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  Single vs. Twins and Planing on 1 engine

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Author Topic:   Single vs. Twins and Planing on 1 engine
Plotman posted 04-29-2004 08:36 PM ET (US)   Profile for Plotman   Send Email to Plotman  
I know there has been a lot of debate here recently on the concept of twins versus a big single plus a kicker. A number of people questioned whether the boats would be able to plan on a single engine.

Well after having trialed 3 different outrages with twin engines, I can report that all were able to plane easily on one engine. I tested 2 different 22s, 1 with 2x130 Yamahas and one with 2x115 mercs, and one outrage 25 with 2x15o OMCs.

I only have data on the 22 with 130s on it. (the one I bought). With both engines, 500+ pouns of people and 3/4 tank of fuel, the boat does 49mph by GPS on with both engines at 5800RPM turing 13x19 yamaha props.

With one engine shut down and trimmed clear of the water, the boat took just a few extra seconds to plane and reached a top speed of 38 mph at 5300rpm, and cruised nicely at 30mph. (By way of comparison, my old 22 tops out at ~44 with a t-top and a merc 200 that needs to come up 2 holes.)

The 25 planed easily with 6 adults on that one engine, 3 of whom were sitting in a stern seat.

In all cases, coming home on the single would have been vastly preferable to the 8-9mph the kicker would have provided.


andygere posted 04-30-2004 11:31 AM ET (US)     Profile for andygere  Send Email to andygere     
It's good the hear that you've experienced a 22 that will plane with a single 115. Were the motors 2-strokes (in all cases) and were the boats notched transom or Whaler Drive?
kamie posted 04-30-2004 01:50 PM ET (US)     Profile for kamie  Send Email to kamie     

thanks for the info. Now if they would just put the new engines on a diet, I could put a pair on the back of the 18 Outrage

Plotman posted 04-30-2004 02:33 PM ET (US)     Profile for Plotman  Send Email to Plotman     

Standard notched transom in all cases, and all engines were carburated 2 strokes - vintages 1991 through 1995.


andygere posted 05-01-2004 02:45 AM ET (US)     Profile for andygere  Send Email to andygere     
Ah, the good old days of lightweight, high performance carburated 2-stroke motors. Unfortunately no longer available in my home state...

Thanks for the info David.

ecutlip posted 05-04-2004 12:31 PM ET (US)     Profile for ecutlip  Send Email to ecutlip     
I haven't had a chance to do much with my 1986 Outrage 18 with twin 1986 Johson 70's yet. But since I was worried about the temperature guage reading too hot on one of them, I did get a chance to run it on one engine. It planed quite easily (although the engine does have some kind of "fin" on it so that might have helped). I didn't have the bugs worked out on the speedometer yet so I don't know how fast it was going. But, we ran it at about 3000 to 4000 RPMs and I had to turn my baseball cap around so it wouldn't fly off :) I did have the other engine trimmed all the way up and out of the water.


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