FSX Bristol Bulldog IIA. The Bristol Bulldog was a single seat biplane fighter of the inter-war period and one of the most famous aircraft used by the RAF during that time. The Bulldog Mk II entered service with the Royal Air Force in May 1929. It is remembered for spectacular aerial formation displays at the annual Hendon RAF competition. The Bulldog's superb maneuverability and ease of handling made it very popular with its pilots. The Spanish used the Bulldog at the outset of the Spanish Civil War on the Republican side. This is AlphaSim freeware Bristol Bulldog. Upgrade to FSX/FSX Acceleration by A.F. Scrub.