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Topic Review
Breguet Deux-Ponts
The Breguet 761/763/765 are a family of 1940s and 1950s French double-deck transport aircraft produced by Breguet Aviation. The aircraft were normally called the Deux-Ponts (Double-Decker) but it was not an official name.
  • 1.7K
  • 11 Oct 2022
Topic Review
Jaguar 420 and Daimler Sovereign (1966–69)
The Jaguar 420 (pronounced "four-twenty") and its Daimler Sovereign equivalent were introduced at the October 1966 London Motor Show and produced for two years as the ultimate expression of a series of "compact sporting saloons" offered by Jaguar throughout that decade, all of which shared the same wheelbase. Developed from the Jaguar S-Type, the 420 cost around £200 more than that model and effectively ended buyer interest in it, although the S-Type continued to be sold alongside the 420/Sovereign until both were supplanted by the Jaguar XJ6 late in 1968.
  • 1.7K
  • 18 Nov 2022
Topic Review
Messerschmitt Me 410
The Messerschmitt Me 410 Hornisse (Hornet) was a German heavy fighter and Schnellbomber used by the Luftwaffe during World War II. Though an incremental improvement of the Me 210, it had a new wing plan, longer fuselage and engines of greater power. The changes were significant enough for the aircraft to be renamed the Me 410.
  • 1.6K
  • 27 Oct 2022
Topic Review
Embraer Legacy 500
The Embraer Legacy 500/450 (EMB-550/EMB-545) are Brazilian mid-size business jets launched by Embraer in April 2008, the first of their size with a flat-floor stand-up cabin and fly-by-wire. The longer 500, which typically carries 4 passengers over 3,125 nmi (5,790 km) with room for up to 12, first flew on November 27, 2012, and was certified on August 12, 2014. The shorter 450 first flew on December 28, 2013, was certified on August 11, 2015, carries 4 passengers over 2,900 nmi (5,370 km) and can accommodate up to 9.
  • 1.6K
  • 06 Dec 2022
Topic Review
Mediterranean U-boat Campaign (World War I)
Script error: No such module "Infobox military conflict". The Mediterranean U-boat Campaign in the Mediterranean Sea was fought by Austria-Hungary and German Empire (with some support by the Ottoman Empire) against the Allies during World War I. It was characterised by the ability of the Central Powers to raid with near impunity during the first years of the war, causing substantial shipping losses, until the introduction of the convoy system allowed the Allies to drastically cut their losses from 1917 on.
  • 1.6K
  • 18 Oct 2022
Topic Review
Boeing–Sikorsky RAH-66 Comanche
The Boeing–Sikorsky RAH-66 Comanche is an American stealth armed reconnaissance and attack helicopter designed for the United States Army. Following decades of development, during 2004, the RAH-66 program was canceled prior to mass production commencing, by which point nearly US$7 billion had been already spent on the program. During the early 1980s, the U.S. Army started to formulate requirements for the replacement of its helicopters then in service, which resulted in the launch of the Light Helicopter Experimental (LHX) program. Nearly a decade later, following the refinement of requirements, evaluation of submissions, and the rebranding of the program as the Light Helicopter (LH) program, during April 1991, the Army announced the selection of the Boeing–Sikorsky team's design as the contest winner, shortly after which a contract for construction of prototypes was awarded. The Comanche was to incorporate several advanced elements, such as stealth technologies, and a number of previously untried design features. Operationally, it was to employ advanced sensors in its reconnaissance role, where it was intended to designate targets for the AH-64 Apache. It was also armed with one rotary cannon and could carry missiles and rockets in internal bays and optionally on stub wings for light attack duties. Two RAH-66 prototypes were constructed and underwent flight testing between 1996 and 2004. On 1 June 2000, the program entered its $3.1 billion engineering and manufacturing development (EMD) phase. However, during 2002, the Comanche program underwent heavy restructuring; the number of Comanches that were to be purchased was cut to 650. At the time, the projected total cost for the full production of the Comanche in such numbers stood at $26.9 billion. As early as the late 1990s, the Government Accountability Office (GAO) had reported that it had "serious doubts" about the program, observing that the Comanche would "consume almost two thirds of the whole Aviation budget by Fiscal Year 2008". Multiple government agencies had acted to cut the number of Comanches on order, but, as a consequence of the heavy reductions to the numbers to be procured, the unit costs soared. On 23 February 2004, the U.S. Army announced the termination of the Comanche program, stating they had determined that the RAH-66 would require numerous upgrades to be viable on the battlefield and that the service would instead direct the bulk of its rotary systems funds to renovating its existing attack, utility, and reconnaissance helicopters. The Army also announced new plans to accelerate the development of unmanned aerial vehicles (UAVs), which could also perform the scouting role intended for the Comanche, but with less risk. Since program cancellation, both of the prototypes have been placed on public display.
  • 1.6K
  • 17 Nov 2022
Topic Review
Meermin (VOC Ship)
Meermin (Dutch pronunciation: [ˈmeːrmɪn] (listen)) was an 18th-century Dutch cargo ship of the hoeker type, one of many built and owned by the Dutch East India Company. She was laid down in 1759 and fitted out as a slave ship before her maiden voyage in 1761, and her career was cut short by a mutiny of her cargo of Malagasy people. They had been sold to Dutch East India Company officials on Madagascar , to be used as company slaves in its Cape Colony in southern Africa. Half her crew and almost 30 Malagasy lost their lives in the mutiny; the mutineers deliberately allowed the ship to drift aground off Struisbaai, now in South Africa, in March 1766, and she broke up in situ. As of 2013, archaeologists are searching for the Meermin's remains.
  • 1.6K
  • 26 Oct 2022
Topic Review
Observation Seaplane
Observation seaplanes are military aircraft with flotation devices allowing them to land on and take off from water. Their primary purpose was to observe and report enemy movements or to spot the fall of shot from naval artillery, but some were armed with machineguns or bombs. Their military usefulness extended from World War I through World War II. They were typically single-engine machines with catapult-launch capability and a crew of one, two or three. Most were designed to be carried aboard warships, but they also operated from seashore harbors.
  • 1.6K
  • 31 Oct 2022
Topic Review
Framework and Classification of Battery System Architectures
Battery system architectures are methodologically derived in order to find the key type differences. In a first step, the system levels are identified and distinguished. In order to be able to completely cover the solution space of battery system architectures, a distinction is also made between mono- and multifunctional materials. Based on the system levels, a framework for possible architectures is derived. Four system architecture generations with a total of eight different types are identified and analyzed in the dimensions “Nomenclature”, “Approach”, “Omitted Components” and “Industry Examples”. In this way, upcoming system architectures, such as cell-to-pack and cell-to-chassis, can be clearly differentiated. Finally, fundamental product characteristics for the four system generations are derived and compared.
  • 1.6K
  • 17 Apr 2023
Topic Review
Capella (Engineering)
Capella is an open-source solution for model-based systems engineering (MBSE). Hosted at polarsys.org, this solution provides a process and tooling for graphical modeling of systems, hardware or software architectures, in accordance with the principles and recommendations defined by the Arcadia method. Capella is an initiative of PolarSys, one of several Eclipse Foundation working groups.
  • 1.5K
  • 23 Nov 2022
Topic Review
40M Turán
The Turán was a Hungarian medium tank of World War II. It was inspired and used the technology-based solutions found on the design of the Czechoslovak Škoda T-21 medium tank prototype, it was produced in two main variants: the 40M Turán (or Turán I) with a 40 mm gun and the 41M Turán (or Turán II) with a 75 mm gun. A total of 424 were made. A prototype variant, the 43M Turán (or Turán III) was also turned out but did not go into production. Prototypes were manufactured, but work on the project stopped in 1944 when the mass-producing terminated in the country.
  • 1.5K
  • 01 Nov 2022
Topic Review
V2X Applications in Road Tunnels
Tunneling and tunnel equipment should be one of the main disciplines in urban planning and engineering. It is important to provide a solution for all road users, including road users in tunnels, where, for example, navigation is crucial, and its functionality may have implications on traffic throughout the city. However, the most important to ensure are the safety applications, e.g., smooth passing of an emergency vehicle, dissemination of warning information, as well as about the failure in tunnels or tunnel closure. Vehicular communication (V2X—vehicle-to-everything) is one of them.
  • 1.5K
  • 20 May 2022
Topic Review
BFR Spaceship
The Big Falcon Rocket (officially shortened to BFR) is a privately funded fully reusable launch vehicle and spacecraft system in development by SpaceX. The overall space vehicle architecture includes both launch vehicles and spacecraft, as well as ground infrastructure for rapid launch and relaunch, and zero-gravity propellant transfer technology to be deployed in low Earth orbit (LEO). The payload capacity to Earth orbit of at least 100,000 kg (220,000 lb) makes BFR a super heavy-lift launch vehicle. The first orbital flight is tentatively planned for 2020. SpaceX has been developing a super heavy-lift launch vehicle for many years, with the exact design and nomenclature of the vehicle undergoing multiple revisions over time. Before 2016, the vehicle was referred to as the Mars Colonial Transporter (MCT), though very few details about the design of the MCT were ever made public. Starting from 2016, SpaceX began sharing annual updates with the public, detailing the designs and uses of their upcoming new launch vehicle. In 2016, SpaceX CEO Elon Musk presented the vehicle at the International Astronautical Congress as the ITS launch vehicle, forming a core part of Musk's comprehensive vision for an Interplanetary Transport System (ITS). The ITS vehicle had a 12-meter (39 ft) core diameter, but was only intended for interplanetary travel. In September 2017, the design (now known as the BFR) was scaled down to 9 meters (30 ft) While the ITS had been solely aimed at Mars transit and other interplanetary uses, SpaceX pivoted to a plan that would support all SpaceX launch service provider capabilities with a single set of 9-meter vehicles: Earth orbit, lunar orbit, Interplanetary spaceflight, and potentially, even intercontinental passenger transport on Earth. In September 2018, a redesign of the second stage was announced, adding steerable canards, two radially adjustable fins also acting as landing legs, and a third leg that looks like a vertical stabilizer but has no aerodynamic function due to the special re-entry profile of the spacecraft. The launch vehicle design is dependent on the concurrent development work on the Raptor rocket engines, which are cryogenic methalox-fueled engines to be used for both stages of the BFR launch vehicle. Development on the Raptor began in 2012, leading to engine testing which began in 2016. The BFR system is intended to completely replace all of SpaceX's existing space hardware (the Falcon 9 and Falcon Heavy launch vehicles, and the Dragon spacecraft), initially aiming at the Earth-orbit launch market, but explicitly adding substantial capability to support long-duration spaceflight in the cislunar and Mars transport flight environments.
  • 1.5K
  • 14 Oct 2022
Topic Review
HOTOL
HOTOL, for Horizontal Take-Off and Landing, was a 1980s United Kingdom design for a single-stage-to-orbit (SSTO) spaceplane that was to be powered by an airbreathing jet engine. Development was being conducted by a consortium led by Rolls-Royce and British Aerospace (BAe). Designed as a single-stage-to-orbit (SSTO) reusable winged launch vehicle, HOTOL was to be fitted with a unique air-breathing engine, the RB545 or Swallow, that was under development by British engine manufacturer Rolls-Royce. The propellant for the engine technically consisted of a combination of liquid hydrogen/liquid oxygen; however, it was to employ a new means of dramatically reducing the amount of oxidizer needed to be carried on board by utilising atmospheric oxygen as the spacecraft climbed through the lower atmosphere. Since propellant typically represents the majority of the takeoff weight of a rocket, HOTOL was to be considerably smaller than normal pure-rocket designs, roughly the size of a medium-haul airliner such as the McDonnell Douglas DC-9/MD-80. While HOTOL's proof-of-concept design study was being carried out, attempts were made by both industry and the British government to establish international cooperation to develop, produce, and deploy the spacecraft. In spite of American interest in the programme, there was little appetite amongst the members of the European Space Agency (ESA), and the British government was not prepared to depart from ESA cooperation. Additionally, technical issues were encountered, and there were allegations that comparisons with alternative launch systems such as conventional rocket vehicle using similar construction techniques failed to show much advantage to HOTOL. In 1989, funding for the project ended. The termination of development work on HOTOL led to the formation of Reaction Engines Limited (REL) to develop and produce Skylon, a proposed spacecraft based on HOTOL technologies, including its engine.
  • 1.5K
  • 28 Oct 2022
Topic Review
Soyuz-TMA
The Soyuz-TMA is a revision of the Soyuz spacecraft, superseded in 2010 by the Soyuz TMA-M. (T – транспортный – Transportnyi – meaning transport, M – модифицированный – Modifitsirovannyi – meaning modified, A – антропометрический, – Antropometricheskii meaning anthropometric). It is used by the Russian Federal Space Agency for human spaceflight. The spacecraft features several changes to accommodate requirements requested by NASA in order to service the International Space Station, including more latitude in the height and weight of the crew and improved parachute systems. It is also the first expendable vehicle to feature a "glass cockpit". Soyuz-TMA looks identical to the earlier Soyuz-TM spacecraft on the outside, but interior differences allow it to accommodate taller occupants with new adjustable crew couches.
  • 1.5K
  • 14 Oct 2022
Topic Review
Mount Polley Tailings Spill
The Mount Polley tailings spill occurred in the Cariboo region of central British Columbia, Canada . The spill began 4 August 2014 with a breach of the Imperial Metals-owned Mount Polley copper, gold and silver mine tailings pond, releasing its water and slurry with years worth of mining waste into Polley Lake. The spill flooded Polley Lake, creating a plug at Hazeltine Creek, and continued into nearby Quesnel Lake and Cariboo River. By 8 August the four-square-kilometre (1.5 sq mi) sized tailings pond had been emptied of the majority of supernatant (process water) that sits atop the settled crushed rock solids (mining waste, or 'tailings'). The cause of the dam breach and subsequent tailings spill has been investigated with a final report published 31 January 2015. Imperial Metals had a history of operating the pond beyond capacity since at least 2011. Remediation and reconstruction has been underway at the site since 2014. These efforts have included investigation on impacts to human health and safety and affected ecosystems while removing the tailings spill, reconstructing creek shorelines, installing fish habitats, and replanting trees and other local vegetation. Investigation by the remediation team showed elevated levels of selenium, arsenic and other metals consistent with historical tests before the dam breach. These initial reports had been concerned about the chemical impact of the tailings spill on the surrounding environment, but it was determined through subsequent investigation and remediation that the challenge posed by tailings spill was physical in nature.
  • 1.5K
  • 07 Nov 2022
Topic Review
Orion's Arm
Orion's Arm (also called the Orion's Arm Universe Project, OAUP, or simply OA and formerly known as the Orion's Arm Worldbuilding Group) is a multi-authored online science fiction world-building project, first established in 2000 by M. Alan Kazlev, Donna Malcolm Hirsekorn, Bernd Helfert and Anders Sandberg and further co-authored by many people since. Anyone can contribute articles, stories, artwork, or music to the website. A large mailing list exists, in which members debate aspects of the world they are creating, discussing additions, modifications, issues arising, and work to be done. A computer game and a tabletop role-playing game are being developed by the community, within the OA milieu. There is an ezine for Orion's Arm fiction, art, and commentary, called Voices: Future Tense, add-ons for the Celestia program to displaying Orion's Arm planets, spacecraft and other objects, and additional transhumanist flavored SF illustrations. The first published Orion's Arm book, a collection of five novellas set within the OA universe, called Against a Diamond Sky, was released in September 2009 by Outskirts Press. The second published Orion's Arm book, called After Tranquility, was released in February 2014.
  • 1.5K
  • 14 Oct 2022
Topic Review
Chrysler Pacifica (CS)
The Chrysler Pacifica is a mid-size crossover produced by Chrysler from 2003 to 2007, for the model years 2004 to 2008. The Pacifica was the first jointly engineered product of the 1998 DaimlerChrysler "merger of equals." Chrysler developed the vehicle in 30 months at a cost below $1 billion. The CUV was inspired by the 1999 Chrysler Pacifica and 2000 Chrysler Citadel concept cars. The production model was first introduced at the 2002 New York International Auto Show. Chrysler marketed the Pacifica as a "sports-tourer," building the vehicle at the Windsor Assembly Plant, alongside the long-wheelbase minivans from January 2003 through November 2007. The "Pacifica" name was briefly used as a trim package on the Dodge Daytona for 1987–1988 after the Chrysler Laser was discontinued. In January 2016, the Pacifica name was revived for a 2017 model year minivan, which debuted at the North American International Auto Show as a replacement for the Chrysler Town & Country.
  • 1.5K
  • 08 Oct 2022
Topic Review
Reggiane Re.2000
The Reggiane Re 2000 Falco I was an Italian all metal, low-wing monoplane developed and manufactured by aircraft company Reggiane. The type was used extensively by the Regia Aeronautica (Italian Air Force) and the Swedish Air Force during the first part of the Second World War. The Re 2000 was developed by a team headed by aircraft designers Roberto Longhi and Antonio Alessio to be a lightly-built and highly maneuverable interceptor/fighter aircraft. The emergent design, which had been designated as the Re 2000 Falco I, was equipped with a Curtiss-Wright-style retractable undercarriage, bore substantial similarities to the American-built Seversky P-35. On 24 May 1939, the prototype performed its maiden flight. Flight testing of the prototype revealed it to be able to outfight several significant combat aircraft of the time, including even the more modern Macchi C 200 and the German Messerschmitt Bf 109E fighters. During the run up to and following the outbreak of the Second World War, the aircraft was ordered by several nations, including the Hungarian, Swedish, United Kingdom and Italian governments. Upon entering squadron service, the Re 2000 soon proved to be a technically advanced aircraft, being well balanced and extremely aerodynamic during flight, but was not without its faults. Although the aircraft was potentially superior to Italian contemporary fighters (Fiat G 50 and Macchi C 200), the Re 2000 was not considered to be satisfactory by Italian military authorities. Consequently, the manufacturer built the type for export and almost all of the first production served with the Swedish Air Force and Hungarian Air Force , rather than in the Regia Aeronautica. The Re.2000 served as the starting point for several derivatives, including the MÁVAG Héja, Reggiane Re.2001, Re.2002, Re.2003, Re.2004, Re.2005, Re.2006 and Re.2007 combat aircraft.
  • 1.5K
  • 23 Nov 2022
Topic Review
Derailleur Gears
Derailleur gears are a variable-ratio transmission system commonly used on bicycles, consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another. Although referred to as gears in the bike world, these bicycle gears are technically sprockets since they drive or are driven by a chain, and are not driven by one another. Modern front and rear derailleurs typically consist of a moveable chain-guide that is operated remotely by a Bowden cable attached to a shifter mounted on the down tube, handlebar stem, or handlebar. When a rider operates the lever while pedalling, the change in cable tension moves the chain-guide from side to side, "derailing" the chain onto different sprockets. For more information about the choice of particular gear ratios and sprocket sizes, see Bicycle gearing.
  • 1.5K
  • 16 Nov 2022
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