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Corer piston off the stern.

Corer piston off the stern.
Corer piston off the stern.
Corer piston off the stern.
Corer piston off the stern.
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76375
Dorsk, Alexander
Corer piston off the stern.
Still Image
10/02/2007
graphics/KN191-dorsk/piston_stern.jpg
Jim Broda, center.
During September 2007 sea trials on the research vessel Knorr, WHOI technicians and researchers tested the powerful articulated hydraulic grapple that holds the ship's new "long-core" system during launch operations. Team members Terry Hammar, Jeff Hood, and Larry Costello (left background) stand by as Jim Broda (foreground center) signals Al Gagnon [2nd from the right] to position the corer for final rigging. The grapple and A-frame that surround the coring team were instrumented with sensors that fed position data to a programmable `logic? controller (PLC). Later in the test cruise, as `HAL? (the PLC's nickname) learned the numerous steps in launch and recovery sequences, Gagnon was able to switch from traditional hydraulic joysticks to a simple push of two buttons that engaged HAL's memory to precisely position and control the massive 150-foot-long corer.
Photo by Alexander Dorsk
© Woods Hole Oceanographic Institution
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