re prop QSD150

[Tug@myHeart]

Looks like i posted on Chat and should have posted in Ask the factory.

I need to re prop my 2009 QSD150 Cummins. For Lake Tahoe.

Please give me a contact in parts to order the correct prop.

Thanks Reno

 

[Kenny Marrs]

Hello Reno,

The easiest thing to do would be to email parts@rangertugs.com.

Thanks,
-Kenny

 

[Levitation]

I am a bit puzzled. What is there about the water in Lake Tahoe that requires a different prop?
Tugs run in fresh water all the time with the factory prop.
Tahoe is at 6000 feet. But, your engine is ECM controlled and turbo charged which will (or should) compensate for that.

 

[thataway]

A gas engine will loose 2 to 4 % HP per each 1000 feet of elevation. The tubro diesel is closer to .5 to 1% per 1000 feet. If you are going to be running at displacement speeds, then you will not notice any difference at Tahoe. If trying to get 17 knots--there may be some effect--but I don't think it would be worth the cost of a new prop--or re-pitching unless it is a permant move. If a permant move, then dropping the pitch 2" would be the most you would do--and that depends on what your WOT RPM is where you are currently. I would run the boat first before re-pitching and see if you can reach WOT as per specs. Edit--I noted your prior post stating that you can only get 3300 RPM--and should be getting 3900 at WOT. 1" prop drop will give you 200 RPM improvement. Theoretically you can re-pitch the prop by 3" and get the 3900 RPM. Any good prop shop can do this--but I would also deal with a shop which has "prop scan" a computer scan of the prop, so it is perfectly balanced.

Also be sure that the bottom is clean--and that you don't have any more gear/water/fuel than necessary. All of these will contribute to a slower speed.

 

[walldog]

Thataway is correct. Willie's Tug sat at our dock in the water not on the lift for about 3 weeks. I noticed a few barnacles on the trim tabs and a couple on the rudder. What I did not see was that the bottom of the trim tabs had an even coat of the little buggers. My top end had dropped over 5 knots and my WOT RPM was about 3500. Cleaning them off brought things back up to normal. This was in Texas Gulf Coast where the extra salinity of our bay and the warm temperatures make them very aggressive. Point is a little growth can make a huge difference in performance.

 

[bbrh842]

Barnacles on the propeller are the worst.

 

[Tug@myHeart]

Thanks again for the xtra input. We will buy the extra prop for Tahoe since we are here every year with intentions of going to the 2014 PNW get togethers (at sea level)
.
Yes we have a ratio problem. The bottom is brand new and everything was clean as a whistle on the exterior parts. After Talking to Andrew it does sound like I will want a 2nd prop just for Tahoe. The fresh water is not the issue its the Elevation. 75% throttle with 98%load and past that is just black smoke. Hull speed is ok but anything over that is a problem. Not so much trying to get to 17mph, but when the wind starts howling you must run for cover as fast as your little prop can take you. Like yesterday we were doing a Tahoe round trip and about 3pm the wind went to 30 mph on the water with no notice (like it does all the time) . Your only choice is to RUN into the wind for the Lee shore.
.
The ECM is not cutting it, if that is what it is supposed to do, is retune the motor for 6000ft.

Tks Reno