Steam ball (Hot Air Balloon) be lighter than air, on half are shape of a big balloon, issue half aircraft that is nacelle. (the picture comes from Oriental IC)The interior of the balloon heats air, have lower density with outside cold air relatively so, will make whole produces displacement as buoyancy; Nacelle can carry passenger and heat source (it is bright fire mostly) . Modern campaign balloon is made by nylon fabric normally, mouth place is made with fireproof material. (the picture comes from Oriental IC)Motivation | | | The exclusive flight motivation of steam ball is wind. To the hot balloon of round-the-world flight, must choose the headroom air current with speed and right way, move subsequently, ability completes a flight efficiently. Like keeping changing a plane just like the need when making round-the-world trip, steam ball needs to take different breath, "Take a breath flows " when adjust height what air man place should make namely, the height of steam ball should achieve ten meters normally. (the picture comes from Oriental IC)Safe | | | If the helium in the flight enrages occurrence leak, steam ball will become rely on completely heat maintain altitude; If leak is increased, irretentive height, the balloon will have the effect of parachute, drop speed control is in every second 5 meters in; If the state continues to worsen, flier still has enough time parachute; The thing that is a rescuer later. (the picture comes from Oriental IC)