Purity: Of the gas in an aerostat, the ratio of the volume of hydrogen or helium (depending on which is used) in the envelope to the total volume of gas contained.
Pusher Aeroplane: An aeroplane with pusher engine(s).
ALCLAD - Trademark of Alcoa used as a generic term to describe corrosion resistant Aluminum sheet formed from high-purity aluminum surface layers metallurgically bonded to high strength Aluminum Alloy core material.
ALCLAD - Trademark name of Alcoa for high-strength sheet aluminum clad with a layer (approximately 5.5% thickness per side) of high-purity aluminum, popularly used in airplane manufacture.
 See also: Combi, Flight, Hotel, Rate of climb, Emergency
  
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