Sizing your prop

[revmax]

Went out last night and hit 4600-4700 rpm's at WOT with that 21 pitch prop according to my engine tach.I think the I/O's can spin a bigger pitch than OB's however no where near the speed. Only 32 mph. But I still love her.

[reelapeelin]

Rev, if she's tachin' out at those numbers, sounds like right prop ;) ...ENJOY!! ;D 8) ;D 8) ...

[revmax]

RP,
Thanx for the feedback, by the way I'm jealous of your boats' name. That's a winner!

[reelapeelin]

Thanks Rev...my daughter helped come up w/ that... ;) ...

[msbhammer]

Not to beat a dead horse or thread, but I'm replacing my prop. The size i have now is a 14x19.
I went to west Marine and the have a 141/2 x 19 inch prop. Will this work ?? or cause problems ??
Running a 200 Merc.
Thanks. ;)

[reelapeelin]

Hammer, I'm thinkin a 15 1/2" dia x 17 pitch is gonna be THE prop for ya ;)...if you can try a Merc Mirage in that size, I'll bet you'll be smilin' like a mule eatin' briars ;D ;D ...

[msbhammer]

Thanks Reel,
Should I replace the hub as well. Is it required ??

[TheTinMan]

Originally Posted by reelapeelin

Hammer, I'm thinkin a 15 1/2" dia x 17 pitch is gonna be THE prop for ya ;)...if you can try a Merc Mirage in that size, I'll bet you'll be smilin' like a mule eatin' briars ;D ;D ...

RAP, is that right for a 200hp motor??? I thought a 19 pitch is for a 200. I'm running a 14x19, only I have not replaced my tach yet so I can't tell what I'm running WOT.

hammer, what are you toppin out at (rpm's)?

[msbhammer]

Was doing 39 mph on a dinged up prop and pushing about 5000 rpms.

[reelapeelin]

Although a different application, my bud's cat w/ twin 200 Optis has THAT size Mirage on both...gets ALL the RPMs there are to get and boy is she FAST :o ...and fuel efficient...

Hammer, those numbers sound like you can get some more outta that motor...and it's not about goin' as fast as you can...it's about havin' the most efficient prop in terms of performance, gas economy and your motor's life-time... ;) 8) ...