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Montauk Speed
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| bmw90w |
Posted on 08/05/10 - 1:33 PM
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Since everyone was posting their speed, i figured I would check mine out on the GPS. I am 36-38 with me and my buddy. This is with just 12 gallons and minimal gear. The motor is a 96 Mercury 90.. I figured I should be in the 40s from what I was reading earlier. My RPMS are at 3500 or so, bu I think the tach is on the wrong setting. The mechanic looked and said the prop should be fine. Before I changed the tach, I was right at 5000 rpms, so I think the tach is just reading wrong. Either way, should I be in the40s, or am I okay? From what I can tell, water in the hull should not be an issue.
1984 Montauk |
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| beenfishin |
Posted on 08/05/10 - 2:00 PM
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I have an '87 Montauk w/ '87 Merc 90hp and was running 38 mph in a small chop yesterday. Also had a 12 gallon tank, single battery, 9.9hp kicker motor, and one buddy in the boat. Don't have a tach so not sure what the RPM's are running. Seems we have pretty comparable rigs, with comparable results. I think w/ glass flat water she'll run a 40.
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| Paulsv |
Posted on 08/06/10 - 7:04 AM
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I got 39 mph on the GPS at 5400 rpm the other day in a light chop with 4 people, 20 gallons of fuel and a 6HP kicker on board. I got the last 1 or 2 MPH by playing with the tilt trim. I have a 76 Montauk with a 1995 Johnson 90. I'm not sure what the prop is- it as an aluminum prop I got with the boat.
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| dcalvano |
Posted on 08/08/10 - 7:24 AM
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My 1982 Montauk with a 90hp Mariner was maxed out at 42.3 mph 36-39 with extra people..
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| Tom W Clark |
Posted on 08/08/10 - 9:07 AM
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36 to 38 MH is way too slow and indicates something is wrong. That boat/motor combination should do 40 to 44 MPH depending on how it is rigged.
What details can you offer? Motor mounting height? prop? Bottom paint? Hull weight? Accessories installed? Typical conditions?
If you formerly were hitting 5000 RPM and now only 3500 RPM, then the motor is not firing on all cylinders or something more sinister is happening.
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| Eastflorida |
Posted on 08/10/10 - 1:54 PM
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My 2010 170MT goes over 42 mph... 90 4stk
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| huntingturkey2 |
Posted on 09/07/10 - 6:40 PM
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I have a Johnson Gt 100 V4 and maxed out at 58 mph (according to GPS) while riding by myself.
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| Guts |
Posted on 09/07/10 - 8:12 PM
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single person down hill with a (2000 year) Suzuki DF 70 14x19 pitch cupped GPS speed 36mph
Guts/AKA/Kim |
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| joninnj |
Posted on 09/07/10 - 8:14 PM
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I have seen 42 MPH per a GPS at 5100 RPM with a 19K series SS Yamie prop. Mounted flush on the transom
Someone above this post said 58 MPH... WOW... My 17 would blow over backwards in a light gust at that speed...:-)
Edited by joninnj on 09/07/10 - 8:18 PM
Jon in NJ
Many other boats and outboards in my boating history
The Whaler is the one I like the best!!! |
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| Tom W Clark |
Posted on 09/07/10 - 8:42 PM
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58 mph with a Johnson GT 100 V4 on a Montauk is total BS.
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| Barryg |
Posted on 09/08/10 - 2:53 AM
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huntingturkey2 wrote:
I have a Johnson Gt 100 V4 and maxed out at 58 mph (according to GPS) while riding by myself.
Must of been riding down hill with GUts LOL
1972 Cohassett 115 Yamaha 50 mph flat calm. BG
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| Guts |
Posted on 09/08/10 - 6:21 AM
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Barryg wrote:
huntingturkey2 wrote:
I have a Johnson Gt 100 V4 and maxed out at 58 mph (according to GPS) while riding by myself.
Must of been riding down hill with GUts LOL
1972 Cohassett 115 Yamaha 50 mph flat calm. BG
For those of you that don't know what I meet by ("down hill" ) This term is used here on the left coast with the swell behind you giving you a push. And up hill would be just the opposite headed into the swell, Wind is also a factor, which I had had at my back when I took this speed reading. I'm not trying to be rude, I'm posting this because some people never get on the ocean and are unfamiliar with this term. Reporting there speed on flat water in a lake or something like that. So my reported speed (36 mph) would not be the same on flat water.
Edited by Guts on 09/08/10 - 6:27 AM
Guts/AKA/Kim |
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| hc803 |
Posted on 09/08/10 - 6:39 AM
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I got mine up to 65 this morning... pulling it on the trailer.
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| tommy mc |
Posted on 09/08/10 - 8:05 AM
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hc...thats a good one
'87 17 mtk w '95 115 evinrude gps'd at 43 at 5200 rpm
me and another, 20 gallons and 2 batteries in a light chop on the bay
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| Sisslechest |
Posted on 09/08/10 - 9:30 AM
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89 Newport with a 2005 ETEC 75HP, 38MPH at 5,000 RPM. 12 gals gas minimal load.
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| Jeff |
Posted on 09/08/10 - 11:21 AM
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Agreed on the 58mph being impossible with a GT 100. We only saw 48 on our Montauk with a Inline 6 Mariner (Mercury) tower of power which was know for it's strong, if not underrated horsepower ratings. Granted we were only turning an aluminum prop but there is no way we would have seen 10 more MPH.
On this past Monday I was finally able to log a full set of numbers on the 1976 17' Newport and the 1974 85hp Evinrude Starflite turning the OMC SST 13 3/8" x 17. Motor is mounted all the way down.
The air temps were in the low 70's and so where the water temps. Water conditions were a light chop and slight breeze. Boat had 16 - 17 Gallons of fuel.
2000: 8.5mph
2500: 13.8mph
3000: 20.5mph
3500: 25.6mph
4000: 30.8mph
4500: 34.7mph
5000: 38.4mph
5175: 40.3mph (WOT trimmed all the way out)
After seeing others numbers I am over the moon happy that my 36 year 85Hp powerhead (not prop) rated motor performs like it does.
Edited by Jeff on 09/08/10 - 11:24 AM
1993 23' Walkaround Whaler Drive |
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| Joe Kriz |
Posted on 09/08/10 - 11:27 AM
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GPS speed does not actually give us SOW, Speed Over Water unless there is absolutely no wind and no current.
GPS gives us SOG, Speed Over Ground.
If our boat is doing 48 mph over the water and we have a 10 mph down wind speed or current, then the GPS display will tell us we are going over the ground at 58 mph.
To get the SOW accurate, we need to turn the boat around 180ยบ and run the same test going upwind or up current and then average the two speeds.
In this example, going 48 mph over the water and into the 10 mph wind or current, the GPS display our SOG would be 38 mph.
So, GPS one way says we are going 58 mph over the ground.
GPS the other way says we are going 38 mph over the ground.
Average boat SOG, Speed Over Ground is 48 mph...
This gives us our boat Speed Over Water and the top speed our boat can do if we were running this test at WOT, Wide Open Throttle both ways...
So, to be accurate, you absolutely need to run your speed test in both directions and average these speeds.
Otherwise, any test you do is NOT accurate and you could just be blowing in the wind so to speak.
Edited by Joe Kriz on 09/08/10 - 12:01 PM |
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| bw_poster |
Posted on 09/08/10 - 11:48 AM
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WOT on my 03' montauk 170 is 43mph, by myself, fishing package and pads, single battery with bimini down (e.g. minimal equip), minimal swell, no wind (early morning) on inshore ocean at 5400 rpm (merc 90hp 4-stroke), lightly trimmed up.
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| Nutty Squirrel |
Posted on 09/08/10 - 1:56 PM
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'81 Montauk with 1998 2 stroke 75 HP Merc. with gear. Does about 34 (with two 12 gallon tanks) but cruises very nicely at 25-28. I don't think I would want to go 45 in a Montauk on Puget sound.
Nutty Squirrel
1981 Montauk |
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| DownTonset |
Posted on 09/10/10 - 4:29 AM
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39.7 MPH (per GPS) @ 5300 RPM in glassy water with me, my girlfriend, and about 18 gallons of fuel on board. l'm sure the boat would do well over 40 if I could get it to run flat. These old V4 'Rudes pack some punch.
1984 Montauk--1984 Evinrude 90 |
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