The present invention relates to a forage harvester blower including a blower rotor having a plurality of generally radially extending rotor paddles which operate in a corresponding substantially cylindrical housing, characterised in that said housing is provided with adjustment mechanism for at least locally adjusting the diameter of the housing. The method also includes automatically switching off, when one or more GPUs is in an idle state during the window of time, power to the one or more GPUs to transition the one or more GPUs into a quiescent state of zero power utilization thereof. For example, the state data may define a currently available size; each piece of content has associated size properties that can be matched in the selection process. The configurations operate different sets of winding coils when operating in different directions. In the scram jet engine of the present invention, fuel may be used as a coolant and supplied to the cooling passage. A moisture-proof agent is applied on the adhered sheet, a center hole for a voice coil and periphery are removed to make a speaker diaphragm having a predetermined dimension and shape.