2500 Specific impact peak force (N.dm 3 /kg) 2000 1500 1000 500 0 S13/G2 G2/J3/G2 G2/F3/G2 G2/B S2 S3 Figure 4.27 Specific impact peak force between G2/B3/G2, G2/J3/G2 and G2/F3/G2 138