Anyone tried Mercury Maximus 5-blade prop?
 

Just curious if anyone has tried the new Mercury Maximus 5-blade prop or know of anyone who has?

I have a 28 Daytona with twins and just curious if they would benefit this boat?

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Hopefully in 2 weeks we will be trying a set on 28 daytona. So far we have tried about 5 or 6 different props & the best so far is his orginall 32 labed bravo 1

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Turbojack- What power in the 28 and is it a tall deck or lp? Boxes or shorties? What props have you tried and their pitch?

I have been considering a set of 32 labbed Bravo's myself. I'm mainly looking for better mid-range between 3000-4000 rpm's. I'm not sure the 32 labs will do that, they may just give more slip at mid-range with no improvement over stock Bravo 30's, which is what I'm currently running.

FYI, I have 496 ho's in my 28 TD.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Harper, you'll loose a lot of acceleration going to 32's even labbed. I would lab your 30's...if you're on the limiters get them bumped up.

I ran a set of labbed 33's on my TD 28 last yr (500EFI's) and had almost no acceleration...although on the very top they were slightly faster due to my 30's being on the rev limiters. That was with no boxes. I put boxes on this yr and just had the limiters raised so I could continue running the 30's for the mid range. I'll let you know next week how much I pick up with the boxes, based on how easily it hits the limiters before I had them raised, I think it will pick up at least 5mph with the boxes. (std length lowers for now)

I turn mine IN, but I've heard they are slightly faster turning OUT....however you will pick up a porpose in the 60-80 range.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Hey Guys. I have a 1999 28 TD that I bought this year. The best I have seen on GPS Spedo is 95 @ 5050 rpm. The boat has 2 HP500's carbs with 300 hours on them. It is turning 2 bran new stock Bravo1 4 blade 30p & they are turning in. I tried them turning out and got a really bad planing time because they were blowing out even under light throttle and the best top speed was 92. Any way I sent them out to John York at York propeller to get lab finished. He was the only guy that Eliminator recommended. The service manager told me that they send all there race boat props to him. He said he could get 200 more rpms by labing them and no pitch change. That would put me @5250 rpm which is where the rev limiter is on these engines. My question is 95@ 5050rpm seem a little weak to me? Do you guys have boat model, engine model, prop size/ rpm's and top speed on GPS to share?

Also I got the best speed of 95 with just myself in the boat and 1/4 tanks of fuel. The guy I bought the boat from claims 100 mph but he put 5K worth of high end audio equipment in the boat right before he put it up for sale do to a divorce. He put 2 12" sub woffers in enclosures up in the bow and 3 Rockford Fosgate amps behind the lounge seat in the cabin. Those items weigh about 200lbs and I wonder if it is hurting my top speed with all that weight in the nose? Any help would be greatly appreciated.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

NJDAVE;

My boat has a big stereo as well with Rockford 15" s in the front in boxes and 3 amps up front. While extra weight certainly doesn't help I don't think its much of a factor with twin big blocks as it might be with say outboards. Probaly less than 1mph. My 00' 28' TD runs 95GPS with 30 Bravo's on the limiters @5200 any weather any fuel level, but pretty strung out to get there. I turned 33 labs 4900 for a best of 98GPS last yr. That was with 2/3 fuel and ~85 degrees and high humidity, flat water. We ran 93GPS with 6 people on the same day with the 33's.

Boxes: plane much easier than before, get me to 95 easily, now and have to pull back to ~85% to stay off the limiters....which just got raised. I will say as a general comment that when the fuel gets down to 1/4 tank and (2) people the boat accelerates much better as you would expect. One thing I found is my 28 has 2X80 gallon tanks according to the data on the tanks vs the 2X70 gallons its supposed to have.

Keep in mind Eliminator puts their drive heights and motor seperations all over the place which makes a difference in how they run. Mine has the "wider" seperation and while I've never measured it, the drives are ~even to 1" below to the bottom of the boat eyeballing it.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Thanks JD. I would like to talk to you on the phone.You can call my cell @ 201-394-8391 or I can call you. thanks

Re: Anyone tried Mercury Maximus 5-blade prop?
 

We have a customer we have been working with who has a 28 Daytona with the 496 mag (non HO).

We tested several different props on his boat. These are the results we got;
Bravo 1 30 stock 88@4800
Hyrdromotive Quad IVX stock 89@4800
Hydro P5X 29 stock (test props) 88@4800 (cruise speed @3500 went up 7 mph)
Maximus 28 82@4400 (this was done without me present so I don't know if it was stock or not)
Hydro P5X 29 stock (production) 88.3@4600

Of course you would expect more with the 496HO or HP 500 motor. The 5 blade props got up on plane with no "blowout" at all and had a cruise speed about 7 mph higher than the stock 30 Bravo 1's. Top speed with the P5X was the same as the Bravo 1 as well. Quad IVX runs about the same top end speed as a lab finished Bravo 1 but the problem has been just what JDNCA1 mentioned. With the various drive heights sometimes it is difficult to get on plane with 4 blade props.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Hi Julie- It's Todd in Iowa, I've talked to you about the P5X's for my 2001 28 Daytona with 496 HO's. Looks like the Maximus bit the bullet on top end, I can't imagine what the mid-range would be. From our previous conversations, you know that I'm looking for the mid-range gains, better hole shot, all while maintaining top end and if you're certain that this boat and prop combination netted 7 more mph at cruise then I would be sold.

Right now I'm pushing 60 mph at 3500 rpm. 70-72 mph at 4000 rpm, this is where the boat really starts to lift, so I could see a huge gain at around 4000 rpm with the efficiency of the boat and the prop combination. I'm guessing 80 mph at 4000 rpm, that would rock! Right now I'm bumpin 5000 rpm with stock Bravo 30's at 92-94 mph. I would sure like to hear testimony from the owner of the 28 Daytona that you tested. Then I would probably buy a set. What pitch would you recommend for my 28 Daytona with twin 496 HO's, considering the 28 Daytona you tested had 496 non HO's and ran 29p P5X's at 4800 rpm? With the HO's I should be able to turn the 29's up to 5000. Do you have 29's available?

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Dave- I can't imagine that an extra 200 lbs would chop off 5 mph. I would assume he was fibbing about the top speed to begin with.

I had a monster Adire audio 12" Brahma sub-woofer way up front in cuddy and had it stolen along with one amp. I then added two TREO TSX 12" subs in sealed boxes and placed them under the driver and passenger seats in cockpit and they absolutely rock compared to having the subs in the cuddy. Night and day difference! You should consider this if you want about 10 times the output out of your system and also distribute the weight more evenly... Just a thought.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Boat is a 2000 tall deck with a big bowrider in front. Has 2-454 efi mags with stage 1 prochargers 5lbs of boost. No standoff boxes. Best speed to date has been 97 or 98. It had regular drives, he just installed 2" shorties & did not see a speed increase. With the shorties the center line of the prop is now above the sponson. Has tried some bravo 30, 32, & 34's, & some 5 blades but not sure what ones. Planing on also trying some Hydro 27 5px's The motors are getting tired since they are 5 years old & have had the - - - run out of them. Top speed these days is 93 & looks like no mater what prop is used still same top speed. Only RPM & takeoff changes.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

well I think I am convinced that a 28 eliminator daytona cat with 425 to 500 horse power is not going to reach 100mph on gps (which does noes not lie) is not attainable. So we have to ask our selfs is a solid 95 on GPS is acceptable or are we trying for the impossible of 100gps with no engine up grades attainable? I think that more hp's is the only way to get their and you know what they say if you want to play you have to pay. Whipple's is the only way I see to to go and that would include upgrading the drives so that would co$t about 12K conservatively to get to low 110 with Whipple's and drive upgrades, but 20 mph's is HUGE in high performance boating so we Eliminator Daytona owners are going to have to pay up to play with the big boys or keep trying to find 1-2 mph here and there and still pay big time with no big gains.THE TRUTH SUCKS !!!!!!!!!!

Re: Anyone tried Mercury Maximus 5-blade prop?
 

NJ, I think 100GPS is very attainable with 500's, I'll let you know after this weekend with the raised rev limiters. Hell if you believe all the Magazine articles they can do it with 496's.... :drink: even in the 33 daytona's :drink: :drink: Maybe in race form.....Anyway, would love to chat. I'll get with you next week.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Ran them on a friends Cig with 575's, got out of the hole great. A lot of bow lift when turning in. Mid range was incredible. Overall I liked them.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Just as JDNCA1 says, Eliminator puts the drives on the 28 in different spots.

I think you will need the rev limited adjusted to get the 500s to the 100 mark. Otherwise it will take 525 to 550 hp to get there on a regular basis.

JDNCA1 - Did your boxes extend into the tunnel? Good luck with your testing. I hope to try my 34s this weekend and David is trying 36s.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Rbtnt;

After looking again, the boxes did extend into the tunnel about 1/2 inch. Looking forward to seeing what she'll do with the rev limiters bumped with the 30 bravo's. I may try a set of clevers after that which made 33Daytona's boat FLY.....I just don't know if I'll be able to turn them hard enough. My drives are deep enough to get on plane with them...I think.

Good luck with your testing as well, look forward to seeing you all again. Let me know how it goes. Have you thought about running in the tennesseriverrally? It's July 16-17. I ran it last yr and enjoyed it despite the weather being horrible. I'm planning on doing it again and will probably get a few others from Cincy to head down.

Corey

Re: Anyone tried Mercury Maximus 5-blade prop?
 

I think if one spent the time 100 with hp 500's should not be a big deal. There are so many set up changes that can be made speed gains of 5-7 mph could be obtained through weight distribution, drive lower selection and height, hull blueprinting, extension boxes, props, etc.
The boats in the Super cat light class attain speeds in excess of 120 regularly with stock, sealed 525's with a minimum weight of 8000#. I would have to believe that a 28 eliminator with the right setup with hp 500's or less could run at 100. It just takes time to get the boat set up just right.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Todd,

We have the 29 P5X's in stock. There still isn't anything larger available. In your case you could spin the HO motors about 400 higher so the same pitch prop should get you a top end speed of about 94.

Weight in the wrong place can reduce top end speed substantially. Likewise adding weight in the right area can increase speed substantially. Adding just 120# to the bow of a Super V boat we work with increased the top end speed 4 mph. We had another customer who moved 50# from the bow to the transom of a single engine boat and increased top end by 15 mph. These are extreme examples of what effect weight can have but weight in the right place can make a lot of difference!!!

Matt

Re: Anyone tried Mercury Maximus 5-blade prop?
 

UPDATE:

Ran 98 gps @5500 with a TON of trim, 30 bravos. 1/4 fuel, hot and sticky with good chop, 3 people. On a cool fall day it has 100 in it. The boat needs shortys BAD, it threw almost no rooster at speed with lots of trim (7-8 on the bluewater) I would say it picked up a couple with the boxes...remember I was hitting the limiters before with the same props but it was just about done. IMO shortys will put another 3 to 5+ on it which will be solidly over the century mark.

Plan to try some hydromotives and maybe some clevers first though.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Everyone is to used to talking just horsepower numbers and props. You need to build the torque levels past the 4200rpm to 4400rpm levels they are probably at in most of your motors now. More torque at higher rpms with the right prop and a decent "x" dimension will let you turn your rpms up and gain that extra spped you are looking for.
Raylar

Re: Anyone tried Mercury Maximus 5-blade prop?
 

JD I think you have more prop slip now than before because if you are turning 5500 and getting 98 that is about 15% slip. Maybe too much trim. I only trim up to 4 max on the bluewater's. 7 seems way out .

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Dave;

I"m with you on 7 being way too much...but the more I put into it the faster it wanted to go...to a point. If my slip didn't go up, 5500 rpm should have run the number. At 4-5 the boat just didn't want to put up any more speed than 96 so I purposly overtrimmed to try breaking the boat loose then bumped the drives back down. When I went back down to 5-6 it wouldn't put on any more speed than when I was at 7 and actually slowed down when I went back to the 4-5 range. I had almost no roosters even when trimmed to 7.

I think the boat needs shortys as I should not have to trim that much.

My Carrera threw a hell of a rooster with the drive only slightly trimmed (no mechanical indicator, but similar to like a 2 on the bluewater)...the X was very high on it.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

I am going to try trimming my boat out to 7 just to see what it will do. I am awaiting my new lab 30p bravo1 props to see if my rpms can get me above 5050. That is all I could get with stock bravo1's not labbed. My speed was 95 on GPS.I do not have extension boxes so I will let you know what happens trimming it to 7. I looked at the drives with the boat not running and the drives at 7 do not look that far out so maybe you are on to something. It seems like some people here are claiming the same speed with only 496ho's which are 75 less horse's each. So either I am down on power on both of my HP500's or my drives are in a bad spot or my labed props will really make a big difference. Time will tell. I am also going to check my ignition timing to see if it is a little retarded. I have seen that make a big difference.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

NJDAVE, I'm certain that there's only a 45 hp difference between the HP500 and the 496 HO, 470 vs. 425. I'm a few mph shy of what you're getting for top end with the 496 HO's and stock Bravo 30's.

My drives are on the high side with no boxes, which might explain the close speeds. There are so many variables that could pick up a few mph or drop a few mph and they've all pretty much been laid out in this thread. I've come to the conclusion that it's not all about WOT and top end, that's for racing, ego's and bragging rights.

I think some of us will beat their head against the wall for 2 more mph at WOT and spend immense amounts of money and loose performance in every other area. How often are you at WOT? 2 secs?? It's not worth the worry or the money.

I'm going for the 7 mph gain in the 3500 rpm cruise arena where 90% of boating is done. The more I read, Hydromotive P5X has made this a reality.
Now that's some smart boating!

Re: Anyone tried Mercury Maximus 5-blade prop?
 

If you are running a 1.36, and 30 p b-1 @ 5250 you should find these numbers useful.

1.36 30P @5250:

101mph@8% slip

99mph@10%slip

97mph@12% slip

95mph@14% slip



If you have them labbed you should also have them add a little more cup at the outer part of the blade. This should allow you to bring your trim back to normal or at least closer to normal and also get that slip back down. Or try a labbed and maybe slightly clipped 32p. My 0.02. :rolleyes:

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Scarab I agree with your numbers. I have a best speed of 95 mph at 5050 rpm
and that equates to 10% Slip. So after the labbing if I get 250 rpms I would be at 5300 rpms and at 10% slip that is 99.6 and I am happy with that as my goal is 100 mph. Harper220 I think you might be wrong. The 496ho's are 425 hp's at the crank shaft and the HP500's are 500 hps at the crank shaft and 470 hps at the Prop shaft. I do not know what the 496 ho's hp's are at the prop shaft but I would guess that the Bravo drive robs 30 hp so you would logically be at 395 hps at the prop shaft. 75 hps per engine at the prop or the crank does not really mater but I agree that 7mph at cruise is allot more practical than 3-5 at WOT. But as you know bragging rights and Egos are still human nature and it feels good to say my boat go's 100MPH.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

NJDAVE, I'll put it this way, I know for a fact that the 496 HO's are rated at 425 hp to the prop shaft. This motor replaced the 502 mag mpi in 2000 which was rated at 415 to the prop shaft. The standard 496 is rated at 375 hp at the prop shaft.

Visit:
http://www.mercurymarine.com/496_mag...ut_sd_-_425_hp

I wish my boat would go a hundred, but that's not a reality with 496 HO's and just some prop work. Or, I could tear out all the seats, interior, stereo and low fuel and see what happens? HA!! Maybe next year the aluminum heads by Raylar or superchargers and then some new props.

It would be nice if I could just be satisfied with the way my boat runs now and just enjoy it, but hell no.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Corey,

I was trying to figure out how the boxes could be 2" from the tunnel. Thanks for looking again. This was our first good weekend of running and the 34" props did not work out. They blow out too easy when rolling over and the acceleration above 85 was flat. I guess I will stick to spinning 5800 on the top end.

I have tried changing the weight in mine and it made very little difference. My friend has done the same with his and had the same results. I normally have a futon, tool box, porta pot, tops, 20 lbs of MSD spare parts, cooler and other misc crap in the boat. It runs about the same with or without all this junk and the amount of fuel makes a little difference.

I would love to see you guys in the 28s run triple digits anytime you want on stock power.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

My port motor went down about 200rpm this past weekend and when I came down to idle there was the dreaded ticking noise from excessive lash. Pulled the valve cover and the #7 exhaust rocker polylock had gotten loose and messed up the threads slightly on the stud. Didn't appear to hurt the rocker or pushrod. With that 200rpm on the port motor, 100 might still be in the cards with the 30's.

Randy, I have a set of labbed 33 Bravo's. If you want to try them sometime let me know. They were faster last yr, but my 500's just didn't have the ass to pull them in the mid range. I think shortys will put me solidly over 100 as my drives are not that high with the boxes.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Harper220 here is the same link to the HP500's

http://www.mercurymarine.com/8226hp500_efi_-_500_hp

this states 500 horse power but it does not specify at the crank or the prop shaft? Just the facts!!!!!!!!!

Re: Anyone tried Mercury Maximus 5-blade prop?
 

UPDATE:

After fixing the Poly lock / rocker stud boat ran 102MPH GPS on Brookville lake today. Temp was 80, lake choppy, turned 30 bravos IN, 5600. Stock 500EFI's with bumped rev limiters.

Ran 102 into the wind twice, (~10mph) ran 100 downwind. I was stoked to say the least and actually didn't believe the first pass @102 that's why I had to do it again.

Next test: Hydromotives.

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Corey,

Nice results. Are you going to be at the Cincy Pokerrun? If so, could I try the 33s while I'm there?

Thanks,
Randy

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Randy;

Can't make this years run, have a bachelor party (not mine) in put-in-bay. You are still more than welcome to try the 33's, it shouldn't be any problem getting them down to you. Are you coming in on Friday?

Corey

Re: Anyone tried Mercury Maximus 5-blade prop?
 

Corey,

I should get there around 2:00 Friday. I can meet you somewhere to get them. What a great place (PIB) for a bachelor party.

I probably won't test them until Sunday morning. I can drop them off somewhere before noon on Sunday, or if you have boxes. I will ship them to you on Monday.

Thanks,
Randy