An experimental airplane crashed Thursday afternoon at Hensley Airpark off of Chuckey Pike in Greene County. 66 year old Jack Cooper and his passenger, 50 year old Mark Bravo were both injured. Both men were taken to the Johnson City Medical Center. It's believed that the plane experienced mechanical problems shortly after take off. The plane crashed into a grassy field not too far from the runway. The FAA is investigating the crash. (jb)