Speed Agile Transport Vehicle Concept Undergoes Critical Testing
By Holly Jordan, AFRL/RBOO, Air Vehicles
/ Published November 22, 2011
WRIGHT-PATTERSON AIR FORCE BASE, Ohio -- AFRL researchers are embarking upon a critical set of experiments designed to test a new Short Take Off and Landing (STOL) transport vehicle concept. During this set of experiments, a 23 percent scale model vehicle is being tested in the Arnold Engineering and Development Center's (AEDC) National Full Scale Aerodynamics Complex (NFAC), the world's largest wind tunnel. This testing will validate the low speed aerodynamic performance of the hybrid powered lift system. Powered testing at this scale with Williams FJ-44 engines achieves realistic conditions and allows researchers to obtain crucial data on lateral directional stability, ground effects, aircraft performance, engine performance, and engine operability.
Data gathered from the testing will be analyzed to determine the technology's applicability toward future vehicles. This technology could potentially benefit transport aircraft in both the civil and military realms.
The Speed Agile Concept Demonstrator (SACD) concept is a four-engine, multi-mission aircraft that offers speed agility; operates routinely from short, improvised airfields; carries larger and heavier payloads; and employs precise and simple flight controls. The SACD's high-efficiency STOL design incorporates a hybrid powered lift system. This lift system features a simplified mechanical design and low-drag integration. Together, these features greatly reduce both the vehicle weight and overall drag on the vehicle, resulting in greater efficiency and payload capacity than conventional powered lift systems. An aircraft employing Speed Agile technology could potentially operate from short, unprepared airfields. These benefits, coupled with the overall vehicle efficiency, could result in an extremely versatile aircraft capable of quickly and safely transporting equipment, supplies, and troops to remote areas.