The Performance of Cargo Airdrop Systems Using G-12E Parachutes: Statistical Determination of Minimum Altitude.
Final rept. Mar 93-Nov 94,
ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA
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In order to reduce the exposure of aircraft to hostile fire, the U.S. Air Force is interested in dropping cargo from the lowest possible altitude above ground level. Using trajectory data from previous airdrop system testing, this report statistically determines the minimum altitude above ground level AOL from which airdrop systems comprising clusters of two to three G-12E parachutes may safely deliver cargoes up to 5000 pounds. The methods used to compute variables of interest, such as system tension and system orientation, are presented. To support this statistical analysis, intervals were defined based upon clearly discernible events. This led to a reexamination of so-called functional phases, used by the airdrop community. Some phases were found unsuitable for statistical purposes. To resolve this problem, process intervals were defined based upon clearly discernible process states or events. Based upon the limited data available, it was found that G-12E airdrop systems can safely deliver cargoes of up to 5000 pounds when released from aircraft at an altitude of approximately 300 feet AGL. AN
- Gliders and Parachutes