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Montauk 150 performance Trim Tabs
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| EJO |
Posted on 08/14/14 - 7:45 AM
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Has anybody out there ever mounted so "self adjustable" trim tabs on their Montauk 150?
I'm thinking of installing a pair of Nauticus SX9510-40 in the hopes to get better out of the hole performance and get on to plane better with a full boat load (5/6 people). Nauticus said they have helped many customers put them on whaler boats over the years with much success. I believe they talk about the 17' and up models. You need 10" of height clearance from the bottom of the boat up where the actuator mounts and with my swim ladder that means it would be mounted just to the right of the ladder. i.e. close to center of the boat right next to the 60 HP where the different rise step is.
I don't want to buy these tabs and put mounting holes in my transom before I know it has been tried out on a Montauk 150.
Before somebody refers me to the 2009 and 2010 threads about why and why not to use these Smart tabs let me tell you I did read all of it but my concern is where to place them on my 15 ft. hull as I cannot do it on the outside of my transom due to where my factory mounted swim-ladder sits hence I need to know if somebody installed a set on a 150 Montauk hull.
I know it will help with porpoising and getting onto plane with less passenger shifting around.
Please show some transom pictures with mounted Smart Tabs.
E-J
[Moderator - edited text to change to model names. We do not use "15' hulls" as a descriptor since it is too vague.]
Edited by Phil T on 08/15/14 - 6:33 AM
Skipper E-J
m/v "Clumsy Cleat" a 2008 Montauk 150 |
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| Phil T |
Posted on 08/14/14 - 9:50 AM
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Asking a Montauk 150 with a Mercury 60 hp motor to plane quickly with 5-6 people is quite silly. It is not about tabs or fins. It is about horsepower and torque.
The 150 Montauk has a dry weight of 950 lbs. , this is the same weight of a classic Montauk 17). The maximum rated horsepower for this boat is only 60.
My classic Montauk was a dog to plane with 5 people and I had a properly rigged and propped 2 stroke 90hp motor.
Edited by Phil T on 08/14/14 - 9:57 AM |
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| EJO |
Posted on 08/15/14 - 5:49 AM
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Phil T wrote:
Asking a Montauk 150 with a Mercury 60 hp motor to plane quickly with 5-6 people is quite silly. It is not about tabs or fins. It is about horsepower and torque.
OK Phil you have a point (although she's a dog I've gotten her up to plane with 980 lbs of people plus my standard 100lbs of gear/drinks/food) I should have left the 5/6 people out of my comment.
Let's say just 4 people which is what we normally cruise as with either my 2 adult sons or another couple.
Even by myself I still think she's a dog and doesn't jump out of the water like a boat that size should. This is with the standard "stiletto" SS prop that comes with the Merc 60, which with trimming I can get to 58/5900 rpm and running @ 29.3 knts. but she porpoises at that speed.
I'm just wondering if anybody did the smart tabs on a 150 Montauk or 150 Sport and where they placed them on the transom as it should give me better performance/handling.
[Moderator edit - Removed "15" hull" reference, please stop be generic and cite model names.]
Edited by Phil T on 08/15/14 - 6:31 AM
Skipper E-J
m/v "Clumsy Cleat" a 2008 Montauk 150 |
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| thegage |
Posted on 08/15/14 - 6:10 AM
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What style of swim ladder do you have? Can you add a pic to your page?
John K.
John Kittredge
1991 16 SL - 2013 E-TEC 90 |
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| Phil T |
Posted on 08/15/14 - 6:28 AM
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Sure, Smart tabs can help. I have read reports from whaler owners who installed them and were pleased.
I would look at shifting weight forward to address porpoising. You are too light in the bow, heavy in the stern.
I would also look at the engine rigging. It may be your motor is too low. Whaler tends to be conservative on mounting height.
After the above, if you still want to add tabs, go for it.
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| gary0319 |
Posted on 08/15/14 - 10:43 AM
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I know my Dauntless 15 has a different hull configuration than you are questioning, but with same approx length, a dry weight of 850 lbs., and a 60 hp 2 stroke, my Dauntless jumps on plane in less than 4 seconds with 4 adults and gear.
I'm running a 12" x 11 pitch stainless Stiletto prop, cavitation plate is 1 1/2" above the keel line and have a Dole Fin installed. WOT GPS speed is just under 34mph at 5100 rpm. However, even with the added lift of the low pitch prop, and the fin, the boat is prone to porpoise with only two aboard in the helm seat. I normally run with the motor trimmed in most of the way.
1998 Dauntless 15 - 1998 Mercury 60 |
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| Silentpardner |
Posted on 08/15/14 - 11:34 AM
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OK...I have a dumb question, as usual. :)
Where do you people put 5-6 people on a 15' boat? With only 60 HP? I know your boat is rated to carry a bunch of people, that is not the question. 1080 lbs of people and gear, on a 15' boat? Even 4 adult people on a 15' boat with any kind of gear at all won't happen with me as a captain.
You don't need trim tabs, you need a pontoon boat. JMHO.
Edited by Silentpardner on 08/15/14 - 11:39 AM |
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| gary0319 |
Posted on 08/15/14 - 3:08 PM
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Actually, 4 adults fit just fine in my 15' Dauntless. Folks have been carrying 4 adults for decades in 14 or 15 runabouts with 35 or 40 horsepower outboards. Just pick your days, watch the weather, and learn how to pilot responsibly.
1998 Dauntless 15 - 1998 Mercury 60 |
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| EJO |
Posted on 08/18/14 - 6:23 AM
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You are right Gary 4 people is no problem on my Montauk 150, and even though I take this boat on Lake Michigan (weather permitting) it is more designed for inland lakes. Also the 6 person plate rated at 960 is a little light as I per the capacity plate couldn't have 4 of me on board. Hell as a captain I won't take an 18" Outrage 15 miles off shore to go fishing with only 2 or three people.
I use an old 14' Achilles commercial "dive" boat with 25HP 2S when I want to move 8 people no matter how heavy they are and if some friend wants to go salmon fishing out 20 miles I take the cabin cruiser and take every-bodies family too.
Skipper E-J
m/v "Clumsy Cleat" a 2008 Montauk 150 |
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| EJO |
Posted on 08/18/14 - 11:19 AM
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thegage wrote:
What style of swim ladder do you have? Can you add a pic to your page?
John K.
John sorry for the late response but hopefully these pictures will show the type of swim-ladder I have on my Montauk 150 I had to do some down & up loading.
http://wilsonbrinker.com/ej/2008Monta...8-2014.jpg
http://wilsonbrinker.com/ej/2008Monta...8-2014.jpg
Skipper E-J
m/v "Clumsy Cleat" a 2008 Montauk 150 |
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| thegage |
Posted on 08/18/14 - 12:59 PM
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Ah, I see the problem, you can't clearance the metal ladder rung to get the Smart Tab piston to fit under it. What about using some wooden blocks/metal brackets to stand the ladder off of the stern?
John K.
John Kittredge
1991 16 SL - 2013 E-TEC 90 |
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| EJO |
Posted on 08/18/14 - 1:08 PM
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John,
Yea I probably have to but the Admiral won't let me as she thinks the boat runs fine. I'll make a decision this weekend after I take a loom what my friend did and measure his setup.
Skipper E-J
m/v "Clumsy Cleat" a 2008 Montauk 150 |
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| gary0319 |
Posted on 08/18/14 - 5:49 PM
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E-J,
Do you know what prop you are running. Maybe a lower pitch/ larger diameter prop would help with the porpoising. It looks Luke your motot is mounted in the center holes, so maybe another hole up might help with the top end. Others with more prop tuning skills might chime in on this, but swapping out my Old aluminum Merc prop for the much larger diameter stainless Stiletto made a world of difference.
Just a thought.....
BTW, I'm interested in how this turns ou since the 60 Merc Big Foot is on my short list as possible repower for my 15 Dauntless.
Gary
1998 Dauntless 15 - 1998 Mercury 60 |
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| Phil T |
Posted on 08/19/14 - 5:13 AM
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If the ladder is in the way, just move it up.
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| gary0319 |
Posted on 08/19/14 - 6:40 AM
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Phil T wrote:
If the ladder is in the way, just move it up.
Looks to me like the ladder might conflict with the trim tab when it's in the dropped down position.
1998 Dauntless 15 - 1998 Mercury 60 |
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| gchuba |
Posted on 08/19/14 - 7:15 AM
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If you decide to go with the trim tabs and the ladder becomes an engineering issue, I installed a Platismo safety ladder would attach to the two uprights for the walk through of you stainless rails. Removable when not in use.
Garris
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| EJO |
Posted on 08/19/14 - 11:13 AM
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That is a good point Garris but as mentioned B-4 a tough sales job. This is our "shallow" water inland lake cruising boat and the Admiral & I have to be able to get out of the water easy as we are getting older.
Gary as I think I mentioned B-4 my WOT speed with perfect trim is very acceptable with my Vengeance 48-17314 (13-3/8"x 14) all Stainless prop at a speed of 29.3 knots (33.7 mph) with 450 lbs extra weight on board. This is with the bottom of my anti-cavity plate equal to the bottom of my transom (the Montauk is rounded not "V"ed so I can't call it a keel). With a lighter load (myself, 1 full 6.5 gallon tank, and no gear) I've been able to clock her at 34.6 mph and just not porpoise, not a safe speed for this boat as your trim must be precise and the water like glass. Just add an other person and/or the gear and this 950lbs boat rides much better at a very acceptable top speed..
I'm not looking as much for speed as I'm looking for out of the hole speed (without getting a 2S 70 or 90 HP).
Also again smart trim tabs $110 + 1 hour install; or new SS prop $295 (cheap) with 1/2 hr install; or raise engine 1 hole (#2 from top) cost $0 and 2 hrs or more of work.
Prop install advantage would not be known to layman's eye as all looks the same but it has a high initial cost, raising engine trying to find a support that can handle my engine weight on a come-a-long/winch not easy, advantage low cost and again not known to layman's eye as all looks the same but also not known if it helps the hole shot. I currently trim all the way in to keep the boat from porpoising so for a minuscule higher top speed this a lot of work.
For those two reasons I like to do the in-expensive smart tabs that will work. With the dis-advantage of drilling holes in transom and it will get noticed, but the performance will be noticeably better and therefore an easier sale for the expence.
Garris do you have a link for the ladder?
Skipper E-J
m/v "Clumsy Cleat" a 2008 Montauk 150 |
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| gchuba |
Posted on 08/19/14 - 11:59 AM
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www.platismo.com is for the manufacturer. Plug in "platismo ladder" and you will get a lot of local sellers (it is a company in France which produces). I have the one that you can deploy from outside the boat and it stays in a sack on the gunnel between my rail walk through uprights.
Garris
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| Phil T |
Posted on 08/19/14 - 2:30 PM
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Try a swim platform or install a portable ladder.
Martin Marine makes top quality products specifically for Boston Whaler boats. Contact Ray and ask what he can offer for a Montauk 150. http://www.martinmarinedesign.comdesign.com
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| EJO |
Posted on 08/20/14 - 9:08 AM
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Thanks Garris and Phil I'll check it out.
Skipper E-J
m/v "Clumsy Cleat" a 2008 Montauk 150 |
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