proper prop
11-29-2006, 07:16 PM
#1
Registered
Thread Starter
proper prop
have a 1995 419 formula with trip 500s currently have 3 blade mirage plus that are a 25p turning about 4600 rpm at top end around 70mph cruises at 3100 rpm at 48 mph. Seems like there should be higher rpm at top end any suggestions. Thanks Mark
Got to be a better set up
Got to be a better set up
11-30-2006, 08:20 AM
#2
Registered
Re: proper prop
HEllo Mark,
Can you tell me your gear ratio please? I used 1.5 for a ratio and come up with 4% slip which is not possible on a vee bottom boat. I very well may have your gear ratio incorrect. If you indeed have 1.5 gears then we need to look at verifying your recording devises. Let me know.
Julie
Can you tell me your gear ratio please? I used 1.5 for a ratio and come up with 4% slip which is not possible on a vee bottom boat. I very well may have your gear ratio incorrect. If you indeed have 1.5 gears then we need to look at verifying your recording devises. Let me know.
Julie
11-30-2006, 02:16 PM
#4
Offshoreonly Advertiser
Offshoreonly Advertiser
Re: proper prop
Hello,
Even with a 1:36.1 ratio you would be running very well for that boat. Between 11-13% slip depending on the rpm's.
Your R's are low for 500's. We would like to see you at at least 5000 WOT. Labbing the props will help your top end and save the motors, but won't help the cruise speeds.
What is the ultimate goal? Top end?
Even with a 1:36.1 ratio you would be running very well for that boat. Between 11-13% slip depending on the rpm's.
Your R's are low for 500's. We would like to see you at at least 5000 WOT. Labbing the props will help your top end and save the motors, but won't help the cruise speeds.
What is the ultimate goal? Top end?
__________________
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Last edited by bbladesprops; 12-06-2006 at 05:49 PM.
11-30-2006, 04:23 PM
#5
Registered
Thread Starter
Re: proper prop
Keep cruise where it is and find the rpm on top. I figured 5000rpm also. thought about labbing but didnt know if what I had was right to begin with. Not sure what the gears are will find out. Thanks Mark
12-01-2006, 03:45 PM
#6
Registered
Thread Starter
Re: proper prop
Originally Posted by throttleup
HEllo Mark,
Can you tell me your gear ratio please? I used 1.5 for a ratio and come up with 4% slip which is not possible on a vee bottom boat. I very well may have your gear ratio incorrect. If you indeed have 1.5 gears then we need to look at verifying your recording devises. Let me know.
Julie
Can you tell me your gear ratio please? I used 1.5 for a ratio and come up with 4% slip which is not possible on a vee bottom boat. I very well may have your gear ratio incorrect. If you indeed have 1.5 gears then we need to look at verifying your recording devises. Let me know.
Julie
12-06-2006, 05:52 PM
#7
Offshoreonly Advertiser
Offshoreonly Advertiser
Re: proper prop
Make sure the tach is reading correct and the the speed reading is accurate too. Your slip % does seem low.
Labbing the props you have sounds like a good option at this point.
Labbing the props you have sounds like a good option at this point.
__________________
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
