17' MA with a 115 Yamaha 4-stroke- Prop

[C-Los]

I'm thinking my boat is still under-propped. My MA 17' with a 4-stroke Yamaha runs WOT 5100 at 41MPH. Shouldn't I be able to hit 5900rpm's 45-47MPH?

[geeviam]

7 hours ago, C-Los said:

I'm thinking my boat is still under-propped. My MA 17' with a 4-stroke Yamaha runs WOT 5100 at 41MPH. Shouldn't I be able to hit 5900rpm's 45-47MPH?

What is the make, model, diameter and pitch of your prop?

[Wanaflatsfish]

19 hours ago, C-Los said:

I'm thinking my boat is still under-propped. My MA 17' with a 4-stroke Yamaha runs WOT 5100 at 41MPH. Shouldn't I be able to hit 5900rpm's 45-47MPH?

Most yamadogs rev limit is 6100...so, yes, you seem to be a bit over prop'd only hitting 5100...the WOT on my 2 smoker is at 5200 and I'm at 35-37 depending on the load if perfectly trimmed out....

are you running a 4 blade or 3?  again, as mentioned above, prop info would help.  Who prop'd it for you?

I hope to never loose my MA17's 1995 two stroker...but, can you send a couple of pics along..love to see how it's set up.

 

[FLDXT]

Call Marcus at Powertech.

[Wanaflatsfish]

On 4/6/2019 at 10:00 AM, C-Los said:

I'm thinking my boat is still under-propped. My MA 17' with a 4-stroke Yamaha runs WOT 5100 at 41MPH. Shouldn't I be able to hit 5900rpm's 45-47MPH?

Any updates ?

 

dc

 

[C-Los]

It's a PowerTech- YM90RED3R19P

[geeviam]

32 minutes ago, C-Los said:

It's a PowerTech- YM90RED3R19P

Unless your boat is loaded heavy, or the motor mount height is off, you should be getting more RPM out of that prop.  Best advice is to call Marcus at Powertech Propeller.

[C-Los]

Spoke with Marcus at ProTech. He recommended the PTR3R17PYM90- port 3/8".

He's an amazing wealth of knowledge. Thanks for the recommendation. 

 

[geeviam]

Sounds great!  Marcus is very good at his job.  Go with what he recommends, and you'll save yourself a lot of trial and error.