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Author Topic:   OUTRAGE 17, E-TEC 135 H.O.
gvisko posted 06-17-2014 08:45 PM ET (US)   Profile for gvisko   Send Email to gvisko  
I have a 1999 OUTRAGE 17 II with an E-TEC 135 H.O., a full tank of fuel 56 gallons, and bottom paint. The first propeller I tried was a VIPER 14 3/4 x 16. At 5,200-RPM and 42-MPH the boat would porpoise and chine walk all over, out of control. Tom C informed me I should raise the motor all the way up, which I did, and try a 15 3/8 x 18 REBEL propeller, which I also installed . I took the boat out for a test run in the bay with flat calm conditions The most I could get was 5.000-RPM at 44.7-MPH. Trimed all the way up, the boat ran great with no porpoise or chine walk. The specifications call for 5,500-RPM at WOT. Should I be concerned about the low engine speed? Thank You--George Visko
Teak Oil posted 06-17-2014 09:37 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
You were only getting 5,200-RPM with a 16-pitch propeller, so why did you think you could swing a much bigger diameter prop with two more inches of pitch (really four more inches of pitch since the REBEL pitch runs big)?

You need to drop at least two inches of pitch on the Rebel, probably three, to get your engine speed over 5500-RPM. This way when you have a heavy load on the boat your engine speed will still be acceptable. These motors need to be able to run to their max RPM at WOT. You should be able to turn 5,800-RPM on a light load, so you can reach 5,500-RPM with your full tank and a couple guys and some gear.

I have tried REBEL and VIPER propellers with good success on my Outrage with the outboard mounted all the way up.

gvisko posted 06-18-2014 09:15 AM ET (US)     Profile for gvisko  Send Email to gvisko     
Thank you Teak. I switched out the prop to see if it would stop chine walk. Maybe being that I raised the motor all the way up and reinstall the VIPER 16 [the boat] will handle better. I will try this this weekend, and will keep you posted. GV
Teak Oil posted 06-18-2014 10:24 AM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
Low mounting height is a very common cause of porpoising. I had the same problem. Certain propeller can make it worse or better, but you are on the right track.

You can try the VIPER again, it should actually be a little too small for you.

Your motor is basically a 150, so 45 to 46-MPH and about 5,500 to 5,700-RPM should be your target. You are close on boat speed. We just need to get the engine speed up a bit.

gvisko posted 06-22-2014 01:14 PM ET (US)     Profile for gvisko  Send Email to gvisko     
I put the viper back on and got 45 mph gps and 5700 rpms and slight porpoise .guess I just had to raise the motor. Going to sell the rebel on market place thanks Teak Oil
Teak Oil posted 06-22-2014 06:10 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
Good deal George.

Try moving some weight from your stern to the bow locker and console. Moving weight forward will help get rid of that last little bit of porpoising

mkelly posted 06-27-2014 10:48 PM ET (US)     Profile for mkelly  Send Email to mkelly     
Consider a small set of trim tabs...I know it's another "thing" to have to do but I did it on my 19' Outrage & it helped.
Teak Oil posted 06-29-2014 09:37 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
Trim tabs create drag and waste fuel. They are nice to have for controlling a boat and help greatly in rough seas, but the porpoising issue should be fixable without adding fuel wasting drag.

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