weather, wind, etc.
- Posted by: "Pete Lilja" plilja@...
Fri Jun 29, 2007 10:18 am (PST)
Being new to HAB I am curious as to weather / wind
predictions favorable to high altitude flights.
>>>>>>Pete:The surface winds at launch are by far the most
important factor as they can destroy a partially
filled balloon before it can be launched. Strong
shears at altitude have been said to tear apart big
plastic bag balloons, I'm not sure that any premature
failures of the near-spherical latex balloons have
been linked to that. Regardless of macroscopic surface
winds situation, a good fill and launch can often be
made out of a natural depression, a tree-lined field,
canyon if the surface winds are across and not down
the canyon. Hot air balloon pilots call these sort of
launch sites 'sucker holes,' as the inexperienced hot
air balloon pilots will launch with an unwarranted
sense of confidence in the impending flight. I
recommend use of toy latex balloons as pilot balloons
or 'pi-balls' to visualize the ascent trajectory. If
the pi-ball hits a powerline or structure, that's a
good indication that the larger balloon with payloads
- Mark Caviezel ng0x