| 摘要 |
A structure used to raise persons by means of air jets (currents), which is utilised in funfairs or the like, includes several flight positions ( 3 ). Each flight position is associated with a device ( 1 ) that generates a vertical air flow, whose flow rate and intensity are constantly monitored from a control room ( 9 ) provided with an alphanumeric display. The device ( 1 ) includes a variable pitch propeller ( 6 ) driven by an electric motor whose rpm is adjusted using an inverter. An electric signal from a balance ( 7 ) is processed in order to determine what frequency should the motor supply current have to raise a participant of this weight up to a maximum height which is preferably about 2.5 to 3 meters.
|
