Though I've never tried releasing anything from an R/C airplane, I did use "live" payload several times on my rockets.

Did you know that geckos could probably fly to the moon! They would make excellent astronauts, and their family doesn't care if things just don't work out during the mission.

Next: Could my Cocker Spaniel sustain 9 G's on my R/C F-16?
Actual cockpit footage coming soon.