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Q: Don't know what helicopter is suitable for me to start learning?

A: The best choice for entry learning is a helicopter with a coaxial double paddle structure, which has the best self-stability and slow flight speed, and can be called a trainer in a helicopter! Such as K170. You can also choose a small class model of the traditional main rotor + tail rotor structure, which has faster flight speed and wider flight airspace, but try to choose products with better stability performance! Like from RC Xperts.

Q: How high and how far can the model helicopter fly?
A: Because the higher the altitude, the lower the air density, so the flight height of the helicopter is generally much lower than that of the fixed-wing aircraft, and even this has been far greater than our visual control distance and remote control distance, so it can be said that the flight height and flight distance of the aircraft is determined by the safe remote control distance and visual distance of the remote control equipment. Especially small aircraft can generally fly at a height of more than 20 meters (about 5-6 floors).

Q: How long can the model helicopter stay in the air?
A: The length of the flight (idle time) is mainly determined by the power system. Such as the size of the electric motor power used by the electric helicopter and the voltage and capacity of the battery carried, the engine displacement used by the oil helicopter and the fuel volume carried. Generally, whether it is electric or oil drive, the blank time after charging or refueling is about 8-20 minutes (according to the actual product specifications). One is the limitation of energy weight, and the other is to avoid the transition fatigue caused by the operator's high concentration for a long time.

Q: Why are helicopters so difficult to fly, not as good as expected?
A: Mainly due to two reasons: 1. The self-stability of the helicopter can not be compared with that of the fixed-wing aircraft. In addition to the helicopter with the coaxial propeller structure, there is no helicopter that can float stably in the air for a long time without control (generally within 10-20 seconds it will lose its balance and fall to the ground), so it is necessary to maintain a high degree of mental concentration at all times! 2. Because beginners have not formed a conditioned reflex for the direction of control in the brain at the beginning, they often give the plane wrong action instructions through the transmitter when the plane is in a certain flight attitude, or even a blank brain, and the plane cannot give the operator enough time to correct it, resulting in a crash! With the right practice, you can control it! You can also use a computer simulator to complete the exercises in the beginning.

Q: Why do helicopters take off to the left or elsewhere instead of straight?
A: Due to the gyroscopic effect and the influence of the downwash flow of the main rotor, it is normal for the helicopter to lean to the left when taking off! It is necessary to hit the aileron lever slightly to the right (right hand horizontal lever), and not adjust the aileron fine-tuning by observing the left and right side movement of the body after a stable hover. If the deviation is in the other direction, it can be corrected by fine tuning while on the ground.

Q: What is hovering and why should I practice hovering?
A: Hover is a unique mode of helicopter flight is also the charm of helicopter flight! As the name implies, the helicopter stays almost stationary in the air at a certain height, so that it can complete the tasks that ordinary fixed-wing aircraft can not complete! For beginners, it is necessary to start from the practice of hovering flight, because the takeoff and landing of the helicopter, and the beginning and end of some other flight actions need to first enter the hovering flight state. So hovering became the basic exercise subject of helicopter flight!

Q: What is the common cross disk control mode? What is the CCPM Cross Disk control mode? What's the difference between them?
A: In the ordinary mode of cross disk control mode, the action of the aileron is only completed by the aileron steering gear, the lifting action is only completed by the lifting steering gear, and the change of pitch is only completed by the pitch steering gear, and the three steering gear perform their own duties. CCPM mode cross plate control mode, each action of the cross plate is completed by three steering engines at the same time. For example, the change of pitch, the three steering gear push and pull the cross disk up and down at the same time, the action of the aileron is completed by the aileron and the pitch steering gear at the same time 1 push and 1 pull, and the lifting action is completed by the lifting steering gear and the 1 push and 1 pull completed by the aileron and the pitch steering gear.

From the above difference, comparing the difference between the two, the ordinary mode has a higher torque requirement for a single steering gear, because a single action only has 1 steering gear output, while CCPM has at least 2 steering gear output for any single action, so the torque requirement for the steering gear is lower. However, CCPM has high requirements on the performance consistency of the steering gear, and the stroke and speed of the steering gear should be the same as possible, otherwise it will cause deformation of the action, such as when the pitch changes, the three steering gear are the same up and down, if the stroke is not the same, it will cause the cross plate under the different pitch is uneven and inclined. If the speed is not the same, it will also cause uneven cross plate in the pitch change!

In terms of flight performance, there is no difference between the two for beginners. For the lightweight equipment of electric helicopters, CCPM is required to have more weight and action strength advantages, so if the 3D flight CCPM will show obvious advantages! The normal flight CCPM is also more stable.

Q: What is pitch?
A: Pitch is the distance (in theory) by which the rotor or fixed-wing propeller of a helicopter rotates once, 360 degrees, up or forward. Just like a screw, you can screw in a circle after the length of the screw. The greater the pitch, the greater the distance, the less! However, it is difficult to measure the actual size of the pitch, so the diameter and the size of the pitch (in inches) will be marked on the propeller of the fixed-wing aircraft with the same pitch, so as to facilitate the use of the appropriate engine. The vast majority of fixed-pitch helicopter OARS are generally customized for a certain class of aircraft, so only the diameter is indicated. Variable pitch helicopters can easily measure the size of the pitch by measuring the Angle of attack (windward Angle) of the blade to reflect the size of the pitch, and the amplitude of change.

Q: What is a variable range helicopter?
A: Variable pitch refers to a helicopter whose pitch can change with the throttle. There are many advantages over fixed pitch helicopters! In simple terms, it has higher power efficiency, higher main rotor speed, more stable and not afraid of airflow (can fly smoothly in a strong wind or even a wind of more than 5), more agile response, if the use of 3D main rotor (double convex symmetrical airfoil main rotor), you can get 3D flight ability (roll, stall reverse, stall reverse). Reverse flight actions like Align Trex and Black Hawk 3D helicopter).

However, compared with the fixed pitch helicopter, the variable pitch mechanism is complicated, the debugging and maintenance is difficult, the remote control equipment is demanding, the power system is demanding, the body is large, and the destructive power is large. So for entry, a small fixed-pitch helicopter with superior performance, such as Lama-2 or Cupid II, is more suitable!

Q: Why should the propeller be balanced before use?
A: Static balance mainly refers to the weight of the two to be consistent, dynamic balance mainly refers to the center of gravity of the two to be consistent! For example, we all know the power of the bullet, in fact, the weight of the bullet is only about 20g, its power comes from the high speed of more than 700m/s, high speed gives him great kinetic energy! The linear speed of the outermost edge of the high-speed rotating propeller can reach more than 60m/s(200km/h)! The high kinetic energy can not be ignored. At such speeds, the difference in kinetic energy generated by different weights is also very large, causing huge vibrations! If the weight is the same and the center of gravity is different, the kinetic energy at the same radius (concentric circles) will also be different. So we must ensure the balance of the propeller!

Q: What is double sculls?
A: Double sculls refers to two or more blades in rotation, one high and one low is not in the same rotating plane! The tip of the paddle is like an open blade of scissors. Double sculls are caused by the difference in pitch of two or more OARS (the difference in lift, which is done after the dynamic/static balancing of the two OARS). As long as different marks are made on all blade tips and one of them is used as the benchmark, and then the other blades are located on the upper or lower part of the benchmark blade when rotating, the pitch (Angle of attack) of the other blades can be slightly adjusted and observed again, such as the observation of less than one high and one low two rotating planes has eliminated the double paddle. The sculls cause strong vibrations and must be eliminated!

Q: How do I install ailerons (stabilizer fins)?
A: The installation of the two ailerons should be completely without Angle, that is, 0 degrees!

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