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Author Topic:   Top speed stability and handling Montauk
Kelly posted 05-05-2001 08:03 AM ET (US)   Profile for Kelly   Send Email to Kelly  
There have been several discussions about the best motors for Montauks and achievable top speeds. I have a son that will be using the Montauk, probably as a teenager, during the life of the motor, and what I want to know is, how does the boat handle at top speed with the 90 as opposed to the 70 (probably Yamaha or Tohatsu)? Or in other words, does the extra 20hp make the boat noticeably less stable at top speed. Also,is there a speed for this hull that anyone feels is optimum or possibly just too fast.

I know what your thinking, the boat can be dangerous with a 5 if not used safely and I agree. But I also recognize that no matter how much we discuss and practice safe boat operation, there are going to be times when he goes full throttle.

Dick E posted 05-05-2001 09:15 AM ET (US)     Profile for Dick E  Send Email to Dick E     
Kelly I have a Montauk with a 90 hp Merc.
WOT can get a little squirelly. Especially if you trim it out.
This is where a would feel uncomfortable with a unexperinced teenager at the helm.
Your top speed will about 4-5 mph less.

Get the 70 hp and rest a little easier.
I think high 30's is optimum speed for the Montauk

Also, if it was my son I would make mine take a safe boating course before he goes solo.

Cruiser posted 05-05-2001 09:55 AM ET (US)     Profile for Cruiser    
There is a guy in my area who has a mid 90's 115 Evinrude he is trying to sell. I was thinking of putting it on my Montauk (I know, it's rated for a 100). What kind of speed would this produce?
OutrageMan posted 05-05-2001 11:05 AM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
First to Cruiser...

I think it would be irresponsible speed (see below for results w/90). Also, the second you over-power a boat, no insurance company will back you should you have an accident, and every accident will be your fault in the eyes of them.

Second to Kelly...

One of the first power boats I ever operated solo was a montauk with a 90 Johnson on it. I was only allowed to after: several seasons of soloing a sunfish, being well instructed by my father (and proving to him I was competent {still working on that}), and taking the power squardron couse with him. I think I was 14-15 the first time I ran it by myself.

Now to the power...

That 90 really moved that boat. To the point where I believe that the hull was being over taxed at some times. At about 90% throttle the chine walk started, and the steering became squirlly and very sensitive. If memory serves, with my father and I in the boat, speeds of 52 were possible. Way too fast for that type of boat, espically if a beginning boater were at the helm.

Now currently my father has a different Montauk with a 70 Evinrude on it. I believe that is a much better choice. For those that may think that is too little power, I beg to differ. This past fall, the two of us used this boat for duck hunting. With both of us (I weigh 225, and he is about 180) two shotguns, a couple of boxes of shells, about 25 Herters decoys with lead weights, full fuel, and of course all of the ducks that didn't make the "catch and release", the boat still made 40, and performed very well. Not to mention the improved fuel ecomony.

The point of the story?

90 is on the edge of being too much
115 is insane
70 is a great choice

Oh yea, make sure you do cool stuff with your dad, you'll never forget it.


Kelly posted 05-05-2001 01:58 PM ET (US)     Profile for Kelly  Send Email to Kelly     
These are exactly the kind of responses I was looking for. Looks like I'll have a little more left over for electronics and gear. Kelly
daverdla posted 05-05-2001 03:21 PM ET (US)     Profile for daverdla  Send Email to daverdla     
I have a 89 montauk w/ 100HP evinrude. The gentleman I bought it from was very concerned about the speed. He told me that he was very uncomfortable letting his teenage children use the boat.

I posted this question earlier and did not get a response. Why does my boat lean to port at WOT. It has doel fins. That appear to be warped in such a way as to cause the boat to lean. Could it be something else? Torque? I plan to make some test runs without the fins. If it levels out, I put new ones on.

OutrageMan posted 05-05-2001 04:28 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     

My guess is that it has more to do with torque, although the bent fins could be the problem.

I have a 22' Outrage with whaler drive. The boat is running a 250 Yamaha. It too would have torque list, but at even about 4000 rpm. Generally torque list goes to port.

There are a few solutions...

1) Counter rotating twins

Or what I did...

2) Install a Stingray Hydrofoil on the cavatation plate.

I opted for the $30 solution, and have never looked back. People here sing the priases of the Doel fin, but the Stingray worked for me.

It allowed me to use the full range of the trim, and I am able to trim out the list that the fin does not naturally help with.

Good luck,

Whalerdan posted 05-07-2001 10:50 AM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     
I have a 85 Montauk with a Evinrude 115 on it and it is probably too fast. I wouldn't feel comfortable letting a young kid use it thats for sure. The motor runs too good to replace it at this point but when the time comes I think I would go with a 90hp. We do alot of wake boarding with 4-5 guys on onboard and, while a 70 might do well with a light load, I think I'd need the extra hp to for these occasions.

andygere posted 05-07-2001 02:12 PM ET (US)     Profile for andygere  Send Email to andygere     
I have a '79 Montauk with a '79 85 hp Johnson. With a full load of fuel, 2 people, fishing gear, a 15 h.p. kicker and dual batteries, the boat does 39 mph on smooth water. Handling of the boat was fine at this speed, but I wouldn't want to go much faster. I suspect the age of my engine and the extra weight carried contribute to the slightly lower speeds than others report with similar power. On the other hand, with 6 adults on board in choppy conditions, the boat planed out quickly, and didn't lug the engine. Overall, I think the 85-90 hp is the ideal engine if you carry more than 2 people and any amount of gear. You can always prop the engine to limit top end, but still have the power needed to carry heavy loads or pull skiers.

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