Use: flying. Paragliding itself has no power. Apart from the special shape of the umbrella when it is inflated, it is controlled by the pilot and combined with various characteristics in the atmosphere. Traditional parachutes, that is, ordinary parachutes, can only produce descending resistance in the air without lift, while paragliders will produce speed and lift in the process of flying in the air, which is much greater than the resistance.
2. umbrellas
Uses: rain and snow protection. There is a legend that Luban built many pavilions around his neighbors for everyone to use, but he still couldn't let people in and out freely in the stormy season. Lu Ban's wife then made a lightweight bamboo pavilion out of oil paper according to the style of the pavilion built by her husband-this is the earliest umbrella.
Step 3: sunshade
Usage: Avoid direct sunlight. The important indexes of sunshade are UPF (ultraviolet protection coefficient), size, weight, handle material, umbrella cloth material, skeleton number, folding length and so on. Generally, the higher the UPF value, the stronger the ability to isolate ultraviolet rays; The larger the size, the larger the area under the sun umbrella.
Extended data
Featured umbrella:
1, nano umbrella
Nano-umbrellas include three-fold umbrellas and straight umbrellas. Nano-raincoats can be transformed from nano-umbrellas. Nano-raincoats are different from ordinary raincoats because they can ensure that they are absolutely not wet from head to toe. Because of nano-materials, this umbrella can be dried completely at once. After the umbrella becomes a raincoat, the wearer only needs to jump lightly and the raincoat can be completely dried.
2. Reverse umbrella
The reverse umbrella can be folded in reverse, and its inventor is the 6 1 year-old British inventor Janan Kazim. The opening and closing directions of this kind of umbrella are opposite, which can drain the rainwater accumulated in the umbrella well.
The anti-umbrella also avoids the embarrassment that the umbrella bone pokes the head of passers-by. According to the inventor, this new design means that once the umbrella is put away, users can stay dry for a long time to avoid being injured in strong winds.
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