Glossary

Aerodynamic: (of an object) having a shape that reduces the drag from air moving past it.

Airfoil: A structure with curved surfaces designed to give the most favourable ratio of lift to drag in flight.

Angle of Attack (AoA): The angle between the chord of an airfoil and the direction of the surrounding undisturbed flow of gas or liquid.

Axis: An imaginary line about which a body rotates

Circular Pitch: The distance between two teeth along the pitch circle (length of the arc).

Corrosion: (of metal or other materials) be destroyed or damaged slowly by chemical action.

Drag: The longitudinal force applied by air or any other fluid on a moving object to slow it down.

Driven Gear: The gear that is rotated by the driver gear and is usually connected to the output shaft is known as the driven gear.

Driver Gear: The gear that causes the other gears to rotate is called the driver gear.

Force: A force is something that changes the motion of an object or causes a stationary object to move or experience stress.

Gear: A circular machine part that is one of a set of toothed wheels.

Kilowatt-hours: A measure of electrical energy equivalent to a power consumption of 1,000 watts for 1 hour.

Lift: The perpendicular force applied by air or any other fluid on an object to raise it to a higher level.

Longitudinal: lengthwise

Pinion: A small gear engaging with a large gear.

Pitch circle: An imaginary circle that gives an idea about the size of a gear.

Pitch diameter: The diameter of the pitch circle. Pressure angle: The angle between the line defining the radius of the pitch circle to the point where the pitch circle intersects a tooth, and the tangent line to that tooth at that point.” (instructables)

Resistance: Stopping effect exerted by one material thing on another. In case of current and electricity, it is the property of a material to oppose the passage of electric current.

Speed: A measure of how fast or slow an object is travelling.

Structural integrity: Structural integrity is the ability of a structure to withstand an intended load without breaking down.

Tangent: (of a line or plane) touching, but not intersecting, a curve or curved surface.

Torque: A twisting force that tends to cause rotation.

Vane: A broad blade attached to a rotating axis or wheel which pushes or is pushed by wind or water and forms part of a machine or device such as a windmill, propeller, or a turbine.

Watt: the SI unit of power, corresponding to the amount of energy consumed or produced in unit time.