FIG. 7
IDEALIZED TIME ALTITUDE CURVES FOR VARIOUS BALLOON CONTROL SYSTEMS
NYJ - 27 AUG 47
[figure]
- Balloon floating at its ceiling
- Balloon floating on its floor
- All ballast expended
- Balloon descends
- Longer flight duration due to greater ballast efficiency
- Safety device rips balloon to insure no floating under 20,000 feet in the air lanes
- Increased lift due to superheat
- All ballast expended balloon descends
- Balloon descends due to increased temperature of trapped air in automatic ballast valve
- This is cause of flight oscillation
- Sunrise
- Sunset
- Ceiling rises as ballast drops from pre-set valve to compensate for diffusion
- Automatic ballast valve shuts off
- Automatic ballast valve starts operation
- Minimum Pressure Switch actuates automatic ballast valve
- Release
LOCAL TIME
ALTITUDE (Thousands of Feet)