(Also called: UFO, Sleeping Beauty)
For the 'still images' version of this trick click here.
Flying Saucer is a great looking trick which can be an excellent tool for adjusting string tension. Here's how the basic trick is done.
Whether the trick results in loosening your string tension or further tightening it, depends simply upon whether you initially throw the yo-yo to the left or to the right. If thrown to the left, as instructed above, you will loosen your string. If you need to tighten it, instead of throwing the yo-yo to your left, throw it to the right, once again at the same kind of 45 degree angle. The result is that your yo-yo's horizontal spin will be clockwise instead of counter clockwise, and therefore you will more tightly wind the string instead of loosen it.
Here's a little humorous sidenote for you: If you perform Flying Saucer to loosen your string, and accidentally let it spin below your hand a bit too long, the string will actually become so loose that your UFO will slip right out of the string and crash down to Earth. This has a name too. We call it, quite appropriately .... doing a "ROSWELL"! I don't recommend you pull this one intentionally, unless your string is well-worn and crying to be changed anyway, because this will kill your string permanently. It'll be so twisted and unevenly wound, you'll never get it back into shape.