Trajectory Prediction Theory of Supersonic High Fineness Ratio, Cruciform Fin Bodies
Abstract
A complete Jump and Dispersion Theory is developed for free flight vehicles. Six-degree-of-freedom computer computations indicate that the theory accurately predicts the jump dispersion of flechettes. The initial conditions and dispersion values are established by range test firings. The raw data is fitted by least squares method and put into initial condition form. Initial conditions are applied to the theory and 6-D numerical computations to evaluate dispersion for eight test rounds. The results are compared to test firing target data. The agreement between the theory and test results indicate the data analysis and theory provide an accurate means of predicting dispersion of flechettes. Analysis of the firing data indicates that the initial conditions result from an impulse imparted to the flechette in the muzzle blast. The transverse impulse imparted to the flechette initially must be equal to the angular impulse to obtain zero dispersion. Other disturbances in the blast region such as sabot separation influence the initial conditions and hence dispersion. First maximum yaw theory is discussed and disproved.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1980
- Accession Number
- ADA104989
Entities
People
- Lawrence Lijewski