100-mile stretches and no extra fuel.
alvispollard	posted 10-04-2004 09:02 AM ET (US) 4-5 mpg depending on rpms, waves, motor tuneup. With 4 people you are probably overweight and that is a factor also. Safe but still a factor in gas consumption. Figure on 75-80 mile range to not cut it close.
home Aside	posted 10-04-2004 12:07 PM ET (US) During the BWGLCC North Channel Rendezvous I was getting around 55 Miles on a 12 gallon tank with my 1982 Montauk with 1982 Evinrude 90. Speeds and conditions varied from Approaching wide open throttle to cruising through extended No Wake zones. I had my two 12 gallon tanks and carried an extra 6 gallon gerry can on board just in case. Pat
home Aside	posted 10-04-2004 12:10 PM ET (US) I left out that I was alone in the boat, but It was my first extended cruise and I carried a lot of weight, having overpacked and taken much more equipment etc than I needed....I admit though that I did like the way the boat handled with the extra weight.... Pat
TexasWhaler	posted 10-04-2004 01:59 PM ET (US) Any guesses on a Montauk with a 3-cylinder Johnson 70 and a 27 gallon tank? I'm thinking possibly Cuba.
newt	posted 10-04-2004 04:47 PM ET (US) Jimh, WOT is over 40 mph on his boat. At 30 mph, he should be burning less than 9 gph. I know that one day in a 1984 Montauk with a 2003 Mercury 90 hp 2-stroke, two batteries, 3 adults, full cooler, and other gear I logged 46 miles and still had a gallon or two left in the 12-gallon tank. So, from my experience, 24 gallons of fuel will get you farther than 100 miles. But, what is the definition of "range"? Is it the maximum distance you can go, or the maximum distance you should plan on going and still have a factor of safety?
wwknapp	posted 10-04-2004 05:24 PM ET (US) Not one of those gashog 90's, but I got 40 miles from 5 gallons over the weekend on my Montauk. Three people. Got even better coming back, but did not refill the tank yet. Outbound we filled the tank at the far end so I know exactly what it took. I had a 2.5 gallon reserve can, but decided to not have to worry about gas no matter what we did. That gives me 80 miles plus for the two 6 gallon tanks. With some left over. Engine is a Yamaha 50 4-stroke. Cruise speed is more like 20mph. Not near as easy on the gas at WOT. I'd probably only get 60 miles if I did it WOT, maybe less.
David Livingstone	posted 10-04-2004 10:44 PM ET (US) Deepsouth, the best way to determine your range is gained by experince. Use a GPS for distance/speed and record your RPMs. If you have time, take a number of 10-20 mile runs in different sea conditions and do your calculations. The most important thing to remember is the 1/3 rule. The 1/3 rule is to have 1/3 of your fuel for the trip out, 1/3 for the trip home and 1/3 still in your tank when you get home. The reason for this is that you may be faced with heading into large head seas on the way home and when forced to plow along at 7-11 mph you'll find that you'll go through that extra fuel pretty quick. All the Best, David
DeepSouthWhaler	posted 10-05-2004 09:41 AM ET (US) Thank you gentlemen for your replies. I am planning to venture further out than usual to try new fishing spots. My usual trips have been close by and fuel was never a problem. This trip is estimated to be around 80 miles. (40 miles down river/ 40 miles back up) I may bring a spare 6 gallon tank for insurance. During this long run , I will try to determine the MPG and/or the GPH of this boat.
Buckda	posted 10-05-2004 09:48 AM ET (US) Keep in mind that at any speed, your trip downriver will burn fuel more efficiently than your trip back upriver....this will vary with the speeds of the current. Dave
wwknapp	posted 10-06-2004 12:48 AM ET (US) If you are doing this in a river there are probably places along the way you can get gas if you have not got the numbers right. Find out where they are beforehand. I certainly agree, downriver for the first half is going to give a big false sense of security. Much more gas will be used going back up. Note there are so many variables no single run will give you a figure that's good for all trips. Keep track over lots of trips.
Landlocked	posted 10-07-2004 01:19 PM ET (US) Obviously your mileage downriver will be much better than it will be upstream, Keep that in mind. As far as average mileage, I get 4.5 miles per gallon at a comfortable cruise out of my Montauk/Mercury 90 2stroke combo. I'll define comfortable at somewhere in the mid 20's. All things being equal during your trip, (wind/current etc) you can expect UP TO (emphasis added) 108 miles. I would figure on 80 and carry extra gas accordingly. For me on a normal trip, I always head upstream from the ramp. I know its time to turn around when the first tank is almost empty. Ll.