21 terms

UAS 104

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Electrical Propulsion System
Stores energy in the form of batteries to power electric motors, driving propulsion systems
Energy Density
The amount of energy stored in a given system or region of space per unit volume
Fuel Cell
A type of battery that produces an electric current with a chemical reaction
Fuel Propulsion System
Stores energy in the form of gasoline or nitro fuels and uses an engine to drive propulsion systems
Engine
One or more working cylinders in which the process of combustion takes place within the cylinders
Propulsion
To drive, or cause to move, forward or onward; overcome forces of gravity and drag for prolonged flight
VTOL
Stands for Vertical Takeoff and Landing, an aircraft that has the ability to launch and land vertically, and then fly like a plane
Battery
Store chemical energy for conversion to electrical energy
Battery Memory
An effect observed in nickel-based batteries when charged from a less-than-fully-drained charge level, they develop a "memory" and pick up charging at the same level over and over essentially losing capacity
Capacity
Measure of energy stored in a battery when fully charged, measured in either watt-hours (Wh), kilowatt-hours (kWh), or ampere-hours (Ahr)
Discharge Rating
Measure of how quickly the battery can be safely discharged
Lithium-based Batteries
Most commonly used in UAS applications; high energy discharge rate
Nickel-based Batteries
Developed memory when charging, replaced by Lithium batteries
Number Of Cells
Battery specification that tells number of cells and whether are in series or parallel
Voltage
The electric energy charge difference of electric potential energy transported between two points
Airfoil
The shape of a wing or blade (of a propeller, rotor, or turbine) or sail as seen in cross-section
Gyroscopic
An apparatus consisting of a rotating wheel so mounted that its axis can turn freely in certain or all directions, and capable of maintaining the same absolute direction in space in spite of movements of the mountings and surrounding parts: used to maintain equilibrium, determine direction, etc.
Pitch
A theoretical distance covered by the prop in a single revolution
Propeller
Convert rotational motion into thrust
RPM
Revolutions per minute
Thrust
A linear reactive force exerted by a propeller, propulsive gases, etc., to propel a ship, aircraft, etc.