The National Air and Space Museum will present the next lecture in the GE Aviation Series May 3 with Jon and Patricia Sharp, a married couple who design, build, test and race their own planes. In “Chasing the Dream, Not the Competition,” the Sharps will talk about their original aircraft, Nemesis, the most successful aircraft in air-racing history, and the records they have set and races they’ve won. The lectures is free to the public, but tickets are required. It will begin at 8 p.m. at the museum in Washington, D.C., and will be webcast.