VII. CONCLUSIONS
Considerable experimental work has been done in conjunction with the study of balloons and controls. The description of operating procedures and the use of specially developed equipment is included in Part II of this report, "Operations," (bound separately).
A summary of the results of flights made to test equipment and controls is given in Part III, "Summary of Flights." At this time the use of thin polyethylene balloons with pressure-activated ballast controls has been demonstrated effectively to meet the contract requirements. Tests made on another contract have found controls consistently active over 24 hours with an average pressure constancy of ±2 mb. at 200 mb. Even greater ballast efficiency has been found at higher altitudes using the same pressure-activated controls.
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