ⓘ Propulsion

Propulsion

Propulsion means to push forward or drive an object forward. The term is derived from two Latin words: pro, meaning before or forward ; and pellere, meaning to drive. A propulsion system consists of a source of mechanical power, and a propulsor. A technological system uses an engine or motor as the power source commonly called a powerplant, and wheels and axles, propellers, or a propulsive nozzle to generate the force. Components such as clutches or gearboxes may be needed to connect the motor to axles, wheels, or propellers. Biological propulsion systems use an animals muscles as the powe ...

Automotive engine

As of 2013, there were a wide variety of propulsion systems available or potentially available for automobiles and other vehicles. Options included internal combustion engines fueled by petrol, diesel, propane, or natural gas; hybrid vehicles, plug-in hybrids, fuel cell vehicles fueled by hydrogen and all electric cars. Fueled vehicles seem to have the advantage due to the limited range and high cost of batteries. Some options required construction of a network of fueling or charging stations. With no compelling advantage for any particular option car makers pursued parallel development tr ...

Bicycle drivetrain systems

Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels. Most also include some type of a mechanism to convert speed and torque via gear ratios.

Biefeld–Brown effect

The Biefeld–Brown effect is an electrical phenomenon that produces an ionic wind that transfers its momentum to surrounding neutral particles. It describes a force observed on an asymmetric capacitor when high voltage is applied to the capacitors electrodes. Once suitably charged up to high DC potentials, a thrust at the negative terminal, pushing it away from the positive terminal, is generated. The effect was named by inventor Thomas Townsend Brown who claimed that he did a series of experiments with professor of astronomy Paul Alfred Biefeld, a former teacher of Brown whom Brown claimed ...

Continuous track

Continuous track is a system of vehicle propulsion used in tracked vehicles, running on a continuous band of treads or track plates driven by two or more wheels. The large surface area of the tracks distributes the weight of the vehicle better than steel or rubber tyres on an equivalent vehicle, enabling continuous tracked vehicles to traverse soft ground with less likelihood of becoming stuck due to sinking. Modern continuous tracks can be made with soft belts of synthetic rubber, reinforced with steel wires, in the case of lighter agricultural machinery. The more common classical type is ...

Dean drive

The Dean drive was a device created and promoted by inventor Norman Lorimer Dean that he claimed to be a reactionless drive. Dean claimed that his device was able to generate a uni-directional force in free space, in violation of Newtons third law of motion from classical physics. His claims generated notoriety because, if true, such a device would have had enormous applications, completely changing human transport, engineering, space travel and more. Dean made several controlled private demonstrations of a number of different devices, however no working models were ever demonstrated publi ...

Distributed propulsion

For distributed propulsion on rail see: Multiple unit Distributed propulsion is a type of powered flight propulsion system for fixed-wing aircraft in which engines are distributed about a vessel. Its goal is to increase performance in fuel efficiency, emissions, noise, landing field length and handling performance. DP is typically accomplished by spanwise distribution of partially or fully embedded multiple small engines or fans along the wing. Alternatively, it may involve ducting exhaust gases along the wings entire trailing edge.

EGTS

An Electric Green Taxiing System is an electric taxiing system which allows aircraft to taxi and pushback without requiring the use of aircraft engines, and is designed to reduce fuel volumes used by aircraft and reduce greenhouse gas emissions during ground operations. EGTS technology enables aircraft to avoid using their main engines during taxiing and instead taxi autonomously under their own electrical power, using the Auxiliary Power Unit generator. The system is designed for single-aisle aircraft, such as the Airbus A320 and the Boeing 737.

Electrogravitics

Electrogravitics is claimed to be an unconventional type of effect or anti-gravity force created by an electric fields effect on a mass. The name was coined in the 1920s by the discoverer of the effect, Thomas Townsend Brown, who spent most of his life trying to develop it and sell it as a propulsion system. Through Browns promotion of the idea it was researched for a short while by aerospace companies in the 1950s. Electrogravitics is popular with conspiracy theorists with claims that it is powering flying saucers and the B-2 Stealth Bomber. Since apparatus based on Browns ideas have ofte ...

Electromagnetic propulsion

Electromagnetic propulsion, is the principle of accelerating an object by the utilization of a flowing electrical current and magnetic fields. The electrical current is used to either create an opposing magnetic field, or to charge a field, which can then be repelled. When a current flows through a conductor in a magnetic field, an electromagnetic force known as a Lorentz force, pushes the conductor in a direction perpendicular to the conductor and the magnetic field. This repulsing force is what causes propulsion in a system designed to take advantage of the phenomenon. The term electroma ...

Engine displacement

Engine displacement is the measure of the cylinder volume swept by all of the pistons of a piston engine, excluding the combustion chambers. It is commonly used as an expression of an engines size, and by extension as a loose indicator of the power an engine might be capable of producing and the amount of fuel it should be expected to consume. For this reason displacement is one of the measures often used in advertising, as well as regulating, motor vehicles. It is usually expressed using the metric units of cubic centimetres cc or cm 3, equivalent to millilitres or litres l or L, or – par ...

Flatrod system

The flatrod system was an invention of the mining industry that enabled the mechanical movement generated by a water wheel to be transferred over short distances. It was invented in the 16th century and by the 18th century was being used to transmit power up to four kilometres. Flatrod systems were widely used in the Harz and Ore Mountains of Germany as well as in Cornwall, England and Bergslagen in Sweden. A replica of a flatrod system may be seen in Bad Kosen in Germany on the River Saale and there is a replica water wheel, used to drive flatrods, in Clausthal-Zellerfeld in the Upper Har ...

Ground propulsion

Ground propulsion is any mechanism for propelling solid bodies along the ground, usually for the purposes of transportation. The propulsion system often consists of a combination of an engine or motor, a gearbox and wheel and axles in standard applications. The primary and most natural type of propulsion is the use of muscle power. The invention of the wheel allowed for the development of vehicles like Carts and Wagons that make more efficient use of muscle power, allowing larger loads to be transported. Vehicles drawn by humans and domesticated animals are not economically as important as ...

Ion-propelled aircraft

An ion-propelled aircraft or, shortened ionocraft, is an aircraft that uses electrohydrodynamics to provide lift or thrust in the air without requiring combustion or moving parts. Current designs do not produce sufficient thrust for manned flight or useful loads.

Marine thruster

A marine thruster is a device for producing directed hydrodynamic thrust on a marine vehicle. The thrust direction may be fixed or steerable. Examples of marine thrusters include screw propellers, Voith-Schneider propellers, waterjets, ducted propellers, tunnel bow thrusters and stern thrusters, azimuth thrusters, rim-driven thrusters, ROV and submersible drive units. Marine thrusters may be used for propulsion, maneuvering and steering, attitude control and dynamic positioning.

Powered aircraft

A powered aircraft is an aircraft that uses onboard propulsion with mechanical power generated by an aircraft engine of some kind. Aircraft propulsion nearly always uses either a type of propeller, or a form of jet propulsion. Other potential propulsion techniques such as ornithopters are very rarely used.

Aero-propulsion Systems Test Facility

The Aero-propulsion Systems Test Facility, located at Arnold Engineering Development Complex is a unique national facility designed to test aircraft propulsion systems in true mission environments without leaving the ground. The test unit is owned by the United States Air Force and operated by National Aerospace Solutions.

Reactionless drive

A reactionless drive is a hypothetical device producing motion without the exhaust of a propellant. A propellantless drive is not necessarily reactionless when it constitutes an open system interacting with external fields; but a reactionless drive is a particular case of a propellantless drive that is a closed system, presumably in contradiction with the law of conservation of momentum. Reactionless drives are often considered similar to a perpetual motion machine. The name comes from Newtons third law, often expressed as, "for every action, there is an equal and opposite reaction." Many ...

RF resonant cavity thruster

A radio frequency resonant cavity thruster is a device that is claimed to be a spacecraft thruster. It is purported to generate thrust by reflecting microwaves internally in the device, in violation of the law of conservation of momentum and other laws of physics. The device is also known as an EmDrive and has been often referred to by the media as the Impossible Drive. It was introduced in 2001 by Roger Shawyer. There exists no official design for this device, and neither of the people who claim to have invented it have committed to an explanation for how it could operate as a thruster or ...

WheelTug

WheelTug is an in-wheel electric taxi system under development by a company of the same name, Wheeltug is a subsidiary of and majority owned by Borealis Exploration. The system will enable airplanes to taxi forward and backward without needing a tow tractor or using main jet engines. WheelTug will accomplish this goal through twin electric motors installed in the nose wheels; these motors will be powered by the aircrafts Auxiliary Power Unit. According to Aviation Week, the WheelTug system was projected to provide savings in ground turnaround time and increased aircraft utilization. In Jun ...

                                     

ⓘ Propulsion

  • Propulsion means to push forward or drive an object forward The term is derived from two Latin words: pro, meaning before or forward and pellere, meaning
  • Laser propulsion is a form of beam - powered propulsion where the energy source is a remote usually ground - based laser system and separate from the reaction
  • An electrically - powered spacecraft propulsion system uses electrical, and possibly also magnetic fields, to change the velocity of a spacecraft. Most of
  • Spacecraft propulsion is any method used to accelerate spacecraft and artificial satellites. Space propulsion or in - space propulsion exclusively deals
  • Beam - powered propulsion also known as directed energy propulsion is a class of aircraft or spacecraft propulsion that uses energy beamed to the spacecraft
  • Marine propulsion is the mechanism or system used to generate thrust to move a ship or boat across water. While paddles and sails are still used on some
  • Jet propulsion is the propulsion of an object in one direction, produced by ejecting a jet of fluid in the opposite direction. By Newton s third law, the
  • Air - independent propulsion AIP is any marine propulsion technology that allows a non - nuclear submarine to operate without access to atmospheric oxygen
  • electric propulsion IEP or full electric propulsion FEP or integrated full electric propulsion IFEP is an arrangement of marine propulsion systems
  • Field propulsion is the concept of spacecraft propulsion where no propellant is necessary but instead momentum of the spacecraft is changed by an interaction