NewCheat sheets & tools
Split-S Trick Card Sticker
Roll upside down, pull through, fly back under: the Split-S drawn move by move.

Learn the trick
Press Next move and watch the quad fly it. Each move is one symbol on the sticker.
Up behind the obstacle, over the top upside down, and back through underneath.
Before you start
Start low and fly towards the obstacle, passing underneath it.
Sticks steady: just fly your line.
Shown for a Mode 2 radio: throttle on the left stick.
In acro mode the sticks turn the quad, and it keeps its angle when you let go. So every move is the same: push the stick, wait until the quad has turned far enough, centre the stick.
Learn each trick in a simulator first, then try it high up, away from people.
Details
The Power Loop drawn from the side: from underneath the obstacle, throttle up and pull back to climb behind it, over the top upside down, throttle off, keep pulling back, and throttle up again to level out as you pass back underneath. The triangles show where the throttle goes on and off. The red block on each quad is the camera.
The guide above flies it one move at a time and shows which stick to push. Learn it in a simulator first.
Check the quality of my sticker article here.