JOINED-WING TILTROTOR AIRCRAFT STUDY

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$79,998.00
Award Year:
1989
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Agency Tracking Number:
10559
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Aca Industries Inc
28603 Trailriders Dr, Rancho Palo Verdes, CA, 90274
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Julian Wolkovitch
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
THE JOINED-WING AIRPLANE IS A NEW TYPE OF AIRCRAFT CONFIGURATION EMPLOYING TWO SETS OF WINGS RIGIDLY CONNECTED TOGETHER TO FORM A TRIANGULATED SELF-BRACING STRUCTURE. FINITE-ELEMENT STRUCTURAL ANALYSES AND WIND-TUNNEL TESTS HAVE SHOWN THAT, COMPARED TO CANTILEVER-WING AIRCRAFT, JOINED WING AIRCRAFT ARE LIGHTER, STIFFER, AND HAVE HIGHER SPAN-EFFICIENCY FACTORS, GIVING LOWER INDUCED DRAG. THE JOINED WING ALSO PERMITS THINNER AIRFOILS TO BE USED, THUS INCREASING THE MACH NUMBER FOR DRAG DIVERGENCE AND THE MAXIMUM SPEED. THE PROPOSED STUDY INVESTIGATES THE APPLICATION OF THE JOINED WING TO TILTROTORAIRCRAFT. FOR SUCH AIRCRAFT, IN ADDITION TO THE ADVANTAGES CITED ABOVE, THE JOINED WING MAY REDUCE ADVERSE DOWNWASH EFFECTS IN HOVER. THE PROPOSED STUDY WILL DELINEATE JOINED-WING TILTROTOR CONFIGURATIONS THAT GIVE MAXIMUM INCREASES IN PERFORMANCE. THE STUDY WILL COMPARE THE PERFORMANCE AND AERO-ELASTIC CHARACTERISTICS OF SUCH CONFIGURATIONS VERSUS CANTILEVER CONFIGURATIONS. IN ADDITION, THE STUDY WILL OUTLINE DETAILED ANALYSES AND TESTS WHICH WILL PROVIDE A DATA BASE FOR DESIGN OF JOINED-WING TILTROTOR AIRCFAFT.

* information listed above is at the time of submission.

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