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Author Topic:   1997 Crosstackle 17, 115-HP Johnson
whalersailer posted 05-15-2007 10:31 PM ET (US)   Profile for whalersailer   Send Email to whalersailer  
Hi all. Last weekend I was able to get my [just acquired] Crosstackle 17 out on the water. I sea trialed her before purchase in February, and she seemed under-proped at the time. Her performance this weekend confirmed the initial impression.

Engine is a 1997 Johnson 115 Oceanrunner 25-inch shaft mounted with the anti-ventilation plate about 1-inch above the bottom of the hull. The prop is an OMC 391239 15 X 17. The prop looks like it is in good shape and operates smoothly. With moderate to heavy load of five two adults, three seven-year-olds, full fuel, some other fishing stuff including two Group-27 batteries in the console, the boat accelerated incredibly hard. It seemed to accelerate faster than my Montauk with 90 E-TEC did. The motor ran right up to the 5,500 rpm redline with no problem. I had to throttle back to avoid exceeding redline. At 5,500, the GPS (WAAS enabled) indicated about 32 knots. The boat performs very well and was very well mannered in all other respects.

Does this performance seem right for this setup? I'm not sure what the gear ratio is on this engine.

What propeller to try? I had a Stiletto on the Montauk with 90 E-TEC I just sold, and that prop was great. I'm thinking of another one for the new rig, but which one? The Advantage I 19-pitch? Does that sound about right?

Thanks in advance for any help!


Tom W Clark posted 05-16-2007 12:15 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
I find it hard to believe you have a 15" diameter propeller on your V-4 OMC motor. Intermediate gearcase motors like the 115 generally use propeller diameters of 12-14 inches.

I cannot find the OMC prop # you cite. The only 15" x17" propeller I can find is #391200 and it is designed for the V-6 130 HP-300 HP models, not the V-4s.

At any rate, I think you will do much better with a different propeller. There are numerous props to try. If you want a Stiletto Advantage II, try the 13-1/4" x 17" which will perform more like a 19" pitch prop from any other manufacturer.

I predict your acceleration will improve and your top speed will climb to 42 MPH.

You might also consider a four blade like the Stiletto Bay Pro I in the 13-1/4" x 17" size (part #24417) or even Mercury's Trophy Plus in the 13-1/2" x 19" size.

You might even try a Mercury Laser II in the 13" x 20" size if top speed is what you are after.

Whaler factory literature in my possession indicates the 17' Outrage II was tested with a 115 HP Evinrude equipped with a 14-1/4" x 21" OMC SST prop and hit 43.9 MPH with three people on board. That seems like a lot of prop!

Hmmm, does the OMC 115 of that vintage use the V-6s gearcase?

Lil Whaler Lover posted 05-16-2007 07:03 AM ET (US)     Profile for Lil Whaler Lover  Send Email to Lil Whaler Lover     
Tom and Whalersailer,

We have OMC mixing up lower units again within a horsepower range. For some reason (probably known only to God but see possibility below), OMC changed out the lower unit on the 25" shaft 115 horsepower 60 degree V-4 outboards in the 1995 model year. All motors of this configuration (25") were built with the larger gearcase of the 130 horsepower model.

This gearcase came with a 12:27.(.44) gear ratio and the larger propellers would be the correct fit.

The standard 20" shaft 115 horsepower stayed with the 13:26 (.5) lower unit and the smaller propellers would be correct.

Interestingly, if you run the prop calculator numbers for the factory test Tom referred to, it calculates a 10% slip.

My recollection is that OMC did this because back in 1995 OMC expected most 25" shaft motors to be installed as twin installations on larger off-shore boats. The 25" transom height was not in vogue then.

This motor will require the larger diameter prop to function optimally. All of this information is directly from the applicable Johnson sales brochures.

Tom W Clark posted 05-16-2007 08:20 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Thank you Dave for clearing that up.

OK then, Whaler used a 21" [prop on this boat, while you have a 17" pitch prop. My guess is you will happy with something in between.

Your choices of V-6 (large hub) propellers in the 19ish pitch sizes are numerous. Of course, the first prop I think f is the 15-1/4" x 19" Mirage Plus. This may be a little large for your configuration. The 19" Mirage Plus also runs more like a 21", which given the 21" SST Whaler used might be OK.

There is the Stiletto Advantage II in the 14-1/4" x 19" size. This prop should be fast and grip well. It will turn about the same engine speed as a Mirage Plus. This I have verified on my own boat.

You could try a Michigan Rapture in the 14-1/4" x 19" size. This appears to be very similar to the Stiletto Advantage II in design. I mention this one because I have a used one here now I will sell for a very good price if you are interested. It is like new.

Tom W Clark posted 05-16-2007 09:31 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
I should add that if you want a Stiletto, you will need an Advantage II, not an Advantge I.

Matt Frymier has a 14-1/4" x 17" (hubbed for OMC) Advantage II for sale, or at least he did.

I can get you a 14-1/4" x 19" Advantage II if you like.

whalersailer posted 05-16-2007 10:16 AM ET (US)     Profile for whalersailer  Send Email to whalersailer     
Thanks guys!

That's just the type of information I was hoping to get.

Tom, I'll send you an e-mail shortly.


sternorama posted 05-16-2007 01:46 PM ET (US)     Profile for sternorama  Send Email to sternorama     
I am selling my old 3 blade, 19" pitch Quicksilver S/S prop for $125.
It has the flo-torqII hub. Any interest? Make me an offer!
pictures available
whalersailer posted 05-31-2007 10:54 PM ET (US)     Profile for whalersailer  Send Email to whalersailer     

This evening, I tested the Rapture 14 1/4" X 19" that Mr. Clark was gracious enough to let me try. The Rapture perfomed quite well, and I am pleased with it.

I tested it on a 1.5 mile long lake with almost ideal calm conditions and a 5-10 knot breeze running parallel to the test runs. I was on board with my 3 year old daughter, and the fuel tank was about 3/4 - 7/8 full (about 45-50 gallons).

5,400 RPM - 36 knots into the wind and 37 knots with the wind. There was more trimming I could have done, but my daughter wasn't game for running any longer on the all out speed runs.

4,500 RPM - 28.5-29.5 knots

3,500 RPM - 21.5 knots

The acceleration was still very good, and the prop stayed hooked up well in turns.

Overall, I am quite happy with the way the rig now performs.



Tom W Clark posted 06-01-2007 09:45 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

I'm glad things worked out so well. The correct propeller can make a huge difference in the performance of one's boat.

Cross Tackle posted 08-04-2015 03:31 PM ET (US)     Profile for Cross Tackle  Send Email to Cross Tackle     
[Revived thread that has been dormant for eight years, then changed the topic of discussion.]

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