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Use of a buoyancy engine to provide propulsion
In engineering, variable-buoyancy propulsion is the use of a buoyancy engine to provide propulsion for a vehicle. The concept was first explored in the
Variable-buoyancy_propulsion
Equipment for controlling the buoyancy of a diver
A buoyancy compensator (BC), also called a buoyancy control device (BCD), stabilizer, stabilisor, stab jacket, wing or adjustable buoyancy life jacket
Buoyancy_compensator_(diving)
Device that alters a body's buoyancy to provide propulsion
providing variable-buoyancy propulsion) such as with underwater gliders and some autonomous aircraft. For underwater applications, buoyancy engines typically
Buoyancy_engine
Type of autonomous underwater vehicle
vehicle (AUV) that employs variable-buoyancy propulsion instead of traditional propellers or thrusters. It employs variable buoyancy in a similar way to a
Underwater_glider
Type of rigid buoyancy control device
A variable-buoyancy pressure vessel system is a type of rigid buoyancy control device for diving systems that retains a constant volume and varies its
Variable-buoyancy pressure vessel
Variable-buoyancy_pressure_vessel
Scuba set with variable-density buoyancy control
diving system is a single cylinder, back-mounted scuba set with variable density buoyancy control. The gas cylinder is a carbon fibre over aluminium liner
Avelo_diving_system
Italian free diver
Travel gas Trimix Buoyancy and trim equipment Avelo diving system Buoyancy compensator Power inflator Dump valve Variable buoyancy pressure vessel Diving
Enzo_Maiorca
Powered device for diver mobility and range extension
A diver propulsion vehicle (DPV), also known as an underwater propulsion vehicle, sea scooter, underwater scooter, scuba sled or swimmer delivery vehicle
Diver_propulsion_vehicle
Skills required to scuba-dive safely
be able to achieve neutral buoyancy at all stages of the dive. Buoyancy is generally controlled by adding gas to variable volume equipment (BCD and dry
Scuba_skills
Balance and orientation skills of an underwater diver
is usually considered at approximately neutral buoyancy for a swimming scuba diver, and neutral buoyancy is necessary for efficient maneuvering at constant
Diver_trim
NASA astronaut training facility in Houston, Texas
The Neutral Buoyancy Laboratory (NBL) is an astronaut training facility and neutral buoyancy pool operated by NASA and located at the Sonny Carter Training
Neutral_Buoyancy_Laboratory
Swimming underwater, breathing gas carried by the diver
buoyancy aid. In 1971, the stabilizer jacket was introduced by ScubaPro. This class of buoyancy aid is known as a buoyancy control device or buoyancy
Scuba_diving
environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy and safety equipment, and tools for the task at hand. Many
Glossary of underwater diving terminology
Glossary_of_underwater_diving_terminology
Alphabetical listing of underwater diving related topics
of the inlet Variable-buoyancy pressure vessel – Type of rigid buoyancy control device Variable-buoyancy propulsion – Use of a buoyancy engine to provide
Index of underwater diving: T–Z
Index_of_underwater_diving:_T–Z
Lighter-than-air aircraft
via French) or lighter-than-air aircraft is an aircraft that relies on buoyancy to maintain flight. Aerostats include unpowered balloons (free-flying or
Aerostat
Equilibrium between buoyancy and weight of an immersed object
Neutral buoyancy occurs when an object's average density is equal to the density of the fluid in which it is immersed, resulting in the buoyant force balancing
Neutral_buoyancy
Movement of an object through air
lift associated with gliding or propulsive thrust, aerostatically using buoyancy, or by ballistic movement. Many things can fly, from animal aviators such
Flight
American aircraft company
prototype. The Aeroscraft is a planned heavy-lift, variable-buoyancy cargo airship featuring an onboard buoyancy management system, rigid structure, vertical
Aeros_Corporation
Ballast carried to counteract buoyancy
ballast weight added to a diver or diving equipment to counteract excess buoyancy. They may be used by divers or on equipment such as diving bells, submersibles
Diving_weighting_system
Watercraft capable of independent underwater operation
withstand higher pressure) or trim tanks. These are variable buoyancy pressure vessels, a type of buoyancy control device. The amount of water in depth control
Submarine
Watercraft with air cushion and twin hulls
and navigation systems. The 100A ship was used to test waterjet propulsion, variable geometry inlets and automatic ride control systems. The 100A and
Surface_effect_ship
Garment worn to provide thermal protection while wet
exposure, and stings from marine organisms. It also contributes extra buoyancy. The insulation properties of neoprene foam depend mainly on bubbles of
Wetsuit
Articulated pressure-resistant anthropomorphic housing for an underwater diver
negative buoyancy, and either the ability to walk or swim, or the use of finely controllable thrusters. Both walking and thruster propulsion have been
Atmospheric_diving_suit
Family of molluscs
extracts salt from it and diffuses it into the blood. The animal adjusts its buoyancy only in long term density changes by osmosis, either removing liquid from
Nautilus
Class of mollusks
positive buoyancy (i.e. the ability to float) would have come later, followed by swimming in the Plectronocerida and eventually jet propulsion in more
Cephalopod
Pool of water in which neutral buoyancy is used to train astronauts
A neutral buoyancy pool or neutral buoyancy tank is a pool of water in which neutral buoyancy is used to train astronauts for extravehicular activity
Neutral_buoyancy_pool
Deaths occurring while scuba diving or as a consequence of scuba diving
on scuba, deaths are usually associated with poor gas management, poor buoyancy control, equipment misuse, entrapment, rough water conditions, scuba depth
Scuba_diving_fatalities
Techniques used by divers and surface swimmers using swimfins
to maneuver when wearing swimfins. There are several styles used for propulsion, some of which are more suited to particular swimfin configurations. There
Finning_techniques
Bipropellant rocket — Bleed air — Booster rocket — Breakthrough Propulsion Physics Program — Buoyancy — Bussard ramjet — Canard — Centennial challenges — Center
Index of aerospace engineering articles
Index_of_aerospace_engineering_articles
Historic astronaut training facility
The Neutral Buoyancy Simulator was a neutral buoyancy pool located at NASA's George C. Marshall Space Flight Center (MSFC). The simulator was used from
Neutral_Buoyancy_Simulator
System of hydrophones
Furthermore, a minimum speed may have to be established depending on the buoyancy of the towed array (military arrays are ballasted to sink, geophysics arrays
Towed_array_sonar
World War II German torpedo
straight-running unguided design, controlled by a gyroscope. The TI had variable speed, running a distance of 5,000 m at 81 km/h (5,500 yd at 44kt), 7,500 m
G7a_torpedo
Equipment used to facilitate underwater diving
efficient propulsion Diver Propulsion Vehicle - to increase the range of the diver underwater Jacket buoyancy compensator Diver propulsion vehicle (scooter)
Diving_equipment
Crewed full ocean depth rated submersible
seating for an observer Surface ballast = 2,150 L (76 ft3) Syntactic foam buoyancy is used The pressure hull is a 1,500 mm (59 in) inside diameter by 90 mm
DSV_Limiting_Factor
Audaxpro Buoyancy compensators. Avelo (diving system) – Variable density scuba buoyancy control system – Integrated scuba cylinder and buoyancy compensator
List of diving equipment manufacturers
List_of_diving_equipment_manufacturers
Self-contained underwater breathing apparatus
harness and breathing apparatus assembly, such as a jacket or wing style buoyancy compensator and instruments mounted in a combined housing with the pressure
Scuba_set
Astronaut training in a neutral buoyancy environment
Neutral buoyancy simulation with astronauts immersed in a neutral buoyancy pool, in pressure suits, can help to prepare astronauts for the difficult task
Neutral buoyancy simulation as a training aid
Neutral_buoyancy_simulation_as_a_training_aid
Dimensionless ratio of thrust to weight of a propelled vehicle
under consideration, the actual performance will often be affected by buoyancy and local gravitational field strength. Table for Jet and rocket engines:
Thrust-to-weight_ratio
Watertight clothing that seals the wearer from cold and hazardous liquids
valve, it gave the diver precise and trouble-free buoyancy control in what became known as the variable volume dry suit. Since then, plastic watertight
Dry_suit
Powered lighter-than-air aircraft
can navigate through the air flying under its own power. Aerostats use buoyancy from a lifting gas that is less dense than the surrounding air to achieve
Airship
Downwards movement of one fluid within another
biogeochemical cycles. Two primary mechanisms transport water downward: buoyancy forcing and wind-driven Ekman transport (i.e., Ekman pumping). Downwelling
Downwelling
Free-diving self-propelled deep-sea submersible
cabin must withstand a huge pressure differential and is massively built. Buoyancy at the surface can be trimmed easily by replacing gasoline in the tanks
Bathyscaphe
Perpendicular-axis marine propulsion system
cyclorotor, cycloidal rotor, cycloidal propeller or cyclogiro, is a fluid propulsion device that converts shaft power into the acceleration of a fluid using
Cyclorotor
Class of airship
enough buoyancy to make the whole ship lighter than air. The negative buoyancy is overcome with the application of engine power. The buoyancy can change
Zeppelin_NT
Submarine hull design
efficient shape and extreme amounts of reserve buoyancy, with some numbers suggesting a reserve buoyancy fraction of >45% for the Project 941 (Shark)-class
Teardrop_hull
Facet of ballistics and aeronautics
original on 19 July 2014. Retrieved 1 February 2015. "Variable Vectoring Nozzle For Jet Propulsion Engines" Johnson, U.S. Patent 3,260,049 "F-22 Raptor
Thrust_vectoring
Neutral buoyancy facility at the University of Maryland
Laboratory is centered on the Neutral Buoyancy Research Facility, a 50-foot-diameter (15 m), 25-foot-deep (7.6 m) neutral buoyancy pool used to simulate the microgravity
Space Systems Laboratory (Maryland)
Space_Systems_Laboratory_(Maryland)
Type of back-mount scuba harness
with an attached buoyancy compensation device (BCD) which can be used to establish neutral buoyancy underwater and positive buoyancy at the surface. However
Backplate_and_wing
Procedures for safe ascent and descent in underwater diving
are functioning correctly, before releasing sufficient air from their buoyancy compensators (BCDs) to start sinking. As they leave the surface, the divers
Ascending and descending (diving)
Ascending_and_descending_(diving)
Type of non-rigid airship
monocoque outer structure and internal skeleton, together with a patented buoyancy mechanism that it claims can allow it to operate at high altitudes and
Metal-clad_airship
Austrian freediver and world record holder
to descend as far as possible and uses an air-filled balloon or other buoyancy device to return to the surface. Nitsch set the No Limit world record in
Herbert_Nitsch
Influence of the interaction between the user and the equipment on design
for the buoyancy of the diver and buoyant equipment. The distribution of buoyancy and ballast affect diver trim, which influences propulsion efficiency
Human factors in diving equipment design
Human_factors_in_diving_equipment_design
environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy and safety equipment, and tools for the task at hand. Many
Glossary of underwater diving terminology: A–C
Glossary_of_underwater_diving_terminology:_A–C
Ascent to the surface by a diver in an emergency
three basic mechanisms for ascending through the water column: Positive buoyancy, hydrodynamic thrust, and force directed through a static external object
Emergency_ascent
Diving using equipment configuration where scuba sets are clipped to the diver's sides
'dives' in cramped sumps did not prioritize the need for buoyancy control or underwater propulsion – so the bare minimum needed was a mask, a cylinder, a
Sidemount_diving
Fluid flow that occurs due to heterogeneous fluid properties and body forces
salt downward into wet soil due to the buoyancy of fresh water in saline. Variable salinity in water and variable water content in air masses are frequent
Convection
Underwater diving alongside a near vertical face
scuba. No special training is required, but this environment requires good buoyancy control skills for safety. The main characteristic of wall diving sites
Wall_diving
Worldwide rule- and record-keeping body for competitive breath-hold events
to be used and divers usually use breast strokes and wall-kicks for propulsions. Underwater diving portal AIDA Hellas – National representative of AIDA
AIDA_International
Swimming while inhaling through a snorkel
to facilitate freediving, or an inflatable snorkeling vest, a form of buoyancy aid, for safety. A snorkel is a device used for breathing air from above
Snorkeling
Vehicle or machine that can fly by gaining support from the air
have also become practical. Lighter-than-air aircraft or aerostats use buoyancy to float in the air in much the same way that ships float on the water
Aircraft
Aspects of physics which affect the underwater diver
physiological effects of diving, breathing gas planning and management, diver buoyancy control and trim, and the hazards and risks of diving. Changes in density
Diving_physics
Use of circular rotational force to mimic gravity
Strauss, Samuel (July 2008). "Space medicine at the NASA-JSC, neutral buoyancy laboratory". Aviation, Space, and Environmental Medicine. 79 (7): 732–733
Artificial_gravity
Alphabetical listings of underwater diving related topics
environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy control and safety equipment, and tools for the task at
Index_of_underwater_diving
Underwater diving using self contained breathing gas recycling apparatus
techniques, and either the dry suit or buoyancy compensator must be used for buoyancy control. The centre of buoyancy of the lungs and counterlungs must be
Rebreather_diving
Boat with rigid hull and inflatable tubes
and seaworthy. The inflated collar ensures that the vessel retains its buoyancy, even if the boat is taking on water. The RIB is an evolutionary development
Rigid_inflatable_boat
Autonomous underwater vehicle for exploring sinkholes in Mexico
accelerometers. Propulsion systems were also redundant, having six thrusters and two equivalent battery stacks. It was outfitted with a variable buoyancy system
DEPTHX
French two-person submarine built in 1959
safety. Denise is naturally positively buoyant, and is weighted to negative buoyancy with ballast weights that can be jettisoned in an emergency. If the craft
SP-350_Denise
environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy and safety equipment, and tools for the task at hand. Many
Glossary of underwater diving terminology: H–O
Glossary_of_underwater_diving_terminology:_H–O
component of propulsion. For apparent wind angles behind the sail, lift diminishes and drag increases as the predominant component of propulsion. For a given
Forces_on_sails
Hovercraft built for English Channel services
turboshaft engines each driving its own lift fan and pylon-mounted steerable propulsion propeller. The SR.N4 was the largest hovercraft then built, designed to
SR.N4
Relationship between operator capacity and the accumulated activities that must be done
unfamiliar. buoyancy problems - inability to establish appropriate buoyancy, particularly excessive buoyancy or severely inadequate buoyancy. trim problems
Task_loading
Diving in water-filled caves
This course emphasizes planning, procedures, environment, propulsion techniques, buoyancy skills, problem solving, equipment modification and the specialized
Cave_diving
Australian technical diver (1954–2005)
Travel gas Trimix Buoyancy and trim equipment Avelo diving system Buoyancy compensator Power inflator Dump valve Variable buoyancy pressure vessel Diving
Dave_Shaw
Diver who remains underwater for 24 hours or more
Trans. Morris Kemp. New York: Coward-McCann. Ecott, Tim (2001). Neutral Buoyancy: Adventures in a Liquid World. New York: Atlantic Monthly Press. pp. 249–250
Aquanaut
Acoustic sensing method
magnetostrictive materials is Galfenol. Other types of transducers include variable-reluctance (or moving-armature, or electromagnetic) transducers, where
Sonar
List of articles related to underwater diving grouped by topical relevance
environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy and safety equipment, and tools for the task at hand. There
Outline_of_underwater_diving
British hybrid airship prototype
lift in a similar manner to that of a conventional fixed-wing aeroplane. Buoyancy is also provided by helium contained within the envelope, the pressure
Hybrid Air Vehicles Airlander 10
Hybrid_Air_Vehicles_Airlander_10
Emergency transport of divers under a decompression obligation to a place of safety
the diving system against fire, loss of stability and critical loss of buoyancy. Hyperbaric evacuation is the last resort, but when it is no longer avoidable
Hyperbaric evacuation and rescue
Hyperbaric_evacuation_and_rescue
Container to supply high pressure gas for diving operations
full cylinders. Adjustments to ballasting can compensate for other buoyancy variables. Inability to remain consistently immersed at the shallowest decompression
Diving_cylinder
Copper helmet with rubberised canvas diving suit and weighted boots
pressure breathing air compressor, a diving knife, and weights to counteract buoyancy, generally on the chest, back, and shoes. Later models were equipped with
Standard_diving_dress
Agents and situations that pose a threat to the underwater diver
apparatus is usually reliable, but has been known to fail, and loss of buoyancy control or thermal protection can be a major burden which may lead to more
Diving_hazards
British volunteer cave diver who specialises in rescues
Travel gas Trimix Buoyancy and trim equipment Avelo diving system Buoyancy compensator Power inflator Dump valve Variable buoyancy pressure vessel Diving
John_Volanthen
Irish safety freediver (1977-2017)
Travel gas Trimix Buoyancy and trim equipment Avelo diving system Buoyancy compensator Power inflator Dump valve Variable buoyancy pressure vessel Diving
Stephen_Keenan
Tethered underwater mobile device operated by a remote crew
conditions such as high pressure, limited visibility, and the effects of buoyancy and water currents pose unique challenges. While land and aerial vehicles
Remotely operated underwater vehicle
Remotely_operated_underwater_vehicle
Aquatic or submarine environment
and suspended matter in the water column, and by the support provided by buoyancy. Nutrients usable by plants are dissolved in the water, making them easily
Underwater_environment
Scuba diving that has minimal environmental effect
open water dives over two days. The focus is on buoyancy, streamlining, weighting, trim and propulsion techniques beyond the standard entry level courses
Low_impact_diving
Oxygen rebreather
addressed by managing oxygen pressures. It also provided assistance with buoyancy, both in the ascent and after reaching the surface. The risk of decompression
Davis Submerged Escape Apparatus
Davis_Submerged_Escape_Apparatus
Large autonomous underwater vehicle for laying fibre-optic cable
cable available for dispensing. Each spool was surrounded by a toroidal buoyancy compensation tank that was filled as cable was dispensed. Theseus was powered
Theseus_(AUV)
Origins and development of diving using breathing gas carried by the diver
buoyancy aid. In 1971 the stabilizer jacket was introduced by ScubaPro. This class of buoyancy aid is known as a buoyancy control device or buoyancy compensator
History_of_scuba_diving
Distinct layer of temperature change in a body of water
upwelling – Oceanographic phenomenon of wind-driven motion of ocean water Buoyancy – Upward force that opposes the weight of an object immersed in fluid SOFAR
Thermocline
Recreational diver training and certification agency
Response primary and secondary care, and recommended PADI Peak Performance Buoyancy. The course covers diving with people with reduced mobility and supporting
Professional Association of Diving Instructors
Professional_Association_of_Diving_Instructors
English broadcaster and natural historian (born 1926)
Travel gas Trimix Buoyancy and trim equipment Avelo diving system Buoyancy compensator Power inflator Dump valve Variable buoyancy pressure vessel Diving
David_Attenborough
American astronaut (born 1975)
Travel gas Trimix Buoyancy and trim equipment Avelo diving system Buoyancy compensator Power inflator Dump valve Variable buoyancy pressure vessel Diving
Reid_Wiseman
Russian Navy deep sea submergence vehicle
and 100 millimetres (3.9 in) thickness welded from titanium alloy, with buoyancy provided by domestically produced syntactic foam. Habitable hull fits two
Konsul-class_submersible
Forensic investigation of underwater diving accidents
Insufficient buoyancy at the end of a dive is usually due to diver error in carrying too much weight or to a major failure of the dry suit or buoyancy compensator
Investigation of diving accidents
Investigation_of_diving_accidents
Class of American littoral combat ships
towed array and a compact low-frequency active and passive variable depth sonar. Propulsion is a CODAG (combined diesel and gas) system with speed of over
Freedom-class littoral combat ship
Freedom-class_littoral_combat_ship
Airtight bag used for underwater buoyant lifting when filled with air
which is used to lift heavy objects underwater by means of the bag's buoyancy. The heavy object can either be moved horizontally underwater by the diver
Lifting_bag
South African diver (1974–1994)
Travel gas Trimix Buoyancy and trim equipment Avelo diving system Buoyancy compensator Power inflator Dump valve Variable buoyancy pressure vessel Diving
Deon_Dreyer
Heavier-than-air aircraft with fixed wings generating aerodynamic lift
a fixed-wing aircraft are not necessarily rigid; kites, hang gliders, variable-sweep wing aircraft, and airplanes that use wing morphing are all classified
Fixed-wing_aircraft
Order of reptiles (fossil)
break down food, especially cephalopods, in a muscular gizzard, or to vary buoyancy, or both, has not been established. However, the total weight of the gastroliths
Plesiosaur
VARIABLE BUOYANCY-PROPULSION
VARIABLE BUOYANCY-PROPULSION
Boy/Male
Arabic, Muslim
A Float; Buoyant
Boy/Male
Anglo, British, English
Variable
Boy/Male
Hindi
Valuable.
Girl/Female
Armenian
Valuable.
Boy/Male
Muslim
Afloat, Buoyant
Boy/Male
Arabic, Muslim
Jubilant; Buoyant; Active
Boy/Male
Arabic, Muslim
A Float; Buoyant
Girl/Female
Tamil
Valuable
Girl/Female
Assamese, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Valuable
Boy/Male
Indian
Afloat, Buoyant
Boy/Male
Hindu, Indian
Valuable
Boy/Male
Vietnamese
Valuable.
Boy/Male
Muslim
Jubilant, Buoyant, Active
Boy/Male
Hawaiian
Valuable.
Girl/Female
Hawaiian
Buoyant; light.
Boy/Male
Arabic, Indian, Muslim
Valuable
Surname or Lastname
English
English : from the feminine personal name Mirabel, equated in medieval records with Latin mirabilis ‘marvellous’, ‘wonderful’ (in the sense ‘extraordinary’).
Boy/Male
Arabic, Bengali, Hindu, Indian, Kannada, Marathi, Muslim, Telugu
Valuable
Girl/Female
Gujarati, Hindu, Indian
Valuable
Girl/Female
Indian
Valuable
VARIABLE BUOYANCY-PROPULSION
VARIABLE BUOYANCY-PROPULSION
Girl/Female
Latin
Healer.
Girl/Female
Bengali, Hindu, Indian
Flow of Water
Girl/Female
Muslim
Faithfulness, Loyal
Girl/Female
Indian
Band, Bond, Link nexus
Girl/Female
Tamil
Adritya | அதà¯à®°à¯€à®¤à¯à®¯à®¾
The Sun
Girl/Female
Muslim/Islamic
The empowerer the honourer, the strengthener
Girl/Female
Indian
Growing God Blessings
Girl/Female
Teutonic
Outstanding warrior maiden.
Girl/Female
Muslim/Islamic
Acquirer obtainer, winner
Female
English
English variant spelling of French Francine, FRANCENE means "French."
VARIABLE BUOYANCY-PROPULSION
VARIABLE BUOYANCY-PROPULSION
VARIABLE BUOYANCY-PROPULSION
VARIABLE BUOYANCY-PROPULSION
VARIABLE BUOYANCY-PROPULSION
a.
Having the capacity of varying or changing; capable of alternation in any manner; changeable; as, variable winds or seasons; a variable quantity.
v. t. & i.
Having the quality of rising or floating in a fluid; tending to rise or float; as, iron is buoyant in mercury.
n.
An invariable quantity; a constant.
v. t. & i.
Light-hearted; vivacious; cheerful; as, a buoyant disposition; buoyant spirits.
n.
Cheerfulness; vivacity; liveliness; sprightliness; -- the opposite of heaviness; as, buoyancy of spirits.
a.
Arable; tillable.
a.
Liable to undergo a judicial examination; properly coming under the cognizance of a court; as, a cause may be triable before one court which is not triable in another.
n.
That which is variable; that which varies, or is subject to change.
n.
Lightness; buoyancy; act of making light.
n.
Buoyancy.
a.
Invariable.
adv.
In a variable manner.
n.
A quantity which may increase or decrease; a quantity which admits of an infinite number of values in the same expression; a variable quantity; as, in the equation x2 - y2 = R2, x and y are variables.
a.
Having value or worth; possessing qualities which are useful and esteemed; precious; costly; as, a valuable horse; valuable land; a valuable cargo.
pl.
of Buoyancy
a.
Friendly; kindly; sweet; gracious; as, an amiable temper or mood; amiable ideas.
a.
Liable to vary; too susceptible of change; mutable; fickle; unsteady; inconstant; as, the affections of men are variable; passions are variable.
v. t.
To represent by parable.
a.
Worthy; estimable; deserving esteem; as, a valuable friend; a valuable companion.
n.
Arable land; plow land.