Delta Keel

The Delta Keel is a device found in some form in most airships. The Delta designation stands for Dampener. It is essentially a floatrock ballast, fixed into the airship structure to give it some resistance to vertical movement. The size and strength of the Delta Keel depends on the ship's design and is a tradeoff: a strong Keel makes the ship sluggish or power-hungry to move up or down. A weak or no Keel requires greater buoyancy to support the ship at all times. An ideal Delta Keel is a balance that takes some of the strain off the Antimass tanks, but still allows the ship to climb effectively.

See also: Double Lambda Keel