"At the first stage, there will be dozens of planes, more than 50,"said Vladimir Popovkin, deputy defense minister for arms procurement.
He was on hand as Russian Prime Minister Vladimir Putin observed the test flight of a prototype fighter and later talked to the pilot, Sergei Bogdan, who said it was the fighter's 16th test flight and more would follow shortly.
Popovkin said that based on the outcome of initial tests, the Defense Ministry would purchase the first six to 10 aircraft after 2012.
He said the fighter will be superior to U.S. analogs.
"The requirements we are setting on this plane are well above those for the U.S. fifth-generation aircraft," he said.
Putin said the Russian fighter will be about three times as cheap as its foreign analogs.
The prime minister said 30 billion rubles (around $1 billion) had already been spent on the projectand another 30 billion would be required to complete it, after whichthe engine, weaponry and other components would be upgraded.
He said, factoring in modernization and upgrades, the fighter will have a service life of 30-35 years.
As Putin climbed into the cockpit of the plane, Bogdan began tellinghim about the aircraft's unique features, in particular the yoke thatwas very convenient, especially during overloads.
"I know, I have some flying experience," Putin said.
In 2000, then acting president Putin co-piloted a Sukhoi-27 Flankerfighter jet from Krasnodar to Chechnya's capital of Grozny ahead ofpresidential elections.
Russia's only known fifth-generation project is Sukhoi's PAK FA and the current prototype is the T-50. It is designed to compete with the U.S. F-22 Raptor, so far the world's only fifth-generation fighter, and the F-35 Lightning II.
Russia has been developing its newest fighter since the 1990s. Thecountry's top military officials have said the stealth fighter jet witha range of up to 5,500 km should enter service with the Air Force in 2015.
The PAK FA is to be armed with next-generation air-to-air, air-to-surface, and air-to-ship missiles, and has two 30-mm cannons.
