Abstract: The wing flapping mechanism (100) includes a main frame (110), a pair of opposite wings (120) laterally projecting from the main frame (110), and a linkage arrangement to convert rotation of a motor (150) into a three-dimensional cyclic wing motion of each of the wings (120). The linkage arrangement includes torque-transmitting couplings extending from inside the main frame (110) into the wing structures (122) to transmit an alternating pivoting motion, created as a result of the rotation of the motor (150), to the distal end of a corresponding third torsion-responsive tube (140, 144??). Each torque-transmitting coupling extends inside a shoulder joint (130), a first torsion-responsive tube (132, 144?), an elbow joint (134), a second torsion-responsive tube (136, 144?), a wrist joint (138) and the third torsion-responsive tube (140, 144??) of the corresponding wing structure (122).

Abstract: The diffuser can be used at an end of a vehicle exhaust system. The diffuser can have a generally hollow body with an inlet for receiving exhaust gasses from a substantially vertically-extending component of the vehicle exhaust system, and a substantially flat outlet grate through which the exhaust gasses are to be released to the atmosphere, the outlet grate being configured and adapted for use in a roof of the vehicle, in an aligned position therewith, with the hollow body of the diffuser positioned inside the vehicle and below the outlet grate.

Abstract: The diesel engine vehicle has a passenger area, and a substantially vertically oriented ventilated chamber separate from the passenger area. The ventilated chamber can be in air flow communication with an engine compartment to evacuate heat therefrom. A heat-emitting exhaust treatment unit can be housed in the ventilated chamber and connected between the diesel engine and an exhaust outlet in an exhaust system of the vehicle.