Zachos, D. R., Weist, L., Brentner, K. S., & Greenwood, E. (2022). Variation in Helicopter Noise During Approach Maneuvers. Paper presented at 78th Vertical Flight Society Annual Forum and Technology Display, FORUM 2022, May 10-12, Fort Worth, United States.
![white clouds above silhouette of clouds at day](https://s3.wp.wsu.edu/uploads/sites/192/2019/10/brady-bellini-_hpk_92Crhs-unsplash.jpg)