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SENSENICH SUPERWIDE RPM ?

crowhater

crowhater

Well-known member
I have been told that the super wide performes best around 1800-1900rpm. Now guys are telling me that spinning them 2100-2000 rpm is the best rpm for push and it makes less noise. Everything I have heard and seen show that props make less noise at lower RPMs. So all you super wide owners please chime in and tell me what works best for you.
 
CrowHater

what I told you worked for me does not mean it is what you need or will work for you I have just found that my WaterThunder engine runs better and seems to produce the power I want at a little higher rpm if you running a large CI Cadi motor then the lower RPM will probably work fine for you but I did find that spinning my S series Sensenich 200 rpms more than they suggested did not make any difference in the noise level to my ear and there has been several people on this site that have heard and seen my boat run and commented on how quiet it was and from what I have found through experience and a lot of trial and error no two boats are the same so there will be a lot of variance in set up's and personal taste
 
Sniper,
I just want to get as many diffrent veiws as I can before I make any changes. I have heard other people say the same thing you are saying. The more I dig into the super wide saga it seems people are divided 50/50 on it. The ones that swear by it have a diffrent view of what RPM to run it at. Bottom line I am not going to turn my motor over 5000rpm, first because I don't want to ,and second because there is not much power to be gained by doing it.
 
I perfectly understand Cadi's make there power down low this little small block of mine seems to like the RPM s a little higher I just did not want to lead you a stray and get you doing a bunch of changes to your boat that may not be to your liking sound like you have a real brute that makes a lot of power you have a lot more cubic inches to work with than I do
 
I have another question also!!!!

I want to switch out my hub bolts and my clamping bolts for Titanium bolts. I know titanium is stronger and lighter then the grade 8 bolts we use now. The weight of all the titanium bolts together would only weigh about the same as one clamping bolt. This reduction in reciprocating weight would have to be of some advantage and the cost on the bolts is not that much. What I don’t know is if the Titanium bolts can handle the same stress.
 
When I first got mine it was set on 1 and I was turning it around 5,300 (1975 prop rpm). It felt like a dog. Had to do 2000 rpm just to do a good no-wake speed. It would run dry but it took just about WOT.

I readjusted to the 2 mark and it is now a lot better. I now turn about 4900 WOT. Not the snappiest but I go anywhere I want to without drama. Read my post about my Saturday ride.

My opinion is there's a lot of windage loss with this prop. I don't believe my zz383 would turn it 5800 with the pitch set at zero. I would probably do better overall with a two-blade and more pitch, but I'm so happy with it right now I'm not touching a thing.
 
The superwide preforms all the way down to .5 mach and below lets say 1600 rpms and is scarey quiet .add rpm it gets louder add enough rpm it's as load as the rest and pushes the same as the rest. That info comes from alot of testing ,prop changin ,money and time spent.Thats Kinda why I'm still runin a warp drive ,one day I'll be ready to be Quiet.Once people firgure out that the only advantage of the superwides are that they are quiet. I should be able to pick me one up on the cheap.
 
stan":1va7yt66 said:
The superwide preforms all the way down to .5 mach and below lets say 1600 rpms and is scarey quiet .add rpm it gets louder add enough rpm it's as load as the rest and pushes the same as the rest. That info comes from alot of testing ,prop changin ,money and time spent.Thats Kinda why I'm still runin a warp drive ,one day I'll be ready to be Quiet.Once people firgure out that the only advantage of the superwides are that they are quiet. I should be able to pick me one up on the cheap.
Click to expand...
Well, they're purdy too.

I do agree about the push though. I remember 7 or 8 years ago someone did a test of all the major propellers available at the time and they were eerily close for maximum static thrust. I'm talking within about 5% or so.
 
Airduds

Thunder and I tried the two blade set up with the S series prop it works great for racing but it does not push very well and I had to run a lot more rpm to keep my cruse speed up so you are much better off with the set up you have from what I have found

CrowHater besidesbeing Law Enforcement I have been an Air Craft mechanic for 29 yrs and I have never seen Titanium bolts used on any Aircraft even race planes for the weight loss it would not be worth the risk of a failure I spoke to an engineer out here at work about it just a few minutes ago he said he would not recommend it you could pm Leo he is an engineer I think he will probably tell you the same thing
 
well with my set up I have a almost stock 350 swinging a 80" super wide and turn my motor 4400 wot so the prop is only spinning 1642 rpm and the boat is quiet and runs dry ground and so far have not got stuck (yet) that is pitched on the #2 mark when i put it on #1 i spin it 4900 wot and I don't care for how it runs DRY so different boats different area and different combo's every thing is different so no two boats will preform the same.

Just think of it as how much air can leave the back of the cage and then look at how much gets in with all of the stuff in the way and ask how many people freed up air flow by moving the radiator or put bigger squares of wire on there cage to get air flow to there prop little squares will not let in as much air, as can leave the back of the cage.
I see boats with no wire on them and they said there was a big difference on how the boat ran.
 
I have a 18' alumatech with a 461 BBC and the new super wide with a 2.68 gear box.I turn it about 5300 rpm at wot it is set on the #3 mark on the blades.The boat performs good.I think I will take a little pitch out of it and see what the diifference is.
The top end speed is about 40mph so I would like to get a little more out of it.Hope this helps you.It is a lot quieter than my previos prop which was a sensi 3 blade with 12" blades.and has more push.
 
i have a 2 blade superwide on my caddy it pushes low down much more than my 3 blade psr did.as far as noise go's the superwide is quieter from idle to about 1800 rpm
but faster than that i can't tell much a difference.
 
I am going to add another blade to mine and set them at #2 which should put me at 5000rpm WOT. This is what I am going to adjust the 4B 80" to do. I think I had so much pitch in the 3B 82" that my angle of attack was not the best.

With it set at #3 when I hit WOT I blew past 50mph and lifted, I am sure it would have turned more mph.


c chardt,
I hear what you are saying loud and clear. I am toying with removing all of the expanded steel off my cage except for the part that is down in the hull.
 
I don't know airboating, but from a layman's point of view, if the prop gets "adjusted" to hold the engine at , let's say 4900 rpm, seems it would push just as hard as any other prop set up capable of holding the engine to the same rpm regardless. No matter the number of blades, width ect.. or if it didn't, the engine would speed up to me. Like I said, I don't know airboats, nor fly planes. I would recommend against titainium anything for extended useage IMO. It is incredibly strong and light , but the least little flaw (like cutting threads in it) gives it a place to stress fracture after an extended duty cycle. On a titainium valve or rod, if it has a scratch, you scrap it. Especially when it holds a frickin wad of sabers on to a skill saw. Maybe you guys have already done this and gotten away with it, not I. :D
 
Can some of you guys with the Q blades post some Rpm #'s for cruising? Just a ball park of your rpm's and app. speed when running deep and skinny water. I know every bodies boats are different just trying to get an average cruising Rpm with these props.
 
1200 TO 1600 SKINNY 15TO 20 ! 2500 TO 2900 DEEP 25TO 30! A LITTLE LESS SOMEDAYS ! 16 BY 8 2500 POUND NOW ! :D WIND REALLY MAKES IT HARD TO GET NOW DAYS! :shock:
 
crowhater, don't use Titanium bolts. Period. Trust me, I've had experience with them in areas that weren't stressed anywhere close to what a prop is and they will fail. They may be better in compression but not sheer. No titanium bolts are going on any part of an airplane I'm putting together. I'm sure there were lots of those in hot sections of the jets I flew, but I didn't install them.
 
Thanks for the heads up on the bolts. From what I am hearing from people who have tested these blades and run them is they will do better with more blades turning slower. I would rather have five 84" super wide blades spinning 1600rpm then 3 and spin my motor at 5 grand all day. Small blocks love to spin but big blocks don't so I want to avoid it.
 
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