Standard prop for 2009 R25 with Cummins 150 inboard

[bartmac]

Can someone tell me the propeller diameter, pitch & cupping that was standard on the 2009 R-25s ?
Thanks!

 

[scross]

Don’t know if this will help since we have the 150 Yanmar 4BY2 engine, but on our 2009 R-25 Classic, the prop is a 17X14 with .105 cup. Acme 1390.

 

[Bob B.]

My 2014 R25 SC has the same Prop as Al and his 2009 Yanmar. Our engine is a Volvo 150 D3.

 

[Seakr25]

My 2008 R25 Classic with Cummins 130HP , repowered from Cummins 150HP original has a 17x12 pitch .105 cup .... I believe it was reduced from stock 17x14 pitch after the repower if that helps.

 

[peterd@btsi.tv]

I too have a 2009 R25 classic with the same engine. I do not have the prop data in front of me as it is in the boat.

However I do know that it is the original. When I purchased the boat I could not reach the WOT range specified by the engine manual (apprx 3500 RPM). From all appearances and from reading various posts on this site it looked like I had too much prop and was loading the engine excessively despite the engine diagnostics saying otherwise.

After a little testing and research the problem turned out to be very simple. The engine service manual indicates that it requires 2.75" of range on the throttle movement. Mine was only going 2.25" before the control arm hit the mounting base wood. To fix this I removed the control arm and positioned it one notch further back on the shaft so that neutral is now back about 15 degrees rather than straight up. This gives me the full 2.75" range required.

The boat now easily reaches WOT of 3500 (16.6 kts) with a moderate load (full fuel, empty water, empty waste and one person) and a new hard paint bottom job. Water was calm, no wind. Tested on a lake so no tide or current influence either.

Just want to throw that out in case that was what you were fighting.

 

[Seakr25]

That’s an interesting bit of info about the throttle throw. I’ll have to check mine now. Thanks.

 

[NorthernFocus]

The original 2009 models came with either a 17x15/.105 cup or 17x14/.105 cup. The original performance "test" that was publicized was with the 17x15. If I recall the test was done with half tank of fuel, half water, empty holding tank, and two people on board. The performance data was quite impressive. But if the boat is loaded for cruising both options are too much wheel.

 

[NorthernFocus]

That’s an interesting bit of info about the throttle throw. I’ll have to check mine now. Thanks.

The Mercruiser panel indicates percent throttle. On the Cummins/Mercruiser engines the throttle is electronic. The mechanical linkage moves an actuator but the control is electronic. So the percent reading on the panel is the actual throttle position.

 

[FLMan]

I recently purchased a 2009 R-25 with the Cummins/Mercruiser 150 HP engine. The survey indicated that the engine was working well, however, when lightly loaded and clean bottom, I can't get above 10.5 kts.@ 3500 RPM. Wondering if the prop is the culprit. Any advice on trouble shooting lousy performance?

 

[BB marine]

I recently purchased a 2009 R-25 with the Cummins/Mercruiser 150 HP engine. The survey indicated that the engine was working well, however, when lightly loaded and clean bottom, I can't get above 10.5 kts.@ 3500 RPM. Wondering if the prop is the culprit. Any advice on trouble shooting lousy performance?

Does that mean when you surveyed the engine Max RPM was 3500 rpm? Or the speed at 3500 rpm is 10.5 Kts? I believe that engine should turn 4000 rpm @ WOT + 3% on a lightly loaded boat. My opinion is anything less than 4000 rpm is an over propped boat and the engine surveyor would have stated that this is an issue with advisement to report. Or indicated possible issues that would cause for poor engine performance if he indeed considered the low engine rpm. I am surprised that a surveyor considered an engine to be working well when the max rpm is 500 rpm below manufactures recommendation.

(If that is the question you have in your post? " I can't get above 10.5 kts.@ 3500 RPM."