A diorama is a replica of a scene, typically a three-dimensional model either full-sized or miniature. Sometimes dioramas are enclosed in a glass showcase at a museum. Dioramas are often built by hobbyists as part of related hobbies like military vehicle modeling, miniature figure modeling, or aircraft modeling.
In the United States around 1950 and onward, natural history dioramas in museums became less fashionable, leading to many being removed, dismantled, or destroyed.
An electric aircraft is an aircraft powered by electricity.Electric aircraft are seen as a way to reduce the environmental effects of aviation, providing zero emissions and quieter flights.Electricity may be supplied by a variety of methods, the most common being batteries.Most have electric motors driving propellers or turbines.
Crewed flights in an electrically powered airship go back to the 19th century, and to 1917 for a tethered helicopter.Electrically powered model aircraft have been flown at least since 1957, preceding the small unmanned aerial vehicles (UAV) or drones used today. Small UAS could be used for parcel deliveries, and larger ones for long-endurance applications: aerial imagery, surveillance, telecommunications.The first crewed free flight by an electrically powered aeroplane, the MB-E1, was made in 1973, and most crewed electric aircraft today are still only experimental prototypes. The world's first serially produced self-launching, manned electric aircraft with EASA type certification since 2006 and a patented wing-integrated battery system, the Lange E1 Antares, completed its maiden flight in 1999; since 2004, more than 100 aircraft of this type have been delivered, totalling more than 165,000 electric flight hours to date (until 2022). Between 2015 and 2016, Solar Impulse 2 completed a circumnavigation of the Earth using solar power.Electric VTOL aircraft or personal air vehicles are being considered for urban air mobility.Electric commercial airliners could lower operating costs.
The Federal Aviation Regulations (FARs) are rules prescribed by the Federal Aviation Administration (FAA) governing all aviation activities in the United States. The FARs comprise Title 14 of the Code of Federal Regulations (14 CFR). A wide variety of activities are regulated, such as aircraft design and maintenance, typical airline flights, pilot training activities, hot-air ballooning, lighter-than-air aircraft, human-made structure heights, obstruction lighting and marking, model rocket launches, commercial space operations, model aircraft operations, unmanned aircraft systems (UAS) and kite flying. The rules are designed to promote safe aviation, protecting pilots, flight attendants, passengers and the general public from unnecessary risk.
Devil's Dyke is a 100-metre (330Â ft) deep V-shaped dry valley on the South Downs in Sussex in southern England, 5 miles (8.0Â km) north-west of Brighton. It is managed by the National Trust, and is also part of the Beeding Hill to Newtimber Hill Site of Special Scientific Interest. Devil's Dyke was a major local tourist attraction in the late 19th and early 20th centuries. It is now a popular viewpoint and site for walking, model aircraft flying and hang gliding. The South Downs Way passes the site.
ArduPilot is an autopilot software program that can control multirotor drones, fixed-wing and VTOL aircraft, RC helicopters, ROVs, ground rovers, boats, submarines, uncrewed surface vessels (USVs), AntennaTrackers and blimps. It is published as open source software under the GNU GPL version 3.
ArduPilot was originally developed by hobbyists to control model aircraft and rovers and has evolved into a full-featured and reliable autopilot used by industry, research organisations, amateurs, and militaries. In June 2025 ArduPilot was used successfully by the Ukrainian armed forces during the Russo-Ukrainian War to make aerial drone attacks on Russian air bases.