My old R/C X-1 Rocket Boosted Glider used water ballast in the nose, to counterbalance the propellant mass of a G12 reload in the tail as it burned away. Rigged to begin draining the water at liftoff, empty 2-3 seconds after burnout. Otherwise, it would have been dangerously tail-heavy at liftoff, or dangerously nose-heavy for glide.

Anyway..... after one of the flights of the X-1, Chad Ring came over and told me that he felt drops of ballast water from the X-1 hit him (like raindrops). Wasn't complaining, he felt "special".



More info: http://georgesrockets.com/GRP/Scale/X1.htm

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