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Posts: 76
Location: MPLS Metro | I have a 692vs with a 175 on it. Im running a 21 pitch 3 blade and can get a topspeed of 43mph at 5100 rpms. Any more trim and I can get the rpms up but start losing speed. It runs smooth but im curious to see if anyone else is getting a better topspeed at higher rpm's and if so, what setup are you running?? |
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| Something dont sound right. Is that a tempest plus? I would first make sure the motor is in good shape but checking plugs. Compression, ect. |
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Posts: 13688
Location: minocqua, wi. | what year is the boat?
what year/model is the motor?
do you live at elevation?
my 175 Pro-XS gets 54.5 mph on the '94 690C with a 21P Rev-4
the same Rev-4 on Mike Bruggink's 690VS with 175 Opti ran 59 mph i believe
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Posts: 76
Location: MPLS Metro | It is a 2000 692vs with a 2000 Evinrude Fitch. I just had it all tuned up so plugs are brand new and they said it was good to go. It had a Renegade bass 4 blade 23 pitch and could only getit up to 43mph when I purchased the boat. Now it has a 3 blade aluminum 21 pitch on it. I switch because i dont want to wory about clipping a rock and damaging my lower unit and the prop place told me to go down in pitch to get the rpms up. I dont live in elevation, im in the mpls metro
Edited by clintv11 6/2/2013 10:28 AM
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Posts: 13688
Location: minocqua, wi. | the 2000 ficht were notorious for some difficulties but usually the 200hp and i'm not able to speak to the 175hp. there is a guy VMS Steve who you need to search out or hopefully he'll chime in. your 175 assuming it's turning the rpm's should be able to get you both the lift and the speed in the low-mid 50's without much problem. i have a 21P Rev-4 you are welcome to try but i won't have the boat at our place in msp burbs until july.
find any motor/prop discussion and pm Steve. i'm sure he will get you some help quick, i think he lives in hastings, mn.. |
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Posts: 76
Location: MPLS Metro | Thanks for the info jonnysled. I might hit you up on trying that prop. Let me know when you are in town. |
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Posts: 3508
Location: Elk River, Minnesota | Hiya,
Sled was right...I'd chime in on this one...
couple of things with the Ranger 690 series of boats...the in-floor tank is more forward than the following models of 619, 620 series, thus the reason your 21 pitch aluminum cannot get anything more when you trim...it just does not have the lifting capabilities to get the boat out of the water. My bet is you have side spray that is up by the console seat as you are at full speed.. I would suspect that is why you cannot get any more RPMs out of it
With this particular boat, a good 4 blade like that Rev 4 mercury makes is a great option. Only problem is I don't believe that will fit your motor as the spline count and hub design will be different.
OMC/Bombardier have a couple of good props to try, but they are steel, which will get the entire boat out of the water more. The Renegade series of 4 blade props has both a bass style, but also has an off shore style designed for heavier boats. The offshore design is the one I would be looking at as it is not quite as aggressive as the bass model. It would allow for higher RPM's and, you would also be able to raise the motor up a few notches to get even more out of it as well. My gut instinct with you running aluminum is your motor is all the way down on the transom, or is one hole up. Definitely not the most efficient position for the motor.
If you choose to stay in an aluminum prop, a good long look at the Solas Amita series of 4 blade props would be your best bet for a prop that through its design and casting process will be thinner than a stock aluminum, flex less than a stock aluminum, yet has the breaking characteristics of aluminum to lessen shock on your lower unit. But...and this is a really big but, is if you knock a rock at speed with aluminum, the aluminum isn't going to save you...the prop shaft will bend due to the fin impact, even though the prop fin will break. If memory serves me correctly, that motor should be running about 5500 at full throttle when trimmed, and I'm betting a 21 pitch is about right. Much of that depends on the gear ratio, and that number I am unsure of. I would think it is right around 2:1, but could be around 1.85:1. If it were the smaller ratio, then even trying a 19 pitch might help to get RPMs up.
Being you are in the twin cities, I would check with Nelson marine by white bear lake. I believe they may still have a demo prop program (blue props) where they will allow you to take a prop out and run it to get the best prop for your motor.
If you are still having some issues with things, it would be very easy to make a run down here and we could do some testing on the river, being I am in hastings.
So...in a nutshell, a good 4 blade is your best bet. Renegade Offshore for steel, or Amita 4 in aluminum. The steel props should have a good amount of cupping and moderate rake, and most likely will be vented as well. If the Mercury REV4 has an exhangeable hub system in it that would allow you to run it on your motor, that would be a dandy prop to try. A few different guys like "Sled" on here run that prop with very good results.
Steve
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Posts: 440
| You can run any Merc prop on that Rude you just need to purchase the Flo Torque Hub Kit and fits your engine. From listening around that Rev 4 would be the route to take. Very little reason to not have SS. The hitting things and taking out a lower unit thing is almost a myth. Usually if you hit something hard enough to take out a lower unit it doesn't matter what the prop is made of. Good luck, setting up a boat can be frustrating. |
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Posts: 76
Location: MPLS Metro | Thanks for the info VMS. I will put the Renegade Bass, 23p back on and run it and get the exact numbers (RPM/MPH) and let yoh know what I see. In addition, I purchased this boat from down in OK and the guy who owned it left it in the water all year and I dd notice a real thick build up of algea,ect so I spent the night on my back under the boat scrubbing the entire hull down, worse job ever! But now it is spotless so we'll see if that may have been a factor. It's one of those things, anxious to get out and try out the new boat and forget about the cleaning part.....lol |
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Posts: 76
Location: MPLS Metro | Well I went out today with the Renegade 23p on it, with a clean hull and got 5400 rpms and 50.6 mph on the gps. Its amazing how much that dirty hull kills the performance. Thats the first thing I should of done, but hey atleast now I have a back up prop...lol |
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Posts: 3508
Location: Elk River, Minnesota | Well...want to try and get more out of it? 
You've got it this far, why not go for more?
Steve |
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Posts: 76
Location: MPLS Metro | VMS, yea i would deffinitely like to get more out of it. Where should I go from here?? |
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Posts: 3508
Location: Elk River, Minnesota | Hiya,
First off, where is the motor mounted (what holes are the bolts in on the motor)? Most boats when they are rigged are set up with the motor either flat on the transom or mounted one hole up off the transom. This allows for good overall handling and satisfactory speed, but is by far the optimum set up for the rig. As soon as you start playing with steel props and you find one that works well for you, you can play with motor height a bit to get a touch more out of it.
In your case, you have a great prop on the boat currently, and the tweaks to get more out of it don't cost you a dime..only some time.
In most cases with a prop such as yours, you can move the motor up a couple of holes without any major loss in handling. You will increase the amount of slip in the prop, but you will also gain some top end speed as well. Roughly every inch you move the motor up or down equates to about 100 RPM in the same manner. Go up, gain...go down, lose...
If you can get back to me on that, I can walk you through what you can try a bit more...
Steve |
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Posts: 76
Location: MPLS Metro | It looks to be mounted all the way up. Here is a pic
(IMG_20130605_153548.jpg)
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 IMG_20130605_153548.jpg (85KB - 181 downloads)
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