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Mirage Plus not more uptodate ???

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Mirage Plus not more uptodate ???

Old 09-22-2021, 11:48 PM
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The Mirage Plus are on the boat and it came not in plane ??

Any idea ?



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Old 09-23-2021, 01:07 AM
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Did the drive shower bring the air to the prop ? Tape the holes ??

Should i tape the exhaust inlet ? Front and side ?

I will test it ?? No other ideas at time.
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Old 09-23-2021, 09:39 AM
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Did you try putting it in gear and giving it a lot of throttle then pulling back on throttle and then catching the wave and giving throttle again ?. The wave will sometimes give enough lift to get you on plane. only other option I can see is a 1 or 2 inch spacer on the drives. Also it looks like those props have the removable ventilation tabs. Black plastic on the side of the hubs. Try removing them.

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Old 09-23-2021, 10:10 AM
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Are they labbed ?
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Old 09-23-2021, 11:37 AM
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Blueabyss Starting with the second wave working with my Lab Bravos with the welding on tube. With this 3 Blades I donít came in plane.

The 3 Blade Mirage are not lab.

If I open the vent holes, is it not than more air and faster blowing out the props ???









I have testet today:
Close the Drive shower holes and the Exhaust hole inlet with tape.

No way to get the boat to plane.







Last edited by MikeScarab28XLT; 09-23-2021 at 11:39 AM.
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Old 09-23-2021, 12:20 PM
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Old 09-23-2021, 12:29 PM
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Originally Posted by MikeScarab28XLT View Post
Hello im tinking about buying a new Set Mirage Plus.

Yes i use long years Bravo Props but i remeber the time most used props befor Bravo are Mirage, than Mirage Plus came out.
For 20 years most boats used 3 blade Mirage Props. Than the Bravo came out with "Mercruiser Bravo I" on it. Some years later "Mecury Marine Bravo I" on it and today many versions are available, LAB, ProFinish, LT, XS, OC, FS, XC......
If we testet Bravo Props from a Mirage we used -1" to the Bravo Prop. 25" Mirage to 24" Bravo, most of the time the Bravo are a little bit slower, but the all-round are better, so we stay most with the Bravo. But the Mirage are usaully faster.

Now i own 20 years same boat. 1991 V-Hull with first 454MAG, than 502EFI, now 525EFI twin engines Bravo Drive. Boat came with 454MAG and 25" Mirage and than i switched to Bravo Props 26" , 28"LAB with the 502EFI and than 29"LAB 31" LAB with the 525EFI engines. The 31" / 5200 and the 29" / 5400 on flat water 1mph diffrence.

" Thank you to BBlades, the 31" are very very nice Props !! "

The 31" to big on the flat water, with some white water i thing the engines can turn the props more and this are nice props fŁr Poker Runs.
The 29" are my fastest props with this old non stepped hull.

My idea are the have a prop with less diameter and same pitch. Something like Hydromotive 15X29, but they are not to find for XR shafts.
But the old Mirage Plus last pitch are 15x29" but only 3 blade are new available. With the old -1" the 29" Mirage are like a 28" Bravo ore more like a 29" Lab Bravo ??????????

Now the question, what do you think ?

Mirage Plus 15x29" worth to test ? LH are 250$ new at time, 500$ the RH version.












Mike,

I have read this thread about five times, and can't find anywhere where you've indicated....

Why is the boat not planing? Is it just refusing to plane out? Engines not spooling up? Props blowing out?

You've had this boat for 20+ years, so you know it better than anybody. When did this behavior develop? What changes did you make just prior to the onset? When did the XRs go on? Did they come with the shorty lowers? If not, when did they go on? Why the shorties?

My guess is that the boat is fastest with the Mirage Plus props because they are not inducing near as much transom lift, and the boat is allowed to run much drier, with less wetted surface. We went through this with our 236 Rinker. We bought it with a 22" Bravo that had been labbed to 21". The most we could get out of it was 50MPH, despite an engine dyno'd at 436HP. My dad noticed the boat was plowing when on plane. We swapped to a 23" Mirage Plus, and gained 11MPH. We also gained a lot better planing behavior. As a rule, non-stepped hulls don't really like lifting props.

Just some questions and some thoughts....

Thanks. Brad.
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Old 09-23-2021, 01:25 PM
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thanks Brad for reading and helping.


I changed to the shortyís with my 502efi setup and the boat was a little bit slower ( because with many trim the torpedo goes down, now Iím faster and need less trim, more straight) but better in handling. No jumping, more straight thrust, no wiping. Since this shortys i canít not go in plane with 3 blade props. With Standard the 3 blades have no problem. Now I run with new motors faster and the shortys are great in handling. I have new lower XR with 0 hour but I donít now if it is useful with mirage ??
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Old 09-23-2021, 06:23 PM
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Your picture "A"



Your picture "A" zoomed in.



Your picture "B"



Yoir picture "B" zoomed in.



These last 2 pictures for camparison, from blue line up to cavitation plate.



Zoomed in, this drive is raised 3 3/8 inches. The blue line is runs down the keel of the boat.



my opinion is not that your prop shaft is raised 2 inches, but the difference in shape of the lower unit from the blue line up between the two different lowers. Stock and minus 2

I tried to zoom your pictures in on the end of the lower where it is wide and shaped like an i beam.

that section all the way to the leading edge of the lower is causing you to blow out and not get on plane.
(my opinion)


This is bad news that you couldn't get on plane, those mirage plus are good props.
Do you still have the stock lowers ?

It would be interesting to know your propellor shaft height.

edit in; it wouldn't hurt to try spinning the propellors out, it may not work, but it's a free test.

Last edited by outonsafari; 09-23-2021 at 06:28 PM.
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Old 09-24-2021, 12:22 AM
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Thats old pictures with and without -2".
I will check today the x-dimension.






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