Outrage 19: New Propeller Improves Top Speed

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Author Topic:   Outrage 19: New Propeller Improves Top Speed

kgregg posted 05-27-2003 03:45 PM ET (US)
On a glass-like Chester River on the eastern shore or Maryland this past Saturday, my 1991 Outrage 19 with Mercury 135-HP turning a 14x19 aluminum propeller to approximately 5,700-RPM at full throttle with two on board whose total weight was about 300-lbs, and with 30-gallons of fuel and not much else, reached 42-MPH as measured by a Etrex GPS. Last year, using [a different] aluminum propeller [whose dimensions might have been 15 x 21], [maximum speed was] 38-MPH. Thanks to expert advise on this site, I have better propeller and a good spare. Cheers, Kevin.
Sal DiMercurio posted 05-27-2003 05:34 PM ET (US)
One of the reasons you are doing better with the 14 x 19 is the one-inch less diameter--absolutely no reason for a 15-inch diameter for a 19-foot boat. Just like most of the guys right here on this site running 14-inch diameter on a 70-hp on a 17-foot Montauk, where a 12.25-inch diameter propeller would be just fine, allowing the engine to twist more pitch, thus more speed. Another reason you are getting more speed from the lesser pitch prop 19 from the 21 pitch is you are allowing that engine to wind up to its maximum speed range of 5,700-RPM. From what you describe, the 14 x 19 is twisting at 5,700-RPM, the 15 x 21 was lucky to twist at 5,000 to 5,200 maximum, anywhere from 500 to 700-RPM less then the 14 x 19. More pitch in your propeller doesn't always mean more boat speed, it only applies if the engine can twist that pitch to its max RPM range; if it can't, you are straining the engine and going slower.
Sal
458steve posted 09-18-2010 07:23 PM ET (US)
[Gave information about the performance of a different boat and motor.]
jimh posted 09-19-2010 09:04 AM ET (US)
Thanks for the performance data on your OUTRAGE 19. Owners of MONTAUK 17 boats who want to discuss their performance should begin a separate discussion. Thanks.
Tohsgib posted 09-19-2010 11:55 AM ET (US)
You did not get good info from this forum on that prop. Reason being I don't know anyone who would recommend an aluminum prop to enhance performance. If you put a good SS prop on there you might see 44.
bloller posted 09-19-2010 07:20 PM ET (US)
The Chester River is my home water. What part of the river do you cruise on? The current in the river at times will can give you +/- 2mph depending on which way you are travelling.
As others have suggested, there is no reason why you should not be running a stainless steel propeller for even better performance. The bottom throughout the river is primarily mud so no need to worry about damaging prop or motor if striking bottom with a stainless. It can go from 30' to 1' really fast in some areas especially at low tide. Believe me I have struck bottom many times with my prop and had it been an aluminum it would be time for another prop.
Tom W Clark posted 09-20-2010 08:28 PM ET (US)
You can do a lot better than a 14" x 19" aluminum propeller on your boat.
Search the archives; a good stainless steel propeller can be had for only two or three times what you paid for the aluminum and it will last a lot longer than two or three times the life of the aluminum.
In the long run, you will be dollars ahead with Stainless Steel.

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Author	Topic: Outrage 19: New Propeller Improves Top Speed
kgregg	posted 05-27-2003 03:45 PM ET (US) On a glass-like Chester River on the eastern shore or Maryland this past Saturday, my 1991 Outrage 19 with Mercury 135-HP turning a 14x19 aluminum propeller to approximately 5,700-RPM at full throttle with two on board whose total weight was about 300-lbs, and with 30-gallons of fuel and not much else, reached 42-MPH as measured by a Etrex GPS. Last year, using [a different] aluminum propeller [whose dimensions might have been 15 x 21], [maximum speed was] 38-MPH. Thanks to expert advise on this site, I have better propeller and a good spare. Cheers, Kevin.
Sal DiMercurio	posted 05-27-2003 05:34 PM ET (US) One of the reasons you are doing better with the 14 x 19 is the one-inch less diameter--absolutely no reason for a 15-inch diameter for a 19-foot boat. Just like most of the guys right here on this site running 14-inch diameter on a 70-hp on a 17-foot Montauk, where a 12.25-inch diameter propeller would be just fine, allowing the engine to twist more pitch, thus more speed. Another reason you are getting more speed from the lesser pitch prop 19 from the 21 pitch is you are allowing that engine to wind up to its maximum speed range of 5,700-RPM. From what you describe, the 14 x 19 is twisting at 5,700-RPM, the 15 x 21 was lucky to twist at 5,000 to 5,200 maximum, anywhere from 500 to 700-RPM less then the 14 x 19. More pitch in your propeller doesn't always mean more boat speed, it only applies if the engine can twist that pitch to its max RPM range; if it can't, you are straining the engine and going slower. Sal
458steve	posted 09-18-2010 07:23 PM ET (US) [Gave information about the performance of a different boat and motor.]
jimh	posted 09-19-2010 09:04 AM ET (US) Thanks for the performance data on your OUTRAGE 19. Owners of MONTAUK 17 boats who want to discuss their performance should begin a separate discussion. Thanks.
Tohsgib	posted 09-19-2010 11:55 AM ET (US) You did not get good info from this forum on that prop. Reason being I don't know anyone who would recommend an aluminum prop to enhance performance. If you put a good SS prop on there you might see 44.
bloller	posted 09-19-2010 07:20 PM ET (US) The Chester River is my home water. What part of the river do you cruise on? The current in the river at times will can give you +/- 2mph depending on which way you are travelling. As others have suggested, there is no reason why you should not be running a stainless steel propeller for even better performance. The bottom throughout the river is primarily mud so no need to worry about damaging prop or motor if striking bottom with a stainless. It can go from 30' to 1' really fast in some areas especially at low tide. Believe me I have struck bottom many times with my prop and had it been an aluminum it would be time for another prop.
Tom W Clark	posted 09-20-2010 08:28 PM ET (US) You can do a lot better than a 14" x 19" aluminum propeller on your boat. Search the archives; a good stainless steel propeller can be had for only two or three times what you paid for the aluminum and it will last a lot longer than two or three times the life of the aluminum. In the long run, you will be dollars ahead with Stainless Steel.