prop trouble

[andyfasching@hotmail.com]

i'm looking for some help, I have a 2008 f90 on my ranger 618t im have troubles with it plaining out it has a 4 blade 17 pitch on it now any info for me would be great:bangin:

[propmann]

Powertech RXB4 15 pitch best prop out there for that combo. We have props lots of those boats and that the prop that we found that works on that boat.

[andyfasching@hotmail.com]

thanks, right now it runs at the most by my self about 35 mph at 5600rpms I was told it can run up to 6000rpms how much will that afect my speed and rpms.

[propmann]

Your rpms will be in the 5900 to 6000 range and speed will be 35 to 37 , we have seen 39 with this prop when conditions are perfect mostly 36 mph, with a heavy load you'll probalaly lose a couple mph.

[Trailhound]

Best I could get out of a RXB15 power tech prop was 36 mph. Mostly 34.5-35.5. I run a 618T and went back to a Vengeance 16P prop and put a cobra edge on my boat. Best thing I've ever done to the boat. Great hole shot and top end now back up to 36.5-37 alone and 36-36.5 two people. The RXB15 prop did not work for me. Could only get about 5750 for rpms and did not handle the boat at all with two people in it. FYI, my boat always has a heavy load, rod lockers full, kicker motor, three batteries, bow mount, two 20lb anchors, and 3 heavy boxes full of musky baits, plus walleye stuff. If you want a RXB15 I have one for sale cheap.

[andyfasching@hotmail.com]

thanks for your reply, is your prop a 3 or 4 blade and what is the cobra edge

[Trailhound]

Its a 3 blade prop from Mecury. Lots of 618T have this prop and it was recomended by lots of guys on this site and my dealer. Just google cobra edge and it should come up. Have to drill 6 holes in the cavitation plate. but was real easy to do. Glad I did it. A guy called Crazy Cooter on this site recomemed it after he put it on his 618T. Took his advice and am really happy with my boat now. My boat is also a 2008 and so is the engine. It just took me till a couple weeks ago to be happy with it.