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myjule posted 07-22-2006 11:13 AM ET (US)
Just purchased an 18 outrage 1986 with a 1993 evinrude 150hp. the motor is turning a 14 1/2x19 aluminum prop. i have always used stainless on all of my other boats and i was wondering if i should make the switch to a stainless prop or just be content with the performance i am achieving.
half tank of fuel, wind 10 knots 2 people 2 anchors on bow and portable livwell empty in stern.
3600 24.2 knots converted to 28 mph
4100 26.8 knots converted to 31 mph
5300 37 knots converted to 42.9 mph
i apologize for the lack of data at all RPM's but my cruise is the important thing.
couple noticable things during test:
motor sounds very comfortable in the 3500-3600 range.
bow is higher than expected at cruise and there is a slight porpoising.
cant trim motor up where i would expect to run the boat because the porpoising gets worse and there is noticably more slippage.
under normal conditions i will be carrying a 27 gallon full livewell in the stern
i know of a couple outrage 18 owners who are cruising at 27 knots converted to 31.3 mph at 3500-3600 rpm's
i am in the optimum WOT range which is listed at 4500-5500 so the obvious answer would be just to be happy with what i have, but i am looking to increse my cruising speed at 3500.
any suggestions would be greatly appreciated.

Perry posted 07-22-2006 12:57 PM ET (US)
A good stainless steel prop, perhaps a 14.25 X 17 Stiletto would increse your cruising speed at 3500 RPM. It should also increase your speed at all RPM and improve your hole-shot too.
myakka posted 07-23-2006 09:52 AM ET (US)
myjule
I have the same boat as you with a mercury 150. When I changed propellors from an aluminum 19P to a stainless 19P I gained 4 mph at 3000 rpm. The stainless 19P on my boat works well lightly loaded. I would take Perry's advise and get a 17P propellor.
Mike
Peter posted 07-23-2006 10:27 AM ET (US)
Your calculated propeller slip at WOT is 16 percent, which is high. What brand is the propeller? Your porpoising may be caused by the motor being mounted too low on the transom.
To improve performance, you might consider raising the motor up on the transom by one bolt hole and switching to a stainless steel propeller, such as the 17 or 19 inch pitch Stilletto (you'd have to try them out to see which gets closer to 5500 RPM at WOT), 19 inch pitch Viper, or 19 inch pitch SST.
myjule posted 09-19-2006 02:23 PM ET (US)
thanks for the replies. i havent found anyone who has stiletto advantage II on long island ny so i can demo. i did try the mirrage plus in the 19p which i could only get up to 4900 WOT which is too low. i am going to give the 17p mirage a try.
anyone use both the stiletto and the mirage that can provide me with some feedback.
trying to get a faster hole shot and increase mid range performance as i lug around a livewell under the lean post
The Judge posted 09-19-2006 02:30 PM ET (US)
Not sure if a big heavy prop like the mirage is right but try it. They are more for I/O's and heavier boats like a 22'. How high is engine raised? How does she perform with livewell empty, that is over 200lbs aft full. Redline is 5500 so 5300 is right on but alum stinks so I would say a 14.5x19 SSt would do the trick. I sold my 225 to my friend for parts, I will see if he still has the prop which is mint if you are interested, e-mail me(under $200 delivered).
Tom W Clark posted 09-19-2006 09:57 PM ET (US)
myjule,
You should try a 14-1/4" x 17" Stiletto Advantage II. I can get one of those for $225 delivered, returnable with a restock fee and shipping (admittedly a risk of $40 or so).
The 19" OMC SST II prop that Nick mentions would be an excellent choice as well.
myjule posted 09-20-2006 09:25 AM ET (US)
Tom is that stilletto a speed prop (ie. one that would get my bow up) because i am trying to counteract the bow up scenario and am looking for stern lift.
i have been through 1 prop guy who had me try 5 props none of them worked. i did try a 17 pitch renegade prop and WOT was 5600-5700 which is over my stated rating of 4500-5500. and she had alot of porpoise and tough getting out of the hole.
i am a little nervous going to a 17 pitch because i dont want to over RPM it. but from what i hear about stilletto's they tend to reduce the rpm's because of desiegn and is more comparable to a 19p.
Is this a true statement?
has anyone tried a 19p stilletto on an 18 outrage?
tom your serious i could get a new stainless stilletto for 225 delivered? that sounds like a deal to me
Tom W Clark posted 09-20-2006 09:40 AM ET (US)
A 17" Stiletto Advantage will perform like most 19" pitch props from other manufacturers, that I is why I am recommending it.
You say you have tried five different props. Would you please provide all the speed and RPM data along with any subjective comments you have? That would help us make a solid recommendation.
Having owned an Outrage 18 with a 150 HP OMC motor, I know that is not a boat prone t porpoising...unless something is amiss. How is your motor mounted? How much gear do you have onboard? Where is it located? Do you have a photo of the boat floating in the water?
Don88outrage posted 09-20-2006 10:27 AM ET (US)
"alum stinks so I would say a 14.5x19 SSt would do the trick" got to agree with Nick on this, reason being the SS is a cupped prop, that's the narrow curvature you see along the leading edge which helps to reduce slippage. You won't see this on an alum. prop. Have had several different props on an OMC 150/18' Outrage over the years and the 14.5x19 SS, (original prop when boat was new), performs the best.
Tom W Clark posted 09-20-2006 12:13 PM ET (US)
Virtually all (large outboartd) props sold today are cupped, including aluminum props. The amount of cupping is typicallyh more modest on aluminum props.
The Judge posted 09-20-2006 01:49 PM ET (US)
Friend is not selling his SST.
I agree with Tom that something is amiss with the porpoising thing unless you don't know how to trim it. I can NOT see why a 17, 19, or 21" would be "tough" getting out of the hole on that boat and engine combo. The 2 I have driven, you better be holding on when I nail that throttle or wearing a bathing suit.
myjule posted 09-20-2006 05:22 PM ET (US)
the aluminum is cupped but slips alot so no need to talk about it.
Here are some limited stats
mercury apollo 4 blade 19p
3300 23 knots
WOT 5300 37 knots
alot of vibration which was caused by the swing back of the prop which was less than an inch from the steering tab. it actually wore the paint away. too much vibration
3 blade renegade 17p
3300 22 knots
WOT 5600 37 knots
bow rode too high when planning and i didnt even fill up the livewell
3 blade no name brand double pitch 17p
3300 21knots
wot 5600 37knots
cavitation when planning which i was surprised since it was double pitched and vibration at cruise but it was also a used prop and was beat up a little
mercury mirage plus 19p
3300 25.5 knots
wot 4800-4900 39.8 knots
very nice ride, smooth, no cavitation, no porpoising. fastest top end. best cruise. only negative was the RPM's were low on the top end. other than that you could feel the stern rise up and handled nicely. i filled up the livewell and i couldnt tell the difference from when it was empty or full. but it is not good to have a top end of 4800. it is a big wheel at 15 1/2 diameter.

i took pictures today but will try to attach to a later message.
tom i think after all i heard i should try the stilletto advantage II in the 17p.

Tom W Clark posted 09-20-2006 08:54 PM ET (US)
Forget the aluminum props, they are poor performers as your data and comments indicate.
The Renegade seems like a good fit based on RPM data but your comment about the bow riding too high has me puzzled. What happens when you trim in?
The Mirage Pluses are great props. I agree the 19" is much but you should really try a 17" Mirage Plus given that you liked it apart from the RPMs.
You impressions are consistent with common propeller theory. Large diameter props ted to be "stern lifters" and smaller, highly raked props tend to be "bow lifters", but I am still having a hard time with "too much bow lift".
What set of holes is your motor mounted on? It should be at least "one hole up".
myjule posted 09-20-2006 10:12 PM ET (US)
the motor is mounted on the highest hole on the bracket so that the motor mounts are sitting directly on the transom. not sure if i said it correctly. to say it differently looks like the motor is in the deepest position so that the motor is as low as it can go.
i can trim it down more to stop the poirposing but then my speed goes way down and it feels like the boat is lunging through the waves.
when i say porposing i mean slight. it is magnified when i am carrying a full well and in the ocean.
Tom W Clark posted 09-20-2006 10:41 PM ET (US)
Ah. Your motor is mounted all the way down, too low. It should be up one set of holes (3/4"). This will help the porpoising a bit and increase your speed.
Do that and try a 17" Mirage Plus or 19" Offshore/Vensura. I think you will be very happy. A Stiletto will make you happy too, but to whatever extent possible, try before you buy.
myjule posted 09-21-2006 10:06 AM ET (US)
ok i will try that at the end of the season. i would have thought the lower the motor the better the bite and therfore the less porpoising. see you learn something new everyday.
second hole down. got it
thank you for all your help

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Author	Topic: 150 evinrude prop opinions
myjule	posted 07-22-2006 11:13 AM ET (US) Just purchased an 18 outrage 1986 with a 1993 evinrude 150hp. the motor is turning a 14 1/2x19 aluminum prop. i have always used stainless on all of my other boats and i was wondering if i should make the switch to a stainless prop or just be content with the performance i am achieving. half tank of fuel, wind 10 knots 2 people 2 anchors on bow and portable livwell empty in stern. 3600 24.2 knots converted to 28 mph 4100 26.8 knots converted to 31 mph 5300 37 knots converted to 42.9 mph i apologize for the lack of data at all RPM's but my cruise is the important thing. couple noticable things during test: motor sounds very comfortable in the 3500-3600 range. bow is higher than expected at cruise and there is a slight porpoising. cant trim motor up where i would expect to run the boat because the porpoising gets worse and there is noticably more slippage. under normal conditions i will be carrying a 27 gallon full livewell in the stern i know of a couple outrage 18 owners who are cruising at 27 knots converted to 31.3 mph at 3500-3600 rpm's i am in the optimum WOT range which is listed at 4500-5500 so the obvious answer would be just to be happy with what i have, but i am looking to increse my cruising speed at 3500. any suggestions would be greatly appreciated.
Perry	posted 07-22-2006 12:57 PM ET (US) A good stainless steel prop, perhaps a 14.25 X 17 Stiletto would increse your cruising speed at 3500 RPM. It should also increase your speed at all RPM and improve your hole-shot too.
myakka	posted 07-23-2006 09:52 AM ET (US) myjule I have the same boat as you with a mercury 150. When I changed propellors from an aluminum 19P to a stainless 19P I gained 4 mph at 3000 rpm. The stainless 19P on my boat works well lightly loaded. I would take Perry's advise and get a 17P propellor. Mike
Peter	posted 07-23-2006 10:27 AM ET (US) Your calculated propeller slip at WOT is 16 percent, which is high. What brand is the propeller? Your porpoising may be caused by the motor being mounted too low on the transom. To improve performance, you might consider raising the motor up on the transom by one bolt hole and switching to a stainless steel propeller, such as the 17 or 19 inch pitch Stilletto (you'd have to try them out to see which gets closer to 5500 RPM at WOT), 19 inch pitch Viper, or 19 inch pitch SST.
myjule	posted 09-19-2006 02:23 PM ET (US) thanks for the replies. i havent found anyone who has stiletto advantage II on long island ny so i can demo. i did try the mirrage plus in the 19p which i could only get up to 4900 WOT which is too low. i am going to give the 17p mirage a try. anyone use both the stiletto and the mirage that can provide me with some feedback. trying to get a faster hole shot and increase mid range performance as i lug around a livewell under the lean post
The Judge	posted 09-19-2006 02:30 PM ET (US) Not sure if a big heavy prop like the mirage is right but try it. They are more for I/O's and heavier boats like a 22'. How high is engine raised? How does she perform with livewell empty, that is over 200lbs aft full. Redline is 5500 so 5300 is right on but alum stinks so I would say a 14.5x19 SSt would do the trick. I sold my 225 to my friend for parts, I will see if he still has the prop which is mint if you are interested, e-mail me(under $200 delivered).
Tom W Clark	posted 09-19-2006 09:57 PM ET (US) myjule, You should try a 14-1/4" x 17" Stiletto Advantage II. I can get one of those for $225 delivered, returnable with a restock fee and shipping (admittedly a risk of $40 or so). The 19" OMC SST II prop that Nick mentions would be an excellent choice as well.
myjule	posted 09-20-2006 09:25 AM ET (US) Tom is that stilletto a speed prop (ie. one that would get my bow up) because i am trying to counteract the bow up scenario and am looking for stern lift. i have been through 1 prop guy who had me try 5 props none of them worked. i did try a 17 pitch renegade prop and WOT was 5600-5700 which is over my stated rating of 4500-5500. and she had alot of porpoise and tough getting out of the hole. i am a little nervous going to a 17 pitch because i dont want to over RPM it. but from what i hear about stilletto's they tend to reduce the rpm's because of desiegn and is more comparable to a 19p. Is this a true statement? has anyone tried a 19p stilletto on an 18 outrage? tom your serious i could get a new stainless stilletto for 225 delivered? that sounds like a deal to me
Tom W Clark	posted 09-20-2006 09:40 AM ET (US) A 17" Stiletto Advantage will perform like most 19" pitch props from other manufacturers, that I is why I am recommending it. You say you have tried five different props. Would you please provide all the speed and RPM data along with any subjective comments you have? That would help us make a solid recommendation. Having owned an Outrage 18 with a 150 HP OMC motor, I know that is not a boat prone t porpoising...unless something is amiss. How is your motor mounted? How much gear do you have onboard? Where is it located? Do you have a photo of the boat floating in the water?
Don88outrage	posted 09-20-2006 10:27 AM ET (US) "alum stinks so I would say a 14.5x19 SSt would do the trick" got to agree with Nick on this, reason being the SS is a cupped prop, that's the narrow curvature you see along the leading edge which helps to reduce slippage. You won't see this on an alum. prop. Have had several different props on an OMC 150/18' Outrage over the years and the 14.5x19 SS, (original prop when boat was new), performs the best.
Tom W Clark	posted 09-20-2006 12:13 PM ET (US) Virtually all (large outboartd) props sold today are cupped, including aluminum props. The amount of cupping is typicallyh more modest on aluminum props.
The Judge	posted 09-20-2006 01:49 PM ET (US) Friend is not selling his SST. I agree with Tom that something is amiss with the porpoising thing unless you don't know how to trim it. I can NOT see why a 17, 19, or 21" would be "tough" getting out of the hole on that boat and engine combo. The 2 I have driven, you better be holding on when I nail that throttle or wearing a bathing suit.
myjule	posted 09-20-2006 05:22 PM ET (US) the aluminum is cupped but slips alot so no need to talk about it. Here are some limited stats mercury apollo 4 blade 19p 3300 23 knots WOT 5300 37 knots alot of vibration which was caused by the swing back of the prop which was less than an inch from the steering tab. it actually wore the paint away. too much vibration 3 blade renegade 17p 3300 22 knots WOT 5600 37 knots bow rode too high when planning and i didnt even fill up the livewell 3 blade no name brand double pitch 17p 3300 21knots wot 5600 37knots cavitation when planning which i was surprised since it was double pitched and vibration at cruise but it was also a used prop and was beat up a little mercury mirage plus 19p 3300 25.5 knots wot 4800-4900 39.8 knots very nice ride, smooth, no cavitation, no porpoising. fastest top end. best cruise. only negative was the RPM's were low on the top end. other than that you could feel the stern rise up and handled nicely. i filled up the livewell and i couldnt tell the difference from when it was empty or full. but it is not good to have a top end of 4800. it is a big wheel at 15 1/2 diameter. i took pictures today but will try to attach to a later message. tom i think after all i heard i should try the stilletto advantage II in the 17p.
Tom W Clark	posted 09-20-2006 08:54 PM ET (US) Forget the aluminum props, they are poor performers as your data and comments indicate. The Renegade seems like a good fit based on RPM data but your comment about the bow riding too high has me puzzled. What happens when you trim in? The Mirage Pluses are great props. I agree the 19" is much but you should really try a 17" Mirage Plus given that you liked it apart from the RPMs. You impressions are consistent with common propeller theory. Large diameter props ted to be "stern lifters" and smaller, highly raked props tend to be "bow lifters", but I am still having a hard time with "too much bow lift". What set of holes is your motor mounted on? It should be at least "one hole up".
myjule	posted 09-20-2006 10:12 PM ET (US) the motor is mounted on the highest hole on the bracket so that the motor mounts are sitting directly on the transom. not sure if i said it correctly. to say it differently looks like the motor is in the deepest position so that the motor is as low as it can go. i can trim it down more to stop the poirposing but then my speed goes way down and it feels like the boat is lunging through the waves. when i say porposing i mean slight. it is magnified when i am carrying a full well and in the ocean.
Tom W Clark	posted 09-20-2006 10:41 PM ET (US) Ah. Your motor is mounted all the way down, too low. It should be up one set of holes (3/4"). This will help the porpoising a bit and increase your speed. Do that and try a 17" Mirage Plus or 19" Offshore/Vensura. I think you will be very happy. A Stiletto will make you happy too, but to whatever extent possible, try before you buy.
myjule	posted 09-21-2006 10:06 AM ET (US) ok i will try that at the end of the season. i would have thought the lower the motor the better the bite and therfore the less porpoising. see you learn something new everyday. second hole down. got it thank you for all your help