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I took some clips from the Holm vs. Thomas sport science documentary and coupled with recent research by Earp in the Journal of Strength and Conditioning research (2011) made this short video showing how the length of the Achilles Tendon influences knee bend and ground contact times in single leg jumping.
Typically, athletes with shorter Achilles tendons will be better at jumps from a running start, relatively speaking, but their standing verticals will be poor compared to their long tendoned counterparts.
Athletes with longer Achilles tendons will excel and standing and short approach jumps, but will be at a slight disadvantage when it comes to fast running jumps. This doesn't mean that they can't be good at it, however, they will just end up doing it with slightly different Biomechanics.
In short: Long Achilles tendons = better standing vertical jumps, and more knee bend on running jumps to jump high. Longer contact times. Short Achilles tendons = better running jumps, particularly off of one leg.
Relevant research: Earp, J. E., R. U. Newton, P. Cormie, and Kraemer J. W. "The Influence of Muscle-Tendon Unit Structure on Rate of Force Development, During the Squat, Countermovement, and Depth Drop Jumps." Journal of Strength and Conditioning Research 25 (2011). Web.
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