Sweeney designed hang gliders for Sky Sports, an
East Coast hang glider manufacturer in the mid-1970s. While working for Sky Sports, along with other members of the Sky Sports design team, including designer Tom Peghiny and pilot Dennis Pagen, Sweeney contributed to the design of the Sirocco I, Sirocco II, Osprey, Merlin, and Kestrel. Sweeney was one of the first to incorporate double sail surfaces and an enclosed crossbar in his glider designs. To improve pitch stability of these early Rogallo designs Sweeney added a strut under the sail of each wingtip, which were then attached to the top of the kingpost with a cable. ==Hang gliding instructor==