Articles with tag: "icing tunnel test"

(Note: figures do not appear in the summaries below)

  1. NACA-RM-SE9D20

    "After 7 minutes of icing, however, one antenna element experienced a vibratory failure"

    "Vibration and Investigation of CAA Type V-I09 Very-High-Frequency Aircraft Antenna" 1

    Figure 2. Failure at omnidirectional aircraft antenna resulting from vibration under icing conditions.

    Abstract

    Vibration and icing determinations on a CAA type V-109 very- high-frequency aircraft antenna were conducted in the NACA Lewis icing research tunnel. The antenna is an omnidirectional-range unit that consists of two aluminum elements mounted in a streamline plastic head forming a V in plan view with an apex angle of 80°.

    Vibration determinations during a nonicing experiment produced element-tip total amplitude of approximately 1/4 inch at a tunnel-air velocity of 300 miles per hour.

    During the icing investigation, a total amplitude as great as 7 inches was observed at the antenna-element tips with tunnel-air velocities greater than 160 miles per hour and a tunnel-air temperature of 20° F. At the higher tunnel-air temperatures, which produced a heavier and more severe ice accretion, the …

    read more