[2] The Origins of the Spey and Welsh Throw: .There are two categories of D loop casts: the double and the single motion.
[4] When spey casting was introduced, 22-foot (6.7 m) rods called the "Great Vibration" created by rod-maker Alexander Grant of Inverness were used.
These rods were made of spliced greenheart, a heavy wood imported from British Guyana.
This back-cast is often referred to as the "D-loop", from the curving shape of the line between the anchor and the tip of the rod.
While swinging the "D-loop", it is important to make one continuous, deliberate motion with the rod tip climbing at a 45-degree angle off the water.
This Double Spey cast is useful in scenarios with a long line, downstream winds, and obstacles behind the fisher.
[2] The world's longest 15 ft 1 in (4.60 m) single spey cast was made by Geir Hansen from Norway.
Hansen also set the world record for the 18ft class, with a 77.0 metres (252.6 ft) cast, at the same event.
[9] Japan's Sasanuma Taishi recorded a total of 238 metres with four casts in a Spey-O-Rama rules SACC competition held in Sayama.