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Title: does not work
Review: We got this for our son's 7th birthday and tried to fly the rocket - put in a new set of batteries, made the citric solution, set the rocket, the bubble comes up from the bottom of container, and the launch beep comes. We stretch the launch code tout and push button after we make sure that we are not close to the launch system... Nothing happens. We repeated again and again over this process carefully re-reading the instruction, making sure that the filament is not wet, but we never got this thing to fly. I believe the bubble that comes out of the liquid is hydrogen (and oxygen), but the filament is never able to ignite it - either the filament temperature is too low or the hydrogen concentration is never high enough. After a several days of fruitless tries, it simply went into the garbage box. Waste of money and time!
