A Person Changes Altitude By Changing Attitude
On January 13, 1997, reports Richard Conniff in National Geographic, adventurer Steve Fossett climbed into the cock-pit of a hot-air balloon in St. Louis, Missouri, and rose into the sky with the ambition of being the first to circle the globe in a balloon. After three days he had crossed the Atlantic and was flying at 24,500 feet eastward over Africa. The prevailing wind carried him on a direct course for the country of Libya, and that was a problem. Libya had refused him permission to fly in its air space, which meant he could be shot down. Of course, hot-air balloons cannot turn. When a change of direction is called for, what they must do is change altitude. At a higher or lower altitude a balloonist can usually find a crosswind blowing in a different direction. Fossett vented helium, and the balloon dropped 6,300 feet, where it came under the control of a wind blowing southeast. Fossett skirted safely south of Libya, then heated the balloon, rose almost 10,000 feet and caught a...