Aerodynamics (Lanchester)/Glossary
GLOSSARY.
Aerofoil (Author), from the Greek ἀέρος and φυλλον, lit. an air-leaf. Denoting the organ of sustentation of an aerodone or aerodrome, or the spread wings of a bird. A supporting member (or members collectively) of undefined form; thus pterygoid aerofoil, an aerofoil of wing-like form; plane aerofoil, an aeroplane, etc., §§ 112, 128, 172.
Aerodone (Author), from the Greek ἀερο-δόνητος, lit. tossed in mid air; soaring. To denote a gliding or soaring model or machine; in particular, any gliding or soaring appliance destitute of propelling apparatus or auxiliary parts; in contradistinction to aerodrome.
Aerodonetics (Author, see aerodone). The science specifically involved in problems connected with the stability or equilibrium of an aerodone or aerodrome, or of birds in flight, and with the phenomenon of soaring. Equivalent to Aerodromics, as proposed by Langley (p. vi. footnote 1).
Aerodrome (Langley), from the Greek ἀερο-δρόμος, lit. traversing the air; an air runner; originally proposed to denote a gliding or soaring model or machine, or a flying machine of any kind. Restricted by the author to the latter signification; a fully -developed flying appliance; a power-propelled aerodone, or an aerodone furnished with directive apparatus. Something more than single aerodone. (Preface, p. v., footnote.)
Aerodromics (Langley; see aerodrome), originally proposed to denote the science concerned in the equilibrium, etc., of an aerodrome; equivalent to aerodonetics as used by the author. Proposed to be extended by the author to include the aerodynamics and aerodonetics of flight. The whole science concerned with the flight of an aerodrome. Thus the present work may be entitled a Treatise on Aerodromics, and the whole subject of aerial flight would be dealt with at a College or University by a lecturer or professor of Aerodromics.
Apteroid (Author), from the Greek α, πτερόν and ειδος, the converse of pterygoid. Thus apteroid aspect, with the greater dimension arranged in the direction of flight; (the reverse to that which obtains in the wing plan-form of birds), §§ 150, 151.
Aspect (Dict.), proposed by Langley in its present usage to denote the arrangement of the plan-form of an aeroplane, or other aerofoil, in relation to the direction of flight, § 144.
Ichthyoid (Dict.), fish-shaped, here applied to denote a body of practical stream-line form, § 9.
Peripteral. See Periptery.
Peripteroid. See Periptery.
Periptery (Diet.), proposed by the author in its present usage as denoting the region round about the wing or in the vicinity of the aerofoil (Greek. περι and πτερόν), § 107. Hence peripteral, as in peripteral theory (Ch. 4), peripteral area, § 210; peripteral zone, § 210; peripteral motion, § 126 {see also footnote 2, p, viii.. Preface). Hence also peripteroid motion, §nb122 (Greek, περι, πτερόν and ειδος, the form of flow proper to the inviscid fluid in a doubly connected region, resulting from the superposition of a cyclic motion on one of translation. Resembling the motion in the pieriptery, lit. round-about-the-wing-like.
Pterygoid (Diet.), icing like. Hence pterygoid aspect, with the lesser dimension in the direction of flight, as in the wing plan-form of a bird, § 152.
Sweep (Diet.), proposed by the author in its present usage to denote the cross-sectional area of the stratum of fluid, supposed by hypothesis to be that to whose inertia the supporting reaction is due, § 160.