Aviation photographer, Katsuya Noguchi, will bother you from the sky Vol.16 "About Drone and" Wind ""

VOL.16 "About Drone and" Wind "" sentence ● Katsuya Noguchi (Hexamedia)

* This series is reprinted from the contents of the May 2017 issue.

Spring is the "wind" season.Although the energy of solar radiation is becoming increasingly stronger, the air condition is still flowing from the continent, and the condition of the atmosphere becomes unstable in the spring, and regular low pressure passes, and gusts are blown.It is easy season.I remember that the accident of the motor paraglider crashed by the sudden unstable wind was also in the early spring.

Drone is a type of aircraft that floats in the air by scratching the air with a propeller.Naturally, it is affected by the wind.Let's talk about how you can fly and stop the flight.

How much drone can you fly to the strength of the wind?

The strength of the wind is generally represented by the speed of the wind.In Japan, 3600 is applied to the speed of a second (the distance to one second [m]) to the general hourly speed (time x distance [km]).1m/s is 3.6km/h, 36km/h are 10m/s.The 10m wind per second can be read as the wind of 36 km / h.

I get a lot of questions, "How much drone can fly to the wind?"In the early drones, the performance of the controller that controls the motor and the aircraft was low, so the aircraft could be easily turned over in an unstable wind.At that time, the drone answered that the flight itself would be 7-8m/s or less, and 5m/s or less would be desirable for shooting.At present, there is almost no worries about the new model drone, except for large aircraft, suddenly turned over during the flight.If it is a flight alone, is it less than 10m/s, and the shooting is less than 7m/s?

風速は「m／秒（秒速）」で記載されるが、「km／時間（時速）」に置き換えるとイメージしやすい

▲ The wind speed is listed at the speed of seconds in Japan.If you apply 3600 to the speed of a second, you will get an hourly speed.If it is 10m/s, a 36km/h wind is blowing.Since driving of automobiles is written at an hourly speed, it will be easier to grasp the image by converting it to an hourly speed.

However, this is a story of drone abilities in the air, and is another story from pilot skills.The points that the pilots should be aware of in the actual flight are the behavior of take -off and arrival and advanced management.

At the time of take -by -step, the rotation of the propeller has not yet risen, or the ground and other obstacles are nearby, so the aircraft that wandered by the wind may contact them.If you need to fly under strong winds, take off using a no -wind area, such as a building or a large car.(2) Take off at once up to an altitude of the altitude.--- I think this is effective.

In any case, if you fly, we recommend that you look at the behavior of the aircraft for a while in the wind.In addition, hand catches and hand releases after properly taking safety measures are also effective.

The wind generally tends to blow stronger as the altitude increases.Even if it is about 7-8m/s on the ground, it is mostly blowing at 10m/s if it goes up 100m.If you feel that the wind speed near the ground is already close to the operation limit, do not increase the altitude.

Wind -resistant performance that is read from the specs seats

Here is a DJI Phantom4 Pro as an example.The spec sheet states 72km/h in Sport (S) mode with a maximum speed -oriented speed, 50km/h in P mode where GPS and obstacles work effectively.This is S mode 20m/s, P mode 13.It can be read as 9m/s.

In other words, if you fly in P mode in a 14m/s wind, it means that you will not be able to return to the point where you take off at the moment of flowing down a little.

As the word "average wind speed" says, the wind is not blowing at a certain speed.Wind speeds may increase due to the terrain and buildings.Considering such things, I think that half to 2/3 of the performance announcement speed of each mode will be a guide for the operation limit in the air.

In addition, the publication speed is the limit in terms of "flying", so it should be considered depending on the skills whether the gimbal can blur in the wind or do aerial photography as intended.

Propeller guard and wind

Proper guards are safe in low altitude shooting in low altitude shooting indoors without wind and weak winds and many obstacles.However, if a general propeller guard, that is, a shape that is easy to receive the wind in a distant place from the center of gravity, is in four directions, it is a factor that itself receives the wind and makes the aircraft unstable.I think it may be.When the wind is strong, removing the propeller guard may be more stable the aircraft, reducing the risk of crashing.

Wind speed changes due to terrain

Around mountain, cliffs, and large buildings in large buildings, the wind changes in the wind.On the wind side, the airflow rises and descends on the wind.And there is a vortex caused by turbulence.The change on the wind side is relatively calm, but the turbulence on the wind is sometimes intensely intense that the posture and altitude of the aircraft cannot be maintained.Drone pilots always need to plan, such as always paying attention to the strength of the wind, direction and terrain, and not approaching the wind.

Wind ... It is not visible to the human eye, but the changes caused by the wind are often visible, such as trees and branches and leaves.Although it is not easy to see like rainfall or sunshine, it is the most important factor in the weather in drone flights, so please foster eyes that do not overlook the change and keep a safe flight.

地形によって起こる風の変化に注意

▲ The wind is a kind of turbulence.If a strong wind hits a building or a tree, a vortex shown in the figure may occur on the lower wind side, the lower winds of the mountains.It is desirable to understand these characteristics before flying in places with mountains, valleys, and large buildings.