He turned his head briefly to regard the new change in her voice. He couldn't spend too much attention on her and his eyes fixed right back on the kite. "Just a gas really. Preferably acetylene if it's obtainable. Since it's timed, it needs a relay to keep the pulse going until the clouds clear. They have to be exact to prevent retraction which isn't something I want. Once the clouds clear, the cannons can stop so it's not an all day thing...I hope."

Lee wasn't sure how thick the clouds were and it would be a while before he could have a good range of thickness. Sadly, there was no full proof method other than building a hand glider or a plane to test it.