Войдите или зарегистрируйтесь
Вы сможете писать комментарии и посты, ставить лайки и другое
Поиск
Тёмная тема

Some recent changes on Famabara

недавно
You can now insert previously uploaded images and videos into posts and comments by selecting them from a list.

If, while editing a post, a user accidentally deletes a content block, it can now be restored using a button in the notification in the corner of the screen.

New types of complaints have been added: content created by a AI and copyright infringement.

The project rules have been updated.

A small profanity check is now performed when saving a post or comment.
+2
49

The real altitude of spaceflight

недавно
Humans have been flying to space since 1961 - that's over 60 years now. These days, we even have tourist spaceflights. In sci-fi movies, people travel between planets, stars, and even galaxies.

But what is space from the perspective of aviation and astronautics? Technically, it starts somewhere between 100 and 122 kilometers above Earth's surface. The range exists because different organizations define the boundary of space slightly differently.

Is 120 kilometers really that high? The average diameter of our planet is 12,742 kilometers - quite a lot. Below, I drew a simple picture to show what a spaceflight looks like to scale:
See that tiny red dot? That’s our trip to "outer space". Not exactly impressive, right? For comparison, the International Space Station orbits at an altitude of about 418.2 km - on this scale, its point would only be a couple of pixels higher.

Human technology is still in its infancy. Legally, we can say we fly to space - but in reality, it looks more like what you see above. As for interplanetary travel, so far, only our robots have made the journey.
+2
33

How wind turbine power depends on blade length: looking at real data

9 дн. назад
Wind turbines keep getting bigger every year. There's one main reason for that: the longer the blades, the more powerful the turbine. But couldn't you just install two smaller turbines instead of one large one? To answer this, let's take a look at real-world data.

Goldwind is a Chinese wind turbine manufacturer. Here are photos of their operating turbines from the company website:
Goldwind GW 82 / 1500 - output: 1500 kW (1.5 MW). Rotor length: 82.3 meters, meaning a blade diameter of roughly 41.15 meters.

Goldwind GW 171 / 6000 - output: 6000 kW (6.0 MW). Rotor length: 171 meters, giving a blade diameter of about 85.5 meters.

Even here you can already see that the relationship between blade length and output is nonlinear. The second turbine's blade is 2.07x longer, but the power is 4x higher!

Vestas is a wind turbine manufacturer from Denmark (their turbines are shown in the next photo):
Показать полностью...
+1
3