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Pilot Balloon

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pilot balloon: see weather balloon weather balloon, balloon used in the measurement and evaluation of mostly upper atmospheric conditions (see atmosphere). Information may be gathered during the vertical ascent of the balloon through the atmosphere or during its motions once it has reached a
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pilot balloon [′pī·lət bə‚lün]
(engineering)
A small balloon whose ascent is followed by a theodolite in order to obtain data for the computation of the speed and direction of winds in the upper air.
Pilot Balloon 

a small rubber balloon filled with hydrogen and released in free flight to determine wind velocity and direction at different altitudes or to establish the altitude of the lower boundary of clouds. The pilot balloon ascends at a nearly constant speed, calculated according to the lifting force and the weight of the balloon envelope. The altitude of the balloon is determined as the product of the vertical speed and the time between the moment of release and the moment of recording. The wind velocity and direction at different altitudes are computed according to simultaneous readings of the altitude of the balloon and the angles (elevation angle above the horizon and the azimuth) observed through an aerological theodolite.
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It takes a lot of skill to pilot balloons," says Ninomiya.
Lift off! Taking to the skies with helium balloons by Chiang, Mona / Science World
We send up pilot balloons to find out what is happening at 2,000, 3,000, 4,000 feet because we want to get the smoke up and out.
BURNING SEASON SPARKS COMPLAINTS by The Register-Guard (Eugene, OR)
Produced in response to a Department of the Army Operational Need Statement, the one-man portable Miniature Observation Kit consists of one Kestrel Pocket Weather Tracker (see Armada issue 4/2003 page 104), a Lighted Survey Master--which is a dual-function instrument incorporating a direct sighting compass and inclinometer -and miniature helium tanks with 100 28-cm pilot balloons.
A little bird told me by Armada International
 
 
 
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