Model aircraft non-toys, please abide by the laws and regulations and the Forum four proverbs! Safe Flight! *read different tutorial posts to get started faster* Play the model needs a calm heart , please do not read the hundreds of-page instruction manual or even the preparation of self-study foreign language, if you can not calm down to read, pondering, research, then the model of this hobby is not for you Posting is not easy, the top sticker easily, and look and cherish 8.17 Update: 3 Floor, what is the angle of entering? 1.if you want to enjoy the fun of flying, do not want to be installed, repair machine torture, and have a certain economic conditions, then the DJI Wizard is your choice. If you want to experience the double fun of flying and hands-on, or RMB is a problem, then do it yourself! 2. Use the Forum search function more than 3. In a word, saving money is expensive. Start with a picture that I took with the latest hand of the most cock wire configuration.equipment does not have to be more tall on, excellence is the kingly(This is the dark of Shijiazhuang Oh ~) <ignore_js_op>
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, basic 1. Theoretical Foundation first of all, you have to understand what you're going to do-the four-axis aircraft works. Four-axis aircraft is roughly composed of the following parts (recommended to Baidu Encyclopedia search for more detailed explanation) ① frame: aircraft skeleton, carrying a variety of equipment ② flight control: The brain of the aircraft, carrying accelerometers, gyroscopes, barometer, compass and other sensors. It controls the speed of the four motors and then controls the attitude of the aircraft. Or with GPS to complete fixed high-point homing and other functions. Its essence is monolithic microcomputer. Common flight control has xaircraft SuperX, DJI Naza wkm a2, zero-x4 Gemini, APM, MWC, QQ flight control, CC3D and other ③ ESC: The Universal electronic governor, its input is DC, usually by 2-6 lithium batteries to power. The output is three-phase AC and can drive the motor directly. In addition, the model brushless electronic governor also has three signal output lines for receiving receivers. The signal line can lead to a stable 5V voltage and can normally be powered by 2-4 servos. Aviation model is to adjust the aircraft's various flight posture and movements by remote control of the brushless electronic governor. ④ Brushless Motor: A rotating magnetic field is generated by a three-phase alternating current to drive the rotor rotation. It has the characteristics of wide speed regulation, small volume, high efficiency and low steady-state speed error. The brushless motor KV value is defined as the rotational speed of/V, which means that the input voltage is increased by 1 volts and the idling speed of the brushless motor increases. But for brushless motor does not just explain the motor speed and voltage into a strict linear proportional relationship, see Baidu Encyclopedia ⑤ Remote Control, receive: As the name implies &NBSP;Q: What is the United States hand, Japanese hand? a: The position of the throttle on the remote is the Japanese hand on the right and the American hand on the left. Personal recommended American hand, left hand control throttle and steering, right hand control aileron and pitch, more in line with the cognitive Law Q: What are the channels? a: Channel is a remote control of the action, such as four-axis need to control the throttle, steering, pitch, roll four action, then you need a minimum four-channel remote control ⑥ Battery: Lithium, different from the common lithium battery, The biggest feature is the high discharge magnification Q: What does the few s on the battery mean? A: A few S is a series of several pieces, such as 3s2200mah is 3 pieces of 2200mAh battery series, rated powerPressure 11.1V, because the aircraft's power is large, so we need to increase the voltage to reduce the current heat loss (Q=I2RT). And because we use lithium batteries in series, so we need to balance the charger, referred to as balance charge. is in order to charge each piece of battery voltage to a level to prevent over-charging, lithium battery is very delicate, so we usually use the battery has a protective plate to prevent over-charging, but the general protection plate can not withstand such a large current, so in daily use must use balance charge. Q: What does a few C on the battery mean? A: Discharge magnification. Refers to the current value required for the battery to emit its rated capacity within the specified time, which is equal to a multiple of the battery's rated capacity in the data value, usually denoted by the letter C. For example 3s2200mah 20C, then its maximum discharge current is the 2.2*20=44a⑦ charger: that is, the balance charge. Each piece of lithium battery can be charged to the same voltage. Some also have the function of discharging, measuring internal resistance, plotting discharge curve, and so on, how does the four-axis aircraft move? (Map with "Ten" mode for example, from Baidu Encyclopedia) figure (a), because there are two of the motor steering opposite, can be balanced against the fuselage of the reverse torque, when the increase in the output power of four motor, the rotor speed increase so that the total tensile strength, when the total tensile force to overcome the weight of the whole machine, the four-rotor aircraft will rise vertically from the ground; , while reducing the output power of four motors, the four-rotor aircraft descend vertically until the balance is reached, achieving vertical movement along the z-axis. When the lift generated by the rotor equals the weight of the aircraft, the aircraft remains hovering. The key to vertical motion is to ensure that the speed of four rotors is increased or decreased synchronously.
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In figure (b), the speed of the motor 1 increases, the motor 3 speed decreases, the motor 2, the motor 4 speed remains unchanged. In order not to cause the change of rotor speed, the overall torque and total pull of the four-rotor aircraft, the rotor 1 and the rotor 3 rotational speed change the size should be equal. Because of the lift of the rotor 1, the lift of the rotor 3 is reduced, the resulting unbalance torque to rotate the fuselage around the y-axis (direction), in the same way, when the motor 1 rpm, motor 3 of the speed rise, the fuselage will rotate around the y axis to another direction to achieve the aircraft's pitching movement. Roll in the same vein.
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The yaw motion of a four-rotor aircraft can be achieved by the reverse torque generated by the rotor. Rotor rotation process due to air resistance will be formed in reverse direction with the reverse torque, in order to overcome the impact of anti-torque, can make four rotor two positive rotation, two reversal, and the diagonal of the next year each rotor rotation direction is the same. The size of the counter-torque is related to the rotor speed, when the speed of the four motors at the same time, four rotors produced by the reciprocal torque balance, the four-rotor aircraft does not rotate; when the speed of the four motors is not exactly the same, the unbalanced counter-torque causes the four-rotor aircraft to rotate. In figure (d), when the speed of motor 1 and motor 3 increases, the motor 2 and motor 4 speed decreases, the rotor 1 and the rotor 3 to the fuselage of the reverse torque is greater than the rotor 2 and the rotor 4 to the fuselage of the reverse torque, the fuselage in the role of surplus counter torque around the z-axis rotation, to achieve the yaw movement of The motor 3 turns opposite.
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In order to realize the motion of the aircraft in the horizontal plane, it must exert some force on the aircraft in the horizontal plane. In the figure (e), increase the motor 3 rpm, so that the tension increases, correspondingly reduce the motor 1 rpm, so that the tensile force is reduced, while maintaining the other two motor speed unchanged, the reverse torque is still to maintain a balance. According to the theory of figure (b), the aircraft first has a certain degree of tilt, so that the rotor force to produce a horizontal component, so that the aircraft can achieve the forward-flying motion. Flying backwards is just the opposite of flying forward. Of course, in figure (b) Figure (c), the aircraft produces pitch, tumbling motion along with the horizontal movement of the x and Y axes.
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2. Tool base in order to reduce unnecessary costs, we recommend that you buy the following tools and consumables: soldering iron, stripping pliers, cutting line lead (ordinary pliers can't hold so thick silicone line), a set of hex, screwdriver set (domestic South flag, very cost-effective!) ), small Vice, parts box (I know TB has a very cheap need can pm me), horizontal bubble, heat shrink tube (4mm and 5mm with more, other see), BB Ring (Small things easy to lose buy a few bar ...) ) Welding method I put a video here,Suitable for weldingBeginner's starter, you can also cool search the welding tutorial. Because all four-axis aircraft are operating at high currents, reliable soldering is important
Second, the equipment to buy most of the models do not have a local model shop, so TB is the main battlefield, it must not be cheap to the unknown shop to buy, buy counterfeit goods (motor ESC mostly), after all, the sky flying Things, Security most important This post recommends a set of configurations that are best for beginners 1. Flight control: QQ Flight control, there is self-stability, simple commissioning, cheap. or nazalite can be. Naza users notice, in the Assistant software to turn off the low-voltage protection, otherwise you will find the flight time greatly reduced, directly with BB ring set 3.6V alarm. If the novice can not skilled landing that set the 3.7V alarm, the alarm can support 2 minutes or so 2. Motor: 2212 KV980 recommended Sunnysky A2212 (with more people, cheaper, good after sale) Yinyan 2212 (new, Looks good). Come out to fly, always want to fry, do not buy too good, first with cheap equipment practice technology. But Xxd really does not recommend 3. ESC: If there is no plan to upgrade the large motor, good surplus Skywalker 20A is enough. You can also brush the Blheli firmware and finish the platinum explosion. If you want to one step can be in platinum 30A or Lotte (X-roter) bar. But not yet listed ... Not recommended four unity, the bad one can not be used 4. Paddle: 8 Yuan a pair of imitation APC1047, do their own balance. Or 1045 is OK. First Direct Buy at least 10 pairs, believe me, novice most prone to bad oars. Otherwise the postage is more expensive than the thing is not worth 5. Rack: can be used imitation F450, cheap, fried not distressed. Beginners do not have a tripod, easy to turn when landing. Or do their own, recommended aluminum square tube material, cheap and anti-blast light. can refer to my shelf 6. Remote control: Recommended one step, no money with Walkera D10 or heaven and earth fly 9. Have money to use Futuba. Do not want to one step words to fly 7, do not buy heaven and earth fly 6, too pit, out of second-hand no one to plunges particularly fast, days seven plunges also slowly 7. Charger: Recommended one step, do not buy B6, is a pit. The worst is UNA6.8. Battery: This set of equipment with 3s2200 25C Flower card good, quality after sale are passable, is small expensive. Damp seems to be OK. Not recommended. Have a hands-on ability to buy their own group of batteries (battery buy about 3 pieces of it)
I recommend a set of inexpensive and easy to use for beginners reference
Sunnysky A2212 QQ flight control Skywalker 20A damp 3s2200 25C imitation APC 1047 imitation 450 rack heaven and earth flying seven imaxB6 if there is a plan to upgrade later, switch to Sunnysky A2212 QQ flight Control (APM also line, do not want to adjust the trouble that directly One step with NAZAv2 zero X4 what) Platinum 30A (if confident brush blheli that Skywalker 20A or 30A) damp 3s2200 25C Imitation APC 1047 remote control with D10, Day 9, Futaba charger UNA6 or better rack with X525 X6 00 or something. |
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