Vortices -- tornado-like patterns of air generated in the wake of jet 'planes -- are becoming a growing hazard for light aircraft.
SV's aircraft landing and taking off (2 shots)
SV Tornado-like air patterns in wake of aircraft.. named vortices
GV Plane passing, leaving vortices trail
MV Light aircraft in flight
AERIAL V..of ground from light aircraft
MV INTERIOR..'plane model Jumbo Jet revolving on stand beside water tank in laboratory, with scientist attending (3 shots)
MV Model aircraft being passed over water tank
MV Scientists examine model aircraft
MV Model aircraft shooting dye into water tank (2 shots)
Initials ES. 1428 ES. 1446
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Background: Vortices -- tornado-like patterns of air generated in the wake of jet 'planes -- are becoming a growing hazard for light aircraft. Scientists in Laurel, Maryland, are conducting tests on the invisible air masses. A six-foot (about two metres) model aircraft shoots dye into a 300-feet (about 100 metres) water tank in order to simulate the air currents while cameras record the event for future analysis.
The tests are the first to be done under controlled conditions. Until now research on vortices was based on full-size 'planes flying at low level past smoke towers.