S-61N Demonstrator Scale: 1/48 scale model Wing Span: 14.5 inches Length: 14 inches PRODUCT DETAILS The S-61N Demonstrator is a civil variant of the successful SH-3 Sea King helicopter. ... It is almost identical to the S-61L, but the S-61N is optimized for overwater operations, particularly oil rig support, by retaining the floats found on the original SH-3 Sea King design.