Testing an experimental version of my latest airship with added flying spiral blocks for fine control, I discovered a strange issue. The buoyancy of the balloons seems to drop suddenly as it gets to within maybe a quarter of a block off the ground. The airship is adjusted for neutral buoyancy, and two spirals are quite sufficient to move it up or down when airborne. Let it get too low though, and it loses buoyancy, and 'sticks' - the spirals lack the power to lift it, and I have to use main engine power to unstick. I think that the 'jerk' that occurs on spawning may incidentally be made worse by this effect. Very odd...

Video of issue: www.youtube.com/watch?v=smJQIKQiKhI&feature=youtu.be

Main thread on airship: besiege.freeforums.net/thread/1650/airship-manoeuverable-design-fun-fly

File for this version of airship: Zep-012FS00.bsg (37.68 KB)

My PC: CPU - Intel i7 950 3.06Ghz (overclocked to 3.80Ghz). RAM - 12 GB  GPU - XFX 6970 2GB.  OS - Win 7 Home Premium 64bit.