Prop difference?

[Destroyer]

Originally Posted by spareparts

Swap props with your buddy. Run them both again and see what happens. Is that elite a four blade prop?

X2 That was going to be my suggestion, but Spare beat me to it. But I'm still sticking to my original comment about too much pitch. I agree with everything that everyone else has said about cupping, rake, timing, weight, drag, etc, but I also believe in the KISS principal. (Keep It Simple Stupid) And right now, the simplest thing is to switch props with a known 19P prop and see how your boat (and your friends) performs with the prop change. It's a simple check and it costs nothing and that's always a good thing.

[spareparts]

the Mirage prop would be my recommendation as well

[cfelton]

What do you think about the size. 15 x 19 looks like the size most chosen.

[spareparts]

A 17 would put you in the mid 30's(too slow), a 19 would put you in the low 40's

[cfelton]

How about the diameter, does 15 inch sound right? I'll probably go with a 19 pitch for speed and economy. I don't pull skiers or a tube very much so I guess Im trying to get more milage and top end speed. My engine kinda sounds like its straining running WOT. If my buddy will swap props for a day maybe Ill try that and see how that does. I know his prop is a 19 pitch, not sure of the diameter.

[THEFERMANATOR]

Originally Posted by cfelton

How about the diameter, does 15 inch sound right? I'll probably go with a 19 pitch for speed and economy. I don't pull skiers or a tube very much so I guess Im trying to get more milage and top end speed. My engine kinda sounds like its straining running WOT. If my buddy will swap props for a day maybe Ill try that and see how that does. I know his prop is a 19 pitch, not sure of the diameter.

Only downside to the 15" diameter is you will most likely have to trim your trim anode or go with a smooth one to clear it. And be prepared to step down in pitch as the larger diamter bites better with less slip.

[twhrider2]

C... I have a Mirage 15.5x17 that gave me 38mph at 4600 WOT, a little too much RPM for the 2-barrel, I now have a 15.25x19 Mirage that I hope to try soon. And yes you will have to trim a regular trim tab. I did try a 19p aluminum that gave me 4300 WOT and engine sounded happy there no lugging or overturning but it had been ground too thin and cracked. BTW timing is 5/6 degrees, pertronix and 89 non-ethanol.
If you would like to try the 17p Mirage you are more than welcome to, also have a 21p ss not sure of make it gave upper 3's in rpms.