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Author Topic:   OUTRAGE 18 with Yamaha F150: Engine Speed Comparisons
dandowneast posted 08-05-2015 01:47 PM ET (US)   Profile for dandowneast   Send Email to dandowneast  
Hello all. I recently picked up an Outrage 18 with a Yamaha F150 four-cycle-power-stroke outboard engine. It came with a 17 x 14-1/4 Michigan Wheel stainless propeller. [I think those dimensions are backwards, that is, the diameter is 14-1/4-inch and the pitch is 17. In general one gives propeller dimensions with the diameter first and followed by the pitch. I doubt the Yamaha F150 could swing a 17-inch diameter propeller--jimh]

The engine speed is 5,200-RPM at WOT. Is this a bit low? I've mostly been running at around 3,500 to 3,800-RPM and 25-nautical-miles-per-hour. What [engine speeds] are you guys running on your [Yamaha F150 outboard engine]s?

jimh posted 08-05-2015 02:34 PM ET (US)     Profile for jimh  Send Email to jimh     
Check the owner's manual for your Yamaha F150 outboard engine. It should give you the recommended engine speed range for full-throttle operation. Let us know what that speed range is. For a four-cycle outboard engine the maximum speed range is often up to 6,000-RPM, so on that general basis your report of only reaching 5,200-RPM does seem low. We need to know the manufacturer's recommended speed range to really make a judgement.
elvis posted 08-05-2015 08:02 PM ET (US)     Profile for elvis  Send Email to elvis     
Hi Dan. There's a long thread published a few months back that may help with your questions. It involves my boat, a 1987 Guardian 18, a little heavier boat than the 18 Outrage but similar in many respects. Here's the thread; scroll down a bit and you'll see the info on propeller sizes, speeds, and RPMs:

Tom W Clark posted 08-05-2015 09:00 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
How fast is this boat going at 5200 RPM?

An Outrage 18 with a Yamaha F150 should be good for about 45-MPH but I find it hard to believe a 14-1/4" x 17" Michigan Apollo could get it to that speed at only 5,200-RPM

Phil T posted 08-10-2015 04:14 PM ET (US)     Profile for Phil T  Send Email to Phil T     
Dan--in addition to Tom's question, add information on the boat:

--bottom painted
--tower or bimini up
--stern seat
--gear on board
--fuel load

Where is the engine mounted? Should be two-holes-up or three-holes-up. Also, post photos for those high and dry.

dandowneast posted 08-11-2015 04:07 PM ET (US)     Profile for dandowneast  Send Email to dandowneast     
I got just-under-40-MPH at 5,200-RPM into light headwinds with afull load of fuel, with bottom paint, and no passengers, no T-Top, no rear seat..

ASIDE: We have so much lobster gear in the water around here I rarely run wide open. I am just looking to get the best propeller option I can. Thank you all for sharing info.

tedious posted 08-11-2015 04:33 PM ET (US)     Profile for tedious  Send Email to tedious     
Dan, check your owner's manual for the recommended WOT RPM. Chances are it's 6,000-RPM, which means you currently have too much pitch. You'll get better overall performance with a different propeller. You'll likely be able to see a better top speed, and also improve acceleration and ability to hold a plane at low speeds.

I'm a fan of getting the WOT RPM pretty much right up at the redline. That generally improves performance and adds versatility. I boat in and around Boothbay, near you, and after a recent propeller change I am actually intentionally a little underpropped. I'll hit the rev limiter if I trim way out. But given the rougher water, not to mention the buoys everywhere, you rarely get a chance to go all out, so I'm happy with it.


Phil T posted 08-17-2015 03:51 PM ET (US)     Profile for Phil T  Send Email to Phil T     
Dan--was the 5200-RPM [at] WOT or as fast as you could go?

Where is the motor mounted? Top bolt holes? Where is the bolt?

0 < --- resting on the transom...0 holes up
0 < --- 1 hole up
0 < --- 2 holes up
0 < --- 3 holes up

Aside: I get what you mean about gear in the water. There are pockets in Casco Bay where [it is] like threading needles at 15-MPH. That's why I love spring and winter. Nothin' but open water like this (March, 38 & snow): 2009Boating#5310957673264397410

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