It's an amazing feeling when your creation first gets lift and starts to take off.
At this stage, there's about ten thousand things that could go wrong. Carefully think everything through before you actually do it.
I tied some thread to mine so I could fly it inside our warehouse without it getting away and setting the place on fire.
It will drip a lot of hot wax, so keep it over the cardboard if possible. Also, if you let the candles burn all the way down, the balsa will catch on fire. I am currently experimenting with other types of candles to prevent this.