Ranger Tim
Well-known member
Those figures fall in line with my experience. Nice to feel validated! Gotta get one of them fuel manager thingies.
2120 SC prop
- Thread starter rplas48
- Start date
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JC your numbers are in line with what Yamaha has on their site for the 14 1/4 X 16 prop. However, their performance numbers are much better for the 13 3/4 x 17 prop.....4500rpm, 30.4 mph, 3.75 mpg with the boat reasonable loaded ie, full tank of gas....weight as tested 4,924 lbs.
Recently bought the 133/4 black steel prop and plan to run some numbers in the spring
Ray
Recently bought the 133/4 black steel prop and plan to run some numbers in the spring
Ray
greatcir
Well-known member
Looks like Piranha makes the hub and replacable blades for Yamaha 150 4 stroke (mine is a 2007). My dealer says I have a 14.25X16 ss. It's in the water so have not checked pitch & diameter yet.
http://www.piranha.com/
Seems to me easier to store three blades as a spare instead of a conventional prop, maybe could repair in the water and the guarantee looks interesting.
"We long ago realized that it isn't possible to predict with 100% accuracy how well a particular propeller will be matched to an particular boat/motor/useage combination. To make sure you get what you need we offer our blade exchange program. If the propeller isn't working right, you can arrange to exchange the blades for a different size until the boat is functioning to your satisfaction. That's an offer you won't find from any metal propeller maker. That's one more reason Piranha is the superior Boat propeller choice.
If we can't get you the propeller you need, we'll get you your money back
-- Guaranteed. "
I put in estimates for them to size my prop and thier program suggests perhaps adding some pitch. Closest size I see to try for me is a 15X15X3 which sells for $87.75 for a Yamaha hub assembly and three blades. Extra blades are $10.13 each. Looks like not any good options for me so if this one did not work well so would return it.
Any experience out there with Piranha?
http://www.piranha.com/
Seems to me easier to store three blades as a spare instead of a conventional prop, maybe could repair in the water and the guarantee looks interesting.
"We long ago realized that it isn't possible to predict with 100% accuracy how well a particular propeller will be matched to an particular boat/motor/useage combination. To make sure you get what you need we offer our blade exchange program. If the propeller isn't working right, you can arrange to exchange the blades for a different size until the boat is functioning to your satisfaction. That's an offer you won't find from any metal propeller maker. That's one more reason Piranha is the superior Boat propeller choice.
If we can't get you the propeller you need, we'll get you your money back
-- Guaranteed. "
I put in estimates for them to size my prop and thier program suggests perhaps adding some pitch. Closest size I see to try for me is a 15X15X3 which sells for $87.75 for a Yamaha hub assembly and three blades. Extra blades are $10.13 each. Looks like not any good options for me so if this one did not work well so would return it.
Any experience out there with Piranha?
Ranger Tim
Well-known member
I have no direct experience with composite props. There has been much criticism of them that I have heard, but I'm not one to slam something without direct experience. Keep us posted with your results if you follow through with it.
Casually strafing an oyster bar at idle is no biggie for a steel prop, yet more common than I care to recount - especially when the Admiral is driving :roll:
I'm not sure the composite would be resilient to this type of mild abuse!
Casually strafing an oyster bar at idle is no biggie for a steel prop, yet more common than I care to recount - especially when the Admiral is driving :roll:
I'm not sure the composite would be resilient to this type of mild abuse!
JC are those numbers from your own tests or from published yamaha data? As noted earlier in this thread, test data from both Parker and Yamaha indicate very different results although test conditions were almost identical. Spoke to both Parker and Yamaha and neither could explain.
Ray
Ray
when I started this post I was concerned that the prop ....14 1/4 by 16 polised ss...Parker was putting on the 2120 SC with the 150 hp 4 stroke was not the best prop as indicated by the Yamaha test results. The test results indicated that the 13 3/4 by 17 black steel prop was much better and, at cruse at about 4500 rpm and 30.4 mph, gave about 25 % better fuel consumption at 3.75 mpg.
Well I ran some tests with the 13 3/4 prop and found that the Yamaha test results were very close to mine. Mine was conducted with typical boating conditions ...surface chop, with tide/ wind, against tide/ wind, some days calm while most with white caps and at least 2/3 tank of fuel with fishing gear , chum etc. The results were the average of the readings with over 3 dozen at the 4200- 4500rpm range. The engine trim was at 4 with Lenco tabs retracted. Speed using Garmin GPS and fuel using Navman fuel meter. I found the tabs would reduce rpms by 100 to 200.
Mine 13 3/4 ........................Yamaha 13 3/4
rpm mph mpg ................ rpm mph mpg
1000 4.18 8.95 ............... 1000 4.2 7.0
1200 4.89 7.52 ................ na
1500 6.01 6.46 ................ 1500 6.0 6.0
3600 16.33 2.63 ................ na
4000 24.3 3.63 ................ 4000 24.8 3.54
4200 25.76 3.56 .............. na
4300 27.51 3.63 .................... na
4400 28.12 3.51 ............,..... na
4500 29.67 3.57 .................... 4500 30.4 3.75
5500 38 2.6 .................... 5500 39.4 2.76
By way of comparison the Yamaha tests with the 141/4 polished ss indicated the best fuel economy at 4000rpm, 25.6 mph at 3.28 mpg. And at 4500rpm the results were 29.6 mph at 3.02 mpg. So If you cruse at 4500rpm with the 14 1/4 prop expect to burn at least .52 to .73 gph more or about 15 -25 % more as compared to the 13 3/4 black steel prop.
One of these days I'll run my own tests with the 14 1/4 prop and let you folks know the results.
Ray
Well I ran some tests with the 13 3/4 prop and found that the Yamaha test results were very close to mine. Mine was conducted with typical boating conditions ...surface chop, with tide/ wind, against tide/ wind, some days calm while most with white caps and at least 2/3 tank of fuel with fishing gear , chum etc. The results were the average of the readings with over 3 dozen at the 4200- 4500rpm range. The engine trim was at 4 with Lenco tabs retracted. Speed using Garmin GPS and fuel using Navman fuel meter. I found the tabs would reduce rpms by 100 to 200.
Mine 13 3/4 ........................Yamaha 13 3/4
rpm mph mpg ................ rpm mph mpg
1000 4.18 8.95 ............... 1000 4.2 7.0
1200 4.89 7.52 ................ na
1500 6.01 6.46 ................ 1500 6.0 6.0
3600 16.33 2.63 ................ na
4000 24.3 3.63 ................ 4000 24.8 3.54
4200 25.76 3.56 .............. na
4300 27.51 3.63 .................... na
4400 28.12 3.51 ............,..... na
4500 29.67 3.57 .................... 4500 30.4 3.75
5500 38 2.6 .................... 5500 39.4 2.76
By way of comparison the Yamaha tests with the 141/4 polished ss indicated the best fuel economy at 4000rpm, 25.6 mph at 3.28 mpg. And at 4500rpm the results were 29.6 mph at 3.02 mpg. So If you cruse at 4500rpm with the 14 1/4 prop expect to burn at least .52 to .73 gph more or about 15 -25 % more as compared to the 13 3/4 black steel prop.
One of these days I'll run my own tests with the 14 1/4 prop and let you folks know the results.
Ray
