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SkyTrak distances are short

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  • SkyTrak distances are short

    I have read about this issue here but I don't see a cause or resolution.

    All of a sudden I am about 25-35 yards short on every club. Nothing at all has changed that could possibly account for this. The unit has 0 degrees of tilt and roll.


    Any suggestions?


    Thanks
    Last edited by Marcus Schantz; 10-03-2019, 08:14 PM.

  • #16
    968Cab,

    My side by side comparison ended up with similar results with the exception of driver. Noticeable ball speed discrepancies begin to show up around 150mph. I play a 17 degree fairway wood (4 wood) that I max out around 148 and it reads this club accurately. I have no issues with my entire bag until I get to my driver. My average ball speed with my driver with a controlled aggressive swing is in the mid to high 150s, occasionally hitting one on the screws that will go over 160. The highest I’ve ever been able to get the SkyTrak to read is 156 and that was a swing out of my shoes and hit it on the screws swing.

    In your testing you used an 8 iron and your average ball speed was around 100mph. Based off of this I suspect your driver ball speed would be about 140 which keeps you below the 150 threshold and you shouldn’t have any problem with shortages throughout your whole bag.

    I have a CCE and a FB strip and I’m still searching for something that replicates my real course turf...

    Comment


    • #17
      I have a CCE and a FB strip and I’m still searching for something that replicates my real course turf...
      Sorry to take the thread somewhat OT, but I think this addresses some of the issues for the OP.

      I am a tinkerer. I might just play around with this. Here are the issues with mats as I understand it:

      1. For mats that don't give, tendonitis.
      2. For mats that let the club head bounce into the ball, false feedback. You think you are hitting it well, but in reality, fat.
      3. For mats that "grab", twisting of the club face, resulting in excessive HLA and spin axis.
      4. For all mats to a degree, not enough friction between ball and turf, leading to ball rolling up face resulting in higher launch, lower spin. Which leads to sim differential to real life carry.

      FB seems to take care of 1 to 3, and do a better job than most on 4. Can this be improved upon? Can we combine the best aspects of other mats? Use stiffer bristles, but backed by a flexible membrane (divot action style), and perhaps even the movable sliding action of fairway pro? Or can the friction be increased some other way?

      I would love to see impact at 2000 FPS slow motion from real turf and every type of mat.
      Last edited by Morini; 10-06-2019, 01:56 AM.

      Comment


      • cmckelvmi
        cmckelvmi commented
        Editing a comment
        If you could create this mat that has the best of all worlds I would be one of your first customers.

      • jrz
        jrz commented
        Editing a comment
        Well said.

    • #18
      Morini - If I was to take a stab at this and had the materials to build it, I would try the following to combine the best of all worlds:

      Stiffer bristles or more bristle density, shorter bristles (around 1/2 inch), very hard rubber with minimal give beneath the bristles, and about a 2 inch divot slide (spring loaded) for divot action.

      If mats produce less spin and a higher launch, I'm guessing its because ball contact and the subsequent compression is occurring too high on the face making the smash factor for irons creep closer to 1.5 than it should be. I've actually never looked at mat vs. real turf smash factor differences with the same club. I'd be curious to see what these numbers look like.

      Comment


    • #19
      Morini Am I reading the data in the trackman link correctly? It seems to show that the higher launch angle along with less spin is leading to longer carries, which is opposite of what most report in regards to sim differential to real life carry.

      Comment


      • #20
        Originally posted by jrz View Post
        Morini Am I reading the data in the trackman link correctly? It seems to show that the higher launch angle along with less spin is leading to longer carries, which is opposite of what most report in regards to sim differential to real life carry.
        I could be wrong on this, but I think it depends on club. While it may launch higher, the lower spin offsets by lowering actual trajectory. I will play around with flightscope trajectory optimizer. What I am trying to wrap my head around is how and why tee'd shot spins more than turf. By that logic, maybe the answer to recreating fairway ball characteristics is to tee the ball up a fraction?

        Comment


        • #21
          Originally posted by Morini View Post

          I could be wrong on this, but I think it depends on club. While it may launch higher, the lower spin offsets by lowering actual trajectory. I will play around with flightscope trajectory optimizer. What I am trying to wrap my head around is how and why tee'd shot spins more than turf. By that logic, maybe the answer to recreating fairway ball characteristics is to tee the ball up a fraction?
          Could it be that the turf's friction dampens the amount of force applied to the ball by the club? In other words, the clubface makes contact with the ball, the friction between the clubface and ball causes the ball to spin. At the same time, if the ball is sitting on turf, the friction of the turf fights back against the force being applied by the club, therefore reducing the amount of spin. When the ball is on a tee there is no fighting back, and as a result more of the club's energy is transferred into spin.

          Comment


          • Wizard of Coz
            Wizard of Coz commented
            Editing a comment
            I want a live match with you jrz. Calling you out bruh. Wizard gonna make you 4putt the eighteenth hole to lose! Can you handle Wizard's pressure cooker?

        • #22
          I think ball/mat friction can be ignored. The friction force is miniscule compared to the club impact force.

          Those tests have a lot of uncontrolled variables. I wouldn't conclude too much from them.

          Comment


          • #23
            think ball/mat friction can be ignored. The friction force is miniscule compared to the club impact force.
            They are not competing forces. When you take an icy corner too fast in your muscle car, a handful of sand on the surface goes a long way.

            Those studies are not perfect, but there is ample supporting anecdotal evidence indicating that mats launch higher with less spin.

            The challenge is to first of all understand the physics behind this, and then try to improve mats to better match on course ball behaviour for the gamut of swing styles.
            Last edited by Morini; 10-12-2019, 11:43 PM.

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