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  4 blade props, what's the advantage?

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Author Topic:   4 blade props, what's the advantage?
Alan Hiccock posted 03-25-2002 10:24 PM ET (US)   Profile for Alan Hiccock   Send Email to Alan Hiccock  
if any. Im in the market for a SSprop for my 15 Sport/70Yamaha , Merc has a bunch of 4 blade props { as well as other companys }
that can rehubbed to fit my yamaha.
Anyone use these 4 blade jobbies or any input on this?
thanks, alan
OutrageMan posted 03-25-2002 11:54 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
I used a Mirage Plus on my 22' Outrage and have Revolution 4 props on my Bertram.

I have experienced quicker hole shot, faster acceleration, much smoother performance, and better hoding in bigger seas.

One important thing to remember is that you are turning one more blade and increased weight, so you must go down at least 1" sometimes 2" in pitch.

Brian

lhg posted 03-26-2002 12:43 AM ET (US)     Profile for lhg    
Your Yamaha requires a 4 1/4" gearcase prop, the same size Mercury engines 75-125HP use. the "Revolution" 4 bladed props Brian is using are only made for the larger 4 3/4" gearcase V-6's and sterndrives.

In this 4 1/4" size, they only make 3 series of performance props, the 3 blade Laser II (20-26" pitch), 4 blade Trophy Plus (17-26" pitch) and 5 blade Hi-Five (20-26" pitch). The hi-five is considered the best water ski pulling prop there is, but not known for top speed. It's also a great offshore prop, fully submerged.

All of these props are now made with 4 vent hole plug options, and an interchangeable hub design for any brand of engine. Any of these will cost you about $365 new, bought right (not easy to do!). If you can turn at least 20" of pitch, I would recommend the Laser II for your rig. It is designed for light, fast boats and gives great bow lift. I use these on both of my Outrages.

If you have to go lower than 20", the Trophy Plus will work for you. They are often used on flats boats, and can be run up to 2 1/2" high.

All of these props hang on like crazy and just don't slip. But they are generally for rigs that will exceed 40 mph, and need to be run surface piercing at elevated transom heights. If you're going run them fully submerged, drop down 2" in pitch, as they take a really big "bite" with their progressive blade design.

Mercury performance props are about the best you can buy, although costly. They have a huge research and design program, and offer more designs than any other outboard manufacturer. I am seeing a lot of them used on Yamahas recently.

Best pricing you find is at offshorperformance.com, in Ft Myers FL. They ship anywhere UPS C.O.D. Quick, excellent service.

lhg posted 03-26-2002 12:45 AM ET (US)     Profile for lhg    
That's offshoreperformance.com.
russellbailey posted 03-26-2002 10:12 AM ET (US)     Profile for russellbailey  Send Email to russellbailey     
LHG,

As a followup to your post, I have a 1988 70 hp Evinrude on our 15 Striper, and we use it mainly for waterskiing. I have a 13x19" SST prop (original with boat, 1980 vintage), a 13x17" aluminum (original with 1988 motor), and a 13x15" (used for skiing with original weaker 1980 70 hp). We use the 13x17 mainly now - the old 13x15 is damaged.

I think something less than our current 17 but more than the 15 pitch is best for waterskiing for us. The tach is broken right now so I'm not sure what the WOT revs are with the two props - I know the 15 will overrev.

I'd love to get better acceleration for waterskiing. Would a 4-5 blade prop probably do better? If so, what options are there to fit my gearcase?

Alan Hiccock posted 03-26-2002 10:25 AM ET (US)     Profile for Alan Hiccock  Send Email to Alan Hiccock     
IHG,
Great post , thank you.
I was @ the Merc site checking them 4 blades & was amazed how many diff. series of em Merc sells and thier very cool looking props.
Im going to check today some @ my local merc dealer & see if they'll let me bring em back till I find the right one for my boat if need be.
Alan

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