The Aeroplane Speaks [53]
flying speed.
Dope, to--To paint a fabric with a special fluid for the purpose of tightening and protecting it.
Density--Mass of unit volume, for instance, pounds per cubic foot.
Efficiency--Output Input
Efficiency (of an aeroplane as distinct from engine and propeller)-- Lift and Velocity Thrust (= aeroplane drift)
Efficiency, Engine--Brake horse-power Indicated horse-power
Efficiency, Propeller-- Thrust horse-power Horse-power received from engine (= propeller drift)
NOTE.--The above terms can, of course, be expressed in foot- pounds. It is then only necessary to divide the upper term by the lower one to find the measure of efficiency.
Elevator--A controlling surface, usually hinged to the rear of the tail- plane, the operation of which turns an aeroplane about an axis which is transverse to the direction of normal horizontal flight.
Empennage--See ``Tail-plane.''
Energy--Stored work. For instance, a given weight of coal or petroleum stores a given quantity of energy which may be expressed in foot-pounds.
Extension--That part of the upper surface extending beyond the span of the lower surface.
Edge, Leading--The front edge of a surface relative to its normal direction of motion.
Edge, Trailing--The rear edge of a surface relative to its normal direction of motion.
Factor of Safety--Usually taken to mean the result found by dividing the stress at which a body will collapse by the maximum stress it will be called upon to bear.
Fineness (of stream-line)--The proportion of length to maximum width.
Flying Position--A special position in which an aeroplane must be placed when rigging it or making adjustments. It varies with different types of aeroplanes. Would be more correctly described as ``rigging position.''
Fuselage--That part of an aeroplane containing the pilot, and to which is fixed the tail-plane.
Fin--Additional keel-surface, usually mounted at the rear of an aeroplane.
Flange (of a rib)--That horizontal part of a rib which prevents it from bending sideways.
Flight--The sustenance of a body heavier than air by means of its action upon the air.
Foot-pound--A measure of work representing the weight of 1 lb. raised 1 foot.
Fairing--Usually made of thin sheet aluminum, wood, or a light construction of wood and fabric; and bent round detrimental surface in order to give it a ``fair'' or ``stream-like'' shape.
Gravity--Is the force of the Earth's attraction upon a body. It decreases with increase of distance from the Earth. See ``Weight.''
Gravity, Specific--Density of substance Density of water. Thus, if the density of water is 10 lb. per unit volume, the same unit volume of petrol, if weighing 7 lb., would be said to have a specific gravity of 7/10, i.e., 0.7.
Gap (of an aeroplane)--The distance between the upper and lower surfaces of a biplane. In a triplane or multiplane, the distance between a surface and the one first above it.
Gap, Propeller--The distance, measured in the direction of the thrust, between the spiral courses of the blades.
Girder--A structure designed to resist bending, and to combine lightness and strength.
Gyroscope--A heavy circular wheel revolving at high speed, the effect of which is a tendency to maintain its plane of rotation against disturbing forces.
Hangar--An aeroplane shed.
Head-Resistance--Drift. The resistance of the air to the passage of a body.
Helicopter--An air-screw revolving about a vertical axis, the direction of its thrust being opposed to gravity.
Horizontal Equivalent--The plan view of a body whatever its attitude may be.
Impulse--A force causing a body to gain or lose momentum.
Inclinometer--A curved form of spirit-level used for indicating the attitude of a body relative to the horizontal.
Instability--An inherent tendency of a body, which, if the body is disturbed, causes it to move into a position as far as possible away from its first position.
Dope, to--To paint a fabric with a special fluid for the purpose of tightening and protecting it.
Density--Mass of unit volume, for instance, pounds per cubic foot.
Efficiency--Output Input
Efficiency (of an aeroplane as distinct from engine and propeller)-- Lift and Velocity Thrust (= aeroplane drift)
Efficiency, Engine--Brake horse-power Indicated horse-power
Efficiency, Propeller-- Thrust horse-power Horse-power received from engine (= propeller drift)
NOTE.--The above terms can, of course, be expressed in foot- pounds. It is then only necessary to divide the upper term by the lower one to find the measure of efficiency.
Elevator--A controlling surface, usually hinged to the rear of the tail- plane, the operation of which turns an aeroplane about an axis which is transverse to the direction of normal horizontal flight.
Empennage--See ``Tail-plane.''
Energy--Stored work. For instance, a given weight of coal or petroleum stores a given quantity of energy which may be expressed in foot-pounds.
Extension--That part of the upper surface extending beyond the span of the lower surface.
Edge, Leading--The front edge of a surface relative to its normal direction of motion.
Edge, Trailing--The rear edge of a surface relative to its normal direction of motion.
Factor of Safety--Usually taken to mean the result found by dividing the stress at which a body will collapse by the maximum stress it will be called upon to bear.
Fineness (of stream-line)--The proportion of length to maximum width.
Flying Position--A special position in which an aeroplane must be placed when rigging it or making adjustments. It varies with different types of aeroplanes. Would be more correctly described as ``rigging position.''
Fuselage--That part of an aeroplane containing the pilot, and to which is fixed the tail-plane.
Fin--Additional keel-surface, usually mounted at the rear of an aeroplane.
Flange (of a rib)--That horizontal part of a rib which prevents it from bending sideways.
Flight--The sustenance of a body heavier than air by means of its action upon the air.
Foot-pound--A measure of work representing the weight of 1 lb. raised 1 foot.
Fairing--Usually made of thin sheet aluminum, wood, or a light construction of wood and fabric; and bent round detrimental surface in order to give it a ``fair'' or ``stream-like'' shape.
Gravity--Is the force of the Earth's attraction upon a body. It decreases with increase of distance from the Earth. See ``Weight.''
Gravity, Specific--Density of substance Density of water. Thus, if the density of water is 10 lb. per unit volume, the same unit volume of petrol, if weighing 7 lb., would be said to have a specific gravity of 7/10, i.e., 0.7.
Gap (of an aeroplane)--The distance between the upper and lower surfaces of a biplane. In a triplane or multiplane, the distance between a surface and the one first above it.
Gap, Propeller--The distance, measured in the direction of the thrust, between the spiral courses of the blades.
Girder--A structure designed to resist bending, and to combine lightness and strength.
Gyroscope--A heavy circular wheel revolving at high speed, the effect of which is a tendency to maintain its plane of rotation against disturbing forces.
Hangar--An aeroplane shed.
Head-Resistance--Drift. The resistance of the air to the passage of a body.
Helicopter--An air-screw revolving about a vertical axis, the direction of its thrust being opposed to gravity.
Horizontal Equivalent--The plan view of a body whatever its attitude may be.
Impulse--A force causing a body to gain or lose momentum.
Inclinometer--A curved form of spirit-level used for indicating the attitude of a body relative to the horizontal.
Instability--An inherent tendency of a body, which, if the body is disturbed, causes it to move into a position as far as possible away from its first position.