This web document has the most in depth math/physics analysis of
ABSOLUTELY EVERYTHING relating to soccer!!
"The Science of Soccer" by John Wesson:
=>
http://www.scribd.com/doc/6726997/ScienceofSoccer
Their analysis of kick, bounce and spin are useful, and worth reviewing briefly.
Some items covered include:
1) Professional kicks go 70+ miles per hour & contact with foot lasts ONLY 1/100 of a second
2) ball spin of around 10 RPS can accelerate a ball on landing by 5-10 miles per hour
Team 3135 will use a 3-4lb pendulum mass traveling at ~25-30 MPH at impact with the ball for a max contact distance of 3-5" to have it travel the length of the field, clearing both bumps at low "line drive" angle. Our bungee winder design can shoot at any point during the 2-3 sec (to full power) wind up, and also have programmed level of wind up to adjust kick strength.
We also will need to quickly (<1" travel) absorb the momentum impact of this kicker's momentum using synthetic cord tether.
-- Dick Ledford