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F7

'''F7''' may refer to any of several things, including in aviation, rail transport, naval vessels, automobiles, and other contexts.

Aircraft

Grumman F7F Tigercat

The Grumman F7F Tigercat was a twin-engine, low-wing monoplane fighter aircraft developed by Grumman Aircraft Engineering Corporation for the United States Navy, featuring tricycle landing gear that made it the first such carrier-based design to enter production in large quantities.^[1] Its development began in 1941 as a response to Navy requirements for a heavy fighter suited to the large Midway-class carriers, evolving from earlier Grumman prototypes like the XF5F Skyrocket, with the first prototype (XF7F-1) achieving its maiden flight on November 3, 1943.^[2] Powered by two Pratt & Whitney R-2800-34W radial engines each producing 2,100 horsepower, the aircraft had a maximum speed of approximately 435 miles per hour, a range of 1,200 miles, and a service ceiling of 40,700 feet, enabling versatile roles in fighter-bomber and night-fighting missions.^[1] Armed primarily with four 20 mm cannons mounted in the wings and four .50-caliber machine guns in the nose, the Tigercat could also carry up to two 1,000-pound bombs, one Mark 13 torpedo, or rockets under its wings, providing significant firepower for its era as a heavy fighter.^[2] Night-fighter variants, such as the F7F-1N and F7F-2N, incorporated radar systems like the APS-6 in an extended nose for improved detection capabilities, with options for single- or two-seat configurations to accommodate radar operators.^[3] Production commenced in April 1944 and continued until late 1946, resulting in a total of 364 aircraft across variants including the XF7F-1 prototypes, F7F-1 fighter-bombers, F7F-3 day fighters, and various night-fighter models like the F7F-3N and F7F-4N.^[2] Although designed for Pacific Theater operations during World War II, the Tigercat arrived too late for significant combat in that conflict, with its first carrier landing occurring on November 15, 1944, aboard the USS Shangri-La, but it saw no enemy engagements before the war's end.^[2] Post-war, it entered service with the U.S. Marine Corps for land-based operations, excelling in night-fighting and close air support roles, particularly during the Korean War where squadrons like VMF(N)-513 and VMF(N)-542 achieved confirmed kills against North Korean PO-2 biplanes.^[1] Notable for its carrier adaptability despite initial challenges with size and weight on smaller decks, the aircraft performed reconnaissance, intruder missions, and bombing runs until it was gradually retired in the early 1950s, supplanted by faster jet-powered fighters like the F3D Skyknight.^[3]

Fokker F.VII

The Fokker F.VII was a high-wing monoplane airliner developed in the Netherlands during the early 1920s, initially designed by German engineer Walter Rethel as a single-engine model capable of carrying six passengers plus two crew members.^[4]^[5] The prototype performed its maiden flight on April 11, 1924, piloted by Fokker test pilot Herman Hess from the company's airfield near Amsterdam.^[4] Powered by a 360-horsepower Rolls-Royce Eagle water-cooled inline engine (later options included the 400-horsepower Bristol Jupiter radial), the aircraft featured a fabric-covered wooden structure with a fixed tailwheel undercarriage, emphasizing reliability for commercial operations in an era of rapid aviation expansion.^[4] Five examples of the original F.VII were constructed, all acquired by KLM for short-haul routes, marking it as one of the airline's early workhorses.^[4] To address performance limitations of the single-engine layout, particularly for longer routes and heavier loads, Fokker's chief designer Reinhold Platz modified the subsequent F.VIIa variant—itself an improved single-engine iteration first flown on March 12, 1925—into the more robust trimotor F.VIIb/3m configuration.^[5]^[6] This version added two 200-horsepower Armstrong Siddeley Lynx radial engines to the nose-mounted Bristol Jupiter, enabling a greater payload of up to eight passengers and improved safety through redundancy, which became a hallmark of interwar airliners.^[5] Production of the F.VII series, including both single- and tri-engine models, exceeded 400 units by 1932, with Fokker manufacturing around 290 in the Netherlands and additional license-built examples abroad.^[7] In the United States, the design was licensed to the Atlantic Aircraft Corporation (a Fokker subsidiary) and produced as the Fokker Trimotor, with approximately 60 units assembled at Teterboro, New Jersey, for American carriers like Pan American Airways.^[8] These aircraft served primarily in passenger and airmail roles, with KLM pioneering long-distance services, including the first flight from the Netherlands to the Dutch East Indies (modern Indonesia) in late 1924 aboard a KLM F.VII registered H-NACC, which covered approximately 15,400 km (9,600 miles) in 127 flying hours over 55 days despite engine issues.^[4] The F.VII gained prominence in aviation history through high-profile exploratory flights that demonstrated its endurance. In 1927, American explorer Richard E. Byrd used a custom F.VIIb/3m named America—outfitted with extra fuel tanks and three Wright Whirlwind engines—for a transatlantic attempt from New York to Paris, departing on June 29 and ditching off the French coast after 42 hours due to fog, with Byrd and his crew rescued safely; this effort, though not a nonstop success, advanced transoceanic navigation techniques.^[9] Similarly, in 1928, Amelia Earhart flew as a passenger aboard the F.VIIb/3m Friendship—a float-equipped model owned by Amy Phipps Guest—for the first transatlantic crossing by a woman, departing Trepassey Harbor, Newfoundland, on June 17 and landing in Wales after 20 hours and 40 minutes, piloted by Wilmer Stultz and Louis Gordon.^[10] These missions highlighted the aircraft's versatility for mail delivery and record-setting endeavors across airlines worldwide. During World War II, surviving F.VIIs were adapted for military roles despite their civilian origins, primarily in reconnaissance and light bombing capacities by neutral or Allied forces. The Dutch East Indies Army Air Force operated at least one F.VIIa for maritime patrol and reconnaissance in the Pacific theater until Japanese occupation in 1942, while bomber variants like the F.VIIa/3m-M—equipped with bomb racks and defensive armament—served briefly with the Polish Air Force in exile for training and transport.^[11]^[12] A single example was also impressed into Royal Air Force service for liaison duties, underscoring the type's enduring adaptability amid wartime shortages.^[11]

Curtiss F7C Sea Hawk

The Curtiss F7C Sea Hawk was a single-engine, single-bay biplane fighter aircraft developed by the Curtiss Aeroplane and Motor Company specifically for the United States Navy as a carrier-based design in the late 1920s.^[13] The prototype, designated XF7C-1, performed its maiden flight on 28 February 1927 at the Curtiss airfield in Buffalo, New York, introducing air-cooled radial engine technology to naval fighters with its 450 horsepower Pratt & Whitney R-1340-B Wasp powerplant.^[14] This marked a departure from earlier liquid-cooled inline engines, enhancing reliability for shipboard operations, though the airframe retained fabric covering over a welded steel-tube fuselage and spruce-framed wings staggered in a single bay with N-type interplane struts.^[13] Following successful evaluations, the Navy placed an order for 17 production F7C-1 aircraft, with deliveries occurring between December 1928 and January 1929; the prototype was retroactively assigned the serial number A7653.^[14] Armed with two synchronized .30-caliber machine guns firing through the propeller arc and capable of speeds up to 151 miles per hour, the F7C-1 was intended for fighter and scout duties, with provisions for underwing bomb racks supporting its versatile naval role.^[13] A floatplane configuration was also tested on the prototype using a central float and outrigger struts, evaluating catapult launches from surface ships, though it did not enter production.^[13] Despite its carrier-capable design, the F7C-1s were not embarked on vessels like the USS Saratoga or USS Lexington and instead served exclusively with the Marine Corps' fighter squadron VF-5M (redesignated VF-9M in 1930) for land-based operations at Quantico, Virginia, and later San Diego and North Island, California.^[13]^[15] The squadron employed the aircraft for experimental testing, pilot training, and high-profile publicity demonstrations across the United States, leveraging its agile handling to showcase Marine aviation prowess.^[14] By 1932, the F7Cs were phased out in favor of more advanced monoplane fighters like the Boeing F4B, reflecting rapid technological progress in naval aviation.^[13] Limited variants included the XF7C-2, a modified F7C-1 tested in 1929 as a two-seat torpedo bomber with a lengthened fuselage and revised empennage, though it remained a prototype without further production.^[16] The type's brief service influenced subsequent carrier aircraft designs, paving the way for more robust naval fighters in the 1930s and beyond.^[13]

Locomotives

EMD F7

The EMD F7 was a 1,500-horsepower (1,100 kW) diesel-electric locomotive produced by the Electro-Motive Division (EMD) of General Motors from February 1949 to December 1953.^[17] As a successor to the earlier F3 model, it represented a refinement in EMD's F-series cab units, incorporating improved reliability and performance for the burgeoning era of dieselization on American railroads.^[18] The F7 played a pivotal role in the post-World War II transition from steam to diesel power across U.S. rail networks, enabling more efficient freight operations and contributing to the decline of steam locomotives by the mid-1950s.^[19] The locomotive featured a B-B wheel arrangement with four axles, supported by Blomberg trucks and 40-inch wheels, powered by a 16-cylinder, two-stroke 567B prime mover engine rated at 1,500 horsepower.^[17] It included dynamic braking as a standard feature, which allowed for controlled deceleration without relying solely on air brakes, enhancing safety and efficiency in heavy freight service.^[17] While primarily designed for freight, the F7's versatility extended to passenger trains, and its design directly influenced later variants such as the FP7, a passenger-specific model with an extended frame to accommodate a steam generator for heating cars.^[20] Production totaled 2,393 cab-equipped F7A units and 1,463 cabless F7B booster units, making it one of EMD's most prolific models.^[17] Several F7 locomotives have been preserved, with notable examples displayed and operated at museums. The Illinois Railway Museum holds Metra F7A No. 308, originally built in 1949 for the Chicago & North Western as No. 4083C, which remains operational for educational excursions.^[21] Other preserved units, such as those at the Tennessee Valley Railroad Museum, continue to demonstrate the F7's enduring legacy in railroading history.^[22]

Milwaukee Road class F7

The Milwaukee Road class F7 consisted of six high-speed, streamlined 4-6-4 steam locomotives built by the American Locomotive Company (ALCO) in 1938 for the Chicago, Milwaukee, St. Paul and Pacific Railroad (Milwaukee Road).^[23] These locomotives, numbered 100 through 105, were designed in collaboration with industrial designer Otto Kuhler to haul the railroad's flagship Hiawatha passenger trains, emphasizing aerodynamic efficiency and reduced weight for superior speed on the Chicago-Twin Cities route.^[23] Classified as "Baltic" type in the Milwaukee Road's nomenclature but sharing the 4-6-4 wheel arrangement typical of Hudson designs, they represented a pinnacle of 1930s steam engineering tailored for premium passenger service.^[23] Key features included Timken roller bearings on the engine truck and drivers for smoother high-speed operation, as well as ASF roller bearings on the trailing truck and tender axles to minimize friction and weight.^[23] The locomotives had 84-inch Boxpok drivers, a 300 psi boiler pressure, and 23.5 x 30-inch cylinders, generating 50,294 pounds of tractive effort while weighing 415,000 pounds on the drivers.^[23] Tenders carried 20,000 gallons of water and 25 tons of coal, with a sloped rear deck to reduce air resistance at speed, and the overall engine-and-tender weight reached 790,000 pounds.^[23] Additional innovations like 110 square feet of thermic syphons and arch tubes in the firebox, along with 12-inch piston valves and a multiple-nozzle exhaust, optimized steam flow for sustained performance.^[23] In service, the F7s powered the 700-ton Twin Cities Hiawatha consists, reducing the 412-mile Chicago to Minneapolis-St. Paul run to 6.5 hours at average speeds exceeding 70 mph, including stops.^[23] They later handled the Arrow (Chicago-Omaha) and shorter Chicago-Milwaukee routes, occasionally pulling fast freight.^[23] Renowned for velocity, the class routinely operated above 100 mph, with No. 105 achieving 112 mph near DeKalb, Illinois, on January 27, 1939, during a test run.^[23] The F7s were retired between 1949 and 1951 as the Milwaukee Road transitioned to diesel-electric power, including models like the EMD F7, ending an era of streamlined steam innovation.^[23] None were preserved, though their design influenced subsequent high-speed rail concepts.^[24]

LNER Class F7

The LNER Class F7 was a class of twelve 2-4-2T steam tank locomotives originally designed by Stephen Dewar Holden for the Great Eastern Railway (GER) as the Class Y65, intended for light passenger and branch line duties in East Anglia.^[25] These locomotives featured a compact design with 4-foot-10-inch driving wheels, a boiler pressure of 160 psi, and cylinders measuring 15 by 22 inches, producing a tractive effort of 11,607 pounds, making them suitable for hauling short trains on secondary routes.^[26] Built at the GER's Stratford Works between 1909 and 1910, they were numbered 1300–1311 under GER ownership and renumbered 8300–8311 upon transfer to the London and North Eastern Railway (LNER) following the 1923 Railways Act grouping.^[25] Initially deployed on lightweight branch lines such as those to Saffron Walden, Ramsey, and Aldeburgh, the F7s handled local passenger services, occasionally pulling up to 10-coach formations when required, and later supported push-pull operations on lines like Seven Sisters to Palace Gates and Verney Junction to Quainton Road.^[25] During World War I, several were allocated to munitions factory shuttles on the Churchbury Loop.^[26] Modifications included the addition of a second Westinghouse air pump on six locomotives (GER Nos. 1304, 1305, 1309, 1311, and LNER Nos. 8300, 8307) for auto-train working, along with variations such as pop safety valves or cast-iron chimneys on some examples; their large side-window cabs earned them the nickname "Crystal Palace Tanks."^[25] In the 1930s, three were transferred to Scotland for similar light duties, renumbered 7093 and 7094 (ex-GER 1308 and 1310).^[26] Withdrawals commenced in 1931 as branch line traffic declined, with the majority scrapped by the early 1940s, though the Scottish examples persisted until November 1948, marking the end of the class's service under British Railways ownership.^[25] None of the F7s were preserved, reflecting their modest role in early 20th-century British suburban and rural rail operations, in contrast to high-speed American designs like the Milwaukee Road class F7.^[26]

Ships

F 7 (Kriegsmarine)

The F7 was a Flottenbegleiter-class escort ship of the Kriegsmarine, a class of ten multi-purpose vessels designed in the early 1930s for fleet escort, convoy protection, anti-submarine warfare, and secondary roles such as minelaying and torpedo recovery.^[27] Ordered on 17 May 1934 and built by Blohm & Voss in Hamburg, F7 was laid down on 10 January 1935, launched on 25 May 1936, and commissioned on 15 February 1937.^[28] These ships represented the Kriegsmarine's initial efforts to develop a versatile surface fleet for operations in contested waters, emphasizing speed and armament on a compact hull despite propulsion challenges from early geared turbine designs.^[29] With a standard displacement of 1,147 tons and dimensions of 80.2 meters in length, 8.8 meters in beam, and a draft of 3.24 meters, F7 achieved a top speed of 28 knots via two geared turbines producing 14,000 shaft horsepower on two shafts, offering a range of approximately 1,700 nautical miles at 13 knots.^[28] Its armament included two 10.5 cm L/45 SK C/32 main guns for surface engagement, four 3.7 cm L/83 SK C/30 anti-aircraft guns, two 2 cm Flak guns (increased to six by 1944), and depth charge launchers with racks for anti-submarine duties, enabling flexible operations in escort flotillas.^[30] The crew numbered 117, supporting roles that extended beyond convoy defense to include mine deployment in defensive barriers.^[28] Following commissioning, F7 joined the 2nd Escort Flotilla for training and initial patrols, transitioning to active service in the Baltic Sea after the outbreak of World War II in September 1939, where it conducted convoy escorts and minelaying operations to secure German supply lines.^[31] By 6 September 1939, it had been redeployed to Helgoland in the North Sea for similar protective duties amid intensifying Allied threats.^[28] From April 1940 to June 1944, F7 served as a torpedo recovery vessel with the 25th U-boat Flotilla, retrieving expended ordnance to support submarine training and operations in the Baltic and adjacent waters; it then transferred to the 7th Minesweeping Flotilla for the remainder of the war.^[31] Commanded by a succession of Kriegsmarine officers during its service, F7 exemplified the class's adaptation to evolving wartime needs in the Kriegsmarine's surface forces.^[32] F7 survived the European theater's end but was seized by Soviet forces on 5 November 1945 at Swinemünde as a war prize, later renamed Buran on 25 February 1945 and incorporated into the Soviet Northern Baltic Fleet for experimental and depot roles before being redesignated Dubna in 1951 and ultimately scrapped between 1957 and 1958.^[28]

HMAS Yarra (F07)

HMAS Yarra (F07), the third Royal Australian Navy vessel to bear the name after the Yarra River, was a River-class destroyer escort designed for anti-submarine warfare during the Cold War era.^[33] She was laid down on 9 April 1957 at the Williamstown Naval Dockyard in Melbourne and launched on 30 September 1958 by Lady McBride, wife of the Minister for Defence.^[33] The ship was commissioned on 27 July 1961 under the command of Commander James Merson, marking her as the lead ship of her class built in Australia as modified Type 12 frigates, later redesignated destroyer escorts by the RAN.^[33] With a standard displacement of 2,200 tons and a crew of 250, Yarra measured 112.8 meters in length and achieved a top speed of 30 knots powered by steam turbines.^[34] Initially armed for anti-submarine roles, Yarra featured a twin 4.5-inch Mark 6 gun turret forward, a twin 40 mm Bofors anti-aircraft mount, and two triple-barreled Squid mortars aft for depth charge projection, supplemented by two Limbo anti-submarine mortars added during early refits.^[34] Throughout her service, she underwent significant modernizations, including the installation of the Seacat anti-aircraft missile system in 1964–1965 and the Ikara anti-submarine missile system during a major refit from 1966 to 1967, which enhanced her capabilities against submerged threats.^[33] Further upgrades in the 1970s included the Mulloka sonar suite in 1974–1975 and the removal of one Limbo mortar and the Bofors gun to accommodate new equipment, reflecting evolving naval tactics amid regional tensions.^[35] These enhancements allowed Yarra to transition from conventional escort duties to more advanced missile-guided operations over her career.^[33] Yarra's operational service focused on the Asia-Pacific region, including multiple deployments to the Far East Strategic Reserve from 1962 to 1973, where she participated in SEATO exercises such as Sea Imp and provided escorts for allied forces.^[33] During the Vietnam War, she conducted escort duties for the troop transport HMAS Sydney to Vung Tau in 1965 and supported anti-infiltration patrols in Southeast Asian waters, contributing to RAN commitments without direct combat engagements.^[33] Later deployments included RIMPAC exercises in 1971, 1980, and 1982, as well as port visits to New Zealand and Pacific nations, amassing over 714,000 nautical miles in 24 years of active duty.^[35] After her final refit, Yarra was decommissioned on 22 November 1985 at Fleet Base East in Sydney, having served as a cornerstone of RAN anti-submarine capabilities.^[33] She was placed in reserve until sold for scrapping in 1991 and broken up in 1992, ending the lineage of Yarra-named warships that began with a World War I destroyer.^[35]

Automobiles

DKW F7

The DKW F7 was a subcompact front-wheel-drive automobile produced by Auto Union's DKW division from 1937 to 1938, serving as the direct successor to the earlier F5 model. It featured a lightweight sheet-metal body constructed over a central backbone chassis, available in configurations such as sedans, cabriolets, and light commercial variants like delivery vans, making it suitable for both family use and utilitarian purposes. The design emphasized affordability and practicality, with production totaling approximately 80,000 units before the onset of World War II shifted manufacturing priorities toward military needs.^[36] Central to the F7's engineering was its two-stroke twin-cylinder engine, displacing 692 cc and producing 20 horsepower, which provided adequate performance for urban and light-duty applications with a top speed of around 85 km/h. The powerplant was transversely mounted to facilitate the front-wheel-drive layout, a hallmark of DKW's innovative approach that dated back to the 1930s. Suspension was notably advanced for the era, incorporating all-round independent setup with transverse leaf springs at the front and torsion bars at the rear, contributing to improved ride quality and handling compared to contemporary rear-drive competitors. A three-speed manual transmission routed power to the front wheels, enhancing the car's efficiency in everyday scenarios.^[36]^[37] Priced at approximately 2,200 Reichsmarks for base sedan models—comparable to other economy cars of the time—the F7 targeted budget-conscious buyers in pre-war Germany, where it competed effectively in the subcompact segment. Its simple construction and low operating costs, bolstered by the two-stroke engine's minimal maintenance needs, appealed to a broad market, though production ceased in 1939 as Auto Union redirected resources to wartime efforts. The F7 exemplified DKW's pioneering role in two-stroke engine technology and front-wheel drive, influencing the brand's post-war lineup, including models like the F89 that resumed civilian production under Soviet occupation before evolving into the iconic Auto Union 1000 series.^[38]

Haval F7

The Haval F7 is a compact crossover SUV manufactured by the Haval brand of Great Wall Motors since its launch in November 2018. Designed for urban driving with premium features, it targets buyers seeking a versatile vehicle blending style, technology, and performance. The model is built on Great Wall's modular Lemon platform, emphasizing efficiency and adaptability for both city and light off-road use.^[39] Powertrain options include a 1.5-liter turbocharged inline-four engine producing 169 horsepower and 285 Nm of torque, or a more potent 2.0-liter turbocharged unit delivering up to 224 horsepower and 385 Nm of torque. These engines pair exclusively with a seven-speed dual-clutch automatic transmission (DCT), available in front-wheel-drive (FWD) or all-wheel-drive (AWD) configurations for enhanced traction. The F7 incorporates advanced features such as L2-level driver assistance systems, including adaptive cruise control, lane-keeping assist, and automated emergency braking, alongside a panoramic sunroof and a ground clearance of 190 mm for improved approach to urban obstacles.^[40]^[41]^[42]^[43]^[44]^[45] In 2020, the F7 received a facelift featuring updated exterior styling with revised front and rear fascias for a more aggressive look, along with interior enhancements like softer materials and improved infotainment interfaces. Positioned as an urban premium SUV, it offers leather-trimmed seats, a multi-function touchscreen system, and connectivity options to appeal to tech-savvy consumers. Annual sales in China have exceeded 100,000 units, with 140,770 recorded in 2019 alone, reflecting strong domestic demand. The model has been exported to markets including Russia, Kazakhstan, Azerbaijan, and several Eastern European countries, supporting Haval's global expansion.^[46]^[47]^[48]^[49]

Haima F7

The Haima F7, also known as the Haima Family F7, is a compact multi-purpose vehicle (MPV) manufactured by the Chinese automaker Haima Automobile primarily for the domestic market. Introduced in 2017, it targets young families seeking affordable and versatile transportation, with a modular interior design that allows for easy reconfiguration of space. The vehicle is built on a platform shared with Haima's Familia series, emphasizing practicality over luxury in the competitive entry-level MPV segment.^[50]^[51] Powering the F7 is a 1.5-liter turbocharged inline-four engine producing 165 horsepower and 220 Nm of torque, paired with either a 6-speed manual or 6-speed automatic transmission for front-wheel drive. It accommodates 5 to 7 passengers across three rows, with the second row featuring sliding adjustments to balance cargo and legroom needs. This setup provides up to 4,750 mm in length, making it suitable for urban family use while maintaining a compact footprint.^[52]^[53]^[50] Standard features across trims include a multi-function touchscreen infotainment system, rear parking sensors, and basic safety equipment like dual front airbags, with higher variants adding a 360-degree camera and adaptive cruise control for improved driver assistance. Priced between 79,800 and 119,800 yuan in China at launch, it positioned itself as an economical option under 100,000 yuan for base models.^[51]^[50] The F7's development occurred following the decline of Haima's long-term partnership with Mazda, which originated as a joint venture in 1992 but transitioned to technical cooperation by 2006 and fully ended by 2009, pushing Haima toward independent engineering. Unlike SUVs such as the Haval F7, the Haima F7 prioritizes MPV-style interior flexibility for passenger comfort over off-road capability.^[54]

Falcon F7

The Falcon F7 is a limited-production mid-engine sports car manufactured by the U.S.-based Falcon Motorsports from 2012 to 2017. Founded in 2009 by automotive engineer Jeff Lemke in Michigan, the company aimed to create a hand-built American supercar blending exotic styling with domestic engineering. Only seven units were produced, each highly customizable to owner specifications, emphasizing exclusivity in the supercar segment.^[55]^[56] The F7 features a Chevrolet LS3 V8 engine producing 430 horsepower, mounted in a lightweight carbon fiber-aluminum monocoque chassis weighing approximately 2,785 pounds. Power is delivered to the rear wheels via a six-speed manual transaxle, enabling acceleration from 0 to 60 mph in 3.5 seconds and a top speed of 190 mph. This rear-wheel-drive layout, combined with adjustable suspension, positions the F7 for both street driving and track use, though higher-output twin-turbo variants using the LS7 engine were also offered for enhanced performance.^[57]^[58]^[59] The car debuted as a concept at the 2011 Detroit Auto Show, with production examples following in 2012, priced around $300,000. Its aerodynamic design draws inspiration from iconic supercars like the Ferrari 288 GTO and Lamborghini models, featuring a removable targa roof and premium leather interior. Post-2017, Falcon Motorsports ceased F7 production amid financial challenges, leaving the model a rare collector's item often appearing at auctions and enthusiast events; this contrasts with mass-market vehicles like the Haima F7.^[60]^[61]^[58]

SAIC Rising F7

The SAIC Rising F7 is a battery electric executive sedan developed and launched by SAIC Motor under its Rising Auto premium electric vehicle brand in March 2023.^[62] Measuring 5,000 mm in length with a 3,000 mm wheelbase, it features a rear-wheel-drive configuration in its base models, powered by a single electric motor producing 250 kW.^[63] The vehicle offers battery options including a 90 kWh ternary lithium-ion pack, delivering a CLTC-estimated range of 666 km, emphasizing efficiency and zero-emission performance on SAIC's dedicated new energy vehicle (NEV) architecture that supports battery swapping for enhanced usability.^[64] A dual-motor all-wheel-drive variant boosts output to 400 kW, achieving 0-100 km/h acceleration in 3.7 seconds, positioning the F7 as a high-performance option in the mid-to-large sedan segment.^[65] Inside, the F7 incorporates the Rising OS smart cockpit system, powered by a Qualcomm Snapdragon 8155 chip and featuring a 43-inch integrated triple-screen setup for immersive user interaction, including a 15.05-inch central display and 10.25-inch instrument panel.^[64] Advanced driver assistance includes the Rising Pilot system with L2+ autonomy, supported by 32 sensors such as LiDAR from RoboSense for enhanced perception and safety features like adaptive cruise control and lane-keeping.^[66] Priced starting at 209,900 yuan (approximately 30,500 USD), it targets China's premium EV market with a focus on luxury and technology integration.^[67] Built on SAIC's scalable NEV platform, the F7 received over-the-air (OTA) software updates in 2024, enhancing its AI-driven features and user experience through optimizations to the infotainment and autonomy systems.^[68] By late 2025, the model continued to see adoption in China's competitive electric sedan market, with monthly sales reflecting steady demand despite broader challenges in the premium EV sector.^[69]

Other uses

F7 (wheelchair classification)

The F7 classification, also known as SP7 or historically "Lower 5", was a wheelchair sports category used by the International Paralympic Committee (IPC) for athletes with spinal cord injuries at the S1-S2 neurological level, characterized by significant impairment in lower limb function but with partial trunk control allowing limited stability and propulsion in a wheelchair. This classification focused on functional abilities rather than the specific cause of impairment, grouping athletes who could maintain balance through hip and core muscles while experiencing reduced leg strength and sensation below the sacral level. It ensured equitable competition by matching athletes with similar activity limitations, particularly in seated or wheelchair-based events where trunk stability influences performance.^[70] Athletes classified as F7 historically competed in multiple Paralympic disciplines, including wheelchair basketball where functional profiles similar to F7 often aligned with 4-point player ratings due to upper body strength and partial trunk rotation for passing and shooting; wheelchair rugby, where comparable impairments corresponded to classifications around 2.5-3.0 points enabling play involving tackling; and athletics field events such as discus throw, where they used a seated position and kept at least one foot grounded during throws. These adaptations highlighted how F7 emphasized observable functional impacts, like generating force from the upper body while compensating for lower limb deficits.^[71]^[72] The F7 system evolved from the earlier medical-based "Lower 5" designation used in the mid-20th century, which categorized spinal cord injuries by lesion level (including S1-S2) across all sports to promote fair grouping based on impairment severity. This shifted to a functional model in the 1980s under IPC standards, prioritizing sport-specific assessments to minimize advantages from non-impaired functions and fostering balanced competitions. F7 athletes were integral to Paralympic history since the 1960s, with early participants in Rome 1960 in events like wheelchair shot put and javelin, contributing to inclusive para-sports growth.^[73] In modern classifications as of 2025, athletes with impairments similar to the former F7 (e.g., complete paraplegia with good trunk control and no leg function) compete in World Para Athletics classes F55-F57 for seated field events, or equivalent functional classes in other sports like 4.0 in wheelchair basketball and 2.5-3.0 in wheelchair rugby, per the updated IPC Athlete Classification Code.^[74]^[75]

F7 key (computing)

The F7 key is the seventh function key in the standard row of 12 function keys (F1–F12) located at the top of most computer keyboards. It originated with the IBM Model F keyboard, introduced in 1981 alongside the IBM PC 5150, where the initial set of 10 function keys was arranged vertically on the left side of the keyboard to support application-specific commands in early personal computing environments.^[76] This layout evolved with the 1984 IBM PC/AT, standardizing 12 function keys horizontally across the top, a design that became ubiquitous in PC-compatible keyboards and influenced modern layouts.^[77] In productivity software, the F7 key commonly triggers proofreading tools. For example, in Microsoft Word and other Office applications like Excel and Outlook, pressing F7 opens the Editor pane to scan the document for spelling, grammar, and style issues, streamlining document review processes.^[78] In web browsers, F7 serves accessibility functions; in Mozilla Firefox, it toggles caret browsing mode, enabling keyboard-based navigation and text selection on webpages for users who prefer or require non-mouse interaction.^[79] Within integrated development environments (IDEs), its role supports debugging workflows—in JetBrains IntelliJ IDEA, F7 steps into a function or method during execution to inspect code flow, while in Microsoft Visual Studio, it toggles between code and designer views.^[80]^[81] The F7 key's behavior is highly customizable through operating system utilities and software, allowing reassignment to personal macros or shortcuts. On Windows, Microsoft PowerToys Keyboard Manager permits remapping F7 to alternative keys or complex actions, enhancing productivity for repetitive tasks.^[82] macOS offers built-in modifier key adjustments via System Settings, with advanced remapping of function keys like F7 available through open-source tools such as Karabiner-Elements. In video games, F7 is frequently programmed for quick-access functions, such as activating macros for inventory management or ability triggers, reducing reliance on complex key combinations during gameplay.^[83] Laptop keyboards often feature compact variations where F7 integrates secondary hardware controls activated via the Fn key, such as increasing keyboard backlight brightness or toggling external displays, to conserve space in portable designs.^[84] These adaptations can sometimes require Fn lock toggles to prioritize standard F7 functions over multimedia defaults. For accessibility, operating systems and tools support remapping F7 to suit users with physical limitations, such as remapping to easier-to-reach keys or voice-activated alternatives, ensuring broader usability in computing tasks.^[82]

F7 (musical chord)

The F7 chord, a dominant seventh chord, consists of the notes F (root), A (major third), C (perfect fifth), and E-flat (minor seventh).^[85] This structure forms a major triad with an added minor seventh interval, creating a characteristic dissonant sound that is foundational in Western music theory.^[86] In the key of B-flat major, F7 functions as the V7 chord, built on the dominant scale degree, and typically resolves to the tonic B-flat major chord through voice leading where the third (A) moves to the tonic root (B-flat) and the seventh (E-flat) resolves downward to the third (D).^[86] The F7 chord plays a pivotal theoretical role in Western harmony by generating tension through its tritone interval between the third (A) and seventh (E-flat), which seeks resolution to the tonic, establishing a sense of pull and release essential to cadences and progressions.^[87] This tension-resolution dynamic is particularly prominent in the perfect cadence (V7-I), driving harmonic motion in classical, popular, and contemporary music.^[88] F7 is symbolized simply as "F7" in lead sheets and chord charts, distinguishing it from major seventh (Fmaj7) or minor seventh (Fm7) variants. It appears frequently in jazz, blues, and rock genres, often as part of 12-bar blues progressions in the key of F, where it serves as the I7 chord.^[89] On guitar, a common voicing is the barre chord at the first fret, with the index finger barring strings 1-6, the ring finger on the third fret of the A string (C), the pinky on the third fret of the D string (E-flat), and the middle finger on the second fret of the G string (A).^[90] Piano voicings include root position (F-A-C-E-flat) or inversions such as second inversion (C-E-flat-F-A) for smoother transitions.^[85] For instance, in the rock song "Hey Jude" by The Beatles, F7 appears in the bridge to heighten emotional intensity before resolving.^[91]

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