The unique flat nozzle demonstrated during the roll-out of the latest S-70 ‘Okhotnik’ (‘Hunter’) heavy strike drone will most likely be installed on the next modifications of the Su-57 fifth-generation fighter for stealth purposes, Russian Air Force merited pilot Major-General Vladimir Popov told TASS on Tuesday.

Russia’s Defense Ministry uploaded a video clip earlier on Tuesday showing the roll-out of the latest version of the S-70 ‘Okhotnik’ stealth heavy strike drone furnished with a unique flat nozzle thruster to cut its signature for enemy radars.

"Similar measures will most likely be taken for the Su-57 but this will be, perhaps, the second stage of its development. A new engine will be mounted on it," the military pilot said, commenting on the roll-out of the first flight prototype of the latest Okhotnik heavy strike drone at the Novosibirsk Aviation Enterprise on December 14.

A modified engine will most likely feature a flat nozzle, he said. "However, considering that the fighter employs afterburner acceleration modes, this nozzle must have the option of altering its configuration," Popov said.

"Mounted on the fighter, it must both expand and narrow its throughput capacity," the pilot said, adding that the flat nozzle technology was undoubtedly a breakthrough in modern aircraft-building.