The Hawker Hector was a British biplane army co-operation and liaison aircraft of the late 1930s; it served with the Royal Air Force and saw brief combat in the Battle of France in May 1940. Some Hectors were later sold to Ireland. It was named after the Trojan prince Hector.

The Napier Dagger was a 24-cylinder H-pattern (or H-Block) air-cooled engine designed by Frank Halford and built by Napier before World War II. It was a development of the earlier Napier Rapier.