First Rotating Wing Aircraft Meeting commences
Thursday, October 27, 1938 - The Franklin Institute, Philadelphia, Pennsylvania, United States of America
This was the start date of the first professional, technical meeting dedicated to rotary wing technology. It was from this event that the American helicopter industry was born.
A view of the significance of the meeting is provided in a paper by Charnov.
Source: "AHS International Recognizes Franklin Institute as First Vertical Flight Heritage Site", AHS web page, Last accessed