Claim: The Hawker Tempest, which was used primarily by the Royal Air Force, was an improvement on the design of the Typhoon.
Evidence: The Hawker Tempest was a British fighter aircraft primarily used by the Royal Air Force (RAF) in the Second World War. The Tempest, originally known as the Typhoon II, was an improved derivative of the Hawker Typhoon, intended to address the Typhoon's unexpected deterioration in performance at high altitude by replacing its wing with a thinner laminar flow design.