RuAviation

At the 24th International Conference Aviation and Cosmonautics, the Zhukovsky Central Aerohydrodynamic Institute (TsAGI, Russia’s leading national aerodynamics research center) presented the results of a study using a combined aerodynamic model to evaluate long-haul aircraft configurations. The paper was authored by TsAGI specialists Evgeny Pigusov and A.A. Krutov, according to the institute’s press office.

The experimental campaign was conducted under the Integral-MS research program and focused on aircraft designed to carry 220–250 passengers over a range of approximately 4,300–4,900 nautical miles (8,000–9,000 km). The primary objective was to enable a consistent comparison between a conventional configuration and several alternative layouts, while identifying the aerodynamic characteristics specific to each design.

Configuration Concepts and Test Methodology

The study examined three distinct configuration concepts:

• MS-1: a conventional configuration featuring a circular fuselage cross-section;
• MS-2: an oval fuselage combined with a low-mounted wing;
• MS-3: an oval fuselage with a mid-mounted wing and an integrated wing–fuselage fairing between the wing panels and the fuselage.

The combined model approach allowed all three configurations to be tested under identical conditions in a low-speed wind tunnel. Tests were conducted at an airspeed of approximately 165 ft/s (50 m/s), with controlled variation of angle of attack and sideslip. This methodology enabled a direct assessment of aerodynamic performance, lift characteristics, and model behavior under changing aerodynamic loads.

Key Findings and Engineering Implications

According to TsAGI, the use of an oval fuselage in combination with different wing placements may lead to improved aerodynamic efficiency and enhanced lift characteristics at low speeds. The researchers note that oval fuselage concepts could potentially reduce required takeoff and landing distances.

In addition, the oval fuselage is viewed as a design factor with the potential to lower fuel consumption, increase usable internal volume for passengers and cargo, and expand the lower-deck space of the aircraft. These attributes are of particular interest for future long-range transport aircraft concepts.

The test results provide engineers with a comparative understanding of the advantages and limitations inherent to each configuration. However, TsAGI emphasizes that, relative to the classical configuration—validated by decades of operational experience—the unconventional layouts remain insufficiently explored and require extensive, long-term research before firm conclusions can be drawn.