article_snippet.sent: These small aircraft or UAV devices concern me because These small aircraft or UAV devices could go undetected and cause damage,
article_snippet.sent: It's not unusual for a small aircraft like a gyrocopter to go undetected by conventional radar.
article_snippet.sent: Unlike most larger aircraft, a gyrocopter doesn't have a transponder that identifies the aircraft, a gyrocopter altitude and heading.
article_snippet.sent: Even without a transponder, radar can detect 'primary targets' - planes, flocks of birds, rain and other objects.
article_snippet.sent: But how well it can detect those objects depends upon several factors.