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Topic Review

The Heinkel He 70 was a mail plane and fast passenger aircraft of the 1930s designed by Germany aeronautics firm Heinkel Flugzeugwerke, which was also used in auxiliary bomber and aerial reconnaissance roles. It had a relatively brief commercial career before it was replaced by types which could carry more passengers. The He 70 was a leading design for its day, setting eight world speed records by the beginning of 1933.

2.7K
21 Oct 2022

Topic Review

Electric Vehicle Charging Systems

The high-voltage battery is a crucial element for electric vehicles (EVs) traction systems. It is the primary energy source that must be regularly recharged to reach the autonomy declared by the manufacturer. Therefore, an EV charging system is required to ensure the battery charging process.

2.7K
27 Feb 2023

Topic Review

Chrysler Town & Country

The Chrysler Town & Country is a minivan that was manufactured and marketed by Chrysler. It was introduced in 1989 for the 1990 model year. The Chrysler group minivans, which include the Dodge Caravan/Dodge Grand Caravan and included the Plymouth Voyager/Plymouth Grand Voyager/Chrysler Voyager, have ranked as the 13th bestselling automotive nameplates worldwide, with over 12 million sold. After five generations and 27 model year runs, the Town & Country nameplate was retired at the end of the 2016 model year run and was replaced by the 2017 model-year Chrysler Pacifica.

2.7K
19 Oct 2022

Topic Review

Earth Sheltering

Earth sheltering is the architectural practice of using earth against building walls for external thermal mass, to reduce heat loss, and to easily maintain a steady indoor air temperature. Earth sheltering has become relatively more popular in modern times, especially among environmentalists and advocates of passive solar and sustainable architecture. However, the practice has been around for nearly as long as humans have been constructing their own shelters.

2.6K
27 Oct 2022

Topic Review

Road Policing Unit

A road policing unit (RPU) is the motorway and trunk-road police unit of a British police force. Most territorial police forces established traffic departments in the early 1950s, although the first was established by the Metropolitan Police Service in 1919, but it was with the opening of the M1 motorway in November 1959 that the need for the police to have a specialist department dedicated to policing the new roads was recognised. The 1960s saw the start of construction of new motorways, so the traffic departments grew. One of the first fatal accidents on the M1 occurred near Newport Pagnell, Buckinghamshire in December 1959.

2.6K
30 Sep 2022

Topic Review

Waka (Māori: [ˈwaka]) are Māori watercraft, usually canoes ranging in size from small, unornamented canoes (waka tīwai) used for fishing and river travel to large, decorated war canoes (waka taua) up to 40 metres (130 ft) long. The earliest remains of a canoe in New Zealand were found near the Anaweka estuary in a remote part of the Tasman District and radiocarbon-dated to about 1400. The canoe was constructed in New Zealand, but was a sophisticated canoe, compatible with the style of other Polynesian voyaging canoes at that time. Since the 1970s about eight large double-hulled canoes of about 20 metres have been constructed for oceanic voyaging to other parts of the Pacific. They are made of a blend of modern and traditional materials, incorporating features from ancient Melanesia, as well as Polynesia.

2.6K
13 Oct 2022

Topic Review

Hamburger Flugzeugbau HFB 320 Hansa Jet

The HFB 320 Hansa Jet is a twin-engine, ten-seat business jet that was designed and produced by Germany aircraft manufacturer Hamburger Flugzeugbau between 1964 and 1973. The most recognisable and unconventional feature of the aircraft is its forward-swept wing. The Hansa Jet begun development during the 1960s, the selection of the forward-swept wing can be largely attributed to head engineer Hans Wocke, who had previously worked on the experimental Junkers Ju 287. It possessed a spacious cabin, which was achieved due to its wing design, but was a relatively heavy aircraft, posing some issues during both take-off and landing. On 21 April 1964, the prototype conducted its maiden flight. On 12 May 1965, the first prototype was lost during a test flight, killing Hamburger Flugzeugbau's chief test pilot; several design changes were made to change the Hansa Jet's stall characteristics. Type certification of the Hansa Jet was received during early 1967 and the first deliveries commenced during the following year. The largest customer of the type was the German Air Force , who tasked it with both training and VIP transport duties. During 1973, it was decided to end production of the Hansa Jet. Reasons for the programme's termination include increased competition from newer executive jets, a decline in the value of the US dollar, and the limited sales of the type. The German Air Force continued to operate their Hansa Jets into the early 1990s. A limited number continued to be used amongst civilian operators into the 21st century.

2.6K
27 Oct 2022

Topic Review

Lunar Orbital Platform – Gateway

The Lunar Orbital Platform – Gateway (LOP-G) is a future space station in lunar orbit intended to serve as a solar-powered communications hub, science laboratory, short-term habitation module, and holding area for rovers and other robots. While the project is led by NASA, the Gateway is meant to be developed, serviced, and utilized in collaboration with commercial and international partners. It will serve as the staging point for robotic and crewed exploration of the lunar south pole, and is the proposed staging point for NASA's Deep Space Transport concept. The science disciplines to be studied on the Gateway are expected to include planetary science, astrophysics, Earth observations, heliophysics, fundamental space biology, and human health and performance. Under current plans, this scientific activity will start after the first crewed landing (Artemis 3). Gateway development includes all of the International Space Station partners: ESA, NASA, Roscosmos, JAXA, and CSA. Construction is planned to take place in the 2020s. The International Space Exploration Coordination Group (ISECG), which is composed of 14 space agencies including NASA, has concluded that LOP-G will be critical in expanding a human presence to the Moon, Mars, and deeper into the Solar System. Formerly known as the Deep Space Gateway, the station was renamed in NASA's 2018 proposal for the 2019 United States federal budget. When the budgeting process was complete, US$450 million had been committed by Congress to preliminary studies.

2.6K
26 Oct 2022

Topic Review

Grasshopper (Rocket)

Grasshopper and the Falcon 9 Reusable Development Vehicles (F9R Dev) were experimental flight test reusable rockets that performed vertical takeoffs and landings. The project was privately funded by SpaceX, with no funds provided by any government until later on. Two prototypes were built, and both were launched from the ground. Grasshopper was announced in 2011 and began low-altitude, low-velocity hover/landing testing in 2012. The initial Grasshopper test vehicle was 106 ft (32 m) tall and made eight successful test flights in 2012 and 2013 before being retired. A second Grasshopper-class prototype was the larger and more capable Falcon 9 Reusable Development Vehicle (F9R Dev, also known as F9R Dev1) based on the Falcon 9 v1.1 launch vehicle. It was tested at higher altitudes and was capable of much higher velocity but was never tested at high velocity. The F9R Dev1 vehicle was built in 2013–2014 and made its first low-altitude flight test on 17 April 2014; it was lost during a three-engine test at the McGregor test site on 22 August 2014, which ended the low-velocity test program. Further expansion of the flight test envelope for the reusable rocket was moved to descending Falcon 9 boosters that had been used on orbital flight trajectories on commercial orbital flights of the Falcon 9. The Grasshopper and F9R Dev tests were fundamental to the development of the reusable Falcon 9 and Falcon Heavy rockets, which require vertical landings of the near-empty Falcon 9 and Falcon Heavy first-stage booster tanks and engine assemblies. The Grasshopper and the F9R Dev tests led into a series of high-altitude, high-speed controlled-descent tests of post-mission (spent) Falcon 9 booster stages that accompanied the commercial Falcon 9 missions since September 2013. The latter eventually resulted in the first successful booster landing on 21 December 2015.

2.6K
16 Nov 2022

Topic Review

Aircraft noise is noise pollution produced by aircraft during the various phases of a flight. Sound production is divided into three categories: Health consequences include sleep disturbance, hearing impairment and heart disease, as well as workplace accidents caused by stress. Memory and recall can also be affected. Governments have enacted extensive controls that apply to aircraft designers, manufacturers, and operators, resulting in improved procedures and cuts in pollution.

2.6K
26 Oct 2022

Topic Review

Motor Torpedo Boat

User:RMCD bot/subject notice Motor Torpedo Boat (MTB) was the name given to fast torpedo boats by the Royal Navy and the Royal Canadian Navy. The 'motor' in the formal designation, referring to the use of petrol engines, was to distinguish them from the majority of other naval craft that used steam turbines or reciprocating steam engines. The capitalised term is generally used for the Royal Navy (RN) boats and abbreviated to "MTB". During the Second World War, the US Navy built such craft, identified by the hull classification symbol "PT", for "Patrol, Torpedo". German motor torpedo boats of the Second World War were called S-boote (Schnellboote, "fast boats") by the Kriegsmarine and "E-boats" by the Allies. Italian MTBs of this period were known as Motoscafo Armato Silurante ("MAS boats", torpedo armed motorboats). French MTBs were known as vedettes lance torpilles ("torpedo-launching fast boats"). Soviet MTBs were known as торпедные катеры (torpyedniye katyery; "torpedo cutters", often abbreviated as TKA). Romanian MTBs were known as vedete torpiloare ("torpedo fast boats"). After the end of the War in 1945, a number of the Royal Navy's MTBs were stripped and the empty hulls sold for use as houseboats.

2.6K
28 Oct 2022

Topic Review

Plasan Sand Cat

The SandCat (Hebrew: פלסן קרקל‎) is a composite armored vehicle designed by the then Plasan Sasa (now Plasan) of Israel. The SandCat, which is presented as a single bi-capitalized word, was shown publicly for the first time at AUSA during October 2005. The latest models were shown for the first time at Eurosatory 2018. The SandCat is based on a commercial Ford F-Series chassis. Approximately 700 SandCats have been produced since 2004, and while Plasan has never released complete details, these are known to be in service with at least 16 users across five continents, and in a wide variety of roles that range from Police/internal security to combat/patrol.

2.6K
15 Nov 2022

Topic Review

Plug-in Electric Vehicles in Sweden

The adoption of plug-in electric vehicles in Sweden is actively supported by the Government of the Kingdom of Sweden. (As of December 2020), a total of 217,704 light-duty plug-in electric vehicles have been registered since 2011, consisting of 148,889 plug-in hybrids, 62,870 all-electric cars, and 5,945 fully electric commercial vans. Sweden has ranked among the world's top ten best-selling plug-in markets since 2015, listed through 2019 as the ninth largest country market. (As of December 2019), the Swedish stock of plug-in passenger cars listed as the sixth largest in Europe. The Swedish plug-in electric market is dominated by plug-in hybrids, representing 75.1% of the Swedish light-duty plug-in electric vehicle registrations through 2018, but began to slightly decline afterwards, reaching 70.3% in 2020. The market share of plug-in electric vehicles climbed from 0.57% in 2013 to 1.53% of new car sales in the country in 2014. The segment market share reached 2.5% in 2015, rose to 5.2% in 2017, 11.3% in 2019, and achieved a record of 32.2% in 2020.

2.6K
05 Nov 2022

Topic Review

Instrument Mechanic

Instrument mechanics in engineering are tradesmen who specialize in installing, troubleshooting, and repairing instrumentation, automation and control systems. The term "Instrument Mechanic" came about because it was a combination of light mechanical and specialised instrumentation skills. The term is still is used in certain industries; predominantly in industrial process control.

2.6K
24 Oct 2022

Topic Review

Leadership in Energy and Environmental Design

Leadership in Energy and Environmental Design (LEED) is a green building certification program used worldwide. Developed by the non-profit U.S. Green Building Council (USGBC), it includes a set of rating systems for the design, construction, operation, and maintenance of green buildings, homes, and neighborhoods, which aims to help building owners and operators be environmentally responsible and use resources efficiently. By 2015, there were over 80,000 LEED-certified buildings and over 100,000 LEED-accredited professionals. Most LEED-certified buildings are located in major U.S. metropolises. LEED Canada has developed a separate rating system for the regulations and climate of that country. Some U.S. federal agencies, state and local governments require or reward LEED certification. This can include tax credits, zoning allowances, reduced fees, and expedited permitting. Studies have found that for-rent LEED office spaces generally have higher rents and occupancy rates and lower capitalization rates. LEED is a design tool rather than a performance-measurement tool and focuses on energy modeling rather than actual energy consumption. It lacks climate specificity, and has been criticized for a point system that can encourage inappropriate design choices and make energy conservation the weakest part of the evaluation. It has also been criticized for the phenomenon of "LEED brain" in which the public relations value of LEED certification drives the development of buildings.

2.5K
30 Oct 2022

Topic Review

Lugnut (Transformers)

Lugnut is the name of several fictional characters from the Transformers universe. Both are Decepticon jets who are loyal to Megatron.

2.5K
18 Nov 2022

Topic Review

GMC CCKW 2½-ton 6X6 Truck

The GMC CCKW, also known as "Jimmy", or the G-508 by its Ordnance Supply Catalog nr, was a highly successful series of off-road capable, 21⁄2-ton, 6x6 trucks, built in large numbers to a standardized design (from 1941 to 1945) for the U.S. Army, that saw heavy service, predominantly as cargo trucks, in both World War II and the Korean War. The original "Deuce and a Half", it formed the backbone of the famed Red Ball Express that kept Allied armies supplied as they pushed eastward after the Normandy invasion. The CCKW came in many variants, including open or closed cab, long wheelbase (LWB) CCKW-353 and short (SWB) CCKW-352, and over a score of specialized models, but the bulk were standard, general purpose, cargo models. A large minority were built with a front mounted winch, and one in four of the cabs had a machine-gun mounting ring above the co-driver's position. Of the almost 2.4 million trucks that the U.S. Army bought between 1939 and December 1945, across all payload weight classes, some 812,000, or just over one third, were 2 1⁄2-ton trucks. GMC's total production of the CCKW and its variants, including the 21⁄2-ton, 6x6, amphibian DUKW, and the 6x4, 5-ton (on-road) CCW-353, amounted to some 572,500 units – almost a quarter of the total WW II U.S. truck production, and 70 percent of the total 2 1⁄2-ton trucks. GMC's total of ~550,000 purely 6x6 models, including the DUKW, formed the overwhelming majority of the ~675,000 six by six 2 1⁄2-ton trucks, and came in less than 100,000 shy of the almost 650,000 World War II jeeps. Additionally, GM built over 150,000 units of the CCKW's smaller brother, the 1 1⁄2-ton, 4x4 Chevrolet G506, at the same factory. The GMC CCKW began to be phased out, once the M35 series trucks were first deployed in the 1950s, but remained in active U.S. service until the mid-1960s. Eventually, the M35 series, originally developed by REO Motors, succeeded the CCKW as the U.S. Army's standard 2 1⁄2-ton, 6x6 cargo truck.

2.5K
22 Nov 2022

Topic Review

Mitsubishi Regional Jet

The Mitsubishi Regional Jet (Japanese: 三菱リージョナルジェット), or MRJ for short, is a twin-engine regional jet aircraft seating 70–90 passengers manufactured by Mitsubishi Aircraft Corporation, a partnership between majority owner Mitsubishi Heavy Industries and minority owner Toyota Motor Corporation with design assistance from Subaru Corporation, itself already an aerospace manufacturer. The MRJ will be the first airliner designed and produced in Japan since the NAMC YS-11 of the 1960s, which was produced at a loss. The first flight of the MRJ was in November 2015. After several delays, deliveries are now scheduled to start by mid-2020.

2.5K
21 Nov 2022

Topic Review

Rigid-Hulled Inflatable Boat

A rigid-hulled inflatable boat (RHIB) or rigid-inflatable boat (RIB) is a lightweight but high-performance and high-capacity boat constructed with a solid, shaped hull and flexible tubes at the gunwale. The design is stable and seaworthy. The inflatable collar allows the vessel to maintain buoyancy if a large quantity of water is shipped aboard due to bad sea conditions. The RIB is a development of the inflatable boat. Uses include work boats (supporting shore facilities or larger ships) in trades that operate on the water, military craft, where they are used in patrol roles and to transport troops between vessels or ashore, and lifeboats.

2.5K
10 Nov 2022

Topic Review

Cockpit Management and Data system - COMAND for short - acts as a combined command and control centre for all audio, telematics and telecommunications functions on Mercedes-Benz vehicles and includes a dedicated flat display screen. In addition to the GPS navigation system and general processing and control logic, COMAND includes components such as an address book, telephone, radio and in many cases a CD/DVD drive. It is connected to other (often separate) devices such as CD/DVD changers, sound system and surround sound amplifier, TV receiver and the optional Linguatronic voice control system via an optical fibre network. The first generations of COMAND used the D2B optical network standard whereas later models are based on MOST. A key feature of all COMAND systems is to provide deep integration between the various functions such as multimedia, navigation and telephony and to also allow multiple presentation and control facilities. An example of functional integration is where other audio sources can be muted when a phone call comes in or when navigation guidance is being given. It is also the case that the main audio system, speakers and microphone are used for all these functions instead of being logically and functionally separate. With regard to multiple presentation and control facilities, COMAND based vehicles allow steering wheel controls to be used alongside the main COMAND buttons and controller and COMAND related status information and instructions can be displayed in the instrument cluster in addition to the main COMAND display. On vehicles with a factory fitted Mercedes-Benz rear seat entertainment system, this also provides integration with the COMAND system, allowing for instance the rear seat displays to show content from the COMAND TV receiver or to play out the rear DVD audio over the car's surround sound system. On newer S-Class and CL-Class models such as the W221, the integration between COMAND and other vehicle functions is even more complete, including access via COMAND to the HVAC system, seat controls, etc. On these cars, in contrast to most other Mercedes-Benz vehicles, COMAND is part of the standard specification rather than an optional extra. COMAND was introduced first exclusively on the flagship S-Class and CL-Class models. Later, it became available on other Mercedes cars too.

2.5K
09 Oct 2022

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