In total contrast to the Single Spey, the Double Spey is designed for use in a downstream wind. Lets face it we need a cast for all situations where necessary. The reason it is called a Double Spey cast is simply because it is made up of two basic movements. As with most casts, there are various styles of Double Spey cast, but as long as the mechanics are correct then the style you choose will work. Here are the basic movements.
Movement 1. (The upstream draw)
As we are faced with a downstream wind, we need to form our D loop on our downstream side, not only is this safer, but it is also more efficient as the wind will hold it there and not blow it towards us. From a fished out downstream position, lift the rod tip to approximately 45 degrees from the water surface then draw the fly line, leader and fly (under tension) in a progressive acceleration upstream until you have placed your fly in a position on the water (downstream of you) facing the direction in which you wish to cast. By doing this you will have also placed some fly line upstream of you (see picture on the right) which you will require to create a D loop directly behind your fly on the downstream side when executing movement 2 (see picture below).
Movement 2. (The downstream sweep)
Following on from movement 1. Starting from a low position again, this time with the rod tip upstream of you, (see picture above) sweep the fly line downstream with a smooth progressive acceleration (once again, under tension) whilst at the same time gradually climbing the rod tip up and around an imaginary spiral staircase. When you are at the top of the staircase and directly behind your fly on the water, your D loop should then be formed and ready to deliver (see picture here). The direction to which you deliver the cast (for maximum efficiency) will be dependant on your fly placement at the time your D loop has formed.
Remember as in the Single Spey, this rule applies to both banks, the only difference with this particular cast is as follows: left bank Left hand up and right bank right hand up.
For further information on the Double Spey cast you can view a more in depth article in a PDF document on the following link Click here. This article can also be accessed from the bottom of the Home Page under the heading of Six of the Best Spey Casts.