Nostromo

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Verification of Cartridge Ballistic Flight

Nostromo was tasked to validate ballistic flight of a clients ammunition. In collaboration with Weibel, we obtained with a fixed head doppler radar the provided velocity as function of time for the first part of the trajectory of the projectile. In addition, we obtain test data with a 2 nd dopopler tracking radar that provided information of range, altitude, drift, and velocity as functions of time.

This tracking radar covered the entire trajectory of projectile shot in the test. Our analysis of radar test data for our client allowed us to provide a validation of aerodynamic drag force coefficient vs. Mach number. We used this validated relationship to model the projectile trajectory, allowing the construction of range tables.

Project: Acquisition and Analysis of Doppler Tracking Radar Data for client ammunition.

A tracking doppler radar was used to test the performance of a .50 cal ammunition. The test data obtained was analyzed to generate a trendline of drag force coefficient vs. Mach number.

The trendline of drag force coefficient vs. Mach number was used to model the trajectory of the ammunition. The modeled trajectory was compared with the test data to validate the trendline of drag force coefficient vs. Mach number.

With validated trendline of drag force coefficient vs. Mach number, several trajectories were modeled with different gun elevation angles. The obtained relation of end range vs. gun elevation angle was used to generate the range tables for the ammunition.