3 Blade vs. 4 Blade Prop

[jet]

OK...but thats like saying what kind of girl do you like?? A 4-Blade has more BITE and more SURFACE area Period! Thats where it has Its advantage..yes you can pick the wrong gearing in it or pitch but it has more BITE and it has more surface area. A smaller 3-blade will spin faster, use more rpm's and burn more gas. Power boats want to spin the prop very fast for speed..a tractor (which is what our boats are made for) want more BITE for moving weight. When I started putting 1700-1800 lbs in my boat the wake was great but it took me a football field and full throttle the whole way to get up to plane..it was a HUGE waste of gas and LOAD on my engine. AFTER switching to a 4-Blade I use 10-20% throttle now and the boat is up to plane in 2 to 3 boat lengths..GAS mileage is WAY down and my engine doesnt work hard anymore. Im sure I cant go 40 mph anymore but I dont care..Im a wakeboarder. Now having said that there are variables and this is where the opinions and choices come in. My trans is a 1?:1 trans Power Plus option (8-10?? I cant remember) which is geared more direct so my boat RESPONDED very well to the BIG 14x14 bladelike a drag gear would on the track. Now we put that same 14x14 on my buddies Malibu he has a 1:1 trans to but the middle# was higher like a hwy gear..his ended up being like a 1:28:1 trans and that higher number is more like a hwy style gearing and wouldnt push the 4-blade. Not enough rpm's so it was like having 2-hwy gears in there. He is now trying a 3-blade like a 13x9 pitch which has ended up being a better match for his Hwy like gears in the trans. I think the older boats with the more direct 1:1 ratios respond really well to a bigger prop but the new trans has way more gearing in it and might not benifit from a 4-blade as much. So heres what you do. You call the factory, tell them how much weight and what YOU want the boat to do and they will recomend a starting point BUT, make sure you have trade up or down options so you can try 1-2-3 props and find what you like. Easy as mud!! Right! My opinion is that I DID NOT WANT A 3-blade anymore. I also told the acme guy I was pushing 1800 lbs and I wanted the biggest 4-blade I could get. I dont see any of the new big boats coming with 3-blades on them so why would you pick one for your boat IF you want to wakeboard. I hope this helps, as a sales guy I just try and make and keep things simple. Jet

[Ptownkid]

I will buy most of what you are saying, as a lot of it does seem to be logical...but,

Through the implementation of precision manufacturing and design improvements, Acme Propellers are giving the 3-blade the reputation it deserves. Acme is consistently holding tolerances never before achieved in propeller production. This accuracy makes the Acme 3-blade incredibly smooth. In addition, the blade area of the Acme 3-blade has been expanded to equal that of the Acme 4-blade. The translation? The Acme 3-blade has raised the performance bar. From an awesome hole-shot to an unmatched top end, and all the smoothness throughout, the Acme 3-blade leaves nothing to be desired. We believe it has an edge that everyone will appreciate. On the other hand, please do not mistake our excitement as a lack of appreciation for the Acme 4-blade, a proven winner.

and therein lies one of the big problems with internet advice, it's not always based on fact. I will however keep looking at the 4 blades based on your experience and couple that with some more reading.

[wotan2525]

Jet -- You're actually quite wrong. New CNC Acme and OJ 3-blades have the same surface area (or more) as their 4-blade equivalents. All props now have more surface area and more cupping than the props that came stock on our boats.

You're comparing an old 3-blade prop to a new 4-blade prop and then acting like that's the only difference. Even worse, you're preventing your theories as FACTS. PERIOD. They're not... they're just your opinions and the shadetree observations that you're using to form those opinions.

I've run 3-blade props and 4-blade props. 13" and 14" props. I have 3 props that have been pitched all over the place throughout the years. You know what I've learned? I can take two different 3-blade 13" props with the exact same pitch and cup specs and get wildly different performance. Props have very complex profiles and we should leave the ins and outs to the people that do nothing but deal with their specifics day in and day out.

I'm so sick of prop threads.... OP -- Please, just call Acme or OJ.

[jet]

Slow down girls..slow down..I knew I didnt want to get in this email..yall are just looking for someone to jump on. There was NO facts given in my email..just a easy way to understand it and my OPINION..back off! I know surface areas are getting close but even if they are equel..If I had 4-arms and you had 3 arms I would still kick your butt!

LMAO!!!!!!!!

[Mani]

Call Jim at Acme Propellers. He fixed me up with a 13X11 3 blade for a very decent price. It's quite an improvement over the old prop, but then again, it's the only prop change I've ever done in my boating career.

You can hear all sorts of stories on here, but in the end, you should call someone who does this for a living, and has engineers backing them up.

[Ptownkid]

Slow down girls..slow down..I knew I didnt want to get in this email..yall are just looking for someone to jump on. There was NO facts given in my email..just a easy way to understand it and my OPINION..back off! I know surface areas are getting close but even if they are equel..If I had 4-arms and you had 3 arms I would still kick your butt!

LMAO!!!!!!!!

Easy Tiger...I'm personally not looking to jump on you (at least not in the verbal sense, possibly in the literal sense, you're not a bad looking fella, lol.), but you did present the surface area thing as fact the way you worded it, and even if it's just a personal opinion, the manufacturer's documentation disagrees. That quote I pasted above is from Acme's site. So here is a fact, Acme's three blade props have an surface area EQUAL to their four blade, end of discussion. That aspect is not open for debate unless the manufacturer themselves are lying.

I did clearly point out that you opinion has given me food for thought based on your experience with a four blade, so don't get all huffy as I meant no disrespect. Just trying to get some clarity on the pros and cons and I do realise that the best place to get advice is straight from the manufacturer, but I do care what others think about the props they actually have with regards to real world performance.

Look at it this way, maybe by debating these issues we can actually present some solid factual info to future question posers...

Cheers

[Hagman]

A long time ago when I got my first new boat a (clamp on ) the dealer asked me to go home load the boat how I planed to us it and he would take several props out on the water to see which one would work the best for the way I was going to use the boat. I think this is still a good way to make your choice on a prop . All boats run out different . The same goes for props. The combo that your buddy with the same outfit has mite not work as well for you. Personally I changed to a fore blade. It seems to run just a little smoother over my best 3 blade and I think it makes the wake just a little softer.
And Ngavdba your not alone. I’m over 50, no tower the best skiing is a driver, 1/4 tank of fuel and a 6 pack with a little ice.

[supramariah#1]

Hey now. I am 32 and I love skiing and kneeboarding.

I havent seen the threads about props before. This is good stuff. I was gonna keep my prop but now... I want a new one! (thanks a lot! Now i need more money again!) I need better out of the hole performance to pull me up slalom SKIING not wakeboarding. lol Getting up on a wakeboard is like sleeping.

1.23:1 means the prop spins faster than the motor correct? Also altitude has something to do with it as well? Just asking so I know what to tell ACME or OJ when I call them.

[cadunkle]

1.23:1 is gear reduction, just like gears in your car. The first number is transmission input shaft, and the second is output shaft. So this would be read as, for every one turn of the output shaft, the input shaft turns 1.23 revolutions. Your engine RPM will always be 1.23 x shaft speed.

[jet]

A little clarity. Yes, I was speaking from going from my old 3-blade to a new 4-blade. That was my intent....and thats where I WANTED MY reply to go..my opinion..period! I overstepped talking about the NEW 3-blades because to ME they were not even a option for me. I wanted the BEST not middle of the road gains-(my opinion) The 4-Blade was the LAST big upgrade I did and it should of been the 1st thing I did. THE GAINS WERE SO INCREDIBLE!!! It was like putting a SUPERCHARGER on my engine and I want to share that with yall. I wasted so much time and so much gas and wear and tear on my engine. Lets keep this REAL simple..call your supra dealer and ask him which new model comes with a shiny new 3-Blade?? NONE!! Period!!