This paper plane is, as the name states, insanely fast. At least, it is if you throw it right. It's made in almost the same way as my stunt plane, but don't be fooled, if you make it right, it'll only ever go straight. This project needs only one sheet of foolscap (A4) paper.

Step 1: Step 1, the Base

The base for this plane is exactly the same as my stunt plane.
Step 1. Fold the top-left corner down, as if making a square.
Step 2. Do the same thing on the other top corner.
Step 3.Turn the paper over.
Step 4. Fold the paper horizontally so that the edge of the paper reaches the ends of the creases made in steps 1 & 2.
turn the paper over again and press the middle of the lines and then bring up the corners so it forms something resembling a triangle.
Note: If you're having trouble understanding this, try searching 'waterbomb base' on Google. This base is a bit like that, only it's not square.

You're done!

Step 2: Step 2, the Actual Plane

In this step the paper starts to take the shape of a plane.
Step 1. You'll notice that 2 of the 3 edges made by the triangle are loose, fold them up to the top point to form a diamond-like shape, so you get what's seen in the first photo here.
Step 2. fold the edges in like you would a simple dart.
Step 3.Take the resulting triangle-y shape as seen in photo 3, and fold this in half lengthways, to match what's seen in photo 4.
Step 4: Fold the wings in half downwards, as with any paper plane, and yours should look like what's in photo 5.

Nice work! That's the plane done. Throw it right, and it'll be really quick.