centreboard

n.

（帆船的）活动船板，中插板；

ROTABLE AXIS TO WHICH THE MAST, CENTREBOARD, WINCHES ARE CONNECTED
Mathematical Analysis of Centreboard Hopper Parts Feeder
LIFT AND DRAG COEFFICIENT ANALISYS IN A FOILING CENTREBOARD OF A MOTH WITH FLAP'S ANGLE OPTIMIZATION
Swinging Centreboard for vessels
STUDY ON THE MAST SOCKET AND CENTREBOARD LOCATION HOLE OF AN 8 FEET FRP YACHT
Effects of Surface Finish on Areodynamic Performance of a Sailboat Centerboard
Centerboard snubber
Hydrodynamic appendage such as a keel or a centerboard, and a method of fabrication
19th Century Workhorses: The Examination of a Centerboard Schooner off Dog Island, Florida.
Filter cartridge with centerboard, dust collectors, and methods