In Sea Foam, a 36-foot ketch, Herb and Nancy Payson and their large brood of teenage children cruised the Pacific for six and a half years. They experienced a certain amount of stark terror, but their delights far outbalanced the drawbacks. The result is Blown Away, a kind of Swiss Family Robinson with overtones of the Marx Brothers. The situation aboard Sea Foam may frequently be desperate but is seldom serious as Herb Payson carries his readers to Tahiti, Fiji, New Zealand and dozens of other islands.