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The time is right for doing some homework in getting a stainless prop for my Offshore.
The hull will be my Classic 19 Outrage in the 1500 lbs weight range.
No Jack Plate but a fairly high motor emplacement.
http://www.whalercentral.com/userphot...oto_id=820
Note the added part to heighten the transom.
What will be your recommendations.

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It always makes me cringe when I see folks set heavy loads like boats and vehicles on concrete blocks. Its a very dangerous business.

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What is the gear ratio of the 1997 Mercury 150 Offshore?

What is the recommended WOT range of the 1997 Mercury 150 Offshore?

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Seems like it is a 1.87 to 1 ratio and 15 teeth.
If my memory serves me right WOT would be 5200 RPM.

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Serge - If it's a 2.5 liter with the 1.87 gearing, I would think an 18" or 19" Enertia prop would be about right. Redline is 5500.

I run a 19" Laser II on my 2.0 liter engine, but the Enertia is a more modern design and might be better. Your engine should also be faster.

I note that Whaler is using the Enertia on the new 190 Montauks, a boat with a hull bottom very similar to the old 19.

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With the 1.87:1 gear ratio and a 5500 redline, the 14" x 19" Laser II or 14-1/4" x 19" Stiletto Advantage is the prop for that boat.

The Enertia has a lot of blade area for a boat that light. It is not as good an application for that model.

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Good to see that we can all come together when important questions do come up.
I would guess that those props would be in the $500 range.?
Thanks for the good input guys.

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Johnny,
I did find your testimony touching.
Blocks were used by necessity and not by choice.
The setting is rock steady and stable.
I am not doing several refits per year
If you have a supply of stands and would share I am willing to pay shipping.
Thanks for your concerns.

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The Laser II or Enertia will be about $450, with hub kit.

The Stiletto Advantage 4.75 is about $250, with hub kit.

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This 14-1/4" x 19" Stiletto Advantage II is actually hubbed for a Mercury motor.

It's used, and it's the old style rubber hub but it is otherwise exactly the same propeller as a new Advantage 4.75

http://www.thehulltruth.com/parts-for...-prop.html

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Thanks for all that priceless info Guys
So much to do
So little time to do it all..

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I have a like-new Michigan 14 1/8 X 19 that I tested on my 18ft. Ventura with 3.0 litre 200 DFI.
3000 rpm.....28.7
3600 rpm.....36.8
4000 rpm.....40
5000 rpm.....49.4
5600 rpm.....55
All speeds gps
Flat water
water temp 62.4
bimini top up
2 passengers
13 gallons of fuel onboard
engine mounted 2 holes up
$275 without hub plus shipping
Recommend Flotorq III hub, though you can use Michigan's XHS hub system or any other Flotorq compatible aftermarket hub system.
The HighFive 19 I tested was not nearly as efficient, but it was the smoothest of all props I have tried.
Tempest Plus was by far the fastest, but it was not very smooth at mid-range. Once you have run a 5 blade HighFive
you will think everything else has a vibration :)

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I have been remiss in the fact that I did not mention that my outboard and leg bought as a unit is a counter clockwise rotation.
It does complicate things a bit as far as choices.
Me Bad.

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Well then, you can make good use of my counter rotation 14" x 21" Mercury Offshore (aka VenSura) four blade propeller I have for sale. I'll deliver it to Canada for $150.

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If that include shipping
I think that I am tempted.
How does it stack against the "ideal Stiletto 11 Prop?

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FYI, when someone says they will deliver something for a price, that means the shipping is included in the price.

If top speed is your ultimate goal, the Stiletto will be better but will cost twice as much.

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A 21" prop running through 1.87 gears is good for 55-56 MPH. I don't think a 19 Outrage will go that fast with a 150 on it. At least mine won't!

I would think a 19" pitch makes more sense.

Here are some good deals on LH Merc props. You may find something you can use here:

http://www.getaprop.com/content-categ...nless.html

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Hey!
I am more than game..
In our locale when someone say that they will deliver
It means that they will show in person.
Small differences but meaning to be in effect a friendly price.
I will be agreeable to buying the prop from you Tom.
Regular US postage would do.

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Big thanks to everyone
for helping and giving me hints for solving this small problem.
Thanks Guys.

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Larry -- Propellers are not generic pieces hardware. You cannot make speed predictions based on pitch alone without considering the model of propeller being discussed.

There is no way a 21" Offshore (VenSura) will run 55-56 MPH on a Mercury 150 with 1.87:1 gears and a 5500 RPM redline. The Offshore (VenSura) typically runs with 10-15 percent calculated slip so it ought to be good for about 50 MPH on Serge's boat...if it can go that fast. It may not. How fast is your Outrage 19 with it's 1988 Mercury 150?

Unfortunately, if the 21" Offshore (VenSura) is too much then the 19" Stiletto Advantage will be too much also as they will turn about the same RPM. The 19" Laser II *might* work because it allows more RPM than the Stiletto Advantage.

So, a 14-1/4" x 17" Stiletto Advantage or *maybe* a 19" Laser II. If the latter is too much pitch you cannot use a Laser II at all because Mercury does not make that model with less pitch and the Vengeance, which is made in the lower pitches, is not a great prop.

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Got a small update on this very interesting topic.
I have on loan been given two props to try and secure for my Merc.
1-Stainless 4 blade #48-825903A45-21P

2-Stainless 4 blade Offshore #48-825901A46-19P
From your records and experiences
What will be the come back on the better one?
I am told the the 21 will have a slower pick up but a better top end speed.
Top speed and economy will be as important as ever.
#2 what would be the factors involving my hull not making the 50MPH with this Merc 150?

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Tom and Serge

My Outrage 19, which is dry, clean bottom and all original, will run 46 MPH with the 19" Laser II, 44 MPH with either a 19" Vensura or Black Max 19" aluminum @5400 RPM. My 150 is the smaller 2.0 liter engine, so it is not as powerful as the later 2.5 150. These are Great lakes freshwater figures. On salt water, when the same engine was on the 21 Ribside, I was able to get 47 and 45 respectively, also with the 19" props.

But because of the different gearing, the 2.5 liter 150 will still only be able to run a 19" prop, although top speed may be closer to 50 MPH. I would say look for about 48-50 MPH.

I think this old hull is very similar to the new Montauk 190, in size, weight and bottom configuration. I note they use an Enertia prop, which is why it may be a better solution for this hull than the Laser II. I am going to give one a try on my own.

I did not like the Vensura prop on this boat, and definitely not the aluminum, which gave it a very hard ride, with no bow lift. The boat rides the best with the Laser II, but seems to lack blade area for lower planing speeds, and hence too much RPM.

I believe the jackplate setback, and subsequent higher running height, really improves the overall ride also.

Here is the boat for reference, for those readers not familiar with what we are talking about:

http://smg.photobucket.com/albums/v42...?start=all

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Thanks for the performance info on your boat Larry. That is very helpful.

Serge's 150 will be no faster than your 150, they are both 150 HP after all, so it looks like the Laser II is out of the picture at any rate.

To run 45 MPH with the 1.87:1 gearing, a 17"-ish prop is going to be needed. The 19" Offshore will probably get the RPM within range but if you say you didn't like it on your boat I do not think it will be any better on Serge's

Certainly, Serge should try any prop he can get on loan. That is always the best way to determine what prop woks best on a given boat; just try it and see. Likewise, if Serge can get an Enertia to try, he should go for it, but I would not use the prop that Whaler supplies Montauk 190 with a different motor as a gauge of what will work on the classic Outrage 19 which is much narrower and lighter.

I'm still thinking the 14-1/4" x 17" Stiletto Advantage is going to be the best bet, but experiment as much as possible.

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And all the while Tom is checking with his Marine Mechanical sources about this prop and hull match up.
I have found that Larry's Spectacular Outrage Classic 19 revamping has left me and my team with a few questions.
To be seen in the new thread
1975 Outrage Classic refit options.

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To sum it up
My personal thanks may have gone unanswered or did not hit the mark
I will nevertheless give my grateful nod to the experts who did spend some research on this Mercury outboard question.
It is, after all only good manners to acknowledge a service.

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I have an update to the information I published above regarding performance of a 19 Outrage with a Mercury 150 HP engine.

Before I get to that, I also re-read the thread and noted that Serge has a counter-rotating model. With a Mercury, at least, that means a 25" shaft length unless the engine was originally a 20" and specifically altered, which is not likely.

A 25" engine can only be used on a 19 with a jackplate lifted WAY WAY up. The installation will not look good at all, as the boat is designed for a 20" engine, in either single or twin configuration. Remember, when these boats were designed in 1972, 25" engines were not on the market. It sounds like the engine will need a replacement 20" midsetion installed.

Regarding my perfromance report, I have just learned from my Mercury mechanic that my engine was not performing to full HP. I have it in for routine impeller replacement, and he discovered a defective Trigger, preventing proper WOT spark advance . It is being replaced. For several years now I have thought the engine not very strong for a 150, thinking it was because of the small 2,0 liter displacement. The engine has not needed nay service since 2005. I am told to expect another 3 to 4 MPH top end, which may mean I need to go up to a 21" prop instead of the 19 I am currently using.
Or at least the 19 will easily turn up to 5600 RPM and maybe higher. I guess the new Mercury 4-stroke EFI I was considering for this boat may have to wait quite a bit longer.

Considering the weather and time of the year around here, I may not be able to test it until next Spring.