I brought this motor the internet(http://www.rcmodelland.com/)
G.T.POWER A6 Digital LiPo Li-polymer Balance Charger
Features
Optimized operating software
When charging or discharging, It has an 'AUTO' function that sets the feeding current automatically. Especially for Lithium batteries, it can prevent the over-charging can lead to an explosion by users fault. Every program in the unit is controlled with mutual links and communication for every possible error so it introduces a maximum safety. These can be set at users option.
Special recharge plugsport for receiver, transmitter and igniter charger. And for frequently used charger port such as multi purpose crocodile pin etc.
It provides most convenient balance charge port for Lithium batteries, with separated 3,4,5,6 charge port, and external reverse connector.
High-power and high-performance circuit
It employs the circuit that has maximum output power of 50W. As a result it can charge or discharge up to 15 cells of NiCd/NiMH and 6 series of Lithium batteries with maximum current of 5.0A. Furthermore the cooling system is so efficient that can hold such a power without any trouble of running the CUP or the operating program.
Individual voltage balancer for Lithium batteries inside
It has an individual-cell-voltage balancer inside. This does not require any extra balancer separately when charging Lithium batteries (Lilo/LiPO/LiFe) for cell voltage balancing.
Balance individual cells on discharge
It also can monitor and balance individual cells of the Lithium battery pack during the discharge process. If the voltage of any one cell varies abnormally, the process will be stopped with the error message.
Accept various types of Lithium battery
It can accept three types of Lithium batteries - Lilo, LiPo and LiFe. They have different characteristics by their chemistry. You can select any one of them that you are going to process before the job. For their specifications, refer 'Warnings and safety notes' section.
Lithium battery 'Fast' and 'Storage' mode
You can charge Lithium battery for special purposes. 'Fast' charge reduces the charging time of Lithium battery and 'storage' mode controls the final voltage of the battery to be suit for long time storage.
Maximum safety
Delta-peak sensitivity: The automatic charge termination program works on the principle of the Delta-peak voltage detection. (NiCd/NiMH)
Auto-charge current limit: When charging NiCd or NiMH at 'AUTO' current mode, you can set the upper limit of change current to avoid from high current charging. This is very useful when charging the low impedance and small capacity NiMH battery in 'AUTO' mode.
Capacity limit: The changing capacity always calculated by multiple of the charging current and time. If the charging capacity exceeds the limit the process will be terminated automatically when you set the maximum value.
Processing time limit: you can also restrain the maximum process time to prevent form any possible defect.
Input power monitor: To protect the car battery using as input power from being damaged the voltage of it always monitored. If it drops below the lower limit the process will be ended automatically.
Automatic cooling fan: The electric cooling fan comes into action automatically only when the internal temperature of the unit is raised.
Data store / load
For users convenience it can store maximum 5 data of different batteries. You can establish the data contains program setting of the battery to charge or discharge continually. These data can be called out at any time you need and the process can be executed without program setting.
Cyclic charging / discharging
Perform 1 to 5 cycles of charge>discharge or discharge>charge continually for battery refreshing and balancing.
PC based analysis using USB communication
For technical expert, it offers PC based program can analyze the characteristic of the battery by USB port. It shows a graph of voltage, current, capacity and temperature curves. It also shows the individual voltage of each cell in the Lithium battery pack.
This charger is computerized with a high performance microprocessor and specialized operating software. It can maintain your battery at its best condition and also control them safely. Please read this entire operating manual completely and attentively as it contains a wide of information you need to keep the manual in a safe place and be sure to pass it on to the new owner if you ever dispose of yours imax B5.
SpecificationsFeatures
Cell Balance and Charger in 1
The iMAX B5 Balance Charger has an individual-cell-voltage balancer built in so it does not need a separate balancer when charging Lipo batteries.
Maximum Safety
The automatic charge termination program works on the principle of the Delta-peak voltage detection.
Charge Time Limit
You can also set a maximum charge time to prevent any possible over charge.
Input Power Monitor
This function monitors the input voltage from your battery supply and will automatically stop the charge program if your battery falls below the required level.
If a Li-Po battery is stored with too low a charge, there is a risk of allowing the charge to drop below the battery's low-voltage threshold, resulting in an unrecoverably dead battery. Once the charge has dropped to this level, recharging it can be dangerous. An internal safety circuit will therefore open to prevent charging, and the battery will be for all practical purposes dead.
In circumstances where a second Li-Po battery is available for a given device, it is recommended that the unused battery be discharged to 40% and placed in the refrigerator or freezer to prolong its shelf life. Batteries should be allowed to completely warm to room temperature over up to 24 hours before any discharge or charge.
Storage Temperature | 40% Charge | 100% Charge |
0 °C (32 °F) | 2% loss after 1 year | 6% loss after 1 year |
25 °C (77 °F) | 4% loss after 1 year | 20% loss after 1 year |
40 °C (104 °F) | 15% loss after 1 year | 35% loss after 1 year |
60 °C (140 °F) | 25% loss after 1 year | 40% loss after 3 months |
This motor has high quality . It is suitable for my helicopter.^^
NiCads are the oldest generation of these batteries. They pack more power but are heavier than the NiMH. The NiMH voltage (power) tends to fall off fairly fast during the flight. The wonder batteries LiPos have great power for little weight and hold that power well throughout the flight. However, LiPos tend to be much more expensive than NiCad or NiMH. Again, go with the recommended battery, you will have time to experiment after you learn to fly.
Note that more cells in the battery means more voltage, which means more power.
Power (Watts) = Current (Amps) x Voltage (Volts)
There are some advantages of Brushless Motors:
l No brushes or commentator wear out
l Don't have to worry about cleaning the brushes or commutator. 
l There's no Friction from brushes to slow the motor down.
l Longer flight times and extended battery life due to the absence of friction from brushes.
l Much higher power to weight ratio!
How brushless motors work
Brushless RC motors work on the same principle as brushed motors, except the electromagnets(poles) are stationary and the permanent magnets are on the spinning portion of the motor.
Since the electromagnets are stationary, there is no need for brushes! The electronic speed controller(ESC) takes care of switching the voltage of the electromagnets.
It's important to know that a brushless speed controller and a brushed speed controller can not be used interchangeably. They perform completely different tasks.
The quickest way to tell the difference between a canned motor and a brushless motor is to count the number of wire leads. All brushless RC motors have 3 wires. Canned motors have 2 wires. The third wire is used for feedback. Switching any two of these wires will change the rotation of the motor.
Outrunners motor 
When we play RC Model , we will use different type of battery, for example,Li-polymer Battery ,Receiver Battery, Transmitter Battery, etc.
In a nutshell, a battery consists of two metals immersed in an electrolyte solution. A chemical reaction takes place that causes electrons to flow from one metal to the other. This produces a voltage difference between the positive and negative poles. When a load (such as a motor) is placed between the two poles, electrons will flow through the circuit until the metals are chemically neutralized (battery dead).Hope u have a greating and safe memory with playing Rc Model.
Do you know Hirobo S.R.B Quark 40MHz Electric Helicopter?
The S.R.B. Quark offers to those who have mastered hovering with the X.R.B. co-axial counter-rotating indoor electric RC helicopter, an even higher level of freedom of freedom of flight control, while the design ensures greater safety and ease of use.
The S.R.B. Quark employs a single rotor system, yet it has the main rotor and the tail rotor just like general helicopters, providing a more realistic helicopter style. At the same time, its design offers the most superior stability and excellent controllability among the single-rotor RC helicopters.
Although the S.R.B. Quark offers the most superior stability and excellent controllability among the single-rotor RC helicopters, due to the characteristic feature of a single-rotor helicopter, 
S.R.B Quark’s steering will feel more sensitive than co-axial counter-rotating helicopters like X.R.B, and it requires more stick operation to control take-off or pirouettes. Please read these instructions carefully in order to master the handing of this helicopter.
If you can master the S.R.B. Quark, you will have reached a level where even RC helicopters aimed at experts will be within your ability to control. We hope that this will be your first step into the wonderful world of RC helicopters.
I would recommend this model( Hirobo S.R.B Quark 40MHz Electric Helicopter)to anyone.
It's inherent stability give the pilot the opportunity to recover from various mistakes without necessarily crashing. However, in contrast to counter-rotators, the SRB exhibits single-rotor heli behaviors and flight characteristics, such as the ability to lean in pitch and roll axes and fly at significant speed. It also can fly in light wind.
The pilot has to work to fly the SRB: It CAN be crashed, but it is very forgiving. In my opinion, this is what makes the SRB such an optimal trainer and ideal "next heli" after learning basic piloting with a counter-rotator.
I think the Quark's design is very sensible. It's foam blades absorb crash impact and break, protecting the mechanical components. The included blade balancer is very cleverly designed and works perfectly. All that is required for blade balancing is common household clear tape which blends-away nicely on the foam blade material.
The Quark is quite pricey but, in my opinion, you get what you pay for. I've owned mine for about three or four weeks now and I've truly enjoyed it. All I've had to do is replace broken main rotor blades, and that process is simple and requires only a few minutes. So far, the model has proven to be durable and reliable.
There are some features about the Quark that I think should receive more attention. It has a very quite, brushless motor that provides good power to the main rotors. The tail rotor is driven by its own motor, but the motor is mounted at the opposite end of the tail boom from the tail rotor - inboard near the main rotor shaft. The heli also incorporates a fail-safe system to protect it if it flies too far away from the pilot. The motors shut down and bring the model down. It might crash, but at least you don't loose your expensive model.
As for negatives, there's little I would complain about with the Quark. I'd prefer that it used a 2.4GHz radio system (which Hirobo says they have no plans to produce). I've noticed what I believe to be a little interference during flight, even after using my frequency scanner to be sure my channel is clear. I also wish Hirobo would have produced the Quark with a heading-hold gyro instead of a rate gyro. I have found it impossible to completely eliminate mild left or right piro drift during hover, especially as the battery charge diminishes. Like my previous CX, the gyro adjustment is extremely delicate. On the other hand, during flight, it isn't terribly difficult to control the drift with mild stick inputs once the gyro is well adjusted.
In conclusion, I think the Quark deserves significant acclaim. With it, I am truly enjoying heli flight with minimal down time. For me, it serves as an optimal model for builing my flying skills and developing my sense of flight orientation. Training with my sim is very helpful, but the Quark takes training to the next level, giving me the hands-on experience my sim just can't deliver.
Today i wnat to teach you ho to choose a Right Brushless Electric Motor for your RC Airplane
Finding the brushless motor that is the best choice for your plane or helicopter can seem to be a daunting task due to the large number that are available. There are a few important considerations you should keep in mind when choosing. This article will help you identify these issues so you can spend more time flying and less time trying to find that “perfect” motor.
Ultimately, you want to swing a certain size prop at a certain RPM. In fact, the freedom you have in choosing propeller size and operating RPM can lead to huge performance gains over comparable glow motors used in many remote control airplanes. Prop and RPM selection determines how much power you need, it is important to choose a motor that is almost at its limits when running at that power level. A motor that is too small will overheat and ruin itself, a motor that is too large will be a detriment to performance, due to the added weight.
Translating propellor size and RPM into power requires some help. This help can come from a computer-based prop simulator. You can also find data posted by someone who has done what you are trying to do; find out what prop they used, what RPM it spun, and how much power was used.
Your list of potential motors should now only contain motors that can comfortably (but not ‘in their sleep’) put out the power you need. Now you’ll have to make decisions on the other things: battery voltage and capacity, direct drive or geared, outrunner or inrunner, and kV.
The easiest choice is whether to use direct drive or a gear box, so make that one first. If you want to turn high RPM (greater than 10,000 RPM) you’ll probably want a direct drive inrunner. For lower RPM, you can run an outrunner in direct drive or an inrunner through a gearbox. The outrunner motor is simpler and quieter, but the inrunner motor in a gearbox can be more adjustable and slightly more efficient. In some cases, the outrunner motor can be quite a bit cheaper. Each has its advantages, so consider them both.
At this point you know what RPM your motor needs to turn. It is either the same as you want the prop to turn(direct drive), or at a ratio faster than the prop when using a gearbox. Motor RPM is going to determine your specific motor and battery choice, by the following approximate formula (assuming lithium polymer batteries).
Motor RPM = 0.8 x 3.5V x Series Cell Count x Motor kV Rating
You need to select the right motor and battery combination that will satisfy the motor RPM formula. You can do it with a low kV motor and a high series cell count battery, or vice versa.
Lithium polymer battery packs are ideal for use with brushless motors in radio controlled airplanes and helicopters due to their low weight and high capacity compared to NiMH and NiCd packs. Along with a brushless motor and battery, you will also need a brushless speed control (ESC) with an amp rating equal to or greater than the peak current drawn by your motor.
Make your choice, order the parts, put them together.You want to make sure that you are near the RPM and power levels you were aiming for. Remember, though, the most important test is how it performs in the air. Fly it, and fine tune with prop selection. Hopefully this article has brought you close enough that a motor or battery change isn’t required.
Hope this information can help u~
in the last month , i brought a AXI Gold Line 4120/18 Outrunner Brushless Motor from rcecho.com.
It is very suitable for my helicopter. And it is powerful~~
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