before bottom center

before bottom center

Beaufort scale.

Position of the piston in the cylinder at before bottom center position. When the piston reaches bottom dead center, the position and the crank throw are in line.

The position of the piston in the cylinder of a reciprocating engine as the piston is moving downward, just before the bottom of its stroke, with the crankshaft turning in the direction of normal rotation.

An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved