If there is a bamboo copter for "Doraemon", can I actually fly in the sky?

Hello, I'm Rio Yanagida of the Flying Science Research Institute.We enjoy manga, animation, special effects programs, etc. from the perspective of fantasy science.By the way, this week's research report ...

There are a lot of "amazing items" that appear in manga and anime, but the bamboo copter of "Doraemon" is stimulated by scientific gokoro.

Put a small propeller on your head and feel free to fly in the sky.You can fly from the window of Nobita's room.Even if you are chased by a dinosaur, you can quickly escape.It looks convenient.If you can use it like manga or anime, I definitely want to use it!

I have never heard of a bamboo copter that was actually developed.The drone has been completely established, but no one is flying with a bamboo copter.

I think it's a convenient goods full of dreams, but why?

◆ Bamboo copter problems

Because it is a "bamboo copter", it will be the idea of bamboo dragonbox + helicopter.Bamboo dragonbox and helicopter are actually flying, but why isn't the bamboo copter realized?

If you look for the difference between a bamboo copter and a helicopter, you will see the size of the propeller.The helicopter has a much larger rotor than the aircraft.

For example, in the case of a private helicopter called BK117, the left and right width of the aircraft is 1..Even though it is 73m, the rotor is 10.8m.There are more than 6 times.Helicopters are windy by rotating such a huge rotor, generating lift and flying (it can be viewed by the reaction of moving the air down).

Perhaps the bamboo copter will fly on the same principle.

But the propeller is very small.Doraemon is around the head 129.Since it is set to 3cm, this is a pi 3.If you divide by 14, the diameter is 41cm.

On the other hand, the diameter of the bamboo copter is about 20cm at most, depending on whether there is half of Doraemon's head compared to manga and animation paintings.

Then it will be a big deal.

If a propeller that is much smaller than the head is on the top of the head, the wind caused by the propeller hits your head!As a result, the head is held downward.

On the other hand, only the top of the head is lifted by a bamboo copter trying to rise.In other words, Doraemon's head has two contradictory power, "pushing down" and "lifting power."

In this confusing situation, only the wind that leaks a little from the area around the head is useful.

Assuming the leaked wind is 10 % of the total, weighs 129.In order for 3kg Doraemon to fly, the propeller must gain 1293kg.Then 90 % of 1163.7kg holds down his head and deducted 129.3kg will lift Doraemon's body.

But what happens if you do that?

Although the whole head is holding down, only the bamboo copter is in contact with the bamboo captor is pulled up with a monosogui force that exceeds it!This is tough!

Doraemon's head, which has been pulled only at the top, may be transformed into a shape like a water drop.Nevertheless, if you continue to rotate, your head will eventually crack, the scalp will peel off, and only a small skin will fly with the bamboo copter.Hey.

◆ Should I increase the number?

It's been an Osoroshiy story because it's the current bamboo copter.If you think about how to improve or think about how to operate it, you may be able to do something without being crisp.

In order to avoid the wind on the head, there is a method of "enlarging the propeller", but if you consider the size of the bamboo copter as it is, the recommendation is to "add multiple".

The problem is number.There are many drones with four rotors, but bamboo copters weight 129.You have to carry 3kg Doraemon.The weight that can be supported by one propeller with a diameter of 20 cm is 1.Because it is 2kg, four or five are not enough at all.If you calculate, the number of bamboo copters that Doraemon should put on the body is really 108!Oh, it's the same as the number of human anxiety.

It's not just a coincidence.When it comes to 108 pieces, it is impossible with the head alone, and it is not enough to put it on both hands, back, and buttocks on both hands and legs.I want you to put everything on it, such as double or triple.It's full of bamboo copters, and it looks like a hedgehog, but let's do it.It will take a lot of time to wear it, but it will be gaman ...

Well, I was thinking realistically, but my wisdom is unlikely to be a comfortable flight of the bamboo copter.I'm sorry, I'm sorry.

When he sees Doraemon in the work, he is flying comfortably with just one small bamboo copter, he is just groaning in the science of the 22nd century.