Chapter 11 Chapter 10 Fly!fly!Fly to the sky! !

Ever since America's Superman took to the skies, a certain standard has been established: Heroes who can't fly... wow! But how to fly? First, fly with a balloon!As early as in the Ultra Q episode, the monster Balunga flew by buoyancy; and the Barry Balloon, a balloon vehicle, was also used in the hard trainers of the special photo secret team.But the weakness of this method is slow! , and is subject to weather. Icon: The hard trainers of the secret team who took the Barry balloon attack on a windy day, gone forever... The second method is to run at a speed of 7.9 kilometers per second like an artificial satellite, and you can get out of the gravity of the earth Centrifugal force and fly in the sky.But in this way, we can only fly around the earth continuously... The remaining method is to use the reaction force and other methods... Use the rocket to shoot down, or use the propeller (rotor) to blow the air down, and use the reaction force fly into the air.This is a commonly used setting... an example of flying with a propeller, Tinker Bell's bamboo dragonfly is the most popular, but... ) The first question: Without the assistance of the rear wing, can the body not turn in the opposite direction?

If a person weighing 70 kg turns with a propeller with a diameter of 2 meters and a weight of 2 kg, the person will rotate in the opposite direction at a speed of 0.77 times the speed of the propeller! !But Tinker Bell's bamboo dragonfly is very small, about 20 cm in diameter (by visual inspection)?The weight is about 200 grams (assumed)... To drive a body of about 80 kilograms and shoulder width of about 60 centimeters in this way, the reverse rotation of the body is only one ten-thousandth of the propeller speed, so it doesn't matter.This problem is solved... (Arslan's Note: Tinkerbell's set weight is about 120 kilograms, but our director Riko Yanagida seems to have not collected this set value, or wait for the original author to make a dream Just tell him...) But another question arises: with such a small propeller, wouldn’t the wind be blowing on Tinker Bell’s own head?What's more, Tinker Bell's head is very large (about 60 cm in diameter?)...Icon: the airflow diagram blown by a propeller that is less than one third of the diameter of the head... This will get twice the result with half the effort, and the thrust that can effectively reach the ground Less than 10%; that is to say, to lift a person weighing 80 kg, a thrust of 800 kg is required...a propeller with a diameter of 20 cm needs a thrust of 800 kg, and a wind speed of up to 4600 meters per second is required! (1.3 times the speed of sound!) If you are blown to the top of your head by this kind of wind, your whole head will be blown away!The whole person will be torn apart!

Icon: The result of flying with a bamboo dragonfly ~ only the bamboo dragonfly is flying with a piece of Tinker Bell’s scalp (relic?)... ...) The next method is to fly with the thrust of the rocket engine. Below we will discuss this method with Combatella V as a representative (because there are many robots flying in the same way, that is, to install jet rockets on the soles of their feet). The first problem is the fuel. One kilogram of liquid hydrogen and liquid oxygen mixed fuel can burn 450 kilograms of thrust in one second.The weight of the Combatella V is 550 tons (let's not care about how the light weight comes from, see Chapter 1 for details).To propel it to the sky, it will consume 1.2 tons of fuel in the first second (because the weight of the fuel will be lost later, and the body will become lighter and lighter).Calculated in this way, if 60% of Combatra V's body weight is fuel (too exaggerated, only 40% of its weight is the body structure?), it can only fly for 398 seconds... Forget it, it can be air combat for 6 minutes and 38 seconds. Very good, try to fight land battles... Another problem is stability. It is very unstable to push the whole body into the air with only two-footed rockets, just like holding the end of a pencil with your fingers to push it into the sky , it will keep flipping, it is difficult to fly straight up.The early Apollo rockets used four jets to maintain balance. In the experiment, one of the jets had a weaker output, and it started to turn as soon as it flew up, and it exploded when it hit the ground... There have been such examples!

In order to stabilize the posture, the first method is to install many small nozzles to adjust the posture on the upper and lower parts of the robot's body (this is the way for MS starting from Z Gundam).But the coordination of the output of this engine is very difficult to control, and... the Kombattra V full of injection ports is ugly... Another way to maintain the posture is to install a gyroscope in the body.Use the stability of this rotation to maintain the posture. But this way, the robot's posture can no longer be changed once it flies into the sky, and it can't change direction... let alone perform aerial combat!

The remaining method is to use Yangli!This is the principle of our general aircraft.According to Bernoulli's law, when an airplane flies at a speed of 1000 kilometers per hour, a wing area of ​​one square meter can obtain a lifting force of 700 kilograms. But among the robots, there are only such things as the Iron King Kong designed by Doshizang and his son, and the Great Demon God with Wings? (As for the cloak used by the Geter robot... only GUNBASTER will follow this setting) Icons: cross-sectional view of the wing, the principle of obtaining lift force in hydrodynamics, and the cross-section of the giant robot picture.It is impossible to obtain the principle of lifting force in fluid mechanics... It would be easier if the cross-section of the robot could really obtain lifting force.Calculated based on their body surface and weight, Combatella V only needs to have a speed of 0.81 times the speed of sound to obtain enough lifting force to fly; the Atomic King Kong only needs to be 0.44 times the speed of sound (of course, part of the reason It is because their weight settings are too light...see Chapter 1 for details).But the real killer is the 35,000-ton Ultraman!

With the size of Ultraman, even if its cross-section can obtain lift, it only has a wing area of ​​320 square meters!Even if he flies at 5 times the speed of sound (according to the setting, this is the fastest speed of the first generation of Superman), he can only obtain a lifting force of 8400 tons, which is less than a quarter of his weight! Want to call Ultraman Fly?Yes, to get four times more lift!Since the speed setting is five times the speed of sound and cannot be faster, there is only one way left: increase the wing area!Just flatten the body to four times its original size! ! Icon: Fly!Ultraman Meatloaf! (Should it be called Flounder?) Ultraman: Fuck it!If I want to fly like this, I would rather die! ... But even if it becomes like this, it will not be able to fly when the speed does not reach five times the speed of sound!Come on!Flounder... oh no... Superman!

Not only that, there are many fatal problems about flying, we will talk about it next time! Second preview: Just flying is not enough!It's cool to fly fast!Superman can fly out of supersonic speed, and monsters can also fly out of supersonic speed!But what happens when you go supersonic?Please see next time!