A Parametric Study of the Effects of Static Margin and Ejector Force on Separation Trajectories of M-117 Bombs from Inboard Triple Ejector Rack Stations on F-4C Aircraft.
Abstract
A parametric wind tunnel test was performed to determine the influence of weapon static margin and bomb rack ejection force on the separation characteristics of an M-117 bomb from an inboard triple ejector rack on the F-4 aircraft. The results of separation trajectory analyses are correlated with existing interference flow field survey data to determine the type of forces acting on the store in proximity to the aircraft. These forces can be generalized to other similar stores. It was found that a store shape similar to the M-117 pitched down and yawed outboard quite severely when separated from the inboard shoulder station of the triple ejector rack. These large perturbations could be reduced, however, with a forward shift in cg location. Separations from the bottom station exhibited very large pitch-down initial motions with little yaw. As the Mach number increased, the pitch down became larger. A forward cg location, high ejection force, and external positive moment imparted to the store at release would be necessary to produce any significant reduction in the large pitch amplitude. The TER does not have the capability of shifting the store to provide an external moment from the ejector piston nor does it have sufficient ejector force to permit a trajectory with minimum perturbations when a store similar to the M-117 is launched from the bottom station. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1971
- Accession Number
- AD0887029
Entities
People
- Stephen C. Korn