A hot air balloon rises and maintains height, generating lift because of heated air that is frequently re-heated within a bag called the envelope, whilst suspended beneath the envelope there is a wicker basket and about two metres above is the source of heat, using an open gas flame to force hot air deep inside the balloon. The heated air inside the envelope makes it buoyant since it has a lower density than the relatively cold air outside the envelope. RAKE has a unique hot air balloon that defies the laws of physics, and stays aloft for three days without ever turning on the two gas flames to force hot air deep inside the envelope.