The control of twisting somersaults

An object oriented implementation of the Yeadon human inertia model

“…This issue is not addressed in 10, 12– 14 , and our implementation disagrees with the ISEG code found in 11 (see page 358 line 251). The justification for our choice is to agree with a more recent version of Yeadon’s code, provided to us in a personal communication.…”

“…This choice is informed by calculations present in the ISEG code published in 11 . Joint center locations in all other segments are at the center of the last stadium in the preceding segment.…”

“…This is in accordance with Figure 1 of 13 . However, this is a departure from 11 , in which the joint center of the chest-head is placed at the midpoint of the shoulder joint centers.…”

“…Yeadon himself developed a Fortran program called ISEG in his doctoral work 11 , to efficiently compute the inertial parameters. The original source code is available in his dissertation but is not adaptable for inclusion in modern software packages, is not copyrighted under a liberal reuse license (i.e., Creative Commons Attribution-NonCommercial-NoDerivs 2.5), and is not very user friendly.…”

Twist limits for late twisting double somersaults on trampoline

“…It is understandable that no solution existed with the arms adducted by less than 4 o since there is little margin for variation (Table 1) in the limiting movement. In any performance of a given movement there will be variability in execution which may be compensated for later in flight by making adjustments in configuration using feedback control (Yeadon and Hiley, 2014). As there is little margin for making such adjustments it is likely that this limiting movement lies just outside the set of achievable movements.…”