|
What is the
difference between soft and hard ballast? I’m
planning to use only sealed ballast tanks (valves at top and bottom) to help
maintain neutral buoyancy at varying depths. I have assumed that soft ballast would be an open bottom
ballast tank that would allow buoyancy to change with depth, but have talked
myself into the possiblity that hard ballast might actually refer to hard
weight (trim, drop). Also, the
term variable ballast would mean
any ballast tank that air could be added to or subtracted from, right? Thaks, Cliff |