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Author Topic:   Outrage 18 w/ Yamaha F150 Performance results
rjgorion posted 06-09-2004 09:13 PM ET (US)   Profile for rjgorion   Send Email to rjgorion  
Okay guys, here are the performance results for the 1984 Outrage 18 with the Yamaha F 150 as run today with two people on board, 30-35 gallons of fuel, cooler w/ ice and lunch, electronics and fishing gear. Air temp ~ 70, water temp ~ 65-70, light wind (5-10 mph) and 2-4" ripple/ chop on the water, time 10 am. The Outrage has old bottom paint on it and the prop is 13 3/4 x 19 Yamaha Black Steel. All speeds are mi/ hr as noted by gps.

Idle 600 rpm........................2.8 mph
1000 rpm........................4.5 mph
1500 rpm........................6.5 mph
2000 rpm........................7.7 mph
2500 rpm........................14.0 mph
3000 rpm........................22.8 mph

At this point I trimmed out half way.

3000 rpm........................24.0 mph
3500 rpm........................28.2 mph
4000 rpm........................32.1 mph
4500 rpm........................37.3 mph
5000 rpm........................41.7 mph
WOT 5400 rpm........................45.1 mph

I should have trimmed out all the way to see if the rpm and speed changed and by how much but I didn't because I still getting used to this boat and the new motor. Under different conditions, results may be a little different but this today's result. At any rate, there you have it. As an aside, only caught one fish but did not get skunked.



gf posted 06-10-2004 10:05 AM ET (US)     Profile for gf  Send Email to gf     

5400 RPMs is too low, you really want that engine to be spinning 6000 RPM at WOT with a typical load on board.

I would look at upgrading to the Yamaha Performance Series 14.25" X 18 (or 16) pitch propeller. Or if the price is too much for you, at least try swapping for the Yamaha 13.75" X 17 (or 15) pitch black steel prop.

elaelap posted 06-10-2004 12:50 PM ET (US)     Profile for elaelap  Send Email to elaelap     

Where the hell did you find a place around here to boat (and catch a fish!) with virtually no wind? Bodega Bay's been blowing 20-32 kts consistently for a couple of weeks.
Even the big party boats have only gotten out a couple of times, and this is the early stage of the height of the salmon season (June 1-July 31), so their poor skippers and deckhands are eating it financially, especially since rock fishing was closed last winter and again this spring and summer up until August 1st.

What turns are you making when you get onto plane, and at what speed, please? Looks like it's between 25-3000 rpm; my Yamaha 115 4/s needs 3000-3100/17 mph to plane in smooth water, if I can find any.


rjgorion posted 06-10-2004 10:04 PM ET (US)     Profile for rjgorion  Send Email to rjgorion     
Hi Tony, I went to Lake Berryessa and caught one nice size trout and the wind did not really come up until about 11:00 am so we had some time in the morning to test with light winds. And yes it has been much too windy to go out for salmon. I forgot to write down the minimum planing speed but I think it was around 19 mph @ ~ 2700 rpm. I'm going by memory here so I could be a little off. I know that the max rpm is 6000 for the F150 and I only achieved 5400 so I want to go out again, retest and try trimming all the way out to see the effect, as well as verifying my own data recording to ensure accuracy. Also the motor is mounted one hole up so I may try moving it up one more hole before buying another prop. I now have 13.5 hrs on the engine so I would like to do the first oil change before I go out again.



rjgorion posted 08-04-2004 08:56 AM ET (US)     Profile for rjgorion  Send Email to rjgorion     
After having done the first oil change I was recently able to get out and run the boat/ motor for more testing and fishing on the river. With the 13.75 x 19 black steel prop, I was able to consistently get 5800 rpm trimmed all the way out. There was ~ 1-2" ripple on the water with 5-10+ mph wind and ~ 1mph current. Going with the wind and the current I was able to get 49.5 mph @ 5800 rpm. Going against the wind and current, I was able to get 47.5 mph @ 5800 rpm. Although this speed is a little fast for trolling for stripers, it gives you an idea of what this motor can do. Also, it pops right up on plane in the blink of an eye. Thanks,


myakka posted 08-06-2004 06:15 AM ET (US)     Profile for myakka  Send Email to myakka     
Any idea what the engine is burning at those rpms?(looking for best gph for mph) For my boat, "82" 18 outrage with "99" merc 150 carb, 8 gph at 27 mph =212.5 miles with no reserve(63 gal tank) Thanks
rjgorion posted 08-06-2004 10:28 PM ET (US)     Profile for rjgorion  Send Email to rjgorion     

you can view the performance bulletin on the yamaha website ( and it will show you the fuel consumption numbers for the F 150 on various boats. I looked at the numbers for the 18'Edgewater, which is similar to the Outrage 18. Here is just a short summary of the numbers.

rpm mph gph

3000 19.8 3.5
3500 26.5 5.1
4000 30.5 6.3
4500 35.5 8.3
5000 40.1 10.5
5500 45.7 14.3
5800 47.7 14.5

While I don't have fuel consumption numbers for my boat/ motor setup, my rpm and mph numbers were pretty close to the numbers reported in the yamaha tests. So I would bet that my fuel numbers are pretty close as well. I don't know how these results would compare to a 2 stroke engine of similar hp but my F 150 doesn't seem to be a gas hog especially at the low to mid rpm ranges. I hope this helps. Thanks,


myakka posted 08-06-2004 11:40 PM ET (US)     Profile for myakka  Send Email to myakka     
Thanks for the info! I went to but on the preformance page when I click on "edgewater 18 sentinal"
I get "you are not authorized to view this page"
Thanks again
rjgorion posted 08-07-2004 08:12 AM ET (US)     Profile for rjgorion  Send Email to rjgorion     
Mike try this, it worked for me. I'm not sure how to activate this link though. Once you get to this page click on the F 150 link or the edgewater 18 link and it will take you to the performance bulletin.


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