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MattMigues · #1 09-10-2013, 11:55 AM

so I'm double dipping I asked in boating but I'll aske here too. Ok so I have a new boat, used but new to me, I am running wide open 5100 RPM the boat is 15ft 54inch custom V 1/8" alum. Guy I bought from had 60 2 stroke Yamaha, I have 50 s stroke Yamaha running 10.5 x 14 prop. If I put my old jack plate I'm thinking I should pick up 200 RPM or so? Operating range is 4500-5500 but I know to get best performance and longevity it should run full RPM wide open. any of you guys can give me input? prop shop says I need to go down a pitch but says I'll lose 2-3mph so if I can pick motor up and gain the RPM I need I should get 2-3 MPH... Just guessing any info would be nice. GPS reading is 35.5MPH which is not bad but I want optimal performance.

toodeep · #2 09-10-2013, 12:17 PM

cup and go up as long as you have a good water pump/

MattMigues · #3 09-10-2013, 12:23 PM

Quote:

Originally Posted by toodeep

cup and go up as long as you have a good water pump/

The motor was on a flat before i had it way up with no issues right now it's at highest mounting point and ventalation plate is sitting right, if I put my jack plate on 6" set back I'm thinking an extra 1-1.5 inches should be perfect, I know it's a trial and era to get it exact but it should be about ball park and add the rpm's i'm looking for. So cup increases rpm?

redaddiction · #4 09-10-2013, 12:25 PM

Matt, was that you launching at Bayou Patout this weekend? If so, that was me you talked to when I was getting ready to pick up my bay boat. That was a sweet rig.

If you have a tach, then find the right mix of pitch to rpm. Raise the motor a little, or a jack plate would help with the same prop you have already. Do that before lowering the pitch of the prop. You want to hit 5500 wide open. I bet just raising it up will help.

MattMigues · #5 09-10-2013, 12:33 PM

Quote:

Originally Posted by redaddiction

Matt, was that you launching at Bayou Patout this weekend? If so, that was me you talked to when I was getting ready to pick up my bay boat. That was a sweet rig.

If you have a tach, then find the right mix of pitch to rpm. Raise the motor a little, or a jack plate would help with the same prop you have already. Do that before lowering the pitch of the prop. You want to hit 5500 wide open. I bet just raising it up will help.

Yes Sunday afternoon, you told me i had a nice looking hull? That was me and my girlfriend. I have a tiny tach which is reliable. I was thinking that just getting the motor a little higher would do the trick and just find the sweet spot. Thanks for the input.

Montauk17 · #6 09-10-2013, 04:22 PM

Can you post a pic of your motor trimmed level with the bottom of the boat. Motor height is a big factor. If done right re pitching the prop you will not loose speed. My podna Cade at acadiana propeller can get the prop right. 706-7789

MattMigues · #7 09-10-2013, 04:37 PM

I called them that's who told me about losing speed. It's at highest it can go on motor . I know about setting the motor I just didn't know the height I needed to go on jack plate. I'm gonna work on that this weekend I'm just gonna set where I think and make adjustments at landing until I get it right. Worst case I'll get it pitched.