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  1. #1
    Registered
    My Boats:
    1999 Checkmate Convincor 242
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    Feb 2011
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    Lexington, SC.
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    Checkmate 242 Convincor with Built 502

    I need help identifying what prop to use. Here are the specs of my motor, please offer any help you can. I currently have a 25P Quicksilver Mirage & I'm not getting the top speed I feel the boat is capable of, specs are as follows:

    502 Bored 40 over stroked to 540
    Dart Pro 1 Heads w/ ARP Studs
    Quick Fuel 1050 CFM Carb
    RPM Airgap Intake
    High Performance Rings & Rocker's
    SRP Flat top Pistons
    Bravo 1 Outdrive
    1.5 Gear
    9:1 Compression
    Estimated 650 hp
    Estimated 740 Torque

    I've been told several things, typically run a Mirage 29P or 30P, and one said a Bravo 1 28P or 30P 4 blade prop. Anybody got suggestions or recommendations?

    Thanks,
    Ken
    Last edited by Cockeyed; 02-17-2011 at 08:03 AM.

  2. #2
    Charter Member #94 Charter Member Gordo's Avatar
    My Boats:
    1999 Active Thunder 25' Factory 1 Race Edition
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    Oct 2000
    Location
    New Port Richey, FL
    Posts
    2,436
    I'm thinking you're pretty close to my setup, and a 28p Bravo 4-blade prop would be a good start?
    Abby-someone

  3. #3
    Registered
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    1999 Checkmate Convincor 242
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    Quote Originally Posted by Gordo View Post
    I'm thinking you're pretty close to my setup, and a 28p Bravo 4-blade prop would be a good start?
    Thanks, what kind of top end are you getting, and how many RPM's?

  4. #4
    Gold Member Gold Member Dave M's Avatar
    My Boats:
    2006 30 Superboat
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    Oct 2000
    Location
    LaPlata, MD, USA
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    4,536
    What RPM are you propping for? The builder should know that.

    What is your current speed and RPM.

  5. #5
    Charter Member #94 Charter Member Gordo's Avatar
    My Boats:
    1999 Active Thunder 25' Factory 1 Race Edition
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    Oct 2000
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    New Port Richey, FL
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    A lot of variables, (air/water temp, load, etc.) but 83mph @ (I think) 5200ish.
    Turning a Lab-finished 28-P Bravo IV blade
    Last edited by Gordo; 02-17-2011 at 10:17 AM.
    Abby-someone

  6. #6
    Registered
    My Boats:
    1999 Checkmate Convincor 242
    Join Date
    Feb 2011
    Location
    Lexington, SC.
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    Quote Originally Posted by Dave M View Post
    What RPM are you propping for? The builder should know that.

    What is your current speed and RPM.
    Well the motor hasn't been broken in fully, so I was told the RPM's would rise between 600-1000 when the motor finally settles, we got 5200 RPM at 64 MPH, but will get some RPM's after adjusting the timing better. Everything I've read shows that I should be getting 80-85 mph.

  7. #7
    Registered
    My Boats:
    1999 Checkmate Convincor 242
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    Feb 2011
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    Lexington, SC.
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    Quote Originally Posted by Gordo View Post
    A lot of variables, (air/water temp, load, etc.) but 83mph @ (I think) 5200ish.
    Turning a Lab-finished 28-P Bravo IV blade
    You're right, sounds like a similar set up as I think that's about where I want to be...Thanks!

  8. #8
    Gold Member Gold Member Dave M's Avatar
    My Boats:
    2006 30 Superboat
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    Oct 2000
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    LaPlata, MD, USA
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    Quote Originally Posted by Cockeyed View Post
    Well the motor hasn't been broken in fully, so I was told the RPM's would rise between 600-1000 when the motor finally settles, we got 5200 RPM at 64 MPH, but will get some RPM's after adjusting the timing better. Everything I've read shows that I should be getting 80-85 mph.
    Based on those numbers, your slip in 22%. Is you prop in decent condition? I'd try a Mirage+ or Bravo 1.

    My previous boat, 24 Superboat was turning a 28P bravo 1 @5000 RPMs with only 425 HP, 78 MPH.

  9. #9
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    My Boats:
    1998 Velocity 280
    Join Date
    Oct 2010
    Location
    Cheboygan, MI
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    658
    I have a 522 with just over 600hp in a Velocity 280 and with the the Bravo 4 blade 28p I run 82 at 5200 without any trim, the prop blows out. I have a 27p Hydro-Motive 4 blade cleaver that runs mid 80's at 6000. I talked to Mercury Racing and they recommended a labbed 5 blade 30p at 15" diameter.

  10. #10
    Registered
    My Boats:
    1999 Checkmate Convincor 242
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    Feb 2011
    Location
    Lexington, SC.
    Posts
    9
    Quote Originally Posted by Dave M View Post
    Based on those numbers, your slip in 22%. Is you prop in decent condition? I'd try a Mirage+ or Bravo 1.

    My previous boat, 24 Superboat was turning a 28P bravo 1 @5000 RPMs with only 425 HP, 78 MPH.
    Quote Originally Posted by ThisIsLivin View Post
    I have a 522 with just over 600hp in a Velocity 280 and with the the Bravo 4 blade 28p I run 82 at 5200 without any trim, the prop blows out. I have a 27p Hydro-Motive 4 blade cleaver that runs mid 80's at 6000. I talked to Mercury Racing and they recommended a labbed 5 blade 30p at 15" diameter.
    Thanks for the information guys. I'm tempted to contact BBlades & try there test program, I've seen some others post that they have had great results with them. But since the consensus is a 28P, I'm thinking about trying the 30P just to see what kind of results I can get & how well it can push it...

    Anybody have any experience with BBlades & tried there loaner/test program?


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