Factors Controlling a Near Space Flight L. Paul Verhage 10 June 2014.

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Presentation transcript:

Factors Controlling a Near Space Flight L. Paul Verhage 10 June 2014

Five Factors Lift Weight/Drag Maximum Balloon Volume Wind Speed Wind Direction

Lift and Weight Lift and weight/drag act in opposite directions Weight and drag resists the ascent of the balloon The force of drag depends on how fast the balloon moves Air density and balloon size also affect the amount of drag (Hank’s Knee) Lift, weight, and drag govern the ascent rate of the balloon

Maximum Balloon Volume Balloon volume doubles every 18,000 feet Initial fill volume governs the amount of available expansion Same size balloons display some variability

Wind Speed and Direction Balloons are captive of the wind Wind speed and direction changes as altitude changes Launching inside a high pressure system Stratospheric turn around Jet stream

Three Useful Online Applications LiftWin BallTrak UKHAS Flight Prediction

LiftWin Calculates the lifting behavior of a weather balloon Ascent Rate Burst Altitude

BallTrak and UKHAS Predicts flight path of a balloon flight Inputs: Ascent rate and balloon burst altitude Output: Flight path plotted on Google Maps