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#12429050 - 09/16/17 06:50 PM New Yamaha 115 Propped Correctly?
Bob Landry Offline
Extreme Angler

Registered: 08/10/11
Posts: 2662
Loc: Austin, Tx
New Robalo R180 with Yamaha 115 FourStroke. Motor just turned over 10 hours, so I'm checking RPMs. With my self and wife in the boat, half a tank of fuel, WOT is 5600 and speed is 34 MPH. Later in the day, and with an additional person, WOT RPM drops to 5400, don't remember the speed, maybe 32. Operating range of this motor is 5000-6000 RPM. It also is a little anemic getting up on plane, but it is a heavy fiberglass boat, so that's not a serious issue at the moment and maybe a four blade prop to add lift to the stern is the answer there.
I'm not concerned about the top end speed as this is the wife's boat and it's a play boat for lake fishing, knee boarding, tubing etc. My concern is that I've run a lot and will be running quite bit in the lower RPM range and I don't want to dog the motor at the lower RPMs and I'm concerned that it may not be propped correctly for my intended use. Normal load is going to be 2-4 people. I understand it's hot weather and I'm going to pick up some RPMs as it gets cooler, but most of our play time is in hot weather. I can't find the paper that has the prop size and pitch on it, but that shouldn't be needed for a general question like this.
What say you Yammie gurus?
_________________________
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115

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#12429063 - 09/16/17 07:06 PM Re: New Yamaha 115 Propped Correctly? [Re: Bob Landry]
Bob Landry Offline
Extreme Angler

Registered: 08/10/11
Posts: 2662
Loc: Austin, Tx
I just looked up the performance bulletin for my boat and motor combination and it shows the test boat did 30 MPH @ 5000 RPM and 34MPH #5500. That's right in line with what I saw today so maybe I'm within the range I should be. The test boat rigged like mine with two peopl was 3300 lbs. Lot of weight for an 18' boat, even if it is fiberglass.
_________________________
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115

Bitter Gun Owner
Bitter Clinger
Armed Infidel

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#12431868 - 09/18/17 05:03 PM Re: New Yamaha 115 Propped Correctly? [Re: Bob Landry]
Capt Craig Online   content
Extreme Angler

Registered: 08/25/09
Posts: 1427
Loc: Richland-Chambers
Yep, that is a heavy boat, but I know you will enjoy it!!
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Capt. Craig Copeland
Licensed by the US Coast Guard

2013 Nautic Star 2110 Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)

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#12453674 - 10/05/17 12:20 AM Re: New Yamaha 115 Propped Correctly? [Re: Bob Landry]
Curtbass Online   content
Extreme Angler

Registered: 04/17/15
Posts: 1164
Loc: Grand Prairie, Tx
4 blade prop is usually a smaller diameter so same pitch prop in a 4 blade will keep you in spec range. But added benefit of creating more stern lift helps keeps bow down better & pilling tubers or skiers will benefit by better bite getting boat up on plane easier. Actually a 4 blade is exactly what you want if boat is loaded heavily
_________________________
'98 Tr20 Triton
'94 Merc 200Xri
HydroDynamics 10" JP
Tempest Plus 25P-B&B @Steves Custom Props-Josh Edwards
HB999HDSI
HB899HDSI

92' ChampioN 201DCR Elite
13' Yamaha250SHO
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