Giant Russian AN-2 biplane upgraded to 'strutless'

Sukhoi is developing the giant Russian biplane, the Antonov AN-2, with a new airframe made from carbon fibre composites meaning there is no need for bracing trusses between the wings, as on the original and traditional biplanes. The AN-2 also has a new Honeywell TPE331 turboprop engine. The aircraft had its maiden flight recently and Sukhoi intends to put the aircraft into production.

Hundreds of the original AN-2 – which dates back to 1947 – are still in use in Russia and other remote areas. The aircraft’s ability to withstand harsh conditions and for slow and low flight make it an ideal rough strip aircraft. It can also carry large loads.

Maiden flight of the revised AN-2 multi-role aircraft took place at Eltsovka Airfield, flown by test pilot Vladimir Barsuk, who is also Director of SibNIA (Siberian Aeronautical Research Institute) which was given the job of developing the upgrades.

“The aircraft design embodies the latest technologies,” said Barsuk. “Panels, spars and ribs of the biplane are made of carbon fibre. Two new wings of the biplane made of composites are joined in the form of ‘rack’ by a smooth junction. There are no bracing trusses which allows for increased cruise and maximum speed [by 1.5 times]. Minimum speed close to zero was reached during the first flight.”