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Author Topic:   E-TEC 115 Propeller Selection

danimal44 posted 05-28-2007 11:55 AM ET (US)
We recently purchased a brand new Hurricane fun deck boat and powered it with an E-TEC 115-HP. I know it is not a Boston Whaler boat, but I was wondering if you guys could point me in the right direction for a stainless propeller. The motor is mounted at the correct height: cavitation plate about 2-inches above keel. The boat is 18-feet and weighs 2,150-lbs dry. Right now with a 13-1/2 x 15 BRP aluminum prop I can get 41-MPH and 5,800 trimmed all the way out with just me. By the way we love the motor. Thanks again.
jimh posted 05-28-2007 02:32 PM ET (US)
Look up your gear ratio. Your gear ratio is either 2.0:1 or 2.25:1, depending on the model.
If you're turning a 13-1/2-inch pitch propeller, there is no way you are making 41-MPH. Something is off. Check you speed again.
With 2:1 gears, a 13-1/2-inch pitch propeller only makes about 33-MPH at 5,800-RPM. Your reported speed is fantastic--literally.
Tom W Clark posted 05-28-2007 03:40 PM ET (US)
jim,
The pitch 15" not 13-1/2". 41 mph with a cupped 15" propeller is certainly possible.
jimh posted 05-29-2007 08:31 AM ET (US)
I am surprised that a V4 Evinrude only swings a 13-1/2-inch diameter propeller. I thought they used the V6 gear case on that motor, like they do on the 90-HP E-TEC, which can swing the larger diameter propellers. On a deck boat, you'd think that you'd be better off with a large diameter propeller.
If this thing really goes 41-MPH, then I am quite impressed. I will wave as he goes by me in my 22-foot Whaler with 225-HP. I can only hit that speed on a good day, light load, and down wind.
Tom W Clark posted 05-29-2007 10:17 AM ET (US)
The 90 HP Evinrude E-Tec does not use a V-6 gearcase. I do not belive the 115 HP E-Tec does either. A 13-1/2" diameter prop is quite typical for both of these motors.
danimal44 posted 05-29-2007 10:21 AM ET (US)
[T]he speed is not a [GPS] reading, just the [speedometer]. [H]owever it [definitely] feels way faster than our old boat. [Inquires if Bombardier] makes a 13-1/2 x 15 stainless [steel propeller]. [I] couldn[']t find any on the [E]vinrude parts site. [A]ny input is much appreciated[.]
danimal44 posted 05-29-2007 10:23 AM ET (US)
[A]lso, the gearing is 2.0:1. It is a 2-inch shaft motor.
Tom W Clark posted 05-29-2007 10:41 AM ET (US)
BRP makes two (three actually) stainless steel propellers that are comparable in sizing to your aluminum prop.
SST #176571, 13-7/8" x 15" (swept blades)
SST #177034, 13-3/4" x 15" (non-swept blades)
Viper #177042 13-7/8" x 15" (polished version of the SST which is painted black)
You could also try the Stiletto Advantage I, 13-1/4" x 15" which many E-Tec owners are using with their Whalers.
danimal44 posted 05-29-2007 11:22 AM ET (US)
[Thanks] for the reply, Tom. What worries me is those three props are all larger than my current prop. [I] wonder how much RPM [I] might lose, and if they will cause me to have [slower acceleration from a standing stop]. [O]ne of the SST propellers was swept blades and one was not. What does that mean[?] Also will have have to get a special adapter if [I] decide to use the Stiletto prop. I have read that many members have had good success with it. [I] just don[']t want to lose many RPM because we frequently have five to six people on board.
Tom W Clark posted 05-29-2007 11:32 AM ET (US)
The non-swept blade design is an older design dating back to when the OMC SST was introduced in the late 1970s. Do not let that fool you. It still performs very well on some boats. The swept blade design is more contemporary and in should be better in some circumstances.
In testing on an E-Tec powered Montauk and an E-Tec powered Sport 15, a old 17" OMC SST (non-swept) prop was compared to a 15" Stiletto. The SST was only slightly slower than the Stiletto when used on the Montauk and was slightly faster when used on the Sport 15. I have no explanation for that differnece between the two boats.
No, I do not think the "size" is much different than what you have. Do not look at diameter as all-definitive. If the blade area is less yet the diameter larger, they may actually allow greater RPM.
No, you do not need any adapter when you use a Stiletto hubbed for OMC or BRP motors. But given that a 15" Stiletto will perform like a 17" BRP, that may be too much prop for your boat. A 15" is the lowest pitch made in the Advantage I line. As an alternative you can use Turbo's Turbo 1 in the 13-1/4" x 13". This is a slightly more expensive prop, but should be slightly faster too.
danimal44 posted 05-29-2007 11:46 AM ET (US)
[Thanks] again, Tom. Our neighbor also recently just took delivery of a new Hurricane deck boat. It is larger and heavier than ours and the hull is different. He is pushing 43-MPH. His is a white motor and has a Viper prop on it. It did not have any numbers however. I would say it almost has to be that 13-7/8 x 15. Ill just have to find out if his motor is a 25in shaft.
Kopperking posted 06-03-2007 10:20 PM ET (US)
I also own a 2006 Hurricane Fundeck 196REF with a 115-HP E-TEC motor. I am currently using an Apollo SS prop 13-1/4 x 17, and can achieve 40-MPH (Speedo) at 5,000-RPM with a crew of six, full tank (30 gallons), and gear on a calm waters. I've been wondering if I shoud DROP to a 15 to get my engine speed higher.
danimal44 posted 06-04-2007 07:27 PM ET (US)
i would recomend going to a 13 1/2 x 15 brp aluminum. That is what we have on now and i can turn 5800 by myself light load. Ive read alot of places that these motors should run in their uppers recomended range 5500-6000
Kopperking posted 06-05-2007 07:20 AM ET (US)
This is the part, I don't get.
High RPMs are Bad for a 4-cycle motor (Car/Truck), but a 2-cycle - High is Good?
I don't cruise much faster than 30 mph. Does that make a difference? (Can you tell I'm a 'new' Boat owner?)
-I don't mean to "jack" your Thread, I've been "lurking" this site for my answers, since last August (when I got my boat), It seems THIS is the Most active Boating Forum on the 'net.
Peter posted 06-05-2007 08:10 AM ET (US)
Kopperking -- The general rule of propping for all outboard motors (2 or 4-stroke) is to select a propeller that allows the motor to achieve a WOT RPM in the upper half of the WOT operating range as the boat is normally loaded. For a motor that has a 5000 to 6000 RPM WOT operating range, ideally the motor should be propped so that when the boat is fully loaded with fuel, people and gear, the motor runs at least 5500 RPM at WOT. When the boat is lightly loaded, chances are that the motor will run several hundred RPM higher but be below 6000 RPM.
You could work prop selection backwards and find a prop that would allow the motor to run close to 6000 RPM (assumes 6000 RPM max) with a very light load. When the boat is loaded down at or near the maximimum, the motor will turn several hundred RPM less at WOT due to the extra load.
Even if you never run the motor at WOT, this is the way to select a propeller. The reason for doing it this way is to make sure that the motor is not overworked at any RPM. Having too much pitch on an outboard even at cruising speeds of 30 MPH or less is not a good thing.
danimal44 posted 06-05-2007 07:29 PM ET (US)
No problem at all. You do have your motor overpropped. Try the BRP 13 1/2 x 15 aluminum. I think your will be shocked at the increase in hole shot and you might gain a little top end. I saw a performance reports of the exact same boat i have with a yamaha f115 and it would go 38.5 mph. I am going 41 mph "speedo" and my neighbor is getting 43 on a larger boat than ours. It is a strong 115.
Kopperking posted 06-06-2007 01:55 AM ET (US)
Wouldn't Stainless Steel be better?
Tom W Clark posted 06-06-2007 07:53 AM ET (US)
Kopperking,
Yes, stainless steel is MUCH better.
Kopperking posted 06-06-2007 09:26 AM ET (US)
Thanks for the info.
-I'm also researching (trying to find) the Etec Interface, so that I can hook my motor to a laptop, and keep tabs on it. W/O driving 150 miles to my nearest Stealership, to get it checked.
-But that may be Another Thread....
Skipjack 17 posted 06-06-2007 11:05 AM ET (US)
Currently running a 13-7/8"-19 Viper on our 17" Outrage I and holding 48 MPH at 5600 RPMS with our 115 E-TEC……….Bob

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Author	Topic: E-TEC 115 Propeller Selection
danimal44	posted 05-28-2007 11:55 AM ET (US) We recently purchased a brand new Hurricane fun deck boat and powered it with an E-TEC 115-HP. I know it is not a Boston Whaler boat, but I was wondering if you guys could point me in the right direction for a stainless propeller. The motor is mounted at the correct height: cavitation plate about 2-inches above keel. The boat is 18-feet and weighs 2,150-lbs dry. Right now with a 13-1/2 x 15 BRP aluminum prop I can get 41-MPH and 5,800 trimmed all the way out with just me. By the way we love the motor. Thanks again.
jimh	posted 05-28-2007 02:32 PM ET (US) Look up your gear ratio. Your gear ratio is either 2.0:1 or 2.25:1, depending on the model. If you're turning a 13-1/2-inch pitch propeller, there is no way you are making 41-MPH. Something is off. Check you speed again. With 2:1 gears, a 13-1/2-inch pitch propeller only makes about 33-MPH at 5,800-RPM. Your reported speed is fantastic--literally.
Tom W Clark	posted 05-28-2007 03:40 PM ET (US) jim, The pitch 15" not 13-1/2". 41 mph with a cupped 15" propeller is certainly possible.
jimh	posted 05-29-2007 08:31 AM ET (US) I am surprised that a V4 Evinrude only swings a 13-1/2-inch diameter propeller. I thought they used the V6 gear case on that motor, like they do on the 90-HP E-TEC, which can swing the larger diameter propellers. On a deck boat, you'd think that you'd be better off with a large diameter propeller. If this thing really goes 41-MPH, then I am quite impressed. I will wave as he goes by me in my 22-foot Whaler with 225-HP. I can only hit that speed on a good day, light load, and down wind.
Tom W Clark	posted 05-29-2007 10:17 AM ET (US) The 90 HP Evinrude E-Tec does not use a V-6 gearcase. I do not belive the 115 HP E-Tec does either. A 13-1/2" diameter prop is quite typical for both of these motors.
danimal44	posted 05-29-2007 10:21 AM ET (US) [T]he speed is not a [GPS] reading, just the [speedometer]. [H]owever it [definitely] feels way faster than our old boat. [Inquires if Bombardier] makes a 13-1/2 x 15 stainless [steel propeller]. [I] couldn[']t find any on the [E]vinrude parts site. [A]ny input is much appreciated[.]
danimal44	posted 05-29-2007 10:23 AM ET (US) [A]lso, the gearing is 2.0:1. It is a 2-inch shaft motor.
Tom W Clark	posted 05-29-2007 10:41 AM ET (US) BRP makes two (three actually) stainless steel propellers that are comparable in sizing to your aluminum prop. SST #176571, 13-7/8" x 15" (swept blades) SST #177034, 13-3/4" x 15" (non-swept blades) Viper #177042 13-7/8" x 15" (polished version of the SST which is painted black) You could also try the Stiletto Advantage I, 13-1/4" x 15" which many E-Tec owners are using with their Whalers.
danimal44	posted 05-29-2007 11:22 AM ET (US) [Thanks] for the reply, Tom. What worries me is those three props are all larger than my current prop. [I] wonder how much RPM [I] might lose, and if they will cause me to have [slower acceleration from a standing stop]. [O]ne of the SST propellers was swept blades and one was not. What does that mean[?] Also will have have to get a special adapter if [I] decide to use the Stiletto prop. I have read that many members have had good success with it. [I] just don[']t want to lose many RPM because we frequently have five to six people on board.
Tom W Clark	posted 05-29-2007 11:32 AM ET (US) The non-swept blade design is an older design dating back to when the OMC SST was introduced in the late 1970s. Do not let that fool you. It still performs very well on some boats. The swept blade design is more contemporary and in should be better in some circumstances. In testing on an E-Tec powered Montauk and an E-Tec powered Sport 15, a old 17" OMC SST (non-swept) prop was compared to a 15" Stiletto. The SST was only slightly slower than the Stiletto when used on the Montauk and was slightly faster when used on the Sport 15. I have no explanation for that differnece between the two boats. No, I do not think the "size" is much different than what you have. Do not look at diameter as all-definitive. If the blade area is less yet the diameter larger, they may actually allow greater RPM. No, you do not need any adapter when you use a Stiletto hubbed for OMC or BRP motors. But given that a 15" Stiletto will perform like a 17" BRP, that may be too much prop for your boat. A 15" is the lowest pitch made in the Advantage I line. As an alternative you can use Turbo's Turbo 1 in the 13-1/4" x 13". This is a slightly more expensive prop, but should be slightly faster too.
danimal44	posted 05-29-2007 11:46 AM ET (US) [Thanks] again, Tom. Our neighbor also recently just took delivery of a new Hurricane deck boat. It is larger and heavier than ours and the hull is different. He is pushing 43-MPH. His is a white motor and has a Viper prop on it. It did not have any numbers however. I would say it almost has to be that 13-7/8 x 15. Ill just have to find out if his motor is a 25in shaft.
Kopperking	posted 06-03-2007 10:20 PM ET (US) I also own a 2006 Hurricane Fundeck 196REF with a 115-HP E-TEC motor. I am currently using an Apollo SS prop 13-1/4 x 17, and can achieve 40-MPH (Speedo) at 5,000-RPM with a crew of six, full tank (30 gallons), and gear on a calm waters. I've been wondering if I shoud DROP to a 15 to get my engine speed higher.
danimal44	posted 06-04-2007 07:27 PM ET (US) i would recomend going to a 13 1/2 x 15 brp aluminum. That is what we have on now and i can turn 5800 by myself light load. Ive read alot of places that these motors should run in their uppers recomended range 5500-6000
Kopperking	posted 06-05-2007 07:20 AM ET (US) This is the part, I don't get. High RPMs are Bad for a 4-cycle motor (Car/Truck), but a 2-cycle - High is Good? I don't cruise much faster than 30 mph. Does that make a difference? (Can you tell I'm a 'new' Boat owner?) -I don't mean to "jack" your Thread, I've been "lurking" this site for my answers, since last August (when I got my boat), It seems THIS is the Most active Boating Forum on the 'net.
Peter	posted 06-05-2007 08:10 AM ET (US) Kopperking -- The general rule of propping for all outboard motors (2 or 4-stroke) is to select a propeller that allows the motor to achieve a WOT RPM in the upper half of the WOT operating range as the boat is normally loaded. For a motor that has a 5000 to 6000 RPM WOT operating range, ideally the motor should be propped so that when the boat is fully loaded with fuel, people and gear, the motor runs at least 5500 RPM at WOT. When the boat is lightly loaded, chances are that the motor will run several hundred RPM higher but be below 6000 RPM. You could work prop selection backwards and find a prop that would allow the motor to run close to 6000 RPM (assumes 6000 RPM max) with a very light load. When the boat is loaded down at or near the maximimum, the motor will turn several hundred RPM less at WOT due to the extra load. Even if you never run the motor at WOT, this is the way to select a propeller. The reason for doing it this way is to make sure that the motor is not overworked at any RPM. Having too much pitch on an outboard even at cruising speeds of 30 MPH or less is not a good thing.
danimal44	posted 06-05-2007 07:29 PM ET (US) No problem at all. You do have your motor overpropped. Try the BRP 13 1/2 x 15 aluminum. I think your will be shocked at the increase in hole shot and you might gain a little top end. I saw a performance reports of the exact same boat i have with a yamaha f115 and it would go 38.5 mph. I am going 41 mph "speedo" and my neighbor is getting 43 on a larger boat than ours. It is a strong 115.
Kopperking	posted 06-06-2007 01:55 AM ET (US) Wouldn't Stainless Steel be better?
Tom W Clark	posted 06-06-2007 07:53 AM ET (US) Kopperking, Yes, stainless steel is MUCH better.
Kopperking	posted 06-06-2007 09:26 AM ET (US) Thanks for the info. -I'm also researching (trying to find) the Etec Interface, so that I can hook my motor to a laptop, and keep tabs on it. W/O driving 150 miles to my nearest Stealership, to get it checked. -But that may be Another Thread....
Skipjack 17	posted 06-06-2007 11:05 AM ET (US) Currently running a 13-7/8"-19 Viper on our 17" Outrage I and holding 48 MPH at 5600 RPMS with our 115 E-TEC……….Bob