In reply to Michel Jullian's message of Sun, 10 Feb 2008 17:26:12 +0100: Hi, [snip] >Quote from the link below: "Wax-filled tubes inside the craft expand when it >is gliding through warmer water. This heat is used to push oil from a bladder >inside the hull to one outside, changing its buoyancy." > >Anyone knows how this works in more detail? From the above description one >would expect the glider's buoyancy to increase when reaching the warmer >surface (same mass, increased volume), instead of decreasing as required for >diving. > >Michel The outside bladder must contain compressed air. When the oil compresses the air further, more volume is filled with oil, and less with air, so the average density is higher and the craft sinks. Regards,
Robin van Spaandonk The shrub is a plant.
