Summary

This Toolbox calculates the drag coefficient of various blunted forebody shapes at zero incidence for Mach numbers up to 10. The bodies considered are at zero incidence and are axisymmetric, with long cylindrical midbodies immediately behind them. The program follows the method of ESDU 80021 with graphical data held in digital form.

The forebody shapes considered fall into the following three groups:

1. Ellipsoidal
   (forebody fineness ratio $f$ = 0 to 5 over the Mach number range $M$ = 0 to 10).
2. Spherically-blunted tangent ogives
   (forebody fineness ratio $f$ = 1 to 4, bluntness parameter $b$ = 0 to 1 over the Mach number range $M$ = 0.7 to 4.5).
3. Flat-faced with radiused shoulders
   (bluntness parameter $b$ = 0 to 1.0 over the Mach number range $M$ = 0 to 10).

The sketch below illustrates the geometry of forebodies considered in the Data Item.

Note: The user should consult ESDU 80021 for full specifications and discussions of the configurations and flow conditions covered by the data used in the derivation of the method, and additional advice on the applicability.

For the precise definition of each input and output parameter see Section 1: Notation and Units, of ESDU 80021.