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PICTURE: Frigate Ecojet revised as four-engined design
16 August 2017

David Kaminsk-Morrow

Russian developers of a 300-seat aircraft with a characteristic wide elliptical fuselage have opted to modify the proposal substantially, revising the design as a four-engined transport rather than a twinjet.

Frigate Ecojet

The aircraft — developed by Frigate Ecojet, and rebranded as the ’Freejet’ — will be powered by modern engines introduced for the single-aisle market.

Frigate Ecojet says it has embarked on a study to examine the use of Aviadvigatel PD-14 engines on the proposed aircraft. The PD-14 is being developed for the Irkut MC-21.

Aviadvigatel is participating in the study, it claims.

But the Ecoject team also indicates that the Pratt & Whitney PW1100G and the CFM International Leap are options.

It states that, while the aircraft was conceived as a twinjet, there is a «lack» of modern engines in the 18,000-23,000kg (177-226kN) thrust range. The twinjet would have been equipped with PD-18R or PS-90A20 engines.

But the design has been revamped as a four-engined airframe powered by engines with 12,000-14,000kg thrust. Its proposed maximum take-off weight has risen from just under 130t to a little over 140t.

«We lost a little in aerodynamics and weight [against the original Ecojet] but gained a lot of advantages», says programme manager Alexander Klimov.

The aircraft will be able to use current engine technology and will aid the evolution of an all-electric concept, he says.

Switching to a four-engined design, however, will result in an aircraft outwardly resembling the Airbus A340 — which, like the proposed Freejet, was also fitted with powerplants used on the single-aisle A320 and Boeing 737.

With an all-economy layout for 300 passengers in a 10-abreast triple-aisle cabin, the Freejet would have a range of 3,500km, claim its designers, increasing to 4,680km with 244 passengers.

The aircraft, with eight passenger exits, has a wing span of 48.53m and a length of 49.65m.

Technical specifications for the Freejet’s systems will be established by the end of the year, the developer says.

Source
Flight Global