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In page Aeronautics:
"In 1809 he began the publication of a landmark three-part treatise titled "On Aerial Navigation" (1809–1810).[4] In it he wrote the first scientific statement of the problem, "The whole problem is confined within these limits, viz. to make a surface support a given weight by the application of power to the resistance of air." He identified the four vector forces that influence an aircraft: thrust, lift, drag and weight and distinguished stability and control in his designs.[citation needed]
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