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  Proper hp for 18' OR trolling motor. 9.9, 15? Advantages?

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Author Topic:   Proper hp for 18' OR trolling motor. 9.9, 15? Advantages?
zpeed7 posted 01-23-2003 02:02 AM ET (US)   Profile for zpeed7   Send Email to zpeed7  
While rebuilding my 86 Outrage 18' I'm considering installing a trolling motor. What are the adavantages of having a trolling motor? I usually fish for Mahi-Mahi, Bonito, Tuna ect. But also like to go after a Blue once in a while so have to be able to troll at a nice clip. I was thinking something in between 9.9 and 15, would that be enough? What would be best 4S or 2S? What shaft size? I wouldn't want to add too much weight at the back either. I currently have a 150 Evinrude main engine. What long should the shaft be? A have an 80's 6hp Johnson laying around in the garage, but I'm pretty sure that won't work. Any suggestions?

Thanks in advance,

gvisko posted 01-23-2003 07:49 AM ET (US)     Profile for gvisko  Send Email to gvisko     
I have a 2000 15 hp johnson 20" shaft bolted on to my transom of my 83 outrage .
the long shaft is a must and you must remove
factory turn screws to install .
moves the boat real nice. gvisko
Bigshot posted 01-23-2003 09:34 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
That 6 would be perfect but if short shaft you either need an extension or a bracket that swings down to run it. Putting a 15 on it is peeing in the wind. There are dozens of posts here about kicker size and a 5-10hp on an 18 is the range. You could put a 30 on there and it would not do much more than a 6 or a 9.9.
Bigshot posted 01-23-2003 09:35 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
PS get the high torque sailing prop like a 5x5". Will work wonders. If a 6 can push my sisters 23' O'day to 5+knts, it can push your 18'.
Tom W Clark posted 01-23-2003 12:46 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

I owned a 1983 Outrage 18 for over ten years. During that time I had a 15, 9.9 and 8 hp motors in both two stroke and four stroke configurations. Let me make a few observations:

Regardless of what you put on your boat, you need a 20 shaft motor clamped directly to the transom. On m boat I used a simple tie bar to connect the kicker to the Johnson 150 I had. This was a most satisfactory arrangement.

For use as a trolling motor or kicker, there is zero difference between a 15 and a 9.9. In all the brands I can think of, both these models are the essentially the same except for some tuning hat allow the 15 to generate more power at wide open throttle, a throttle setting that kickers rarely, if ever, see.

I also used a Yamaha 8 two stroke and an Evinrude 8 four stroke. both of these motors were more than sufficient for the task.

No matter how big a kicker you get, you are limited by the boat’s hull speed as to how fast you can troll. Unless a kicker is big enough to begin to get the boat to climb on plane, your top speed for trolling is going to be about 7 mph.

whalersman posted 01-23-2003 12:51 PM ET (US)     Profile for whalersman  Send Email to whalersman     

I have a 1985 Outrage 18 with a 1985 Evinrude 150 HP. I also have a 1988 Evinrude 8 HP with Long Shaft and installed on the Port side. It runs the boat just fine for trolling, I haven't tried to see how fast it would push the boat though.

I would think that your 6 HP would be just fine for trolling. If it doesn't have the Long Shaft, you could always purchase a Shaft Extension kit on eBay or buy new from an Evinrude dealer.


I did not have to remove my Engine turn screws. My 1988 8 HP Evinrude was able to unscrew enough to fit over the transom.
I was thinking about taking off the Ski, Lifting eye of the Port side of the boat so the Engine could be mounted a little more to Port because the two engines mounted together are a little close to each other. The 150 HP just hits the 8 HP if I give it a FULL turn to Port...

whalersman posted 01-23-2003 01:19 PM ET (US)     Profile for whalersman  Send Email to whalersman     

You beat me to the Post......

Did you have any problems with the 2 Engine Cowls hitting each other in a Full Turn to Port???

Tom W Clark posted 01-23-2003 01:41 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

No I didn't, but I should have mentioned that the port towing/lifting eye needs to be removed so you can mount the kicker far enough away from the main motor that interference is not a problem.

On my boat I just filled in the old hole for the tow eye and then reinstalled it between the big motor and the kicker. That way it was still available for use.

Set up like this, the motors never touched one another regardless of whether they were both tilted up or both tilted down, or if the 150 was down and the kicker was up (or vise versa, which never happened). I never needed to remove the tie bar, though I could in just a few seconds.

I remember the kicker was mounted far enough to port that the port screw clamp was right where there transom begins to flare out and get thicker and the port clamp was just barely able to open up enough to clear the transom, but it did.

I used the auxiliary mounting bolts on the OMC motors too. These were 5/16 bolts with fender washers on the inside of the transom under the bolt heads and 5/16” SAE washers and nylock lock nuts on the motor bracket.

gvisko posted 01-23-2003 05:04 PM ET (US)     Profile for gvisko  Send Email to gvisko     
The 2000 johnson 15 would not fit over transom unless I removed the factory screws
it was close but would not go . had to move
the tow bolt so it would clear the 150 hp.
It might piss in the wind but if I need
to come back tru moriches inlet I would
feel beter with the. 15 we fish big water out here. gvisko

zpeed7 posted 01-23-2003 07:46 PM ET (US)     Profile for zpeed7  Send Email to zpeed7     
Thanks for the help guys. I think I'm going to try the 6 first to see how it goes. Maybe I can save some $$$. It's in pretty good condition. It's a short shaft so I'm going to have to find an extension kit. I think there's a website somewhere that specializes in this.

Thanks again,

Outrage18 posted 01-24-2003 02:41 PM ET (US)     Profile for Outrage18  Send Email to Outrage18     
Does anybody use a kicker bracket?
Bigshot posted 01-24-2003 02:46 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
No need much less room on an 18' outrage with the wide transom. Just clamp and go, save the $100. Plus those mounts bounce around a lot.

I wonder if you could get away with a SS on an 18 if the engine is all the way to one side being the degree of the hull would be less. If the prop clears the bottom of the hull, I think you would be ok unless it is rough out. Mount that 6hp and see where it sits.

Abalonehunter posted 01-30-2003 03:22 PM ET (US)     Profile for Abalonehunter  Send Email to Abalonehunter     
On our 22 Revenge full-transom we had a bracket that we mounted several different motors to. All bounced badly if in the up mode (somewhat horizontal) but the long shaft ones in down mode (vertical) hit the water while on plane though not bad it spit water up and over the transom. While trolling the short shaft yamaha 15 hp, was fine in down mode but if you had a big swell it would often clear the water. Long shaft yamaha 8hp worked great and was light but gave off bad frequencies that we believed scared off the salmon, 20 hp long shaft Chrysler, had to use it once, that was enough, 9.9 hp long shaft high thrust 4 stroke yamaha was the perfect answer, was also nice in that we rigged it to use the main tank for fuel since it needed no oil mix and the main engine had its own oil reservoir. I'm not sure a 6 hp would have pushed the boat fast enough for trolling for tuna, but the 9.9 easily pushed us around.

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