U S Navy X 47B UCAV's Land Based Flight Test Before Carrier Test Flight

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The Northrop Grumman X-47B  is a technology demonstrator unmanned combat air vehicle designed for aircraft carrier-based operations. Its been developed by the Northrop Grumman. The X-47 program began as part of DARPA's J-UCAS program, and U.S. Navy integrated it as it's Unmanned Combat Air System Demonstration program. 

The X-47B is a fyling-wing body aircraft powered by 1 Pratt & Whitney F100-220U turbofan engine capable of semi-autonomous operation & aerial refuelling.

In 2011 X-47B first flew, and then in 2015. There are two active demonstrators have undergone extensive flight & operational integration testing. This prestigious bird successfully performed a series of land & carrier-based flight demonstrations In August 2014. US Navy had integrated the X-47B into carrier operations alongside manned aircraft and by May 2015 the aircraft's primary test program was declared complete, had been announced by the Navy.

Northrop Grumman intends to develop the prototype X-47B into a battlefield-ready aircraft, the Unmanned Carrier-Launched Airborne Surveillance and Strike system or UCLASS, which will enter service in the 2020s.

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Tejas aircraft deficient in at least 100 technical parameters: Experts

The light combat aircraft (LCA) Tejas is deficient in at least 100 technical parameters, said experts associated with the project. They also alleged that the initial operation clearance granted to Tejas two years ago was given despite the aircraft not meeting various crucial technical parameters.

The experts said as the aircraft has not achieved crucial technical parameters, it continues to be flown only by test pilots and its performance parameters too need to be monitored by ground-based stations. They also said the engine of Tejas lacked sufficient power. Though the experts were hopeful that these issues would be resolved by the then end of 2013, still the issues aren't clear how those make the pathway to solve,  they admit complex technicalities pose serious obstacles.

In a press release issued in March, the Defence Research and Development Organisation (DRDO) admitted the delay in completion of project "Development of Light Combat Aircraft (LCA), Tejas" and said it was hopeful to achieve Full Operational Clearance (FOC) by December 2014. "The LCA project, which though got delayed initially, is currently progressing on a fast track and is working on aggressive time schedules," it said.

"Productionisation of LCA is already going on. First series production aircraft were ready by the end of 2013, which aren't inducted still in the IAF. Indian Air Force has already placed order for 20 LCA in IOC configuration and another of 20 LCA in FOC configuration," added the release.

The Tejas aircraft is being manufactured by Hindustan Aeronautics Limited (HAL). The project 'Development of LCA' was sanctioned in August 1983 and Project Definition Phase (PDP) of LCA was completed in 1988. In 1990, a decision was taken to undertake LCA development in two phases. In the first phase to build 02 Technology Demonstrators (TDs) along with development of critical technologies including Multi Mode Radar (MMR) and in the second phase to build Prototype Vehicle0s, integrate weapons, sensors, and flight testing leading to Initial Operational Clearance (IOC) and Final Operational Clearance (FOC).