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Old 11-11-2010, 04:04 PM
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Default How fast will 4.5HP kicker motor push this boat?

I want to mount a small 4.5HP 2 stroke Evinrude OB on the swim platform of a 25' Pro-Line. I would rather use something like a 15HP but I have had this Evinrude OB for years and it has hardly no hours on it so I would prefer to give it a try before spending the money on a larger motor.

The bracket below is how I am going to attach the OB to the swim platform on the Pro-Line. Any suggestions if I should mount the motor in the center, or off to one side or the other? Obviously I want to make sure the kicker prop doesn't hit anything so I will have to do some checking but if I have a choice of center, port, or starboard, would there be any reason to do one or another?

I would like to get about 1.5MPH out of the kicker motor for a slow troll. Do you guys have any estimate of how fast this little motor will push the boat?

Russ
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Old 11-11-2010, 04:07 PM
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my 9.9 4 stroke Yamaha will push my 25ft Parker 8 kts -10 kts
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Old 11-11-2010, 04:08 PM
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Hard to say without a trial. I would be surprised if it wouldn't make 1.5 MPH. But, it will probably be a noisy little fart and messy, too.

What kind of speed do you get from your main engine at idle?
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Old 11-11-2010, 04:14 PM
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It will push your boat at 3.5. to 5 mph on a calm day. Don't expect it to push your boat into a wind.
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Old 11-11-2010, 04:37 PM
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I agree with Yarcraft. It will push you around 4kts.
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Old 11-11-2010, 04:40 PM
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Who cares, everybody knows this is Menzies. Why do you have two login's. That's against the rules.
Check his IP...
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Old 11-11-2010, 04:47 PM
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Who cares, everybody knows this is Menzies. Why do you have two login's. That's against the rules.
Check his IP...







You (supposedly) just joined. How do you know Menzies???

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Old 11-11-2010, 04:54 PM
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The main engine pushes the boat at around 4MPH. Even dragging 2 drift socks I doubt if I could get it down under 2MPH. The drift socks are always in the way so not my first choice. My other option would be a trolling plate on the I/O but as little as I troll I don't want one of these hanging off of the outdrive.

For early season walleye fishing on Lake Erie we sometimes have to get down below 1MPH, more like a fast drift than a troll. The little outboard is actually pretty quiet up to about 3/4 throttle and will certainly be able to get down that slow. Even with a trolling plate mounted on the I/O I doubt if I could get that slow.

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Old 11-11-2010, 05:20 PM
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I went many thousands of miles on a 26 foot sailboat--with probably as much windage and more weight than your Proline pushed by a 1932 5 hp Evinrude outboard. Average speed was 5 knots. Agree that you will not push it well against wind or seas. It will work fine for trolling, but maneuvering may be a bit difficult.

I once had a transmission fail on a 62 foot motorsailor, and lowered a 10 foot dinghy with 4.5 hp outboard into the water, and pushed that boat at 2.5 knots until I could get a 13 foot inflatable, with 25 hp outboard rigged (which pushed the boat at 5 knots)
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Old 11-11-2010, 06:32 PM
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82.5 but will be much more when you put on special lower units.....sorry, couldn't resist.
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Old 11-11-2010, 07:35 PM
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Well based on the estimations it might make a great trolling motor. I can run the little 4.5HP outboard for about a week on a 6 gallon tank of fuel.

Russ
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Old 11-11-2010, 09:22 PM
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4 mph in a flat calm. Cavitating all the time. 1 to 2 in in a headwind. Any tide and you loose.
Get a bigfoot yam or Merc. 6 -7 mph hull speed, but it will work, and get you home.
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Old 11-12-2010, 01:43 AM
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Quote:
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You (supposedly) just joined. How do you know Menzies???

Think about that, Menzies just got booted, and I
just joined.... Connect the dots...
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Old 11-12-2010, 05:34 AM
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Quote:
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Think about that, Menzies just got booted, and I
just joined.... Connect the dots...
We know who you are, and funny, we did it by connecting the dots...and they don't lead to Menzies.

While your original thread(s) were, I will admit, rather amusing, polluting a thread that is asking a legitimate question takes it to far.

ProppedUp will be leaving the building now. You can go back to posting under your real screen name, which is active.
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Old 11-12-2010, 05:51 AM
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Originally Posted by THT Mod 2 View Post
We know who you are, and funny, we did it by connecting the dots...and they don't lead to Menzies.

While your original thread(s) were, I will admit, rather amusing, polluting a thread that is asking a legitimate question takes it to far.

ProppedUp will be leaving the building now. You can go back to posting under your real screen name, which is active.

BUSTED!!
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Old 11-12-2010, 09:33 AM
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I used a 2HP on a 20' boat for many years to push it between .5 to 3.5 mph by Gps. I guess with a labbed prop I could of broken warp speed at 5 mph.
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Old 11-12-2010, 10:17 AM
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I had a 15hp long shaft "safety" kicker with large diameter low pitch prop that was useless on a 23' Sea Craft if there was any head wind or adverse current. I took it off as the trouble greatly outweighed the benefit. . But if you are using yours for slow troll on very nice days your little outboard should meet your needs as long as it gets deep enough. The farther away from centerline it's mounted the harder it is to steer the boat but it can't interfere with the main engine. If you use the main engine(off) to steer that will add a lot of drag.

If the main & kicker take the same mixed or straight gas , that can avoid the hassle of dealing with a portable tank in the way.

The kicker is one more thing to potentially get in the way of fishing lines and docking , including dock lines, and has to be mounted high enough to not be submerged under any conditions.
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Old 11-12-2010, 01:29 PM
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Two things come to mind:
First, please ensure that the swim platform is strong enough to support the strain.
Second, if you can get a really shallow prop for it, you will get better performance.
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