Improvement with EcoEnertia 17p over current?

[InterMechanico]

I decided to measure my prop slip today. Here's what I found. I've been considering trying a 3 blade EcoEnertia 17p. Should I expect any improvement in efficiency based on my current numbers? I am slightly overpropped at the moment, which is why I'm considering a new prop.



Normal WOT range for my engine is 5300 - 5800







 

[MikePA]

I decided to measure my prop slip today. Here's what I found. I've been considering trying a 3 blade EcoEnertia 17p. Should I expect any improvement in efficiency based on my current numbers? I am slightly overpropped at the moment, which is why I'm considering a new prop.



Normal WOT range for my engine is 5300 - 5800







Is it the same diameter?

 

[Flashman]

For what it's worth I have the same outboard on an 18' whaler outrage, same top speed and top end RPM as you. I'm running a 14.5" 17P Enertia. I tried a 17P Eco, got worse fuel economy.

 

[InterMechanico]

Is it the same diameter?

I think the eco is 16"

 

[MikePA]

I think the eco is 16"

Likely too big. Even going from 4 blade to three..

 

[InterMechanico]

@ship happens weren't you saying at one point that the larger diameter the better?

 

[ship happens]

@ship happens weren't you saying at one point that the larger diameter the better?

Don't think I've ever said that specifically, however more surface area means more grip.

 

[BCI]

Can you get your hands on the regular Enertia 17 instead of the EcoEnertia 17?

I think the Eco will be too much ask for your engine. The three blade regular Enertia might spin where you want it.