to make an aircraft out of paper, you don't have to fold it into the shape of a paper airplane. What we introduce today is a kind of paper aircraft with special flying posture. It is easy to make, and you don't even need to find a good angle to throw it. Just throw it into the air and you can roll forward.

this gadget is called a Tumblewing, and it is usually made of very thin paper. The key structure is the two folding edges on the long side of the strip of paper, which allow the piece of paper to rotate in the fall. There are several different ways to make it. Let's start with one that I think works better (this method refers to the video of tubing user yattemita325, and the effect above is also from this video, which should be slow).

first find a piece of sulfuric acid paper. This is the very thin, translucent paper below. The weighing paper in the chemistry lab is made of this material, and it is also used for mapping. Many old tutorials would advise you to use the inner pages of the yellow pages phone book, also because the phone book with a lot of numbers is printed on very thin paper, but I think the phone book may not be as easy to find as sulfuric acid paper right now.

(the translucent paper above is sulfuric acid paper)

next, cut a rectangular strip of 3cm × 9cm on the sulfuric acid paper. Fold the following picture (about 90 °):

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then find an one-dollar coin and use it as a template to draw two circles on sulfuric acid paper. Cut out these two circles.

squeeze out some white latex, dip the two short edges of the folded paper in the glue and stick the round piece of paper (the round piece is perpendicular to the long piece of paper). After the glue dries, it looks like this:

then you can release it. A more effective method is shown below, which pinches the hem of the flip wing facing up from the middle, gives it a downward speed and lets go (you don't need to throw it forward, just hold it up and take it down). Next, the tumbling wing rotates and glides forward and downward.

(release position)

if both sides are perfectly symmetrical, the gadget should fly straight forward, and if it is always leaning to one side, the angle of the hem can be adjusted slightly.

here's a more interesting game: use cardboard to make the tumbling wing fly for a long time! This process is a bit tricky: when the tumbling wing flies forward, lift a piece of cardboard large enough (angle and position below) to follow its speed. While walking, slightly tilted cardboard can provide updraft under the tumbling wing, holding it up, and if operated skillfully enough to keep the gadget flying at the same altitude for quite a long time.

schematic diagram (main point: keep the flip wing in the position above the cardboard and follow its direction):

actual effect:

(recorder: xenophil0)

there are several other methods that do not require bonding, which can be folded directly with rectangular thin strips of paper, but I personally think that this method mentioned above is easier to maintain symmetry on both sides of the device.

here you can find a version that only needs to be folded: http://www.ntcu.edu.tw/scigame/paper/paper-013.html