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Does anyone have a prop size for 150ap Suzuki on my 1989 18' outrage? I just bought this motor and need a stainless prop.

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What is the model year of the motor?

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Motor is 2015 DF150

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There has been good results running the Suzuki 16" prop [23" x 16" part # 99105-00800-23P) with the engine mounted 2 holes up.

@5500 WOT, 49.5 mph with 1/2 tank and light load.

I would start there.

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Ok thanks, I'm assuming motor mounted 2 holes up?

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That would be a good place to start.

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So these are my numbers so far.
Wot: 6175@ 37knots
4200:25 knots
Prop: 3 blade 15 1/4x19 Suzuki SS
63 gallons of fuel
2 adults
Mounted in 3rd hole from top (2 holes Up)
So I believe I need to go up 1 more hole higher and up in pitch on the prop
Let's hear some ideas

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I'm curious as to how that works out for you.....I am presently reworking my 1989 and will also power with the 150 Suzuki.

(fixed typo in year)

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Surf -

The recommendation provided was not pulled out of the nether. There is a bit of science to this which is why actual reported performance information is so critical. It came from a Whaler member who has that setup and reported his performance.

What happened to the recommended prop? Why did (the dealer I presume) ignore your request?

Your current prop is not even close to the size suggested.

Get the recommended prop installed and retest.

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I need to raise the height of the motor first, this will add more rpms. The dealer said that prop would probably be too big. 5500 @wot is not where i want to be, I want closer to 6000. I know the range is from 5000-6000 but I want the high side. I'm going to raise the engine one more hole this week then try it so I will get back to you.

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Having been a member for > 10 years I have lost track of how many dealers were completely WRONG about rigging a re-powered Boston Whaler.

One should raise the motor FIRST, then test the prop and make adjustments.

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I would be very interested to see photos of how the boat sits in the water with this engine. At 531 lbs dry weight, that is a lot of motor hanging on the transom.

Any chance you could get us some photos of it in the water?

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It sits in the exact same spot, I would put pics up next time it's in the water. I moved the batteries to the consul, there's no more oil tanks either. I had twin 70 johnsons before and I believe there weight was 248 each so with the 2 combined and the oil tanks I believe I'm the same. Water line is in the same spot.

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The dealer would and I would like to have the wot at 6000 not 5500. So the dealer is not really wrong.

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I am totally confused. According to Suzuki, the prop your dealer selected is for counter rotating motors.

See the chart: http://www.suzukimarine.com/~/media/M...s_PDF.ashx

If you want higher rpms, you would want to go from the recommended 16x23 to a 16x21.

The dropping down of 2" of pitch while keeping the same diameter will give you additional rpm's.

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Ahh, got it. I didn't realize you were coming from twins. And yeah, with the elimination of the oil tanks and moving the batteries forward, I wouldn't expect much if any change in trim (you may have actually lightened the stern!)

But I'd still be interested to see a photo if you ever have a chance.

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The prop is a 3x15 1/4x19R not counter rotating.
http://www.suzukimarine.com/~/media/Marine/Accessories/Suzuki%20Propellers/propellers_PDF.ashx.
Yes I will test the 16x20 and the 16x21 1/2, after I raise the motor height. One of these will probably be the best one for what I wish to achieve.

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I raised the motor another hole, so now it is in the 4th hole ( 3 holes up). I tried the Suzuki SS 16x21 1/2.
WOT:5375@38.4 knots
4280@25. Knots
so now I'm going to try the Suzuki SS 3x15x21
I'm hoping this is the final test I need to do.

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Typically one changes the pitch only. You are changing pitch and diameter.

I am interested to learn the results.

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Ok finally got my new prop Suzuki ss 15x21 3 blade. Pretty happy with the results I don't think I will do any better.
4400 rpm @33 mph
6000 rpm @ 46 mph

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Not sure if the upload worked but here's a pic of the whaler.

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The splash well is dry, no water. Hard to seethe black water line but it it about 1-2"above the water

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Another look

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Thanks for the photos. Very nice looking engine, especially in the white color.

Is your console/leaning post shifted farther forward than the OEM configuration? In one of the photos it almost looks that way, but it might just be the perspective.

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I believe it's in the OEM spot, it is the OEM leaning post.i took the top off the aluminum supports and made the cutting board top. I need somewhere for my live well and this worked out great.