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Airfoil structure for enhancing aerodynamic performance for use in e.g. aircraft design, in light helicopters in i.e. main rotor blades, has air outlet positioned at quarter chord point, and duct provided with inner walls that are angled to direct airflow along channel between air inlet and outlet 2024-12-10
Pedal-operated airtight magnetic rubbish bin for protecting e.g. insects, from e.g. domestic waste, has push bar vertically provided at one side of container, and electromagnetic flap pivoted to container and adapted to close/open container 2023-03-08