| K-Gun Depth Charge Projector (Mk 6) | |
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The Depth Charge Projector Mark 6, Mod 1, commonly called the K-Gun, is used to launch the 300 pound cylindrical charge (Mk 6) or the 200 pound teardrop charge (Mk 9/14). The small "T" knob on top of the dome opens the breech for insertion of an adjustable black powder firing charge. The K-gun fired a single Mk 6/9/14 depth charge to ranges of 50-150 yards to the side of the ship. An arbor, or "spade" with a tray and a stem held the depth charge in place during firing. The K-Gun consists of a smooth-bore barrel attached to an expansion chamber fitted with a breech mechanism. The breech plug houses a firing mechanism that can be fired by local percussion by lanyard or electrical firing controlled from the bridge. After firing a special release link in the depth charge securing chain allowed the arbor and depth charge to separate. The projector angle is fixed at 45 degrees and different ranges are obtained by using different cartridges. These are assembled in 3-inch cases using three standard weights of black powder charges resulting in ranges of 50, 75, and 120 yards for Mk 6 and 60, 90, and 150 yards for the Mk9 and Mk 14 depth charges. |
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This is an open breech of the K-gun looking down into the
breech expansion chamber. The breech block is hanging down and, based
on the size and number of the interlocking threads, the pressure must
be substantial during firing. Once the propellant charge is inserted
into the chamber, the breech is closed using the handle visible at the
bottom of the photo. Once closed, the handle is turned 90 degrees
clockwise to engage the breech lock and arm the striker. The outer
ring is clearly marked "Safe" and "Ready", so even
an army guy like me can figure it out.
The spring-loaded firing pin is in the center of the breech with the tripping lever firmly lodged under it. The lanyard is attached to the firing lever that, when pulled, leverages pressure against the tripping sear and forces it (and the firing pin) upwards. At full extension, the tripping sear pops free and lets the firing pin spring down into the percussion primer of the 3" shell. This shows a K-gun ready to fire.
This shows a K-gun after firing. Notice the lanyard has fully extended the firing lever and the tripping sear has popped free of the firing pin. Notice that there is a "voluntary" safety mechanism near the "Ready" stamp. |
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