Abstract: A helicopter (1) has a horizontal rotor (2) driven for rotation about a vertical rotor axis (4), and a tail (9) extending backwards from the rotor axis (4) at a fixed angle (10) between about 20° and about 60° to a vertical longitudinal middle plane (7) of the helicopter (1) on a retreating blade side of the horizontal rotor (2). The tail (9) comprises a profiled body (16) including aerodynamic effective surfaces (19, 20) for selectively generating lift on the retreating blade side of the horizontal rotor (2) in forward flight of the helicopter (1). For hovering flight of the helicopter (1), the profiled body (16) can be swiveled about a swivel axis running parallelly to the main axis (21) of the tail for reducing a cross-sectional area of the profiled body facing the horizontal rotor (2).

Abstract: An infusion system delivers drug to the patient at a fixed rate while permitting the patient to introduce a controlled bolus dosage when needed. A pump having a bulkhead that is provided with first and second flow paths from the pump reservoir to a single outlet port. The first flow path communicates with a first flow regulator which restricts flow in the first flow path to the desired fixed rate of delivery. The second flow path communicates with a patient-operated pump incorporated into the pump housing. The patient-operated pump may be in the form of a deformable reservoir that accumulates a drug bolus which may be expelled when the reservoir is compressed by the patient's fingers. A second flow regulator may be incorporated in the drug flow path upstream of the patient-operated pumping device to restrict the dosage that may accumulate therein. Additionally, a fluid control assembly incorporating a patient-controlled pump may be used with single or dual port pumps.