A radio controlled vehicle have greater than two gyroscopic action wheels provides a wider range of stunt options and increased stability during operation. This is done by assigning a corresponding priority level to each slave device, wherein at least two slave devices are assigned different corresponding priority levels. The vacuum panel portion comprises an initiator portion and a control portion, with at least a portion of the control portion being more steeply inclined relative to the longitudinal axis than at least a portion of the initiator portion. A light receiver receives light emitted by the metal mass heated in the melting pot and develops a received-light representative signal.