| Product Type | Rc Helicopter |
| Size | 26x17x13cm |
| Weight | 22/25kg |
| Material | Plastic |
| Scale | 1:12 |
| Power | Battery |
| Speed | 8km/h |
| Package | gift box |
| Plastic Type | ABS |
| Certification | ASTM, EN71, ce, CCC |
| Color | Red, blue |
| Style | Radio Control Toy |
| Max Speed | 80km/h |
| Playing time | 20-25 Minutes |
| Packing | Color Box+Carton |
| Feature | sticks should be |
Helicopter structure:
Model helicopter rotors mainly include symmetrical rotors and asymmetrical rotors. Symmetrical rotors refer to rotors that use symmetrical airfoils, which are mainly used for 3D flight. The common unequal-distance rotors are mostly symmetrical rotors. Asymmetric rotors include all equal-distance rotors, and many unequal-distance rotors used for F3C flight are also asymmetric rotors.
The dynamic and static balance of the rotor
Static balance mainly means that the weight of the two sticks should be consistent, and dynamic balance mainly means that the center of gravity of the two sticks should be consistent! For example, everyone knows the power of a bullet. In fact, the weight of a bullet is only about 20g. Its power comes from a high speed greater than 700m/s. The high speed gives him great kinetic energy! The linear velocity of the outermost edge of the high-speed rotating propeller can reach more than 60m/s (200km/h)! The high kinetic energy cannot be ignored. At such a speed, the difference in kinetic energy produced by different weights is also extremely large, causing huge vibrations! If the weight is the same but the center of gravity is different, the kinetic energy that appears on the same radius (concentric circles) will also be different. Therefore, the dynamic and static balance of the propeller must be ensured!
Scull
Double propeller means that when two or more blades are rotating, one high and one low are not on the same rotating plane! The tip of the oar is like an open scissors mouth. The double propellers are caused by the different pitches of two or more propellers (the lift is different, this is after the completion of the dynamic/static balance of the two propellers). Just put different marks on the tips of all the blades and use one of them as the reference, and then observe whether the other blades are located on the upper or lower part of the reference blade during rotation, and then you can fine-tune the blade angles of the other blades and observe again, such as It is not observed that the two rotating planes, one high and one low, have eliminated the double propellers. The sculls will cause strong vibrations, which must be eliminated!
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