[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:08.13,Default,,0000,0000,0000,,"The moment you doubt whether you can fly, you cease forever to be able to do it" - J.M Barrie
Dialogue: 0,0:00:09.13,0:00:14.77,Default,,0000,0000,0000,,Let's make a person glide.
Dialogue: 0,0:00:15.80,0:00:22.30,Default,,0000,0000,0000,,We have a man wearing a wingsuit on a platform.
Dialogue: 0,0:00:23.83,0:00:32.53,Default,,0000,0000,0000,,Let's increase the area of the wingsuit to be proportionate to a flying membrane of a flying squirrel.
Dialogue: 0,0:00:34.47,0:00:40.73,Default,,0000,0000,0000,,Then, make the man run as fast as he can to the end of the platform, and jump off.
Dialogue: 0,0:00:44.10,0:00:50.33,Default,,0000,0000,0000,,At this point, the airflow speeds up on top of the suit as the result of the suit catching air from below.
Dialogue: 0,0:00:51.40,0:00:56.97,Default,,0000,0000,0000,,It creates lift.
Dialogue: 0,0:00:57.90,0:01:06.00,Default,,0000,0000,0000,,If you run as fast as Usain Bolt with this suit, it will support 2.8kg.
Dialogue: 0,0:01:06.77,0:01:11.20,Default,,0000,0000,0000,,So, naturally this happens.
Dialogue: 0,0:01:21.37,0:01:28.87,Default,,0000,0000,0000,,For a normal person to glide in a wingsuit like this, the gravity will have to be small and the atmosphere dense.
Dialogue: 0,0:01:30.60,0:01:39.53,Default,,0000,0000,0000,,Titan, a satellite of Saturn, is one such example that is suitable for gliding with our wingsuit.
Dialogue: 0,0:01:42.23,0:01:50.63,Default,,0000,0000,0000,,Titan is a harsh environment with a temperature of -179°C and methane rain.
Dialogue: 0,0:01:51.30,0:02:01.00,Default,,0000,0000,0000,,But its gravity is 1/7th that of Earth, and its atmosphere is four times as dense as our atmosphere.
Dialogue: 0,0:02:01.67,0:02:11.23,Default,,0000,0000,0000,,We can manage to glide horizontally.
Dialogue: 0,0:02:23.37,0:02:29.60,Default,,0000,0000,0000,,If you do it on Earth, you'd have be running at 200 km/h in order to glide.
Dialogue: 0,0:02:33.17,0:02:38.67,Default,,0000,0000,0000,,This person can also enjoy horizontal gliding.
Dialogue: 0,0:02:48.90,0:02:59.20,Default,,0000,0000,0000,,If you can't run at 200 km/h, you'll need this much suit area.
Dialogue: 0,0:03:15.23,0:03:22.57,Default,,0000,0000,0000,,Now, let's think about making humans fly by flapping wings.
Dialogue: 0,0:03:24.00,0:03:32.47,Default,,0000,0000,0000,,A small hummingbird hovers by moving its wings in a "figure 8" motion 80 times per second.
Dialogue: 0,0:03:33.77,0:03:44.10,Default,,0000,0000,0000,,Let's put some light wings on a 60kg person and make him do the same motion.
Dialogue: 0,0:03:44.87,0:03:53.23,Default,,0000,0000,0000,,And increase the rate of flapping.
Dialogue: 0,0:03:53.23,0:04:02.57,Default,,0000,0000,0000,,Try flying at 80 times per second, the same rate as a hummingbird.
Dialogue: 0,0:04:04.80,0:04:13.37,Default,,0000,0000,0000,,When you are as large as a human, such flapping will only support 3.1kg.
Dialogue: 0,0:04:13.37,0:04:20.20,Default,,0000,0000,0000,,Ten times that of a hummingbird, 800 times per second, still looks like this.
Dialogue: 0,0:04:28.83,0:04:36.23,Default,,0000,0000,0000,,At 1540 times per second...
Dialogue: 0,0:04:38.93,0:04:46.17,Default,,0000,0000,0000,,Our human can now hover.
Dialogue: 0,0:05:02.93,0:05:11.73,Default,,0000,0000,0000,,Estimates from the data of other birds, a man-sized wing should be 7 meters long.
Dialogue: 0,0:05:14.93,0:05:21.53,Default,,0000,0000,0000,,You could glide with this wing.
Dialogue: 0,0:05:23.40,0:05:31.23,Default,,0000,0000,0000,,It can hover at 70 times per second, which is less than that of a hummingbird.
Dialogue: 0,0:05:37.63,0:05:45.67,Default,,0000,0000,0000,,So, as long as you don't doubt our ability to fly, we can fly.