Τρίτη 28 Φεβρουαρίου 2017

Sukhoi SU-35S Multi-Role Fighter - Russian Flying Bear




The Sukhoi Su-35 (Russian: Сухой Су-35; NATO reporting name: Flanker-E[N 1]) is a designation for two separate, heavily upgraded derivatives of the Su-27 'Flanker' jet plane. They are single-seat, twin-engine, supermaneuverable multirole fighters, designed by Sukhoi and built by Komsomolsk-on-Amur Aircraft Production Association (KnAAPO).

The first variant was designed during the 1980s, when Sukhoi sought to upgrade its high-performance Su-27, and was initially known as the Su-27M. Later re-designated Su-35, this derivative incorporated aerodynamic refinements with increased manoeuvrability, enhanced avionics, longer range, and more powerful engines. The first Su-35 prototype, converted from a Su-27, made its maiden flight in June 1988. More than a dozen of these were built, some of which were used by the Russian Knights aerobatic demonstration team. The first Su-35 design was later modified into the Su-37, which possessed thrust vectoring engines and was used as a technology demonstrator. A sole Su-35UB two-seat trainer was built in the late 1990s that strongly resembled the Su-30MK family.

In 2003, Sukhoi embarked on a second modernization of the Su-27 to produce what the company calls a 4++ generation fighter that would bridge the gap between legacy fighters and the upcoming fifth-generation Sukhoi PAK FA. This derivative, while omitting the canards and air brake, incorporates a reinforced airframe, improved avionics and radar, thrust-vectoring engines, and a reduced frontal radar signature. In 2008 the revamped variant, erroneously named the Su-35BM in the media, began its flight test programme that would involve four prototypes, one of which was lost in 2009.

The Russian Air Force has ordered 98 production units, designated Su-35S, of the newly revamped Su-35.[ Both Su-35 models were marketed to many countries, including Brazil, China, India, Indonesia, and South Korea; only China has so far ordered the Su-35, placing an order for 24 in late 2015. Indonesia expressed an intent to buy between 8-10 Su-35s in 2015, but has yet to sign a final purchase contract. Other countries have since either purchased other aircraft or lost interest in the Su-35. Sukhoi originally projected that it would export more than 160 units of the second modernized Su-35 worldwide, but sales of the Su-35 have been blunted by updated versions of the Sukhoi Su-30, and by the development of stealthy fifth generation aircraft, including Sukhoi's own T-50


Source: https://en.wikipedia.org/wiki/Sukhoi_Su-35


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Παρασκευή 24 Φεβρουαρίου 2017

World's Most Lethal Fighter Jet - USAF F-22 Raptor -true stories -Documentary 2017




The Lockheed Martin F-22 Raptor is a fifth-generation, single-seat, twin-engine, all-weather stealth tactical fighter aircraft developed for the United States Air Force (USAF). The result of the USAF's Advanced Tactical Fighter program, the aircraft was designed primarily as an air superiority fighter, but also has ground attack, electronic warfare, and signal intelligence capabilities.[6] The prime contractor, Lockheed Martin, built most of the F-22's airframe and weapons systems and did its final assembly, while Boeing provided the wings, aft fuselage, avionics integration, and training systems.

The aircraft was variously designated F-22 and F/A-22 before it formally entered service in December 2005 as the F-22A. After a protracted development and despite operational issues, the USAF considers the F-22 critical to its tactical air power, and says that the aircraft is unmatched by any known or projected fighter. The Raptor's combination of stealth, aerodynamic performance, and situational awareness gives the aircraft unprecedented air combat capabilities.

The high cost of the aircraft, a lack of clear air-to-air missions due to delays in Russian and Chinese fighter programs, a ban on exports, and development of the more versatile F-35 led to the end of F-22 production.[N 1] A final procurement tally of 187 operational production aircraft was established in 2009, and the last F-22 was delivered to the USAF in 2012.


Source: https://en.wikipedia.org/wiki/Lockheed_Martin_F-22_Raptor


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Πέμπτη 23 Φεβρουαρίου 2017

DARPA, ONR and Northrop Grumman Tern: UAS Phase 3 Completed (Project Overview and Concept Promo)



Tern, a joint program between DARPA and the U.S. Navy’s Office of Naval Research (ONR), seeks to greatly increase the effectiveness of forward-deployed small-deck ships such as destroyers and frigates by enabling them to serve as mobile launch and recovery sites for specially designed unmanned air systems (UASs). DARPA last year awarded Phase 3 of Tern to a team led by the Northrop Grumman Corporation to build a full-scale technology demonstration system. The program has since made significant advances on numerous fronts, including commencement of wing fabrication and completion of successful engine testing for its test vehicle, and DARPA has tasked Northrop Grumman with building a second test vehicle.

Tern envisions a new medium-altitude, long-endurance UAS that could operate from helicopter decks on smaller ships in rough seas or expeditionary settings while achieving efficient long-duration flight. To provide these and other previously unattainable capabilities, the Tern Phase 3 design is a tailsitting, flying-wing aircraft with a twin contra-rotating, nose-mounted propulsion system. The aircraft would lift off like a helicopter and then perform a transition maneuver to orient it for wing-borne flight for the duration of a mission. Upon mission completion, the aircraft would return to base, transition back to a vertical orientation, and land. The system is sized to fit securely inside a ship hangar for maintenance operations and storage.

Tern has accomplished the following technical milestones for its test vehicle in 2016:

Wing fabrication: Since Phase 3 work started at the beginning of 2016, Tern has finished fabricating major airframe components and anticipates final assembly in the first quarter of 2017. Once complete, the airframe will house propulsion, sensors, and other commercial off-the-shelf (COTS) systems to make up the full-scale technology demonstration vehicle.

Engine tests: In Phases 2 and 3, Tern has successfully tested numerous modifications to an existing General Electric engine to enable it to operate in both vertical and horizontal orientations. This type of engine was chosen because it is mature and powers multiple helicopter platforms currently in use.

Software integration: This summer, Tern opened its Software Integration Test Station (SITS), part of the System Integration Lab that supports software development for the program. The test station includes vehicle management system hardware and software, and uses high-fidelity simulation tools to enable rapid testing of aircraft control software in all phases of flight. The SITS is helping ensure the technology demonstration vehicle could fly safely in challenging conditions such as launch, recovery, and transition between horizontal and vertical flight.

Additional tests are about to start. A 1/5th-scale version of the approved vehicle model is in testing in the 80’ x 120’ wind tunnel at the NASA Ames Research Center’s National Full-Scale Aerodynamics Complex (NFAC). Data collected during this test will be used to better characterize aircraft aerodynamic performance and validate aerodynamic models.

Source & More Info: http://www.darpa.mil/program/tern

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