03/31/2008. Remarks by Walter van Tilborg: "Mr. Edward C. Hoffman, an interior decorator from St. Petersburg, Florida, USA, built this single-seat light (empty 616 lb, 279 kg) sport aircraft powered by a 65 hp Continental A65 horizontally-opposed four-cylinder air-cooled engine. After a year of construction the aircraft was completed at the costs of $ 968 and the first flight was made on February 24, 1960. Later the 65 hp A65 engine was replaced by a 90 hp C90 engine.

Mr. Hoffman was a very busy builder and apart from the X-1, he created at least 4 other single-engined aircraft, including:

X-2 "Little Orphan Annie", two-seat flying boat, 1962, N9159R c/n 1
X-3 "The Girl Friend", single-seat land aircraft, 1976, N14647 c/n 1
X-4 "Mullet Skif", two-seat amphibian, 1980, N5597N c/n 1
X-5 "Seabird", single-seat amphibian, 1991, N7182P c/n 1.

I had the pleasure of meeting Mr. Hoffman and his wife many years ago during a visit to Holland. As far as I know, the X-1, X-3, X-4, and X-5 are kept in excellent and airworthy condition by Mr. Hoffman's son."