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Author Topic:   4 blade aluminum props
Montauk posted 01-10-2003 01:12 PM ET (US)   Profile for Montauk   Send Email to Montauk  
Anyone know of a good 4 blade aluminum prop? I am looking for a 13-1/4 x 15 or 16P, 4 blade to run on a 90 hp yamaha/73' Montauk with CMC power jack plate. This boat will be run on the flats around Boca Grande, FL and on a stump and rock filled resevoir in WI. I am not interested in top end performance so do not need a stainless prop. Thanks
John W posted 01-10-2003 02:06 PM ET (US)     Profile for John W  Send Email to John W     
Boca Grande, my summer stomping grounds. If you do much shallow water fishing down there, a stainless prop will pay for itself in no time, as the aluminum ones will shred the first time you bump a sandbar but a stainless one won't be affected at all. Using stainless props for shallow water in southwest FL has saved me a ton of money over the years in not having to replace shredded aluminum props. I can see where aluminum might be adviseable around the rocks in WI, though...better a shredded prop than a shredded motor.

If you go with stainless, Stilletto & Power Tech both make 4 blade props for smaller gearcases, I think they'll fit a Yamaha 90, and are available down to a 13 or 15 pitch. The only 4 blade aluminum props I've seen are in the Bass Pro Shops catalog, but I don't know of anyone who has one & I've got no idea if they're any good.

Montauk posted 01-10-2003 02:52 PM ET (US)     Profile for Montauk  Send Email to Montauk     
John,
I have been looking at Power tech ss 4 blade props but am concerned with hitting immovable objects in dark water and ruining a prop shaft. I have used an aluminum 3 blade around Boca Grande and ran aground at speed outside a tricky channel, prop damage was minimal, just wore it down slightly, not enough to change the rpm's at WOT.
I might get the powertech SS for FL and The lakes I know well and get an aluminum for the flowages and dark water lakes. Not very cost effective, but then again a power jack plate on a montauk isn't cost effective either... I will check Bass Pro for aluminum.

Dick posted 01-10-2003 03:14 PM ET (US)     Profile for Dick  Send Email to Dick     
Mercury makes both aluminum and stainless 4 blade props. They are available with hubs to fit most motors. The hubs are designed to break away befor any engine damage happens.
Stay away from any prop that has a solid hub.
Dick
Bigshot posted 01-10-2003 03:35 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
With a 90 on a 17'...a 4 blade will not do doodoo over a 3 blade. That is why they are hard to find because the people at Mercury, etc think there is no advabntage to do so. With my Yamagucci I had an OEM 17" SS and she was PERFECT. 5500 on a good day. 53-5400 with 2 people and full tank, does not get any better than that.
j_h_nimrod posted 01-10-2003 04:28 PM ET (US)     Profile for j_h_nimrod  Send Email to j_h_nimrod     
With the four blade you should be able to run the motor slightly higher. We had a 115 short shaft (should have been long) on a 22' welded alum. boat that ran much better with a 4 blade. The Yamaha website has a section about prop. design explaining this.

http://www.yamaha-motor.com/accessories/otb/propellers01.html

lhg posted 01-10-2003 06:56 PM ET (US)     Profile for lhg    
I'm not aware of any 4-bladed aluminum props made for the mid-size 4 1/4" gearcases.

Mercury recently introduced 4 blade aluminum props for the V-6 & Sterndrive market, but only in the large 4 3/4" gearcase. You can even get them in CR.

DanT posted 01-10-2003 10:00 PM ET (US)     Profile for DanT  Send Email to DanT     
Solas makes 4 blade aluminum props that will fit a 90hp Yamaha. I don't have one of their props but I did check them out on their web site a while back. www.solas.com
Montauk posted 01-10-2003 11:24 PM ET (US)     Profile for Montauk  Send Email to Montauk     
Nimrod, thanks for the info, looks like yamaha feels certain applications can benefit from a four blade prop.
Bigshot, On a fixed jackplate the 17p 3 blade OEM prop does a fine job, but 5300-5400 with two people and a full tank(28 gals.)of fuel is not perfect! Add in 15 gal. livewell+ trolling motor+ group 27 battery + casting platform + 6 fishing poles + two tackle boxes and a cooler of ice, now 5600 rpm's is perfect. Mercury might not see a finacial reason to build a 4 blade prop for the mid range engines yet, but better gas economy, superior holeshot at higher jackplate(power) settings, less vibration on a 3 cyl. engine, and low and mid range throttle response mean a lot to me. Much of my vacation boating is done in rougher water(FL and Lake Superior), I have found that the jackplate setback enhances the ride on the smirkless Montauk, however it is important to maintain plane at a slower speed and that is where a 4 blade should help. According to the Powertech factory rep I spoke with today I should gain 1-2" of overall boat lift which is important on the flats. The downside is I will lose 1-2 miles per hour top speed, really not much of a loss for all that can be gained. When you have short hair, poor hearing and don't look at the speedo at WOT it is hard to tell if you are 1-2 mph slower!
DanT, The Solas dealer I called today was at the boat show, glad to hear they have a 4 blade to fit the yamaha 90. It will be interesting to see if they have a prop for my application.
reelescape1 posted 01-11-2003 08:23 AM ET (US)     Profile for reelescape1  Send Email to reelescape1     
Look at Comprop
Bigshot posted 01-13-2003 09:24 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I have a comprop 17" and I will say that it leaves a lot to be desired. usually you drop pitch on a 4 blade, with the 17" comprop I need a 19". I keep it for a spare but like I said...get the bigger prop.

Montauk that Yamaha redlines at 5500 so doing 5600 is not ideal.

Montauk posted 01-13-2003 12:47 PM ET (US)     Profile for Montauk  Send Email to Montauk     
Bigshot,
My bad! Right you are, 5500 rpm is correct.
John W posted 01-14-2003 09:39 AM ET (US)     Profile for John W  Send Email to John W     
Montauk, I ran the Power Tech prop on my non-whaler boat & was impressed, it helped the midrange handling & eliminated some blow-out problems I was having in turns. I didn't lose much of anything at top end, but again this is on a different boat so your results would probably be different. It has vent holes (like some of the Merc props), which should really help your holeshot acceleration on that small displacement 3 cyl motor. Only downside is the cost. I haven't tried the 4 blade SS Stilletto, but it's available for less money through Overton's.

Montauk posted 01-14-2003 06:10 PM ET (US)     Profile for Montauk  Send Email to Montauk     
I checked the 4 blade Stilleto price in Overton's, about $80 higher than forum member JT's price on a Power tech 4 blade! JT has some great prices on Power Tech props at 30% off. See his thread on this forum.

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