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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?
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:
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.
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.
Edited by ritzyrags on 10/07/11 - 2:55 AM
Dont lie
Dont Cheat
And dont give up..
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.
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.
