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Hydrodynamics of screw propellers
Propeller theory is the science governing the design of efficient propellers. A propeller is the most common propulsor on ships, and on small aircraft
Propeller_theory
Aircraft propulsion component
In aeronautics, an aircraft propeller, also called an airscrew, is an aircraft propulsion device that converts rotary motion from an engine or other power
Propeller_(aeronautics)
Ratio of freestream speed to tip speed
ratio is a useful non-dimensional quantity in helicopter and propeller theory, since propellers and rotors will experience the same angle of attack on every
Advance_ratio
Device that transmits rotational power into linear thrust on a fluid
A propeller (often called a screw if on a ship or an airscrew if on an aircraft) is a type of propulsor with a rotating hub and radiating blades that
Propeller
Engine designed for use in powered aircraft
engine, (see above), but the crankshaft is fixed to the airframe and the propeller is fixed to the engine case, so that the crankcase and cylinders rotate
Aircraft_engine
Mathematical process by William Froude
entire propeller or rotor. One of the key difficulties lies in modelling the induced velocity on the rotor disk. Because of this the blade element theory is
Blade_element_theory
Theory in propeller or turbine physics
momentum theory is a theory that combines both blade element theory and momentum theory. It is used to calculate the local forces on a propeller or wind-turbine
Blade_element_momentum_theory
Mathematical model in fluid dynamics
dynamics, momentum theory or disk actuator theory is a theory describing a mathematical model of an ideal actuator disk, such as a propeller or helicopter
Momentum_theory
Turbine engine driving an aircraft propeller
A turboprop is a gas-turbine engine that drives an aircraft propeller. A turboprop consists of an intake, reduction gearbox, compressor, combustor, turbine
Turboprop
Norwegian aerodynamicist (1897–1978)
aeroelastic work, gave damping properties of structures and expanded general propeller theory. During World War II Theodorsen was called on for the analysis and
Theodore_Theodorsen
Airline of the United States (1928–1982)
Aeronautics Board blamed the crash on metal fatigue due to the "whirl-mode" propeller theory. In 2022, Braniff Airways sponsored a Texas State Historical Marker
Braniff_International_Airways
Machine for continuous flow gas compression
or no camber although in some cases the blade design was based on propeller theory. The machines, driven by steam turbines, were used for industrial purposes
Axial_compressor
British aerodynamicist (1892-1934)
and memoranda dealing with aerofoil and propeller theory. His book, The Elements of Aerofoil and Airscrew Theory was the single most important instrument
Hermann_Glauert
Fan that induces gas flow mostly parallel to the shaft
dominant theories that solve the parameters for axial fans: Slipstream Theory Blade Element Theory In the figure, the thickness of the propeller disc is
Axial_fan_design
New Zealand blogger and activist
samples of their product which he pulls apart online for viewers; from propeller theory to electronic breakdowns at a circuit board level. Simpson's personal
Bruce_Simpson_(blogger)
Use of a cavitation bubble to reduce skin friction drag on a submerged object
enable high-speed travel. Applications include torpedoes and propellers, but in theory, the technique could be extended to an entire underwater vessel
Supercavitation
Conspiracy theory about contrails
The chemtrail conspiracy theory /ˈkɛmtreɪl/ is the erroneous belief that long-lasting condensation trails left in the sky by high-flying aircraft are actually
Chemtrail_conspiracy_theory
British engineer and naval architect
Blade element theory Froude's law of similitude Froude number Froude efficiency Froude's experiments Froude–Krylov force Propeller theory Track transition
William_Froude
American naval architect
annular airfoil and ducted propeller theory; propeller blade strength; hydrodynamic properties of blade sections; and propeller cavitation, ventilation and
William_B._Morgan
Air- or watercraft design in which the propulsion device is behind the engine
most ubiquitous propeller example is a common outboard motor for a small boat. “Pusher configuration” describes the specific (propeller or ducted fan)
Pusher_configuration
Perpendicular-axis marine propulsion system
A cyclorotor, cycloidal rotor, cycloidal propeller or cyclogiro, is a fluid propulsion device that converts shaft power into the acceleration of a fluid
Cyclorotor
German aircraft designers
theory". Siegfried and Walter Günter were born on 8 December 1899 in Thuringia. Avid flight enthusiasts, at 16 they had developed their own propeller
Siegfried_and_Walter_Günter
Type of steam-powered vessel
is propelled by one or more steam engines that typically move (turn) propellers or paddlewheels. The first steamships came into practical usage during
Steamship
British engineer and naval architect
described momentum theory, both used in the systematic evaluation of propeller design efficiency and as components of blade element momentum theory. Robert became
Robert_Edmund_Froude
Low-pressure voids formed in liquids
that may damage machinery. As a concrete propeller example: The pressure on the suction side of the propeller blades can be very low and when the pressure
Cavitation
Type of steam powered ship
steam-powered vessel propelled by two screw propellers, one on either side of the plane of the keel. All propellers produce a transverse thrust, also called
Twin-screw_steamer
Type of pump consisting of a propeller in a pipe
common type of pump that essentially consists of a propeller (an axial impeller) in a pipe. The propeller can be driven directly by a sealed motor in the
Axial-flow_pump
hydraulic, and civil engineer and aircraft designer who invented the "intubed propeller" for aircraft, a concept that some aviation historians view as the predecessor
Luigi_Stipa
Polish engineer and inventor (1844–1938)
independently developed the blade element theory (BET), a mathematical process used to determine the behavior of propellers. Drzewiecki was born into Polish aristocratic
Stefan_Drzewiecki
Streamlined body for generating lift
capable of generating significantly more lift than drag. Wings, sails and propeller blades are examples of airfoils. Foils which work in a similar way submerged
Airfoil
Characteristic of rotors/propellers
aircraft will have a very high disk loading on its propellers. The momentum theory or disk actuator theory describes a mathematical model of an ideal actuator
Disk_loading
French aeronautical engineer
Arts et Métiers ParisTech in Angers, where his studies included the theory of propeller design. He became a member of the Aero-Club de France in December
Lucien_Chauvière
Marine propulsion system
jet of water for propulsion. The mechanical arrangement may be a ducted propeller (axial-flow pump), a centrifugal pump, or a mixed flow pump which is a
Pump-jet
Reed (1874), aerospace engineer who developed the modern metal aircraft propeller, which won the 1925 Collier Trophy William Hallock (1879), physicist,
List of Columbia College people
List_of_Columbia_College_people
Admiral-class battlecruiser/fast battleship
powered by four Brown-Curtis geared steam turbines, each driving one propeller shaft using steam provided by 24 Yarrow boilers. The battlecruiser's turbines
HMS_Hood
Matching of warplane's gun and propeller
aircraft to fire its forward-firing armament through the arc of its spinning propeller without bullets striking the blades. This allowed the aircraft, rather
Synchronization_gear
Interactions among inertial, elastic, and aerodynamic forces
structural vibration. Propeller whirl flutter is a special case of flutter involving the aerodynamic and inertial effects of a rotating propeller and the stiffness
Aeroelasticity
specialised form of thrust bearing used in ships, to resist the thrust of the propeller shaft and transmit it to the hull. Early screw-propelled steamships used
Thrust_block
Propeller-type water turbine which has adjustable blades
The Kaplan turbine is a propeller-type water turbine which has adjustable blades. It was developed in 1913 by Austrian professor Viktor Kaplan, who combined
Kaplan_turbine
designed the propeller of the Baldwin airship, which was considered a marvel for efficiency, and yet met his death by the breaking of a propeller. "1908 –
List of unusual deaths in the 20th century
List_of_unusual_deaths_in_the_20th_century
Russian regional airliner
Developed by UZGA (Ural Works of Civil Aviation), the aircraft would in theory be produced the "Aviakor" aircraft plant in the industrial city of Samara
TVRS-44
Speed of electromagnetic waves
deriving the theory of relativity, and so showed that the parameter c had relevance outside of the context of light and electromagnetism. In the theory of relativity
Speed_of_light
Elastic object that stores mechanical energy
Water turbine Wind generator Windmill Aerofoil Sail Wing Rudder Flap Propeller Electronics Vacuum tube Transistor Diode Resistor Capacitor Inductor Vehicles
Spring_(device)
Optical illusion
spoked rotating object will show it, such as helicopter rotors, aircraft propellers and car rims. In these recorded media, the effect is a result of temporal
Wagon-wheel_effect
Loitering munition
but is somewhat smaller. Like the Shahed-136, the Gerbera has a pusher propeller driven by an internal combustion engine. The engine is typically a DLE60
Gerbera_(drone)
German climatologist and geophysicist (1880–1930)
observations made. They would travel on the ice cap using two innovative, propeller-driven snowmobiles, in addition to ponies and dog sleds. Wegener felt
Alfred_Wegener
UFO legend caused by 1947 balloon crash
1947 near Roswell, New Mexico, has become the basis for UFO conspiracy theories alleging that the United States military recovered a crashed extraterrestrial
Roswell_incident
Former office building in Manhattan, New York
associated with the collapse. NIST found no evidence to support conspiracy theories such as the collapse being the result of explosives; it found that a combination
7 World Trade Center (1987–2001)
7_World_Trade_Center_(1987–2001)
1905 naval battle of the Russo-Japanese War
33.1618°N 129.7005°E / 33.1618; 129.7005 Buiniy had boiler and screw propeller troubles, 20-years-old sail-rig-equipped Donskoi could not exceed 13 knots
Battle_of_Tsushima
Measure of a civilization's evolution
they?". Without the discovery of artificial sources, however, Shklovsky's theory that civilizations self-destruct as a result of large-scale social conflicts
Kardashev_scale
On 25 October, the ocean liner sank off the coast of Brazil after its propeller shaft fractured and damaged its hull. It sank slowly in the presence of
List of maritime disasters in the 20th century
List_of_maritime_disasters_in_the_20th_century
and Tony Bilson. Golfer Jack Newton loses right arm after walking into propeller at Sydney Airport. Joan Sutherland and Luciano Pavarotti perform at Opera
Timeline_of_Sydney
First powered aircraft built by the Wright brothers
used a 12 horsepower (9 kilowatts) gasoline engine powering two pusher propellers. Employing "wing warping", it was relatively unstable and very difficult
Wright_Flyer
Experimental wind-powered vehicle
may have a shroud around them (ducted fan) or constitute an unducted propeller, and which may adjust orientation to face the apparent wind. The rotor
Blackbird (wind-powered vehicle)
Blackbird_(wind-powered_vehicle)
Country in Central Europe
Kryštof Rad (inventor of sugar cubes), Josef Ressel (inventor of the screw propeller and modern compass). Historically, most scientific research was recorded
Czech_Republic
State of matter
or dramatic change in direction, such as the trailing edge of a boat propeller or a sharp corner in a pipe. A liquid in an area of low pressure (vacuum)
Liquid
crashed near Centerville, Tennessee, United States, because of wing and propeller icing; all eight passengers and three crew members were killed. February
List of accidents and incidents involving commercial aircraft
List_of_accidents_and_incidents_involving_commercial_aircraft
running at impact, although it was producing so little power that the propeller was barely turning." Although the Academy continues to fly the type, another
List of accidents and incidents involving military aircraft (1990–1999)
List_of_accidents_and_incidents_involving_military_aircraft_(1990–1999)
1911 maritime incident
resulting in the flooding of two of her watertight compartments and a twisted propeller shaft. Olympic settled slightly by the stern, but in spite of the damage
Olympic–Hawke_collision
US airliner with 4 piston engines, 1947
Wasp Major radial engines and structural and control problems with their propellers. Only 55 Stratocruisers were built for airlines, along with the single
Boeing_377_Stratocruiser
Airspace violation and shootdown incident
craft had a propeller and could be maneuvered. U.S. officials told foreign diplomats in Beijing that the craft had rudders and propellers. A Chinese Foreign
2023_Chinese_balloon_incident
German LASH carrier that sank in 1978
reasons in a severe North Atlantic storm in December 1978. The most accepted theory is that one or more rogue waves hit München and damaged her, so that she
MS_München
Retrieved May 15, 2018. Welch, Alex (September 25, 2018). "The Big Bang Theory adjusts up, The Good Doctor adjusts down: Monday final ratings". TV by the
List_of_The_Resident_episodes
Japanese: Etsuko Kozakura Omochao (/ˈoʊmoʊtʃaʊ/) is a robot Chao with a propeller on its head. Omochao was introduced in Sonic Adventure as part of the
List of Sonic the Hedgehog characters
List_of_Sonic_the_Hedgehog_characters
divided into sections: dynamometer brake (Block 10), which simulates the propeller; propulsion electric motor (Block 20); turbogenerators (Block 30); and
Brazilian Navy Nuclear Program
Brazilian_Navy_Nuclear_Program
History for British light bomber
started to complement the RAF Bomber Command campaign. In terms of better propeller-driven night fighters, the Heinkel He 219 and Junkers Ju 388 simply did
De Havilland Mosquito operational history
De_Havilland_Mosquito_operational_history
Ukrainian long-range UAV
other videos online. The Bober drone appear to have a rear-mounted pusher propeller and potentially has a sensor package in the nose. The drone was commissioned
Bober_(drone)
Airbreathing jet engine which is typically used in aircraft
which gave a smaller diameter, although longer, engine. By replacing the propeller used on piston engines with a high speed jet of exhaust, higher aircraft
Turbojet
Plane wing that angles backwards or forwards
920 km/h, combining swept wings with propeller propulsion, also remains in service today, being the fastest propeller-powered production aircraft. In Britain
Swept_wing
Beluga whale (c. 2009–2024)
September in the harbour at Alta, where he showed signs of injury from propellers and people were observed throwing things at him and pushing things into
Hvaldimir
American turboprop engine
Rolls-Royce Dart , where the turbine drove both the compressor and the propeller reduction gearbox. This epicyclic gearbox was relatively long. Air entered
General_Electric_T31
propeller was flown in for the Cornelia Marie, but repairs were delayed because the propeller is left handed, while the Cornelia Marie's propellers are
List of Deadliest Catch episodes
List_of_Deadliest_Catch_episodes
Cold War-era American jet bomber
Performance was comparable to a conventional B-47, and its reversible propellers shortened the landing roll, but the idea was not pursued.[citation needed]
Boeing_B-47_Stratojet
Austrian philosopher and logician (1889–1951)
of Physics Sir Arthur Schuster. Wittgenstein worked on the design of a propeller with small jet (tip jet) engines on the end of its blades, something he
Ludwig_Wittgenstein
Jet engine where combustion takes place in supersonic airflow
weight ratio Variable cycle engine Windmill restart Propellers Components Propeller governor Propeller speed reduction unit Principles Autofeather Blade
Scramjet
Dimensionless quantity in fluid dynamic
usually used to talk about the set of Mach numbers for which linearised theory may be used, where for example the (air) flow is not chemically reacting
Mach_number
First operational jet-powered fighter aircraft
Junkers Jumo 210 engine was mounted in the V1 prototype's nose, driving a propeller, to test the Me 262 V1 airframe. When the BMW 003 engines were installed
Messerschmitt_Me_262
British ocean liner from 1911 to 1935
place where she received her propellers. Olympic was fitted with three propellers. The two three-bladed wing propellers were driven by two triple-expansion
RMS_Olympic
WWII Bulgarian military equipment
November 2022. Todorov 2003, p. 70. Chonev, Chony, The Bulgarian Navy, Propeller Publishing, Sofia, 2005, pp. 89-90 ISBN 9549367215 "Вимпел". vimpel.boinaslava
List of Bulgarian military equipment of World War II
List_of_Bulgarian_military_equipment_of_World_War_II
English electronic music duo
Tracks Peak chart positions UK AUS FRA HUN ITA NZ 1996 Dive Dive! Ron’s Theory Lethal Cut Go Faster — — — — — — 1997 Propellerheads Bang On! Spybreak!
Propellerheads
Romanian automobile
(a device allowing aircraft-mounted machine guns to fire through the propeller without striking the blades themselves) that replaced the clumsy mechanical
Constantinesco_(automobile)
Crewed full ocean depth rated submersible
system to drop ballast, and a cluster of five, fixed direction, ducted propeller, marine thrusters at each of the port and starboard ends of the outer
DSV_Limiting_Factor
Fictional universe
he travels to Skyloft in a pedal-powered wooden shack with helicopter propellers, which also serves as his shop. In Breath of the Wild and Tears of the
Universe of The Legend of Zelda
Universe_of_The_Legend_of_Zelda
aircraft for Do 214 Göppingen Gö 9 - development aircraft for pusher propeller used on Do 335 Pfeil (Gothaer Waggonfabrik) Gotha LD.1/2/6/7 -
List of military aircraft of Germany by manufacturer
List_of_military_aircraft_of_Germany_by_manufacturer
1864 science fiction novel by Jules Verne
based on Humphry Davy’s geochemistry (including the chemical oxidation theory of volcanic eruption) which was later disapproved. However, for an understanding
Journey to the Centre of the Earth
Journey_to_the_Centre_of_the_Earth
Ocean liner known for rescuing survivors of RMS Titanic
Propulsion 2 × Wallsend Slipway Co. quadruple expansion steam engines Twin propellers Speed 14 knots (26 km/h; 16 mph) (service) Capacity 1,800 passengers:
RMS_Carpathia
Indian nationalist leader (1897–1945)
out of the plane. It was the portside engine, or a part of it, and the propeller. The plane swung wildly to the right and plummeted, crashing, breaking
Subhas_Chandra_Bose
Multi-national four-engine turboprop military transport aircraft
contrast to the overwhelming majority of multi-engine propeller driven aircraft where all propellers turn in the same direction. The counter-rotation is
Airbus_A400M_Atlas
is a dimensionless quantity used in design and analysis of rotorcraft, propellers and wind turbines. Rotor solidity is a function of the aspect ratio and
Rotor_solidity
Ship sunk in Lake Huron in 1913
Summer 1987 – National Museum of the Great Lakes". "Charles S. Price (Propeller), U207539, capsized, 8 Nov 1913". images.maritimehistoryofthegreatlakes
SS_Charles_S._Price
Ancient Egyptian stone artifact
However, due to their rotational symmetry (or non-chirality), use as a propeller or turbine is impossible. It was also shown that it was possible to use
Sabu_disk
Recipient of the Victoria Cross (1918–1944)
memorial to Gibson and Warwick. It is a granite stone topped by the twisted propeller of a Lancaster. It was unveiled by Group Captain Leonard Cheshire on 7
Guy_Gibson
Subclass of sessile marine crustaceans
impair their efficiency by causing hydrodynamic drag. Barnacles on a boat propeller Barnacles on a ship. The resulting biofouling creates drag, slowing the
Barnacle
as well as famous steamships including the SS Great Britain, the first propeller-driven ocean-going iron ship, and SS Great Eastern which laid the first
Culture_of_the_United_Kingdom
Widespread reports of unidentified UAVs
investigators identified this with high confidence as a Beechcraft Baron 58 propeller plane experiencing turbulence, which created wingtip vortices that formed
2024 United States drone sightings
2024_United_States_drone_sightings
Implement or device used to inflict damage, harm, or kill
treason Warlord Theory Air supremacy Appeasement Command of the sea Deterrence theory Full-spectrum dominance Overmatch Just war theory Principles of war
Weapon
Aircraft engine that produces thrust by emitting a jet of gas
engines. They give higher speed and greater fuel efficiency than piston and propeller aeroengines over long distances. A few air-breathing engines made for
Jet_engine
Munition for penetrating hardened or deeply buried targets
and a sturdy dynamic propeller on the rear of the bomb. The fuze is armed when the bomb is released, and detonates when the propeller stops turning and the
Bunker_buster
1967 Israeli attack on United States Navy ship
that the Noratlas aircraft flew so close to Liberty that noise from its propellers rattled the ship's deck plating. It was later reported, based on information
USS_Liberty_incident
Device only intended to turn itself off
unproductive. The version of the useless machine that became famous in information theory (basically a box with a simple switch which, when turned "on", causes a
Useless_machine
travel, tourism, insurance
PROPELLER THEORY
PROPELLER THEORY
PROPELLER THEORY
PROPELLER THEORY
PROPELLER THEORY
PROPELLER THEORY
PROPELLER THEORY
PROPELLER THEORY
PROPELLER THEORY
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