• Welcome to the Checkmate Community Forums forums.

    You are currently viewing our boards as a guest which gives you limited access to view most discussions, articles and access to our other FREE features.
    By joining our free community you will be able to:

    » Interact with over 10,000 Checkmate Fanatics from around the world!
    » Post topics and messages
    » Post and view photos
    » Communicate privately with other members
    » Access our extensive gallery of old Checkmate brochures located in our Media Gallery
    » Browse the various pictures in our Checkmate photo gallery

    Registration is fast, simple and absolutely free so please, join our community today!

    If you have any problems with the registration process or your account login, please contact support by clicking here or by using the"contact us" link at the bottom of the page.

Prop slip question

ckmate225

ckmate225

Active member
So,If I Input all my data into a prop calculator I am showing 9.8% slip, Does that sound a little high?
No jack plate and I am running a little deep with the L.U. Until I get one.
I am running a 23p lazer II on my Pulse 186/merc 2.4

63mph
6000rpm
1.87 GR
23p
=9.8% slip

So By raising the motor I should decrease the drag which should lower the % of prop slip and should increase the overall performance of the boat. Correct?
Also,Someone mentioned the LaserII is a deep water prop and if I raise it I will lose my bowlift. I have not read that anywhere has anyone?
 
I'm not real sure about how much slip is good, I never figured it out before now, but I entered my #'s in a prop calculator on sunday
67mph
6100rpm
1.87GR
24p
= 10% slip

That was with the trophy plus on one run- I never had a chance to do a second one or try the 25p laser 2 because the motor started acting up- found out I need a throttle position sensor, I can tell you that from the little I ran the laser last year it would lose bow lift if the motor was a little too high and it seemed to like to run deep, but not too deep or it will chine walk.

I know your tired of hearing this:devil: but you need a jackplate, then you can raise it and keep your bow lift with the setback. this is just a guess but I would think your boat would hold bow lift better than mine because of the closed bow?
 
Hey John,
A jackplate is definitly in the future, I am just trying to figure out if I am getting the right numbers out of what I have and see what other guys are getting for slip %.
Whether or not I should be at 10% -7%- 5% or ??. I am mostly just curious and I like to have some backround knowledge so it seems like I know what I am talking about when I pull up to the beach and the BS starts to fly.
:):).
 
ckmate225 said:
Hey John,
A jackplate is definitly in the future, I am just trying to figure out if I am getting the right numbers out of what I have and see what other guys are getting for slip %.
Whether or not I should be at 10% -7%- 5% or ??. I am mostly just curious and I like to have some backround knowledge so it seems like I know what I am talking about when I pull up to the beach and the BS starts to fly.
:):).
Click to expand...

I know, I was just busting your balls about the jp, I'm curious about the slip numbers also, I have no clue what they should be so hopfully someone will chime in with a idea, to be honest I never even thought about it before reading about it a few months ago somewhere on here

I just ran the numbers from what I was getting last year with the 25p laser 2, my memory might me a little foggy because it was 7-8 months ago but here it is.

71mph
5900rpm
1.87GR
25p laser 2
=5%

I feel like thats a big difference between the two props, both of those were for one run only and I'm not really sure where my prop shaft was, I need some more seat time and hopfully I will get the boat back soon so I can do some more testing.
I still have the 23 and 25p tempest plus, 25p trophy plus and 23p laser2 to try, and also the 25p laser 2 to try again
I'd like to figure it out so I can pick one and give my dealer all his props back :D

Are you still running the motor that was submerged or is that a different one :poke:
 
0% slip is Ideal and also unattainable. The closer you can get to 0% the better. Im gonna say that 10% for your boats is pretty good. Smaller lighter boats can see slip numbers of only 5-6%
 
Thats the powerhead that went under:shakehead:, But I had the thing rebuilt & balanced.the tuner is from the 225 as well as the lower. The mid is a newer 3 piston trim system and I worked the cowl to fit the 2.4. So its pretty much 2 motors I have piled together to make it run well and look pretty:D.

Did I mention that I am gonna get a jackplate soon?

But back to the prop slip thing...
You are gonna have to post a database for all the props you run so those of us with out the option of testing can take advantage of all your"work".
:bigthumb:
 
10% on a Convincor is real good anything under that your superman. Anything over that homework is needed.
 
I was getting 7% in my predictor and am seeing 12% in my starflite. EVERY boat/setup will be different.

Keep in mind that all props are different as well. Props from different mfg will have more or less slip than others.

When you are running the prop lower in the water, you tend to get less slip. Once you start adding a J/P and lifting it up, you tend to get more slip when approaching the surface. Thus allowing for a larger prop diameter. :thumb:

ILL
 
Sounds like 10% is decent then

BTW, on the 67mph run my speedometer was crowding 75mph, I think I'll start leaving the gps at home and go by that ;)
 
I always say 10% is a good guess. You can work out the exact numbers if you have a GPS and good tach. In most cases my Pulsare is around 9% depending on prop. Many things effect slip
 
You must log in or register to reply here.
Back
Top