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Mercury Revolution 4 project prop.

Old 11-09-2012, 09:03 AM
  #21  
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Mercurys new bravo fs has a cut barrel already and has performed well on boats that were running rev 4's. Some guys are seeing better Preformance all around.
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Old 11-09-2012, 10:31 AM
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Originally Posted by Mr. Demeanor View Post
Phase II will be a back cut that Rich at Leading Edge Propeller does to the Rev4. If you have questions about the back cut, ask Ken at Propgods who can provide more info.
Rich did the cut on my outers, at Ken's suggestion. Looked great, worked great, quick service.

to Rich and Ken-

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Old 11-09-2012, 10:36 AM
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Originally Posted by land crab View Post
Mercurys new bravo fs has a cut barrel already and has performed well on boats that were running rev 4's. Some guys are seeing better Preformance all around.
Problem with the Bravo is it doesnt come in the smaller pitch sizes needed by many of us.
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Old 11-09-2012, 12:33 PM
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Chris,
How did you decide on a 1" cut? I see someone posted that they did 1/4" cuts looking for better performance. How does that work?
Dale
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Old 11-09-2012, 01:47 PM
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I asked Rich at Leading Edge propeller what he would recommend and it also exactly matched the length of the tube on my Hydromotive prop..

Oh yeah, welcome to the "other" board Dale.
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Old 12-27-2012, 06:24 PM
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Finally ran the Rev4 with a cut tube back to back with a stock 19 Rev4.

First off, my boat has a lot of natural bow lift and generally does not like bow lifting props. A Mercury Tempest was the absolute worst prop I have run on my boat.

By cutting the tube down, we essentially created a 4 blade Tempest so I am not surprised that it did not run well.

19 pitch Mercury Rev4 w/cut tube: 48mph at 5400rpm
19 pitch Mercury Rev4 stock: 49mph at 5400rpm

Ken was with me for the cut run and not with me for the stock run so that MIGHT account for a couple tenths.

Ken from PropGods was there and provided the stock Rev4. Cruise, mpg, etc were all the same. Holeshot MIGHT have been a little better with the cut prop. Both hooked up extremely well in turns.

I think this prop would work very well on a boat that wants bow lift.

Ken also brought a 19 Mirage plus that we through on just for fine and it ran 49.5mph. My engine is pretty high and the Mirage plus would probably not work well offshore.

In a complete brain fart, I did not bring my Hydromotive QuadIV with.
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Old 12-27-2012, 06:30 PM
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was this on the fountain? id love to run that cut rev4 on my vantage but, it doesnt have a motor on it.
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Old 12-27-2012, 06:41 PM
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Yes, on the Fountain.
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Old 12-28-2012, 07:23 AM
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thank you. still debating if i'm going to go this route on a 36'yf - maybe on just the center prop to start. had cup added to my 23p Mirage Plus by Rich @ Leading Edge - brought counter down about 100rpm, center 300rpm and starboard 150rpm. The result was more bow lift because I could trim higher and still have bite. His next suggestion was to cut the bells and perhaps back cut some Rev4s - he does the props for Invincible this way. Stepped hulls run flat and getting the nose up helps efficiency/speed. YF has no flat pad like many or tunnel like INV - but getting that big nose up some helps.

I may be wasting time playing with props but always liked 4 blades better offshore - curious if you went down in pitch at all on the Rev4s? Since I added cup to the 23 Mirages, my thought is 23pitch Rev4s may be the answer - and can back cut if more RPM is needed. Thing is with new, bigger gear cases on Verados what worked best in the past on the 36'YF is a little different now.
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Old 12-28-2012, 08:38 AM
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Originally Posted by oldbrowndog View Post
thank you. still debating if i'm going to go this route on a 36'yf - maybe on just the center prop to start. had cup added to my 23p Mirage Plus by Rich @ Leading Edge - brought counter down about 100rpm, center 300rpm and starboard 150rpm. The result was more bow lift because I could trim higher and still have bite. His next suggestion was to cut the bells and perhaps back cut some Rev4s - he does the props for Invincible this way. Stepped hulls run flat and getting the nose up helps efficiency/speed. YF has no flat pad like many or tunnel like INV - but getting that big nose up some helps.

I may be wasting time playing with props but always liked 4 blades better offshore - curious if you went down in pitch at all on the Rev4s? Since I added cup to the 23 Mirages, my thought is 23pitch Rev4s may be the answer - and can back cut if more RPM is needed. Thing is with new, bigger gear cases on Verados what worked best in the past on the 36'YF is a little different now.
I think yellowfin is doing this tube cut. I know invincible is. Maybe propgods can chime in.
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Old 12-28-2012, 08:47 AM
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Invincible has Rich do the back cut on the blade to get more RPM.

I believe Yellowfin is cutting the tube down to get more bowlift.
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Old 12-28-2012, 11:14 AM
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Originally Posted by oldbrowndog View Post
thank you. still debating if i'm going to go this route on a 36'yf - maybe on just the center prop to start. had cup added to my 23p Mirage Plus by Rich @ Leading Edge - brought counter down about 100rpm, center 300rpm and starboard 150rpm. The result was more bow lift because I could trim higher and still have bite. His next suggestion was to cut the bells and perhaps back cut some Rev4s - he does the props for Invincible this way. Stepped hulls run flat and getting the nose up helps efficiency/speed. YF has no flat pad like many or tunnel like INV - but getting that big nose up some helps.

I may be wasting time playing with props but always liked 4 blades better offshore - curious if you went down in pitch at all on the Rev4s? Since I added cup to the 23 Mirages, my thought is 23pitch Rev4s may be the answer - and can back cut if more RPM is needed. Thing is with new, bigger gear cases on Verados what worked best in the past on the 36'YF is a little different now.
I had the same problem with the new lowers, I bought the 23 bravo fs's and have been happy with them. I believe the boat runs better with the new bravo's than trimmed rev 4's.
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Old 12-28-2012, 02:28 PM
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Originally Posted by land crab View Post
I had the same problem with the new lowers, I bought the 23 bravo fs's and have been happy with them. I believe the boat runs better with the new bravo's than trimmed rev 4's.
Really? One local guy didn't care for the bravo fs. You gain speed at cruise or top end? Stay hooked up better offshore? I bark the outsides more than I'd like. Trip verado 300? What rpm are you hitting and did you do anything to the center -were you spinning it faster? And are you quicker to plane? Pm or or post any info please.
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Old 12-28-2012, 03:35 PM
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Originally Posted by ken2 View Post
Invincible has Rich do the back cut on the blade to get more RPM.

I believe Yellowfin is cutting the tube down to get more bowlift.
not from the factory - perhaps if you specify. mine was shipped with 23 mirages1 year ago. they have some at the shop w/bells cut but they were labbed 23s - i think on older lowers tho or 21 pitch. i haven't found enough data/owners with new lowers who have played with props. interested in landcrab's data...

curious Ken if you've run many boats with the Bravo FS and what the results were like.
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Old 12-28-2012, 05:09 PM
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I might try a set of Rev4's with a tub cut. I currently run Tempest 19's pitched to 20's by Rich. They are great props. The only thing I don't like about them is in bigger seas they ventilate when running full tabs trimmed down.
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Old 12-28-2012, 05:10 PM
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Haven't ran any with the Bravo FS props.
A few ran the XS, which is the same prop, but with huge vent holes.
Ran good on some boats, not so good on others.
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Old 12-28-2012, 06:09 PM
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Originally Posted by ken2 View Post
Haven't ran any with the Bravo FS props.
A few ran the XS, which is the same prop, but with huge vent holes.
Ran good on some boats, not so good on others.
Did you go up in pitch vs the old prop as Merc suggests with the FS? Since I added cup to 23"Mirages to drop RPMs 100 on left, 300 on center and 150 on starboard, on the FS should I go with 24" on outside and 25" center? With no vent holes those seem huge to me...my props came with a mid size vent hole.
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Old 12-28-2012, 06:32 PM
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Depends on your rpm and speed, but I wouldn't go up in pitch, I'd stick with 23s most likely. Maybe a 24 in the center, but it will depend on load.
I'd be curious to see if they would actually run better then a rev 4.
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Old 12-28-2012, 06:38 PM
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How much barrel are they cutting off to see a noticable differnce in bow rise?? 1"??
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Old 12-28-2012, 06:43 PM
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and I was always told to go down one pitch when going from 3 blade to 4 blade.
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