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Posts: 477
Location: Iowa | I finally got out today to try the Enertia 22pitch I borrowed, the vent holes were plugged solid. Seemed to get on plane quickly-better than I thought it would. I was loaded with my typical load, with full tank of gas and empty livewells.
RPM's MPH
3000 25 would hold plane here
3500 30.7
4000 36
4500 39.9
5000 45
5200 This is where it seemed to want to run. If I trimmed more it would blow out.
I did it get it to hold once and 48.4 mph. I did notice it did not take the corners as well as the HI 5 23 pitch that has been on the boat. But I could get more speed from the HI 5. Probably because it was hooking up better at more trim. I can almost trim all the way out with the HI 5, but just over half way with the Enertia.
I then filled both livewells with the following results.
RPM's MPH
3500 31.4
4000 37.3
4500 41
5000 47
Top speed with livewells full was 48.2 mph. Hole shot was real close to the same, and it seemed to hold just a little longer before blowing out while trimming.
Strange to me that my speeds picked up with more weight in the back. More bow lift? Holding the motor lower in water to get better bite? I can only raise motor 1 more hole. Maybe I need to drop it. They had a 21P Tempest I can borrow too, might try that one next weekend. Any other suggestions or experiences. I want to try a 23 tempest, but think it might be too much. This is my first experience playing around with props, so I am open to advice. |
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Posts: 477
Location: Iowa | Max rpm's for my motor is 5600 by the way. Running the HI 5 23P I could easily hit 6000 if I didn't pay attention, but the load was a little lighter also.
Decaf reports running a 23P Trophy Plus with 52 mph at 5500.
Edited by Lone Stone 7/1/2012 10:45 AM
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Posts: 477
Location: Iowa | I returned the Enertia today. Score, they had a 21 pitch Rev 4 in. I will test that one tomorrow. |
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Posts: 477
Location: Iowa | I'm getting more confused now. I tried the revolution 21 pitch today. Had the wife and kids with, but they add less weight than me. Everything else in boat was same as last weekend. Would hold plane at 26mph and 3000 rpm. 37Mph @ 4000 rpm. They got out while I did the last run. 51.1 Mph at 5200rpm. The prop would hold to full trim without blowing out, but 5200rpm was the most I could get out of it. Does the trophy turn easier?
Edited by Lone Stone 7/8/2012 1:06 PM
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Posts: 13688
Location: minocqua, wi. | i don't understand ... turning rpm's isn't the goal, if it is then put on a high-five and spin the motor. i'd rather have plane at 26mph and 51.1 cutting and moving water with the rev 4 at 5200.
when you cup and rake water you will lose rpm's, you may see an increase in rpm's on a 3 blade with some more speed, but you'll suffer that flat ride and launch you get from the rev-4
51.1 with a 150 and 26mph on plane with that boat is very, very good performance.
if you want more you will have to get a 175hp outboard or buy another boat with a 200-250hp motor. |
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Posts: 477
Location: Iowa | Thanks for the reply. I understand that those are good numbers for that combination. I've never had to experiment with props much before. I just feel that I should be able to hit my max rpm's when wide open and trimmed out. Maybe I am wrong?? I'm not that terribly worried about top end speed, just want the right combination. I don't intend to run wide open all the time (I'd have a fast boat if I had that kind of money). I've just always been told that your prop should allow you to run to your max rpm's so you get the most out of your engine in all ranges. I loved the way this prop made it jump out of the hole and handled good except in the tightest turns, where they all blow out anyway. Maybe this is as close as I will get. I don't like the HI-5 because I have to watch it too closely to make sure I'm not going to over rev when I do open it up. If this as close as it gets, I'm fine with that, but I want to make sure everything is right before I start dropping $ on props.
Edited by Lone Stone 7/8/2012 2:51 PM
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Posts: 13688
Location: minocqua, wi. | maybe Steve from Hastings will chime in ... i'm curious now too, but i always figured the grabbing more water with the rev4 would cost rpm's, but then using the rpm's would also compromise low-end performance so the application of the prop within the range of torque the motor produces drives the selection? ...
i wonder if there is a curve by prop by general hp output that could show you where you are on the performance curve???
i agree on the high-5 ... mine sucked the life out of the motor and i never knew how bad it was until changing it out for another one. |
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Posts: 13688
Location: minocqua, wi. | also ... nelson worked with john down at that prop custom shop in burlington, wi. to optimize his prop and he might be able to help you to see what kind of improvement off of stock you might be able to achieve.
i think the cost is like 5-600 bucks to take what you have and optimize ... key would be to determine what the value of that would be. i'm struggling with paying that kind of money to improve what is already pretty darn good.
he'll probably chime in and share some numbers.
we're doing some testing this week with the rev4 and tempest 3-blade and we'll come back and share what our results were too. |
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Posts: 477
Location: Iowa | Maybe I overthink things. I thought about the repower, but with what I get from the 150, it's just not worth it to me at this point. The outboard on it now, has very little use, so I might as well run it a few years. I'm going to continue to try a couple more props if I can get my hands on them, but right now, it is the Rev 4 21p that gets my vote if the rpms are really not a big deal. |
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Posts: 3514
Location: Elk River, Minnesota | Hiya,
Sounds like that rev 4 is a good prop for your boat!!
Couple of thoughts here:
First, with many props, if you cannot get it to a higher rpm, it will not trim well without letting go. I have that happen with my current prop (OMC raker) where if I am not at a high enough rpm level, the the prop will not hold and it definitely lets go in a corner. At full rpm, it will stay hooked up and with just a little trim down for cornering, it will hold there as well.
On the day you had your wife and child with, the more weight in the rear actually helps the motor out for trimming the bow. The extra weight in the rear moves the whole center of gravity of the boat toward the motor. Thus, the bow acts as if it is lighter.
On the enertia, what was your normal load?
Now...on to the rev 4:
First and foremost, it sounds like it is hooked up quite well. But...depending on where the motor is mounted, you might be able to gain another 200 rpms or so.
In most cases, motors are mounted in the second hole up off the transom, which is a good placement for aluminum props and overall handling and speed. Most people don't do anything more with their boats after they have it and think that is how it should perform. In your case, you are playing with things and have found a prop that is doing well.
If memory serves me, that particular boat is fairly heavy and the gas tank is toward the front. If my memory is on, that explains why so many people went to a HI 5 with them, as the high 5 allows for excellent handling and lift overall, but it does sacrifice speed as it is not optimized for that purpose.
Here is what I would be considering: If your motor is in the lowest mounting position or one up, try raising the motor to the highest hole. If the motor is all the way flat on the transom and you go to the top, you might see a gain of upwards of 300 rpms. That would get you to 5400 - 5500, and if you have been running in these hot temps the midwest is having, you might see even more when things cool down. The high temp and humidity rob the motor of HP.
Steve |
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Posts: 477
Location: Iowa | Wow, lots of good info there. THANKS! The load both times was my normal load for musky fishing, which is heavier than when I fish other species. Tank full (40 gallons under the front deck). I did have the wife and kids get out for the final run of the rev 4 so it would be the same as the week before. I can go up 1 more hole with my motor, then it will be all the way up, will that be a problem? Both test drives were in the morning before it got too hot, but humidity was still there, although today was very nice out there. In your opinion would it worth trying the Tempest? I don't really want to lose any hadling though. Also, what are your thoughts on the Tropy Plus. Does it spin easier? I think it is a lighter weight prop, but again, I am not sure. Thanks again Steve. Very much appreciated. I think I will start looking for a good price on the Rev 4. |
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Location: Contrarian Island | 51mph with a full tank and 2 people w a 150 on a 690 I'd say you aren't going to get much better than that! keep it!
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Posts: 477
Location: Iowa | It was just me in the fastest runs. That thing really holds onto the water though. |
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Posts: 5874
| Maybe try a 19 Rev 4? That would bring the RPM's up a couple hundred. The Rev 4 is a bigger wheel than the Tempest, so it should be harder to turn. You might see some higher RPM's.I know some guys that liked the Tempest Plus on their 690's.
When we set my boats up, we ran a light load to get the rpm's at max. Then tested at full load to make sure it was within the tolerance. I ran a 21 Rev 4 on my 1890 Tuffy with a Merc 200, and my RPM's were about 5300 full load.
Edited by Shep 7/9/2012 8:10 AM
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| The Rev 4 is really good on the 690/2's. I have a 21P on my 692 with a 175.
You might try a 19P, you will gain RPM but your speed will stay the same. May be able to improve holeshot and lower onplane speed to 20-22. |
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Location: Contrarian Island | i have a custom 4 blade solas on my 690...i really like the way the 4 blade bites...great holeshot, mid range and scoots along at 50+ w 2 guys, and 1/2 to 3/4 tank....overall i think you'll like the 4 blade |
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Posts: 440
| If 5200 is in the recomended operating range at WOT then you are set. Two things that kill motors, lugging them down and turning too many rpms. Lugging them down is just as bad per the guys at Hydro-Tech. Go up a hole and see what happens. Maybe get a jackplate and start the mess all over. Our boat is about 100-200 rpms lower right now than in the spring, something to think about.
Edited by ChadG 7/9/2012 10:37 AM
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Posts: 13688
Location: minocqua, wi. | i've never run a 3-blade, but will tonight. i'll be surprised if i ever go away from the bite of the 4-blade. having your ass out of the water while turning and running a bit slower is so nice! i'll give the top-end for the ease of just driving on top of the water at a broader range.
brad ... any thoughts on the difference between the solas and the rev-4?? |
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Location: Contrarian Island | i think they are comparable...stock props are just that...stock and will be good for a wide range of boats/motors/applications...if you want the best performance from any prop that will take customization from a place like DAH...the blades on my 4 blade solas are sharpened to just about a filet knife sharp...talk about biting the water... |
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Posts: 238
Location: Rhinelander | I am running a 23p Trophy and it sucks on my 690 with a 175 efi. No hole shot and believe it or not haven't cranked her all the way up....haven't been on a big enough lake to stretch her out. Don't know wot rpm's or top end speed.
Holding back on going custom because of a 175 proxs hopefully this spring.
What do you guys think for now.....21p or 23p rev with the 175 efi? |
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Posts: 13688
Location: minocqua, wi. | there's a guy coming up to test my 23 on his later today ... give me a shout sometime and you can try my 23 and see what you think. we'll be on lake minocqua around 5pm. i think if you're up in the area stop out. we're meeting at rollies later this afternoon. |
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Posts: 238
Location: Rhinelander | Crap....should have looked you up before. In the valley now and shooting for Thursday night back home.
Will wiggle some free time to take a run in your rig and/or try your prop.
Please let me know how things turn out with the props. |
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Posts: 726
Location: Eau Claire, WI | I'm running a 21P Tempest Plus on my 692 w/ a 150 Opti. 45 is about the best I can do +/- 1 mph. About 5200 rpms based on my in dash tach.
I would love to get a few more mph's out of this set up. I'd say you are doing good and thanks for asking the question.
I'm not sure if I should put on a new prop or move the motor up one hole first. There is room to move the motor up one notch.
I wouldn't want a Hi 5 though. the boat I have experience with has a hard time backing up with that prop. A 4 blade might do the trick though.
Jono
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Posts: 5874
| I got a 23 Rev 4 brand new that came on my Tuffy 1890 200 Merc. But I don't think you'll turn it. That's a big prop. I was getting only 4800-4900 lightly loaded.
Edited by Shep 7/9/2012 3:35 PM
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Posts: 477
Location: Iowa | Thanks for all the reports! |
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Posts: 176
Location: Tomahawk, WI | Tonight Sled and i are going to try each others props. Mine is a 690 with 175 Opti, i currently am running a 21p Tempest Plus. Sleds is a 690 with a 175 Proxs currently running a 23p Rev4. I will write down the numbers of both these props and list them on Wednesday. I doubt i will be able to turn a 23 Rev. 4 to optimum 5750rpm's with my motor, but at least i will get the feel of it and if i like it i can get a 21p or 19p.
Mike |
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Posts: 238
Location: Rhinelander | I have a 21P rev-4 on order to try out Wed or Thur. Will report what I find.
My boat is with me in the valley having the buff/polish/clear work this week. |
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Posts: 176
Location: Tomahawk, WI | Hodag, i think that prop will work for you or me, Sled is probably pushing 25 more hp than us thus the 23p. I believe for every pitch you drop, you gain 200 rpms or something like that. |
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Posts: 238
Location: Rhinelander | I'm hoping you're right.
Whenever the boat detailing is complete I will hit the water and find out.....wed or thur.
Should work out to be an ok back up when/if (next spring) the proxs 175 is installed. I will have a custom prop built where BN suggested at that time.
175 proxs I thought was around 192 hp when dyno'd?
If the 21p works and I buy it I can let you try it out some time.
Edited by Hodag Hunter 7/10/2012 9:01 AM
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Posts: 13688
Location: minocqua, wi. | 175 proxs is a phriggin rocket ... |
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