L:J HINTS ABOUT "TAKE OFF"-S Much has been written about the techniques of different vaults, but little emphasis was given to improve tak e-off techniques (especially at girls) _ We must realize that after a gy mnast left the " take-off board", actually little can be done durin g the fli ght to shape the appearance of the vault ; the fate of the fli ght will be decid ed at the moment of the " take-o ff " when all the powers, leading to the vault, will be generated and aim ed_ Nothing is more important in thi s respect th an understanding and trainin g a correct take-off_ The illustration, drawn here, shows the problem and the comp onent s. In order to avoid lengthy and too theoretical , let me explain in practical lan guage what you see here_. In order to va ult, you need a runn ing approach. This will give yo u forw. speed (Sp 1). To change ,the forw. motion of this speed into a high and expl osive fli ght ( b 1) vou will have to boun ce off at an appropriate place. This "bounce-off" requires very serious considerations in order to select the appropri ate angle for the vault (beta) and to in crease the after-contact speed ( b) instead of losing it by the contact. We face certain non -adjustable fa ctors, such as the springiness of the board (PT ), the distance of the board from the apparatus (it must be predetermined depending on technical requi rements of the vault_ Althou gh the distance is optional with the gymnasts_ still there is a mechanically precise distance which must be met for best result s), the height an d length of the apparatus and also the weight of the athlete itself (G). The other fa ctors can be adjusted by the gymnast itself. Th e take-off an gle (beta ) will be determined by the incoming an gle (alpha ) and by the powers and the speed of the incomin g obj ect
by "Jim" Farkas , Instructor 0/ Physical Education, 0/ The Milwaukee Turners, Wisconsin
:~ (a ) . The take-off speed and power will be th e consequence of the combined powers of the hum an body and the liftin g capacity of the board (AT and PT ) in addition to the infl uence of the " delay" or travel" signifi ed by (gamm a) - totaling alpha and beta. In order to decrease ( beta), one must in crease (alpha) at the sam e Sp 2 (fli ght speed ). This must be done in case one wants to increase the height of his vault. To in crease " b" powers, one mu st increase the powers of "a" by increasing " LJ" (the length of preparatory jump) and also "Sp 2" (the speed of the preparatory jump) . The LJ will gradually grow with "epsilon" (angle of elevation) increasing up to about 45°; aft er that it will be gradually shorter ( this can be significant at other than Reuther type of boards ). With the increase of LJ, however, the Sp will gradually decrease; so, in order to assure an appropriate high takeoff speed, Sp 1 must be proportionatly increased. Actually here two " power-fountains" (a horizontal and a vertical) , acting in a right angle, must be r elated so that the resulting merger will give us the desired direction and power, to complete a task assigned by the technical requirements of a particular vault.