theory of piston skirt hydrodynamic lubrication

forced lubrication [= pressure lubrication]

3D skirt model

accordion pleated skirt

after skirt

Al piston skirt

A-line skirt

all-around pleated skirt

Aluminum Piston Skirt

Aluminum Skirt

anklet skirt

Anti-polluting-flash assistant umbrella skirt

apron-skirt

Arabian skirt

back pleated skirt

ballerina skirt

balloon skirt

bare-shouldered gown in white lace encircling bodice and rayon sheer skirt

barrel skirt