Asia-Pacific Staff New Delhi

India has unveiled an updated design for its so-called fifth-generation fighter concept, known as the Advanced Medium Combat Aircraft (AMCA).

Representations of the fighter have changed often in the last few years. But the 1:8-scale model of the concept displayed at last month's Aero India 2013 show in Bengaluru is the final configuration and the one with which the program will proceed.

The twin-engine, stealthy, multirole fighter was first unveiled at the Aero India show in 2009, in the form of a metal wind-tunnel model. At the show in 2011, a reshaped model revealed an F-22-like appearance.

The final design, or at least the one the concept designers have put out this year, is strongly reminiscent of the Northrop Grumman YF-23 prototype that lost the Advanced Tactical Fighter competition to the Lockheed YF-22 in 1991 in what became the F-22 program.

The AMCA's new fuselage is stretched, with symmetric trapezoidal wings, notably losing the leading-edge extensions that were once part of the design. The aircraft will have an internal weapons bay and fully indigenous stealth technologies now under development, including radar-absorbent paint and composites.

That is the plan, at any rate. With the country's Tejas Light Combat Aircraft (LCA) program increasingly adrift ahead of a 2015 squadron service target, there has been skepticism within the Indian air force about the pragmatism of committing resources toward an indigenous fifth-generation platform, especially when more than $10 billion will soon be committed to the Hindustan Aeronautics Ltd. (HAL)-Sukhoi T-50-based fighter program. But those concerns have not stood in the way of resources and funding flowing into the AMCA program and an elaborate wish list of technologies being lined up to define an aircraft that almost certainly will not see a first flight before the next decade.