The 4 best mini FPV quadcopters

1. Eachine QX90

The QX90 is a bind and fly quadcopter, is uses a F3 based flight controller, and has an all in one FPV camera and transmitter. Included with the QX90 is one of 3 receivers, compatible with either FRsky, Spektrum, and FlySky (frsky receiver is only compatible with international firmware and not the EU LBT firmware). Driving this quad are some 8.5x20mm motors which produce impressive power making this quad powerful enough to fly outdoors in the wind! The kit also includes two batteries which is great to get more flying done per session. The frame itself is made from a single piece of carbon fiber so the frame itself is very strong, however the main weakness is the FPV antenna which takes most of the abuse when you crash upside down. However there is an optional FPV antenna protector for it that you can buy. At around £60 / $69.99 the QX90 offers alot of fun for indoor and even outdoor FPV flying. This is currently my favorite goto micro FPV quadcopter.

QX90 Specifications

·Price: About £60 ($70) Nov 2016

·Size: 90mm

·Weight: 39g (without battery)

·Size: 11811870mm

·Flight controller: SP RACING F3 EVO Brushed

·Firmware version: Cleanflight 1.13.0

·Motor: 8520 Brush Motor

·Prop Size: 55mm

·Receiver: Built-in Frsky or FlySky compatible 8ch SBUS/PPM receiver

·Camera: 520TVL HD CMOS 1/4 inch Camera

·AV Wireless Transmitter: 5.8g 25mw 32ch

·Battery: 3.7V 600mah Lipo battery

·Flight time: 5-6 minutes

2.Skylark M4-FPV250 Mini Racing Sport Quadcopter

This is very popularmini racing sport FPV quadcopter, most people are choose this FPV as their racing FPV.

Specification:

Weight: 395g (without battery)

Total Weight: 554g (with 3S 2200mAh battery)

Flying Time: 10min (with 3S 2200mAh battery)

Suggest Battery: 1300mAh 3s lipo battery

Package Includes:

1 x FPV250 Racing Quad Frame 

4 x MT1806 Brushless Motors(2 CW + 2 CCW)

4 x 12A ESC 

4 x 5030 Propellers (2 CW + 2 CCW) 

1 x RC Transmitter (6-channel)

1 x RC Receiver (6-channel)

1 x 5.8G 600mw Video Transmitter

1 x 5.8G Receiver (Optoinal, need to be purchased separately)

3. Fire 104

If you are looking for something a little bigger and only use spektrum R/C gear, then the fire 104 is a great option. Because the frame is abit bigger it means that the FPV gear is better protected (and it looks abit cooler). Also you can upgrade the motors to use bigger props if you need more power. However despite the bigger size, the weight of the Fire 104 is still very low at just 37g (without battery). Powering this quad is the Micro Scisky 32bits Brushed Flight Control, while old is still fully capable. It uses an older F1 chip (which is pleanty good enough for micro quadcopters), and the best thing is that it has a built in Spektrum DSM2 receiver, which is why the fire 104 is so light. The only downside is that the FPV transmitter is only 16CH and it only uses a linear antenna which is not quite as good as the circular polarized antennas on the QX90 and QX70. But the camera does have a higher TVL resolution, but with a cheap antenna this will not be very noticeable, especially when you start to fly further away so that is something you will want to upgrade, although it will require some soldering.

Fire 104 Specifications

·Price: About £100 ($120) Nov 2016

·Wheelbase: 104mm

·Weight: 37g (not included battery)

·Propellers: 55mm

·Flight controller: NAZE32 (Open source CleanFlight/BaseFlight)

·Motor: 8520 Brush Motor

·Built-in Receiver: Compatible with DSM2 7CH

·ESC: Built-in Brush ESC

·AV Wireless Transmitter: 5.8G 16CH 200mw

·Transmission Distance: 500-800m

·Camera: 650TVL 170° CCD 720X576

·Batterry: 3.7V 700mah 25C Lipo battery

·Flight time: about 8 minutes

4.RND Indy 250+ Racing quad-copter

Frame Type: Quad-copter

Frame Size: 250mm motor-to-motor

Frame Material: Carbon fibre

Frame Manufacturer: RCTimer

Folding or Fixed arms: Fixed

Flight Controller: OpenPilot CC3D

Motors: RCT HP1806 - 2300KV

Propellers: Nylon 5x3"

 Description

The Transmitter-Ready RND Indy 250 is a carbon fibre frame quad-copter specifically designed for Racing.

Please note that the camera and 5.8GHz transmitter are not included in the price. The FPV200 set may be purchased separately (below) and we will be happy to fit and test.

All you require is a suitable RC transmitter and receiver and a LiPo battery. It is fitted with green and red directional LEDs and comes with 18 pairs of spare propellers. The fully tune-able OpenPilot CC3D flight controller is pre-installed as are the high speed ESC's.

The carbon fibre frame is extremely light with powerful 2300kv motors and is built to easily fit FPV camera and transmitter.

Maximum distance between motors: 250mm

Motors: Rctimer HP1806 2300kv (pre-installed)

ESCs: 20A OPTO BLHeli (pre-installed)

Pre-tuned CC3D OpenPilot flight control system

Extremely durable carbon fibre construction

PCB/PDB base with 5V and 12V output pins

Plastic composite 450 helicopter style landing gear

FPV Dual 45degree Receiver Antenna Mount

4 pairs Green 5x3", 4 pairs Red 5x3", 5 pairs Orange 5x3" and 5 pairs

Black 5x3" Nylon Propellers

Weight: 263g

Required but not included:

5 or 6 channel RC transmitter & receiver.

1300-2200 3S LiPo battery.

Battery strap.

Those 4 FPV quadcopters are the best mini FPV quadcopters, just I think, if you have some other tips, you can share for me.

Gensace and Tattu official shop Black Friday Battery sale

How time flies! The year of Black Friday is coming on. In that day, most of people will purse their like goods, on offline, the shopping malls make a big discount this year. On online, most of merchants will also take a great save, as the Gens ace and Tattu official online shop, we make a big saving too. And last some days start from now on end to 29th.
We provide a few of ways to saving. Such as just to share and get extra 10%, and have a chance to win the order for free and win the bag of Gens ace and Tattu accessories. For the all lipo battery, we also have up to 40% off. There is a big sale for this year.

1.Share the our Black Friday battery sale section page on Facebook, and you will get extra 10% off.
2.Shop anything now for a chance to win your entire order for Free. And also you will win a bag of Gens ace & Tattu accessories.
3.Black Friday & Cyber Monday battery sale, up to 40% off. It is a big sale of this year.
And this discount will ends November 29th ,while the stock lasts.
For the convenient to choose our hot sale product, we also divide the section of all Gens ace and Tattu lipo batteries. Such as below:

RC Car Lipo Battery Sale Section:
http://www.genstattu.com/black-friday-rc-car-battery.html
RC Airplane & Heli Battery Sale Section:
http://www.genstattu.com/black-friday-rc-airplane-heli-battery.html
Drone/UAV Battery Sale Section:
http://www.genstattu.com/black-friday-drone-uav-battery.html
FPV battery Sale Section:
http://www.genstattu.com/black-friday-fpv-battery.html
You can according to products you want enter the right page. Save your search time. If you are interesting in Gens ace and Tattu, you can click:
http://www.genstattu.com/blackfriday

https://www.youtube.com/watch?v=yF4cYzfWTRQ

At present, lipo battery becomes the mainstream of model airplane batteries. In everyday usage, we probably need to use three steps (recharge, discharge and maintaining). Today, I will tell everybody the right way of using the RC lipo battery from three aspects.

Recharge

When you have a lipo battery, you are in no hurry to recharge, but read the battery specification carefully first. Recharge current, voltage and temperature can not be greater than the standard of the specification. What could happen if they are higher than the standard.
1.Using batteries higher than recommended current may cause problems of the battery discharge performance, mechanical property and the safety performance, and may cause heating and leakage, can greatly reduce the battery life.
2. Recharge voltage higher than recommended voltage may cause cell overcharged, usually caused by using in wrong charge way. (Like direct current charge)
3.The recharge temperature here is not the temperature caused by recharging but the environment temperature during the process of recharging. When you find the surface temperature anomalies, you should immediately end the charging.

Discharge

1.Discharge current

Discharge current should not exceed the maximum discharge current specified by the battery. (Formula is "the number of milliampere divided by a thousand and then times the number C" equals the maximum discharge current).

2.Discharge temperature

The battery must be discharged at the range of temperature specified by specification. When the surface temperature exceeds 60 degrees, should stop using, until the battery cool down to the room temperature.

3.Over discharge

Over discharge can cause fatal effect on the battery, so it is best not to make monomer battery voltage lower than 3.7 volts.

Battery storage

Battery should be stored in a cool environment. When you store battery for a long time (more than three months), suggest you put battery in the temperature of 10 to 25 degrees and low temperature, non-corrosive gas. The process of long-term storage, charging and discharging once every three months to keep the battery active, and ensure voltage in the range of 3.8 volts.
Finally, if you don't mean to use a battery in the short term, be sure to remember that do not charge it fully before you keep it. This is to prevent the battery bulge in the process of preservation. The best maintaining method is storage. The voltage is monomer 3.8 volts

Gens ace most popular RC car Battery 5000mah 2s Lipo

Gens Ace is one of the top rank battery corporations with deep research and manufacturing on NIMH, LI-PO, LI-FE by the effort of 200 professional engineers and technicians with 20 years exquisite battery technology. The Gens Ace brand holds the traditional concept of "excellent quality", "Optimization"& "Priority" on Sales & Services. All batteries are tailored for various scales of the RC Models such as electronic cars, Nitro cars, Aero planes, vessels and also other models, toys, electric tools, electric bikes, electric autos, digital products etc.

Fits:

The reliable power for 1/8 and 1/10 rc car hobby such as: Losi, Traxxas Slash, HPI Strada XB 1/10 RTR Electric Buggy, Team Associated, Axial, Tamiya, Duratrax, Jammin', Redcat Racing, Exceed RC, ElectrixRC, Emaxx, Bandit, Rustler version, Kyosho GP 4WD Racing Truck etc.

Features:

1. Quickly Recharged, 5C fast charge capable.
2. Long cycle life with 150 times minimum, up to 200Wh/kg energy density
3. Production in the most strict single cell capacity, voltage, resistance, discharge curve matching process.
4. Superior Japan and Korea Lithium Polymer raw materials.
5. Local after-sales service(located in Dublin, CA)

Specifications:

Minimum Capacity: 5000mAh
Configuration: 2S1P / 7.4V / 2Cells
Discharge Rate: 50C
Max Burst discharge Rate: 100C
Net Weight(±20g): 304g
Dimensions: 138.5mm Length x 46.5mm Width x 25.9mm Height
Connector Type: 4.0mm bullet to Deans
Wire Gauge/Length: 12#/100mm
Charge Plug: JST-XHR
Discharge Plug: 4.0mm bullet to Deans
Original price: $36.99 Now: $26.99

See more about 5000mah 2s lipo battery photos:

Source: http://www.genstattu.com/blog/gens-ace-most-popular-rc-car-battery-5000mah-2s-lipo/

Scary disconnect experiece of players when they are playing their drones

Scariest experience to data, thought I had lost the bird.  Had it about 3000' away and coming back my way when everything suddenly disconnects.  Cannot use any features of the DJI app on my iPad air that has never given me problems.(I used a DJI drone with 2200mAh lipo battery)  I've had some tense moments in the past, so I know enought not to panic and to think things through.  I press and hold RTH button on the remote.  Nothing.  No blinking white light.   I'm afraid to close the app.  Should be noted that I'm not on wifi and there is no cached map.  I do see the birds heading in the lower right corner of the screen.  It seems to be moving.  After the initial disconnect I made sure not to move the bird.  I think I should be still pointed towards home.  I can hear nothing, I'm all alone on a hillside overlooking a medium sized lake.  No noise.  I push the stick forward to hopefully move the bird in my direction.  I hear a very, very faint buzzing.  Its getting louder! Yes!  I finally spot it and bring it to me for an immediete manual landing.  App never reconnected.  I was happy to have it backed and not in the mood to troubleshoot at this locale.  I know I need to update firmware but thats been pending for months with no issues.  WTH.  
I thought for sure the bird was gone.  Was shocked to get it back.  Have no idea what went wrong!  That's the hardest part.

I had a similar experience, I had my drone out over 2 miles when my app crashed. I flipped the S2 switch a couple of times, I heard the beeping sound, and then it quit. I flipped it again, and it started beeping again. I eventually got the Litchi app going again, and saw that my bird was on its way back. I test my RTH every once in a while by just shutting everything off, waiting a few secs and she just starts to fly back. I wonder if you had just shut your TX off if it would have just come back? Are all of your settings right? Is it set to hover instead of RTH? After viewing the footage, when the app crashed, I see myself stopping the forward motion and activating the RTH. Why the beeping stopped I have no idea, it just kept coming home. 

How to choose RC lipo battery?

With the development of participation in playing aeromodelling, hobbyist has paid more and more attention on the selection of the RC lipo battery. For the selection of the RC lipo battery, it carries on the explanation mainly from two aspects of battery's voltage and capacity:

1. Voltage of battery

Its voltage should be the same or a bit higher than the voltage of electric motor.

2. Capacity of battery

Unit of the battery capacity is AH, and there is the larger capacity and the larger size under the same voltage. For example, the electric motor has the working current of 10A and the voltage of 12V, which is 10A*12V= 120W. If equipped with the 12V/10AH batteries, the electric motor can work for an hour. If the rated working current of the 120W/12V DC motor is about 10A, its battery capacity is 40Wh when it works as the maximum power of 120W for 20 minutes, and the capacity required for the battery pack is about 12V4Ah, and the equipped lithium battery is power-type battery.

Structure of lithium battery

Usually, lithium batteries have two common types of shape, including cylinder shape and square shape. It is used the helical coiling structure as the internal of battery, and made intervals between the positive and negative electrodes by a kind of polyethylene film isolation material with high intricacy and strong permeability. The positive electrode is the current collector composed of lithium cobalt oxide and aluminum foil, and the negative electrode is the current collector composed of graphitized carbon material and copper foil. Battery is filled with organic electrolyte solution, and installed with safety valve and PTC components, in order to protect the battery from damage in abnormal conditions and when the output is short-circuited.

Why is lithium battery so popular?

1. High voltage and light weight features of lithium battery

The average voltage of a single battery can reach 3.7V or 3.2V. If customer requires the battery with the qualified voltage, lithium battery is the best choice as it can be composed of a lithium battery pack easily and provide convenient and efficient access to improve the voltage of lithium battery.

2. Compared with other battery, lithium battery has higher capacity and density

Lipo battery has high energy storage density, at present, density of the common used battery can reach 450-620Wh/kg, which is 5-7 times higher than the lead-acid battery. In addition, pollution is one of the most important problems considered when people prefer to use lithium battery.

3. Large capacity and long life

The weight of a single lithium battery is about 5-6 times of the lead-acid battery. Although there are less differences in weight between the lithium battery and polymer lithium battery, people prefer to choose the lithium battery as its capacity and life.

The service life of a single lithium battery can be above 6 years and even 9 years if nothing goes wrong. The normal quantity of use is more than 1000 times, if there are no accidents, it can be used beyond 1500 times.

4. Low self-discharge and no memory effect

Lithium battery is equipped with protection plate during the production, which can make the lithium battery have an effect of over-charge and discharge. As lithium batteries have high power tolerance, lithium batteries used for electric vehicle can produce high-performance charge and discharge of 15-30C for the high-strength acceleration performance in starting of the electric vehicle.
source: http://www.genstattu.com/blog/how-to-choose-rc-lipo-battery/

XiaoMi drone and DJI Phantom 4, which one do you like better ?

Neither Xiao mi or Dji, both of them are come from China, In recent days, Xiaomi unveils its drones:4k and 1080p. As we know Xiaomi is a famous smart Mobile phone manufacturer in China, but DJI is the largest UAV company in the world, now let me have a Depth comparison about Xiaomi 4k and DJI Phantom 4.

Aircraft

Here is DJI Phantom 4
Weight (including battery and propellers)        1380 g
Max Ascent Speed        6 m/s (Sport mode)
Max Descent Speed        4 m/s (Sport mode)
Max Speed        20 m/s (Sport mode)
Max Service Ceiling Above Sea Level        19685 feet (6000 m)
Max Flight Time        Approx. 28 minutes
Operating Temperature        32° to 104° F (0° to 40° C)
GPS Mode        GPS / GLONASS
Hover Accuracy        Vertical:
+/- 0.1 m (when Vision Positioning is active) or +/-0.5 m
Horizontal:
+/- 0.3 m (when Vision Positioning is active) or +/-1.5 m
Diagonal Size (Excluding Propellers)        350 mm

Xiaomi 4K
Weight (including battery and propellers)        1387g
Max Ascent Speed        6 m/s (Sport mode)
Max Descent Speed        1.5 m/s (Sport mode)
Max Speed        18 m/s (Sport mode)
Max Service Ceiling Above Sea Level        2000m
Max Flight Time        Approx. 27 minutes
Operating Temperature        32° to 104° F (0° to 40° C)
GPS Mode        GPS / GLONASS
Diagonal Size (Excluding Propellers)        434 mm

Accounding this list, both of them are simliar in general, but DJI Phantom 4’s Max descent speed and mas service ceiling above sea leavel are batter than Xiaomi 4K,  From another way, we can see DJI Phantom 4 used 5350mah 4s lipo battery, and Xiaomi is 5000mah 3s lipo battery,too.
Camera
Sensor        1/2.3” (CMOS), Effective pixels:12.4 M
Lens        FOV 94° 20 mm (35 mm format equivalent) f/2.8, focus at ∞
ISO Range
100-3200 (video)
100-1600 (photo)
Shutter Speed        8s -1/8000s
Image Max Size        4000×3000

Maybe DJI Phantom 4 is batter than Xiaomi 4K, but on another way, xiaomi 4K’s price is lower than DJI Phantom 4, and Xiaomi is a newbie in Drones, it has a lot of loyal customers and  Xiaomi will have a great development. Xiaomi’s main markert is in China, but DJI is in the world. So I believe Xiaomi drones will get a huge market in China.