TW Professor: Spin window variance between two similar frames?

Discussion in 'TW Questions/Comments' started by Murrayalmagrofan, Sep 13, 2012.

  1. Murrayalmagrofan

    Murrayalmagrofan Semi-Pro

    Joined:
    Feb 5, 2012
    Messages:
    405
    Location:
    Virginia
    I'm considering switching from my Slazenger Pro Braided 95 to a racquet with a 90 square in headsize, so "spin window" is a critical piece of data I'm using in my search for suitable frames to demo.

    At the top of my list currently is the Wilson BLX Pro Staff Six.One 90 which has a spin window of 5.71 inches. The previous generation of this racquet, the Wilson BLX Six.One Tour, has almost identical specs (beam width, string pattern, stiffness, etc) but has a spin window of just 5.29 inches.

    From my research, "spin window" is calculated based on the following:

    racquet beam width opposite hitting location
    stringbed width at hitting location
    ball speed in
    ball angle in
    ball spin in
    racquet impact location speed
    racquet swing angle
    racquet tilt
    impact angle (a composite of above angles and speed)
    exit angle (depends on friction between strings and ball)
    how far the ball will slide on the strings

    So why are these two nearly identical frames have almost a 1/2" difference in their spin windows?
     
    #1
  2. TW Professor

    TW Professor Administrator

    Joined:
    Apr 21, 2008
    Messages:
    806
    The measurements of stringbed width were greater by about 1 cm or a little more at each location for the BLX Pro Staff Six.One 90.
     
    #2
  3. Murrayalmagrofan

    Murrayalmagrofan Semi-Pro

    Joined:
    Feb 5, 2012
    Messages:
    405
    Location:
    Virginia
    Many thanks! I never realized there was a physical difference between the two frames.
     
    #3

Share This Page