20 Best Quadcopter Flights

 

Hobbypower DIY F450 Quadcopter Kit with APM28 Flight Controller 7M GPS  920KV Brushless Motor Simonk 30A ESC

Hobbypower DIY F450 Quadcopter Kit with APM2.8 Flight Controller+ 7M GPS + 920KV Brushless Motor & Simonk 30A ESC

Hobbypower DIY F450 Quadcopter Kit with APM2.8 Flight Controller+ 7M GPS + 920KV Brushless Motor & Simonk 30A ESC - This is a diy hj-f450 quadcopter kit, it is unassembled. 8 flight controller 1 x 7m gps 1 x gemfan 1045(cw+ccw) black propeller 1 x gemfan 1045(cw+ccw) orange propeller 1 x gps bracket 1 x spare parts pack please be notice this kit does not include remote control, and battery, we have the at9 radio system in stock, if you need it, you can find them in my store. Package includes 1 x f450 frame kit 1 set x f450/f550 landing gear 2 x hobbypower 2212 920kv brushless motor cw 2 x hobbypower 2212 920kv brushless motor ccw 4 x hp simonk 30a speed controller 1 x apm2. Come with high quality electronic accessories, only need a 3s lipo battery and a 6ch above radio system to complete. This f450 quadcopter is a very popular machine, it has a strong rack, beautiful appearance, and a stable system for smooth flight, it is very good for fly and fpv.

 

GoolRC HGLRC Forward F4 AIO 20X20mm Brushless Flight Controller STM32F405 3-6S with GPS Connector on Board OSD for FPV Racing Drone RC Quadcopters

GoolRC HGLRC Forward F4 AIO 20X20mm Brushless Flight Controller STM32F405 3-6S with GPS Connector on Board OSD for FPV Racing Drone RC Quadcopters

GoolRC HGLRC Forward F4 AIO 20X20mm Brushless Flight Controller STM32F405 3-6S with GPS Connector on Board OSD for FPV Racing Drone RC Quadcopters - Small size 20×20 mm mounting holes (m2), multi-channel bec integration, strong anti-interference ability for fpv system. High-end quality supports the input voltage up to 3s-6s lipo battery comes with heat resistance damping ball to upgrade the stability and operation built-in betaflight osd to adjust pid stm32f405 ultra-high performance processor with built-in mpu6000 gyros and osd, support 5v/3a, 8v/15a bec. Efficient and lightweight f4 aio fc 20×20 more powerful stm32f405 cpu, operating at a higher frequency, making everything run smoothly you can add gps and anything else you like freely because the cpu utilization is low suitable for mini indoor outdoor racing drone, quadcopter. Strong overcurrent maximum current 280a , it’s big and small current plate structure, no interference for fc and pdb. Any problem, please contact our store without hesitation honor to serve you.

 

Bangcool MiniF4 Flight Control 5V1A BEC 2-4S MPU-6000 3 Axle Gyroscope Quadcopter

Bangcool MiniF4 Flight Control 5V/1A BEC 2-4S MPU-6000 3 Axle Gyroscope Quadcopter

Bangcool MiniF4 Flight Control 5V/1A BEC 2-4S MPU-6000 3 Axle Gyroscope Quadcopter - Support ppm receiver buzzer interface support programmable ledsd (turn off transponder before use) support blheli suite esc program. Special for 130-280mm(512-1102in) quadcopter. Built-in voltage detection, alarm. Made of high quality pcb (printed circuit board), very durable. Receiver support sbus or serial port rx interface, for spektrum 1024/2048, sbus, xbus, sumd and sumh rx built-in inverter.

 

iFlight 2pcs 5V Buzzer Alarm Super Loud FPV Buzzer Support F3 F4 F7 Flight Controller for FPV Racing Drone RC Quadcopter

iFlight 2pcs 5V Buzzer Alarm Super Loud FPV Buzzer Support F3 F4 F7 Flight Controller for FPV Racing Drone RC Quadcopter

iFlight 2pcs 5V Buzzer Alarm Super Loud FPV Buzzer Support F3 F4 F7 Flight Controller for FPV Racing Drone RC Quadcopter - Comes with 4 programmable ws2812 leds. Supports most popular flight controller in the market, f3, f4, f7. Mini size 271411mm, only 29g / pc. Super loud,the maximum sound can reach 110 dba. Item name fpv quadcopter led buzzer 5v supply.

 

QWinOut Deluxe 10DOF Version Pro SP Racing F3 Flight Controller NAZE32 Upgraded for DIY 250 RC Racer Quadcopter FPV Drone

QWinOut Deluxe 10DOF Version Pro SP Racing F3 Flight Controller NAZE32 Upgraded for DIY 250 RC Racer Quadcopter FPV Drone

QWinOut Deluxe 10DOF Version Pro SP Racing F3 Flight Controller NAZE32 Upgraded for DIY 250 RC Racer Quadcopter FPV Drone - Deluxe additional sensors for altitude and direction. Power off before unplugging, plugging in or making any connections. Connect only one source of power to the vcc pins / do not connect more than one source of power to two or more of the vcc pins eg if you are using escs with becs then remove the center red wire from all but one esc connector. 1 x upgrade nazae32 sp racing f3 flight control for multicopter with ms5611 barometer and hmc5883 compass 2 x 8p wire rod 2 x 4p extension path 5 x pins set. The 33v supply is for low-current use only 100ma max.

 

Pstars Mini CC3D Combo Atom Nano CC3D Flight Control for FPV QAV 250 Quadcopter Flight Controller Flying Control Straight Needle

Pstars Mini CC3D Combo Atom Nano CC3D Flight Control for FPV QAV 250 Quadcopter Flight Controller Flying Control Straight Needle

Pstars Mini CC3D Combo Atom Nano CC3D Flight Control for FPV QAV 250 Quadcopter Flight Controller Flying Control Straight Needle - ⭐⭐ 3-axis high-performance mems gyros and 3-axis high-performance mems accelerometer 4 layer pcb for superior electrical noise reduction and flight performance. ⭐⭐ Spektrum satellite receiver support futaba s-bus hardware support. ⭐⭐ This cc3d atom is about half the size of the regular openpilot cc3d, but with the same functionality now you can get all the great features and functionality of the full sized cc3d flight controller board but at about 1/2 the size. ⭐⭐ the cc3d provides a crisp feel when flying tricopters, quads, hexas, octocopters, and even fixed wing planes powerful stm32 32-bit micro-controller running at 90mips with 128kb flash and 20kb ram. ⭐⭐ Software support for windows, mac and linux direct high speed usb support with no drivers required.

 

Wolfwhoop 269TX 58GHz Wireless AV Transmitter Module For FPV DroneQuadcopterFlight Controla

Wolfwhoop 269TX 5.8GHz Wireless A/V Transmitter Module For FPV Drone/Quadcopter/Flight Controla

Wolfwhoop 269TX 5.8GHz Wireless A/V Transmitter Module For FPV Drone/Quadcopter/Flight Controla - Lpv you can connect your phone to the drone, the view will be displayed directly on your phone, and enjoy the world above the horizon, put your phone into the vr box or wear vr glasses to experience a different perspective (not included). Headless mode and one key automatic return regardless of the aircraft at any angle, the direction of the remote control as the standard for flight, control is more simple, in this mode, when the drone fly to the longer distance, press a key to return button, due to built-in positioning, drone can be easily recalled. Customize route mode just download the app on your mobile phone and connect to the wi-fi drone design your flight path directly on the screen and fly rc drone in all directions according to your desired air route. Functional flight path/360-degree rolling over/headless mode/led lights/one key automatic return/altitude hold/fpv/vr/gravity sensing mode/speed mode. Tx for fpv drone/quadcopter/flight controla.

 

Hobby RC Quadcopters Multirotors Folding Drone with Camera 720P Live Video WiFi FPV Altitude Hold 24G 4CH 6Axis RC Quadcopter Flight Plan Route Setting Ship from US

Hobby RC Quadcopters & Multirotors Folding Drone with Camera 720P Live Video WiFi FPV Altitude Hold 2.4G 4CH 6Axis RC Quadcopter Flight Plan Route Setting [Ship from US]

Hobby RC Quadcopters & Multirotors Folding Drone with Camera 720P Live Video WiFi FPV Altitude Hold 2.4G 4CH 6Axis RC Quadcopter Flight Plan Route Setting [Ship from US] - ☎ If you have any problem with your purchase, please send us messagewe will answer within 24 business hours and will give you a satisfactory solution if the one you receive doesn’t turn out to be what you expected, please contact us, we’ll be glad to replace a new one or give a full refund to you. 。◕‿◕。 toys toys for 2 year old boy toys for 1 year old boy toys for 3 year old boys toys for 2 year old girls toys for 1 year old girl toys for 3 year old girls toys for 4 year old boys toys for 6 year old boys toys for boys toys for 2 year old boys. 。◕‿◕。 Christmas decorations clearance outdoor lights christmas decorations for tree gingerbread christmas ornaments christmas ornaments clearance christmas ornaments 2019 christmas ornaments for girls christmas ornaments for boys christmas ornaments set christmas ornaments to make christmas ornaments to paint christmas ornaments to decorate christmas ornaments balls. 。◕‿◕。 Please ignore the estimated delivery date, we ship the item from usa, it will only takes about 5-7 days to arrive. 。◕‿◕。Christmas decorations clearance christmas decorations clearance outdoor christmas decorations clearance under 10 christmas decorations clearance prime christmas decorations clearance sale outdoor christmas decorations clearance outdoor inflatables christmas decorations clearance sale christmas decorations clearance ornaments christmas decorations clearance for door christmas decorations clearance balls christmas decorations.

 

ELEOPTION 2 PCS Hight discharge LI-PO Battery 111V 2200mAh 25C Battery for DJI Phantom 1 FC40 Quadcopter Flight For RC Airplane RC Helicopter

ELEOPTION 2 PCS Hight discharge LI-PO Battery 11.1V 2200mAh 25C Battery for DJI Phantom 1 FC40 Quadcopter Flight For RC Airplane RC Helicopter

ELEOPTION 2 PCS Hight discharge LI-PO Battery 11.1V 2200mAh 25C Battery for DJI Phantom 1 FC40 Quadcopter Flight For RC Airplane RC Helicopter - 3. Product features 1. 42. Specifications battery type lithium polymer (lipo battery) c rate 25c volts 11. With features like 14 awg soft silicone wire leads this battery gives you the power you are looking for. 2. 3 x 0. 6v min volts per pack 9v charge rate 1c (2. Whether you have a short course truck, an 8th scale buggy, a monster truck, heli, jet, airplane or quad, this battery pack delivers the results and run-time you have come to expect from all venom batteries. 6a) wire gauge 14 awg soft and flexible low resistance silicone wire plug type xt60 dimensions 103 x 34 x 20. 8 in watt hours 24. 1v capacity 2200mah cell count 3s cell configuration 3s1p continuous discharge 25c max burst rate 30c (66a) max volts per cell 4. 5 mm / 4 x 1. 1 lipo is the battery for you. When you want a powerful battery pack that you can depend on even when you push it to its limits, this 25c 3s 2200mah 11. 2a) max approved charge rate 3c (6. 2v max volts per pack 12.

 

ELEOPTION 1 PCS Hight Discharge LI-PO Battery 111V 2200mAh 25C Battery for DJI Phantom 1 FC40 Quadcopter Flight for RC Airplane RC Helicopter

ELEOPTION 1 PCS Hight Discharge LI-PO Battery 11.1V 2200mAh 25C Battery for DJI Phantom 1 FC40 Quadcopter Flight for RC Airplane RC Helicopter

ELEOPTION 1 PCS Hight Discharge LI-PO Battery 11.1V 2200mAh 25C Battery for DJI Phantom 1 FC40 Quadcopter Flight for RC Airplane RC Helicopter - 2v max volts per pack 12. 3 x 0. 3. Product features 1. 2. Whether you have a short course truck, an 8th scale buggy, a monster truck, heli, jet, airplane or quad, this battery pack delivers the results and run-time you have come to expect from all venom batteries. 6v min volts per pack 9v charge rate 1c (2. When you want a powerful battery pack that you can depend on even when you push it to its limits, this 25c 3s 2200mah 11. 5 mm / 4 x 1. 1v capacity 2200mah cell count 3s cell configuration 3s1p continuous discharge 25c max burst rate 30c (66a) max volts per cell 4. With features like 14 awg soft silicone wire leads this battery gives you the power you are looking for. Specifications battery type lithium polymer (lipo battery) c rate 25c volts 11. 6a) wire gauge 14 awg soft and flexible low resistance silicone wire plug type xt60 dimensions 103 x 34 x 20. 8 in watt hours 24. 1 lipo is the battery for you. 42. 2a) max approved charge rate 3c (6.

 

Goolsky WHOOP PRO F3 FC Flight Controller with BEC OSD for H36 Tiny Whoop Blade Inductrix RC FPV Racing Quadcopter

Goolsky WHOOP PRO F3 FC Flight Controller with BEC OSD for H36 Tiny Whoop Blade Inductrix RC FPV Racing Quadcopter

Goolsky WHOOP PRO F3 FC Flight Controller with BEC OSD for H36 Tiny Whoop Blade Inductrix RC FPV Racing Quadcopter - High quality, exquisite workmanship and efficient service in use. Mpu-6000 triaxial accelerometer / triaxial gyroscope (spi connection). Built-in osd interface, active buzzer interface and voltage detection alarm. Comes with 4 6a brush motor drive, fully meet the demand. Supply 1s battery input (dc 36-42v), built-in 5v / 05a step-up circuit.

 

HUIFEIDEYU Flight Controller Board for Betaflight F4 V3 Built-in Barometer OSD TF Slot for FPV Quadcopter

HUIFEIDEYU Flight Controller Board for Betaflight F4 V3 Built-in Barometer OSD TF Slot for FPV Quadcopter

HUIFEIDEYU Flight Controller Board for Betaflight F4 V3 Built-in Barometer OSD TF Slot for FPV Quadcopter - Smartaudio v2 support, tune your pid’s and configure the omnibus f c from your transmitter. Sd card blackbox, baro(bmp280), 5v 3a sbec, on-board video filter(only can supply 5v to vtx and camera). Smartaudio v2 via tx6 on j10, 4×3 pin esc pin layout, ir pins for lap timing transponder. Stm32 f405 mcu, dshot support, drag and drop osd configured via betaflight configurator. Mpu6000 6 axis spi gyro & accelerometer, sbus/ppm and spketrum dsm-x ports.

 

FPVDrone Naze32 Rev6 Acro Flight Controller Board for Mini FPV QAV250 Quadcopter Racing Drone

FPVDrone Naze32 Rev6 Acro Flight Controller Board for Mini FPV QAV250 Quadcopter Racing Drone

FPVDrone Naze32 Rev6 Acro Flight Controller Board for Mini FPV QAV250 Quadcopter Racing Drone - The naze32 acro flight controller board use for battery voltage monitoring, very good quality and usefu. Onboard usb for setup and configuration. Modern gui for all operating systems, baseflight configurator. Modern 32-bit processor (stm32 f103) running at 33v/72mhz. Built-in frsky telemetry converter.

 

Rabing RC Quadcopter Flight Path FPV VR WiFi RC Drone 24GHz 6-Axis Gyro Remote Control Drone HD 2MP Camera Drone

Rabing RC Quadcopter Flight Path FPV VR WiFi RC Drone 2.4GHz 6-Axis Gyro Remote Control Drone HD 2MP Camera Drone

Rabing RC Quadcopter Flight Path FPV VR WiFi RC Drone 2.4GHz 6-Axis Gyro Remote Control Drone HD 2MP Camera Drone - Customize route mode just download the app on your mobile phone and connect to the wi-fi drone design your flight path directly on the screen and fly rc drone in all directions according to your desired air route. Headless mode and one key automatic return regardless of the aircraft at any angle, the direction of the remote control as the standard for flight, control is more simple, in this mode, when the drone fly to the longer distance, press a key to return button, due to built-in positioning, drone can be easily recalled. Functional flight path/360-degree rolling over/headless mode/led lights/one key automatic return/altitude hold/fpv/vr/gravity sensing mode/speed mode. Perfect shot 2mp 720p hd camera, is 100-1200 and 120 degree wide angle camera, powerful air pressure altitude hold function allow you to release the throttle stick and the drone will keep hovering at the current height easy for you to shoot quality images or videos. Lpv you can connect your phone to the drone, the view will be displayed directly on your phone, and enjoy the world above the horizon, put your phone into the vr box or wear vr glasses to experience a different perspective (not included).

 

2Pcs 37V 220mAh Lipo Battery for E61 E61HW RC Drone Quadcopter Part60 x 30 x10mmFlight 8 Minutes

2Pcs 3.7V 220mAh Lipo Battery for E61 E61HW RC Drone Quadcopter Part,60 x 30 x10mm,Flight 8 Minutes

2Pcs 3.7V 220mAh Lipo Battery for E61 E61HW RC Drone Quadcopter Part,60 x 30 x10mm,Flight 8 Minutes - Rc trucks for adults rc trucks for adults 1/10 scale rc trucks for adults high speed rc trucks for adults 1/4 rc truck and trailer boat rc truck body rc truck body accessories rc truck stand rc truck 4×4 rc truck 4×4 off road waterproof kit rc truck 4×4 off road rc truck accessories rc truck accessories trailer hitch rc truck accessories 1/12 rc truck accessories 1/10 rc toys rc toys for boys rc toys for girls rc toys for toddlers rc toys for adults. Rc drone rc quadcopter drone rc drone with camera mini rc drone foldable rc mini drone with hd camera rc drone wifi quadcopter udi rc drone rc drone foldable holy stone f181c rc quadcopter drone s9 micro foldable rc drone rc drone for kids rabing mini fpv rc drone rc mini drone with camera furibee f36 mini rc drone holy stone gps fpv rc drone hs100 holy stone hs110d fpv rc drone rc predator drone mini foldable rc drone rc drone car rc drone for adults holy stone hs230 rc racing fpv drone tenk. Helicopter toy remote controls remote quadcopter rc helicopter rc for aircraft airplane mini cars led lights remote control toys metal toys games gyro camera gifts photography blade drone rc quadcopters battery ufo radio control parts fashion control axis toys hobbies men’s fashion game repair tool servo rc drone rc toy hobby bluetooth boat phone case headphones case led flash. Selfie drones with camera for adults toys for men drones small drone drones with camera drone camera dron camera fpv camera drones with camera for adults quadcopter drone with camera drone hd video camera drones for adults toy camera rc drone flying toys mini rc infraed induction helicopter aircraft rc flying toys for kids boys girls xmas holiday birthday gifts remote control drone helicopter rechargeable light up ball infrared induction rc drone toy remote control trucks monster rc car. Rc spare tire frame mount carrier ladder cover upgrade metal tire seat buckle tire holder metal spare tire seat for 1/10 land cruiser lc80 rc car model toy diy accessories rc crawler car hop-up parts for jeep trailer rv suv and many vehicleflying toys for boys remote control kids dinosaur balloon fairy girls airplane disc outdoor adults animal led ball glow toddler with plane by saucers adult year old dog squirrel dogs children toddlers small slingshot birds foam cat bird best us toy fidget.

 

FineXiaomi FIMI A3 58G 1KM FPV with 2-axis Gimbal 1080P Camera GPS RC Drone Quadcopter RTF Flight Time 25mins White

FineXiaomi FIMI A3 5.8G 1KM FPV with 2-axis Gimbal 1080P Camera GPS RC Drone Quadcopter RTF Flight Time 25mins (White)

FineXiaomi FIMI A3 5.8G 1KM FPV with 2-axis Gimbal 1080P Camera GPS RC Drone Quadcopter RTF Flight Time 25mins (White) - 5 functions up/down, forward/backward, turn left/right, sideward flight, one key taking on/off, gps mode, headless mode, one key return, follow me, orbit, fixed-wing mode, dronie, diy supported, low battery protection, automatic return losing signal, mode 1/ mode 2 switchable. 3with lightweight design, the drone flies fasterwth quick-release propellers, fast and powerful propulsion with durable,well balanced design. 1 hd 1080p camera powered by ambarella isp processor and sony cmos sensor, provides perfect hd picture and video. 4with diy port, you can explore your way to play with the drone, like driving a servo, lighting a ledremote controller is built-in lcd screen, dvr, and user interfaceheadless mode,no need to adjust the position of aircraft before flying . 2the 2-aixs mechanical and 3-aixs electronical gimbal provides stable and smooth footage in any situation.

 

Goolsky XK X100 Drone 24G 3D 6G Mode Indoor RC Quadcopter Support FUTABA S-FHSS with Inverted Flight BNF

Goolsky XK X100 Drone 2.4G 3D 6G Mode Indoor RC Quadcopter Support FUTABA S-FHSS with Inverted Flight BNF

Goolsky XK X100 Drone 2.4G 3D 6G Mode Indoor RC Quadcopter Support FUTABA S-FHSS with Inverted Flight BNF - Modern gui for all operating systems, baseflight configurator. Built-in frsky telemetry converter. Modern 32-bit processor (stm32 f103) running at 33v/72mhz. Onboard usb for setup and configuration. The naze32 acro flight controller board use for battery voltage monitoring, very good quality and usefu.

 

QWinOut F4 Flight Controller Board Built-in OSD for DIY Mini RC FPV Racing Drone Quadcopter

QWinOut F4 Flight Controller Board Built-in OSD for DIY Mini RC FPV Racing Drone Quadcopter

QWinOut F4 Flight Controller Board Built-in OSD for DIY Mini RC FPV Racing Drone Quadcopter - In betaflight gui. Com/betaflight/betaflight/releases http//dronin. 0 plug, 5-6 as pinheaders) only 36x36mm, mount holes 30. 128mbit flash, please always use bec for the fc. Omnibus f3’s upgrade version, using f405 instead of f303, could run faster loop time. 5mm no baro spi sensor mpu6000 128mbit flash package incl. 1 firmware sbus/ppm input (pinheaders) 6pwm output (1-4pinheaders and sh1. Org/ features stm32 f405 mcu, runs betaflight 3. Classic omnibus design, using f4 mcu controls osd over spi bus in dma mode, osd configation has been incl. 1x fc. Supported by betaflight and dronin https//github. Incl. Mpu6000 at spi bus. 5×30.

 

KINGZER CC3D Openpilot Open Source Flight Controller 32 Bits Processor for QAV250 C250 250 Quadcopter

KINGZER CC3D Openpilot Open Source Flight Controller 32 Bits Processor for QAV250 C250 250 Quadcopter

KINGZER CC3D Openpilot Open Source Flight Controller 32 Bits Processor for QAV250 C250 250 Quadcopter - Direct high speed usb support with no drivers required, a truly plug and play devicespektrum satellite receiver supportfutaba s-bus hardware supportinnovative flexi-port technology for superior port flexibility4mbits on-board eeprom for configuration storage. Cc3d coptercontrol hardware featurespowerful stm32 32-bit microcontroller running at 90mips with 128kb flash and 20kb ram3-axis high-performance mems gyros and 3-axis high-performance mems accelerometertiny 36mmx36mm 4 layer pcb for superior electrical noise reduction and flight performancesoftware support for windows, mac and linux. Naturally for a high-end product, the hardware is complete there is nothing to solder the included rc harness allows you to connect any standard pwm receiver all coptercontrol boards are tested before shipping and come with bootloader already flashed a standard mini-usb cable (not included) is used to load the latest firmware and configure everything for your unique airframe . Flexiportcoptercontrol also offers the innovative flexi-port which provides either i2c connectivity or a second serial port flexi-port gives coptercontrol the flexibility to use either i2c and a single serial port or dual serial ports, according to your connectivity needs superior user experienceopenpilot has tried to make your experience with the cc3d as easy and trouble-free as possible.

 

Matek Analog Airspeed Sensor ASPD-7002 for FPV Drone Quadcopter Flight Controller LIke F405-WING F411-WING MPXV7002DP 48-52V 20mW Built-in Voltage Divider

Matek Analog Airspeed Sensor ASPD-7002 for FPV Drone Quadcopter Flight Controller LIke F405-WING F411-WING MPXV7002DP 4.8-5.2V 20mW Built-in Voltage Divider

Matek Analog Airspeed Sensor ASPD-7002 for FPV Drone Quadcopter Flight Controller LIke F405-WING F411-WING MPXV7002DP 4.8-5.2V 20mW Built-in Voltage Divider - ~Packing included 1x matek analog airspeed sensor aspd-7002,1x pitot tube ,1x silicon tube. ~note don’t forget to calibrate after installing the airspeed sensor and it is not recommended for most new users, cause it requires additional tuning and adds one more layer of control to set up. ~Matek analog airspeed sensor aspd-7002 with mpxv7002dp input voltage 48~52v dc working current 20ma sig pad 05~45v output. ~1/2 pad has voltage divider built-in, 025~225v output pressure range -2 to 2 kpa (-03 to 03 psi) speed range -200 to 200 km/h. ~This analog airspeed sensor could help to fly the drone slowly and autonomous landings in windy condiction.