208 Adventure Yam 150 Prop Advice

[Biscayne208]

Hey guys, I need to buy a new prop for my 93' 208 with a yamaha 150 precision blend. GW shows the 150 four stroke performance report with a 13 3/4 x 17 pitch with good numbers but I am unsure as to whether my 2 smoke will perform the same with that prop.

What are you guys running on a similar setup?

Thanks in advance,

Ed

 

[fishermanaddict]

What RPM are you getting? I have 1999 209 Escape with 150hp Yamaha Saltwater Serie II . I was running Yamaha prop 17M 13.75 X 17 Pitch get 5000rpm at 4000rpm get 30mph 5000rpm get 40mph . I switch to Powertech 3 blade stainless. 14.25 X 15pitch increase to 5500rpm . at 4000rpm get 30mph 5500 get 40mph. I really don't know what percent slip is.

 

[Biscayne208]

Fisherman,

You were able to maintain the same 30 mph cruise? Thats great. I would think that the powertech would be better as if you have more weight you can still reach the higher rpm under load..

 

[fishermanaddict]

I thought if I change to new prop the speed will reduce . I don't even know why at 4000 rpm I still get 30mph. Maybe some of the members on this site might know. I have noticed my hole shot and plane much quicker.

 

[seasick]

What RPM are you getting? I have 1999 209 Escape with 150hp Yamaha Saltwater Serie II . I was running Yamaha prop 17M 13.75 X 17 Pitch get 5000rpm at 4000rpm get 30mph 5000rpm get 40mph . I switch to Powertech 3 blade stainless. 14.25 X 15pitch increase to 5500rpm . at 4000rpm get 30mph 5500 get 40mph. I really don't know what percent slip is.

Your slip is about 7% at 5500 revs. Half that at 4000 revs. This calculation is based on a 1.82 LU ratio which I think is correct for that motor.
The slip on the old prop at 5000 revs was about 10%. At 4000 revs the slip was almost 18 % ( verry high,I wonder if the prop was damaged)

The new prop is apparently a much better performer.

 

[fishermanaddict]

Thanks Seasick, What is the maximum percent slip consider within the range for best performance?

 

[seasick]

Thanks Seasick, What is the maximum percent slip consider within the range for best performance?

That's hard to say but over 10% is a concern. Ideally your slip would be 0 for best performance but that's not going to happen in the real world.
I would be happy with anything under 8%