4 blade prop 300 Yamaha

KKRCRACE

Well-known member
Joined
Oct 2, 2018
Messages
245
Fluid Motion Model
C-242 C
Hull Identification Number
FMLS2448C818
Vessel Name
Sunny Daze
I have a C 242 with a 300 hp Yamaha and I’m interested in a 4 blade prop. Has anyone tried one? If so, I would like to know your opinions. Thanks
KKRCRACE
 
We just purchased a 4 blade prop for our 2017 C 242 with the 300 Yamaha, but have yet to make the swap. I know that’s not very helpful, but we’re hoping to get to it this weekend…
 
I put a 4 blade on my F300 on an RT27-OB.

The 4 blade should help with hole shot, low speed maneuvering and docking and improve stern lift. It’ll drop the top end speed a little and will cost some in fuel efficiency.

On a c24 that’s a lighter boat than the RT27, I guess it would depend on what you’re looking to achieve by upgrading to a 4 blade.


Sent from my iPhone using Tapatalk
 
I am looking to achieve better performance and fuel efficiency in the 3700 to 4500 rpm range and I would also like to be able to keep the boat up on plane at a lower speed. Thanks
KKRCRACE
 
KKRCRACE":2w25oyjc said:
I am looking to achieve better performance and fuel efficiency in the 3700 to 4500 rpm range and I would also like to be able to keep the boat up on plane at a lower speed. Thanks
KKRCRACE

I’ll let you know how if we see some of these improvements.

We’re in the Pacific Northwest and purchased from https://www.tacomapropeller.com/.
 
Submariner":3q8ka3qu said:
I put a 4 blade on my F300 on an RT27-OB.

The 4 blade should help with hole shot, low speed maneuvering and docking and improve stern lift. It’ll drop the top end speed a little and will cost some in fuel efficiency.

On a c24 that’s a lighter boat than the RT27, I guess it would depend on what you’re looking to achieve by upgrading to a 4 blade.


Sent from my iPhone using Tapatalk

We finally got the prop on and have been out a couple of times in very good water. Basically, noticed the above…except our fuel efficiency was just slightly better. Likely not enough to justify buying the prop if that was the only objective. We were able to stay on plane at lower speeds and it was noticeably quieter. No complaints and now we have a spare prop.
 
Eagerkr,
Could you give me the pitch, diameter on the prop, the manufacturer and who you purchased it from.
Thanks,
KKRCRACE
 
Here are the details from the box…

Brand: PowerTech
Universal Propellar
Class E - 4.75" Gearcase
135 HP TO 350 HP
Diameter: 15.25
Pitch:17
Blades: 4
Rotation: R
Metal: SS
Part #: OFS4R17PCL200
 
eagerkr":27we1a7g said:
Here are the details from the box…

Brand: PowerTech
Universal Propellar
Class E - 4.75" Gearcase
135 HP TO 350 HP
Diameter: 15.25
Pitch:17
Blades: 4
Rotation: R
Metal: SS
Part #: OFS4R17PCL200

We purchased from a local prop shop: https://www.tacomapropeller.com/
 
Thanks for the information.
KKRCRACE
 
Eagerkr
What was your top speed and WOT rpm with your new 4 blade prop?
KKRCRACE
 
KKRCRACE":ox3dphfh said:
Eagerkr
What was your top speed and WOT rpm with your new 4 blade prop?
KKRCRACE

Took a while to get this with flat water and not a bunch of people on the boat. Here are the stats With 2 adults, 1 70lb dog, 1/4 tank of water, and about 1/2 tank of fuel.

RPM: 5600
Speed: 41.5 knots
Fuel Economy: 1.51 nm/gal

Hope that helps!
 
Thank you very much for the information.
KKRCRACE
 
41.5 knots or 41.5 mph? - idk but the first one seems awfully fast for a 24 foot boat.
 
I have been able to get 50 mph out of my C24 on a good day with motor trimmed and proper water. There have also been times that I could only get 46 mph out of her. That is with the factory prop. If I see 5700 rpm I know it’s running 49 mph give or take.
KKRCRACE
 
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