how do you convert cm. measurements to.......

Discussion in 'Racquets' started by tnkGod4tns, Nov 26, 2006.

  1. tnkGod4tns

    tnkGod4tns Rookie

    Joined:
    Feb 18, 2004
    Messages:
    270
    points headlight
     
    #1
  2. El Diablo

    El Diablo Hall of Fame

    Joined:
    Feb 19, 2004
    Messages:
    3,561
    one inch = 2.54 cm.: one point = 1/8 inch: Can you figure the rest out?
     
    #2
  3. Amone

    Amone Hall of Fame

    Joined:
    Dec 29, 2005
    Messages:
    1,864
    Location:
    Detroit Area, MI
    If a headlight balance is negative, and a head heavy one is positive, in points, then...

    cm=( ( length / 2 ) + ( pts / 8 ) ) * 2.54

    So, for instance, 8 pts head-light, on a standard length racquet:

    =( ( 27 / 2) + ( -8 / 8 ) ) * 2.54

    =( 13.5 + ( -1 ) ) * 2.54

    = 12.5 * 2.54

    = 31.75 cm

    That's not what you asked, though. I'll get you another, more proper formula in a minute...
     
    #3
  4. Amone

    Amone Hall of Fame

    Joined:
    Dec 29, 2005
    Messages:
    1,864
    Location:
    Detroit Area, MI
    Okay, got it. It's not much jump from the first to the second. This time around, it's

    pts = ( ( cm / 2.54 ) - ( length / 2 ) ) * 8

    Using the same racquet, with the 31.75 cm balance:

    = ( ( 31.75 / 2.54 ) - (27 / 2 ) ) * 8

    = ( 12.5 - 13.5 ) * 8

    = -1 * 8

    = -8 OR 8 pts HL
     
    #4
  5. mileslong

    mileslong Professional

    Joined:
    May 18, 2004
    Messages:
    1,396
    Location:
    newport beach, california
    would an easier way to figure this out be to measure the length of the racket, find the exact middle point from one end then balance the racket. then find wherever the actualy balance point is you measure that distance from the balance point to the actual center and that tells you the pts headlight or headheavy?

    for instance, if a racket was 27" then the exact middle would be 13 1/2 inches. then you balanced this racket and the balance point was 1/2 inch from the center towards the handle, would that make the balance of this racket 4 points headlight?
     
    Last edited: Nov 26, 2006
    #5
  6. Amone

    Amone Hall of Fame

    Joined:
    Dec 29, 2005
    Messages:
    1,864
    Location:
    Detroit Area, MI
    Unless the action is less complex than the explaination, then no. Besides, I figure he's working with printed specs, so I gave him some things to work with numbers on. *shrug*
     
    #6
  7. Duzza

    Duzza Legend

    Joined:
    Nov 1, 2005
    Messages:
    6,315
    Location:
    Melbourne, VIC, Australia
    Amone, I know you are into this racquet maths stuff but.....
    You do it like this:

    ((Balance point/2.54)-(length/2))*8

    but can't you do....

    (((length/2)-balance point)/2.54)*8?

    So say the Balance point was 31 and length was 70...using your way:

    ((31-35)/2.54)*8= -12.6

    My way:

    ((35-31)/2.54)*8= 12.6

    Just rids the negative....
     
    #7
  8. anirut

    anirut Legend

    Joined:
    Feb 26, 2005
    Messages:
    5,093
    Location:
    Krungthep (Bangkok), Siam (Thailand)
    Duzza, the negative is there to say it is HL. You method will make HL's to positive and HH to negative.

    I "THINK" that negative value is the generally accepted value for HL.
     
    #8
  9. Duzza

    Duzza Legend

    Joined:
    Nov 1, 2005
    Messages:
    6,315
    Location:
    Melbourne, VIC, Australia
    Oh of course! LOL. Well I just know that it's not going to be HH so I don't bother. I mean in maths you've got to know what you are expecting :D.
     
    #9
  10. anirut

    anirut Legend

    Joined:
    Feb 26, 2005
    Messages:
    5,093
    Location:
    Krungthep (Bangkok), Siam (Thailand)
    Ever heard of "negative acceleration"? ;)
     
    #10
  11. Duzza

    Duzza Legend

    Joined:
    Nov 1, 2005
    Messages:
    6,315
    Location:
    Melbourne, VIC, Australia
    Well to be honest no. If it has anything to do with Physics, I quit Physics first semester LOL.
     
    #11

Share This Page