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Restoration Discussions This forum is discussing restorations, as well as for threads with detailed photos of the various steps of a restoration.

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Old 02-09-2018, 09:04 PM   #281
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Originally Posted by DropTop5.0 View Post
Very cool JP. From a cost perspective, Iíve been considering the same setup. Seems like the old EFIís are pretty bullet proof but also quite thirsty.

What do you think it would take to get your slip numbers down to around 12%?
Going to a 4 blade prop with more diameter and pitch is going to be the ticket. It's may a few different props trials to get it right but I think some Bravo One 28's would probably do the trick. I think the 30's will be too big but I'm going to try them anyway.
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Old 02-09-2018, 09:09 PM   #282
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Originally Posted by Sam I am View Post
I had a 175 EFI and it was THIRSTY! Not as bad as my carbed Yamaha, but man o man.

Jup, my OCD is kicking in and the blue decals on the motors are killing me...love seeing the videos of being on the water though!

https://www.ebay.com/itm/1999-04-Mer...ZYkVga&vxp=mtr
Thanks for the red decal lead. I think I'll have to order them!!
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Old 02-09-2018, 09:54 PM   #283
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'Bravo One 28's'

Steve, I loved my 28 Bravos (w- vent holes) on my 30' OB. They hooked up great, handled like on rails, carried the bow nice in the chop, and were only a few mph off a set of worked choppers!

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Old 02-10-2018, 01:35 PM   #284
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I remember Ramifications getting some props from BBlades (lease / loan program) and they looked like choppers but were 4 blades. I do not know anything about prop dynamics but it seems like over the hub would have more blade to cut through the water than a though hub. Might be something to try someday.

It seems like the IO boats love the Bravos so this will be a nice test. If you can't spin them 30's, you'll just have to add more power.
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Old 02-10-2018, 01:54 PM   #285
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Originally Posted by JUPITER PULSARE View Post
Going to a 4 blade prop with more diameter and pitch is going to be the ticket. It's may a few different props trials to get it right but I think some Bravo One 28's would probably do the trick. I think the 30's will be too big but I'm going to try them anyway.
I tried 26" Bravo 1's on my Fla Sonic, after reading the raves about them.
What a PIA.
Started w/a great deal on a pair of virgin wheels but didnt realize they had no vent holes. Boat would barely plane!

Added holes and cured that.

Then took full up trim to carry the bow and it hopped while doing so.

Cut 70% of the lip at rear of hub and cured 90% of that.

They were still several off a pair of stock 26" Rakers (similar to Mirages) and were way too much everywhere else.
Was told the Bravos are bigger than advertised.
Would have liked to try a pair of 24's.

I just played w/your #'s in the prop calculator and agree with droptop.

Using your #'s (erroring to the good), @ 5800 and changing nothing but your slip to 9% you p/u 7 - 8 MPH, or 74 MPH and 77 @ 6K!

My Fla Sonic never ran like my Ohio Sonic, dont know why but the Ohio boat was my benchmark.
Of all the boats Ive re-rigged, repowered, none ran like that boat.

W/26" Choppers @ 6400 and 9% ship, that boat ran 80 GPS and 78/79 w/26" Rakers.
I called Hoss propeller to order a set of their Hyperdrive (Chopper) wheels.
They asked my #'s and could hear them working a calculator on their side.

Got back on phone and said thanks for thinking of them but had nothing to improve what I already had.

!0% slip has always been my target and thats harder to hit than most know.

Everything I tried after the fact, slowed it down.
So that was the one and only boat that I nailed from the start.

I experimented w/set back, height, prop rotation, nose cones, toe in/out tons of props etc.
Nothing improved the orig #'s.
Also proved 90% of legend, wrong.

Not knowing your set up, Id look at engine height.
A mistake I see a lot of people making on heavier boats is raising the motors too high.
Just read a great article describing that.
Heavier the rig, deeper the wheels must be to get bite to carry the weight.

We tested that on the Ohio Sonic. Had a buddy crew for me and we went up 1/2" at a time on its manual plates.
First 1" did nothing. Third 1/2" raised RPM's w/no change to speed, thereby increasing slip.
Raised them a fourth 1/2" and the RPMs raised again, this time scrubbing speed.
Also went from neutral trim carrying the bow to requiring full up trim.
1/2 a day at the ramp poved we were there when we go there.

Your boat should fly w/Choppers.
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Last edited by Instigator; 02-10-2018 at 02:06 PM.
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Old 02-10-2018, 11:51 PM   #286
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Jup, if you find that the Bravo 1 30s are too much pitch, I may consider taking them off your hands if you decide to sell. I'm easily hitting the rev limiters at 6400/6500rpm with the Bravo one 27s with the 1.75:1 gear case 350 Vrods at 82GPS. I didn't get enough seat time last year to try other props yet but anxious to do so with anything above the 27Ps.
Ramifications has a set of 28P choppers I'm also gonna try which gets him to 82GPS with his setup. I have a few months of wishful thinking before the weather turns.
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Old 02-11-2018, 06:15 PM   #287
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Quote:
Originally Posted by DropTop5.0 View Post
I remember Ramifications getting some props from BBlades (lease / loan program) and they looked like choppers but were 4 blades. I do not know anything about prop dynamics but it seems like over the hub would have more blade to cut through the water than a though hub. Might be something to try someday.

It seems like the IO boats love the Bravos so this will be a nice test. If you can't spin them 30's, you'll just have to add more power.
Over the hub does not have more blade. You have to remember that the diameter of the gear case blocks water flow from reaching the part of the prop close to the hub at high speeds. Over the hub will help with out of the hole acceleration. The biggest influence on props is blade shape, cup, pitch and diameter. The choppers are very light and therefore spool up quickly but don't have great efficiency on heavier boats.
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Old 02-11-2018, 06:16 PM   #288
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I have a feeling the 30 pitch Bravos will be a lot of wheel for the setup to spin efficiently. Once I got the height setup dialed in for my boat with little trim needed to carry the bow, I could spin my 26 choppers easily to the limiters but the 26 Bravo 1ís not so easily. I had my 26 bravos labbed and tweaked to 27ís and can get still get them to the raised limiters (6900 rpm with modified 300 Vrods 1.85 lowers) with a lighter load. The best speed performing props I have run are the 28 labbed choppers and like chuck said, I had a best of 82 with 4 adults, 2 children and 60ish gallons of gas on the limiters. I think I will try 30 choppers this year and hope for 86-89. Although I have no real experience with your particular setup, I would try to find a set of 26-27 bravoís to get a baseline from and would think they will be right were you need to be. Good luck!
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Old 02-13-2018, 12:07 PM   #289
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I have a feeling the 30 pitch Bravos will be a lot of wheel for the setup to spin efficiently. Once I got the height setup dialed in for my boat with little trim needed to carry the bow, I could spin my 26 choppers easily to the limiters but the 26 Bravo 1ís not so easily. I had my 26 bravos labbed and tweaked to 27ís and can get still get them to the raised limiters (6900 rpm with modified 300 Vrods 1.85 lowers) with a lighter load. The best speed performing props I have run are the 28 labbed choppers and like chuck said, I had a best of 82 with 4 adults, 2 children and 60ish gallons of gas on the limiters. I think I will try 30 choppers this year and hope for 86-89. Although I have no real experience with your particular setup, I would try to find a set of 26-27 bravoís to get a baseline from and would think they will be right were you need to be. Good luck!
I tried the Bravo 30's once but that was with the carb motors (no low water pickups) when I had the motors mounted to high. Never got to ring them out because I was losing water pressure but I had no problem jumping on plane and running up to 70ish before backing out...
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Old 02-13-2018, 04:21 PM   #290
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Don't forget about the Bravo I LT's (long tubes) made specifically to aid in carrying stern heavy boats while still carrying the bow. These were aimed at Multi-Specie guys (Ranger 621 and Nitro ZV21) running 350's on heavy and loaded boats.

http://checkmate-boats.com/forums/sh...ad.php?t=32658

http://www.mercuryracing.com/boat-pr...rd/bravo-i-lt/

http://www.mercuryracing.com/wp-cont...I_LT_SS_LR.pdf


New models all the way up to 29"
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