07/31/2009. Remarks by Walter van Tilborg: "The X-2 designation was used for two light flying boats designed by Edward C. Hoffman.

The first X-2 (registered N9159R and first flown 1962) was named Little Orphan Annie and was built by Hoffman. Engine was a 75 hp Continental A75 and in the construction the wings of a Taylorcraft BC-12D were used.

The second X-2 (N1736 and known as the PBY) was in 1964 completed by another amateur constructor and had a 108 hp Lycoming O-235 engine. Other changes were new built wings and a slightly taller vertical tail. The PBY was later also acquired by Hoffman, but it was lost in an accident."