sentences:  The ANEC I and II, designed by W.S Shackleton, were amongst the earliest ultralight aircraft; they were very small, wooden, strut braced high-wing monoplanes.The first ANEC I, registered "G-EBHR", first flew at Brooklands on 21 August 1923.It was the first aircraft with an inverted engine, a 696 cc Blackburne Tomtit, to fly in the United Kingdom.