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Posts: 304
Location: Lino Lakes, MN | VMS and others,
Guy's there has been some great info under the Muskie Boats and Motors.
My problem is I have already fixed my Aluminum prop twice and I am looking to upgrade to a Stainless Steel Prop.
Currently I have a stock Yamaha Aluminum 13X19 K prop and I am running at 5900 rpm at WOT.
Which prop would be recommended. I don't know what mounting hole my motor is mounted in right now. I do get cavitation when I make turns while running at 80% throttle.
I do have a slight bend in one of the repaired blades but not much. I am only looking to drop RPM's by 200-300.
Thanks
Steve
P.S. is anyone currently running the same rig? What props / rpm / performance are you getting out of it?
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Posts: 5874
| Put this on the WalleyFirst board for moreyes. He had that same boat motor. I don't know if he had a SS prop or not. I think EsFishOx had the same combination, too.
I would try to find a Yamaha dealer that has a demo prop program, and then you can try several props and select the one that gives you the best overall performance. I would probably start with a 17P or 19P 3 blade, and see if that keeps you under the 6000 redline. Not all that familiar with Yamah Props, but I had a Merc Lazer II 23P on my 1700 Angler with 135 Opti, and that prop was really good for that boat. Easy boat to get on plane, too. I know of that same set up that would have good holeshot and WOT of 48+/-.
Normal to expect an aluminum prop to blow out on turns. A SS prop will make a big difference in performance on your boat.
Edited by Shep 8/19/2008 9:11 AM
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Posts: 3514
Location: Elk River, Minnesota | Hiya,
I have heard that the pro series props by Yamaha have worked very well with that combination. I think that might be what Moreyes runs if memory serves me correctly. If your motor is mounted down flush to the transom, you could move it up and potentially try a 13-1/2 x 19 pro series prop. You might lose a few RPMs overall, but if you go down 400 by the prop change, and gain 200 back by moving up 2 holes or potentially 3, you'd be right where you want to be for your desired RPM's.
I believe that motor is designed to have a top RPM of 6000, so you may also need to consider a 17 pitch as well. I know some guys who run the Michigan Rapture as well and have had good results with that prop as well. Lots of props to choose from so Shep's suggestion of finding a prop shop/dealer that has a demo prop program would be ideal. Take a bunch of props and try them all...one will stick out as being better than all the others.
Good luck and enjoy the project!!
Stev |
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| I did as recommended and tried out a demo prop. I tried the Laser II in a 131/4 X 19. My rpms dropped to 5200. Like I stated I am mounted all the way down in the bottom hole.
My top speed picked up like 4-5 mph. I did notice some major improvement in the handeling.
I take it if I was to mount the motor up a hole or 2 I would gain back 200-400 rpm?
I need a prop expert to tell me about some differences in the different brands.
I will definitely try a couple more props before I make the selection.
Thanks for the help.
Steve |
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Posts: 3514
Location: Elk River, Minnesota | Hiya,
If your motor is all the way down, I would definitely move that motor up to the 3rd hole and test there. You should gain back around 200 to maybe 300 or so RPM which would put your right in the range you are looking for and probably without a noticeable loss in handling. Nothing like trying it out and seeing what happens.
Keep trying props...one will stand out and feel awesome as compared to the others... Takes time, but with patience you'll find it...
Steve |
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Posts: 412
Location: Waukesha, WI | had a Merc 90 4 stroke on my Mr Pike 17 with an 18 pitch Vengeance stainless prop. The motor was mounted in the middle position. I could get the prop to blow out easily on tight turns. I also think there was room for improvement in propping etc. |
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