from Physics World

Liquid droplets or soft solid objects can be catapulted with more than twice the energy of rigid projectiles, according to physicists in France. They say that this “super propulsion” relies on additional momentum provided by the stretching and compression of deformation and could have practical applications in areas ranging from ballistics to bioengineering.

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...Celestini also believes the work could have military applications. He reckons that the results might lead to “a new efficient catapult for launching aircraft”, but says he cannot provide details on such a system for the moment.

I plasma rifle would be a cool application of this knowledge.  A barrel lined with the super hyrdrophobic material and a shotgun wadding type plunger to throw the plasma out at high velocity could provide a useful weapon against certain armor types.