What is a bamboo dragonfly? How is it made?0 points

The bamboo dragonfly is a traditional Han Chinese folk toy for children, which has been widely spread. When you play, rub your hands together and then let go, the bamboo dragonfly will fly up into the sky. After rotating for a while, it will come down. It is a subtle invention in ancient China. This simple but magical toy once amazed Western missionaries, who called it the "Chinese Spiral". In the 1930s, the Germans invented the helicopter propeller based on the shape and principle of the bamboo dragonfly.

The bamboo dragonfly consists of two parts. One is the bamboo handle. With a piece of bamboo cut 20 centimeters long, 4 to 5 millimeters in diameter bamboo pole (handle). The second is the "wings". With a piece of bamboo 18 to 20 centimeters long, 2 centimeters wide, 0.3 centimeters thick, the middle of a small round hole of 4 to 5 millimeters in diameter, used to install the bamboo handle. Then in the small hole on each side of the symmetry of a beveled surface, in order to play the role of the bamboo dragonfly with the air vortex rise. After the wings are done, insert the bamboo handle into its small hole. When you play, use both palms to hold the bamboo handle, quickly rub it, and once you let go of both hands, the bamboo dragonfly will fly into the sky.

Material preparation: ?

15cm long, 2cm wide, 1cm thick piece of chipped bamboo or lightweight wood

A small bamboo stick (about 15cm long) ?

Tools:

One straightedge, one small saw, one hobby knife.

Bamboo dragonfly production steps:

1. Take a piece of bamboo or wood, with a saw and other tools it processed into a handle for: 15cm long, 2cm wide, 0.6cm thick piece of wood.

Take a piece of bamboo or wood.

2. Measure the center of the bamboo block with a ruler, use a pen to mark the center of the point, and then in the distance from the center of the point on both sides of the line about 1.0cm each (wood block on the bottom of all to draw) ?

3. Use a craftsman's knife to cut the part where the slanting line is drawn into a beveled surface. Processing is as follows:

Use a small saw to make a saw kerf on the top and bottom sides of the bamboo piece scribed line.

(1) The upper saw kerf on the left side should be "low on the outside and high on the inside", and the lower saw kerf "high on the outside and low on the inside". The top saw kerf on the right side is "high on the outside, low on the inside" and the bottom kerf is "low on the outside, high on the inside".

The depth of one of the sawn seams at the low end is 0.2 mm from the bottom of the bottom piece.

(2) Use a craftsman's knife to remove excess wood from the saw kerf in the center of the left and right sides respectively.

4. Punch a small hole in the center of the bamboo piece with. ?

5. Take a bamboo stick about 14cm long, cut the top end to the right size, coat it with white glue and insert it into the center hole of the bamboo piece.

6.

6. Rub the bamboo stick at the lower end of the bamboo dragonfly for a test flight.

6. Rub the lower end of the bamboo dragonfly stick to try to fly.