Risk of Impact Injury Prompts Recall of Estes-Cox Model Rockets This recall involves the X-15 flying model rocket, a 1:44 scale version of the North American Aviation hypersonic rocket plane. The model rockets are about 13.5-inches long and have a wingspan of about 5 inches. The rockets are black and yellow, and have the number 66670 on the tail. The rockets were sold individually (item #1890) and as part of a starter kit (item #1412). The item number is printed on the product’s instruction sheet and above the bar code on the product’s packaging.