The Primer was a conventional single-engined, low-winged monoplane, constructed of welded metal tubes with wood in subsidiary structures like ribs and stringers, all fabric covered.[2] The enclosed tandem dual control cockpits merged into a raised decking behind them, giving the aircraft a smooth but slightly humped look.Before the German invasion in May 1940 the machine was taken apart and shipped to England, probably in[3] September or October 1939;[5] certainly it flew from Fairey Aviation's Great West Aerodrome (the site now covered by London Heathrow Airport) for five months after November 1940.Shortly after the war OO-POM went back to Belgium for small modifications at Fairey's suggestion; they then took over the Tipsy M with the aim of producing it under licence.[4] The engine and some other parts were used to build the first production aircraft,[4] though the CAA records G-AKSX as being sold abroad in Aug 1948;[7] whether in flying condition or not is not noted.