Answer
May 10, 2024 - 11:52 AM
Given the 4-blade aluminum performance, I'd look at a 14- or 15-pitch NRS4 to get closer to that 6000 RPM's
Prop recommend PowerTech NRS4 Propeller Yamaha 50-130 HP
I have a 1997 wellcraft 190 ccf 19 ft center console with 2001 yamaha 130 v4 2 stroke. I put a 4 blade aluminum prop on 13.25 x 17 pitch (same as my prior prop but this one has 4 blades) took it out today hole shot greatly improved planes faster less bow lift coming up on plane. Top rpm was 5400 rpm so I lost about 600 rpm. Previous prop was stainless so maybe that accounts for the big rpm difference? I was expecting about 300 rpm loss and even brought a 4 blade 13.25 x 19 pitch along but figured that would have pulled my rpm down even more. So now I have to decide between 13.25 x 17 4 blade stainless or go even less pitch like 16 or 15? Top speed with the 3 blade was 47 mph. 4 blade aluminum was 42 mph. Not super concerned with a few mph up top. This motor is rated at 130 hp at 5500 rpm. Operating range is 5 to 6k. For reference the boat had a full tank of gas (50 gal). And just me on board. IN the future might have 3 or 4 people aboard. Any advice or comments regarding prop selection based on above data is welcomed.
These boats are stern heavy and porpoise easily.
These boats are stern heavy and porpoise easily.
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Open May 09, 2024 - 07:38 PM
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PowerTech NRS4 Propeller Yamaha 50-130 HP
PowerTech NRS4 Propellers are 13.25” diameter, perfect Flats ‘n’ Bay prop. Similar to Turbo & Mercury Laser II Propeller families.
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