R.A.F RESCUE LAUNCH

A high-speed launch (HSL) is a type of military boat typically used for air-sea rescue operations. The British Royal Air Force (RAF) and others used HSLs especially during World War II.

Whaleback HSL 164, a Type Two 63 ft HSL, off Colombo with a Hawker Hurricane overhead

The 64 ft. high-speed, air/sea rescue launch built by British Power Boat Company (BPBC) was one of the earliest high-speed offshore rescue vessel used by the Royal Air Force.^[1] The prototype, numbered 100, gave its name to the class as the "100 class"; High Speed Launch 102 is the only surviving boat from that class.^[1] It was tested in 1936 and production boats were delivered in 1937.^[2]

Later designs included the 1941 Type Two 63 ft HSL"Whaleback", an adaptation of a motor anti-submarine boat, the first HSL to include gun turrets.^[3] British Power Boat chief designer George Selman later designed the 68 ft. "Hants & Dorset" ^[4]

By May 1944, The RAF had 130 HSLs.^[5]