Control Line AerobaticsBy Joe Daly | stunt38060@gmail.com THERE IS NOTHING better than the sound of four motors running in perfect harmony! Paul Walker sent me this great story on his new B-17. It is stunning—the engineering, the construction, and the finishing are as close to perfection as it gets! The full article is on the Flying Lines website, the link to which can be found in "Sources."In the early 1990s, the concept of a B-17 Stunt airplane took shape. The first model was powered by four O.S. 15 FP engines with four separate tanks. A few years later, the second B-17 was built using…