PUDDLE JUMPERS. Ray Stits of Stits Aircraft, W. Riverside Airport, Calif., has provided U.S. amateur builders with a series of attractive ultra-light designs. One of his latest creations is the two-seat SA-7B Skycoupe (c/n. 202) which looks like a miniature Piper Tri-Pacer. The prototype SA-7B is powered by a 65-h.p. Continental C65. Only the latter is available ex-works and in kit form.