SMALL - Telemetry SMALL - Radio
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Old Jun 21, 2015, 12:11 PM
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Mini-Review
QW350-2, 350mm Phantom with 5.8G FPV (Under construction)



INTRODUCTION

Here are the first elements of my mini-review of the new DJI phantom clone, the QW350-2 from Plastic shenzen chithwan compagny. This model of course is including GPS, compass and baro for GPS lock and RTH but also a full 5.8G FPV + OSD system. All the setup for around 360 USD. In practice, it's more a competitor of the Cheerson CX-20 open source.We will see if the quality have been sacrified


BOX CONTENT

+ 1 x QW350-2 (with a 3S 2700mAh, 20C LiPo ending with JST connector )
+ 1 x Transmitter (using 4xAA lithium batteries included)
+ 1 x Props wrench
+ 1 x Charger for the LiPo battery
+ 1 x Charger for Lithium batteries
+ 1 X Phone holder to use your smartphone as camera
+ 8 x Spare 8045 props (4 CW, 4 CCW)
+ 1 x Instruction manual (English/Chinese)
+ 8 x Stickers (4 blue, 4 red)

OVERVIEW

-Front view




-Side view




-Rear view









Some free room is available mainly in height dimension (approximatively 1cm)



-Bottom view



2 attach system is available in the front and the rear positions. Nice initiative for example to attach a GoPro mount or the provided smartphone holder clip.

The 433Mhz antenna is taped on the rear right leg



while the 5.8G antenna is located inside the battery bay



The front left attach of the landing skid welcome a 1.25mm mini-JST 5p connetor.



This one must be used to connect the PC software (see below)

Same type of LEDs as for the Phantom perfectly visible in daylight conditions.




Without battery, the weight is



and with the 2700mAh battery




Battery

A 2700mAh 3S LiPo with a discharge rate of 20C... Maybe a little bit weak. it offers around approximatively 13min of flight










Disassembling

It's very easy to open the top canopy part. Only 4 screws per arms. In 3 minutes, you can access to the interior/electronic. A good point for maintenance. The general quality of the soldering job is very positive.



The GPS module is hidden behind a RF shield







Motors



Some 22 type motor, no KV mentionned probably very similar to the phantom ones. They offer in practice a lot of thrust capacity.




ESC



No mention about the maximum supported amperage... I will look for more information. The soldering job is very clean.


Flight controller



A large 8 bits ATmega chip ...



The L883 as compass and a MEAS chip for barometer. This architecture is very known .... smell like APM compatible model and the answer is YES !!! It's arducopter/APM compatible !!!! you can connect the QW350 to the "mission planner" software via the FTDI cable. I made one with a mini-JST 4p I have (no 5P). The black wire is GND, red is +5V, yellow is RX and green is TX (you will have to invert RX<->TX and TX<>RX with your FTDI device). Notice also the presence of a BGC free port probably to control a gimbal ? I have to investigate.
Finally, there is an UART port... Maybe to connect a telemetry/Bluetooth device. Need also an investigation.








On top right of the PDP, a switch can be installed... I don't know for which usage





FPV camera

A nice model of FPV camera. Colors are sharp and precize . The light sensitivity is relatively good.



Unfortunatly the FPV camera orientation is set a little bit in the direction of the ground. You will need to modify the canopy structure to fix it horizontaly if you want to use the QW350-2 more as a FPV plateform.


Receiver



The bind button is located on top


5.8G FPV transmitter

Located under this black heatshrink. Assumed to be a 400mW model working in boscam band AFAIK. Notice the presence of a uFL connector.




A free port to install a 1.25mm 3P switch is available. As you may see, the port is connected to the channel selection pins of the main VTX unit.

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Old Jun 21, 2015, 12:12 PM
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Transmitter



Only two 3-way switches are available.

The left one selects flight mode:
- upper position: manual mode
- central position : altitude hold mode
- bottom position : GPS lock position mode

The right one selects emergency modes:
-upper mode : no specif action
-central position : RTH (GPS mode must be engaged too)
-bottom position : Emergency landing


2 tiny switch buttons are located behind



The "red" one is the bind button if I translated correctly from chinese . I think you have to press both this tiny TX bind button and the RX one to renew the binding procedure. To access the RX bind button, you will need to remove the top canopy part of the QW350.

The other tiny switch button is to activate the "Lithium" mode. I never pressed on this one even if instruction manual says to do.... It worked directly out of the box to charge the batteries(status LEDs turns into green when recharging and is offf when recharged)

4 Lithium batteries



The RF chip, as you can see, different frequencies are avaible covering the 433Mhz and the 900Mhz bands.



Two free connectors are available on the TX PCB (in fact three). Maybe a way to install to extra pot to control a gimbal ?







FPV monitor

A 4.3" size approximatively without any sun shade... To be honest, it's almost impossible to see something in daylight conditions.
You will need install one. The quality of the screen display is not fantastic.... but you can tune contrast, brightness via the menu



As you can see in the unboxing video, the two upper buttons are used to navigate between sections of the menu. The central button is the "OK" validation button while the last two ones select different suboption inside a category. There is also builtin DVR welcoming a microSD card. A good point if you want to record or take photos of your FPV session. Videos in the DVR are recorded in 720x288.

QW350-2 raw FPV video recorded with builtin DVR (0 min 56 sec)


In practice, I found the recording buggy. Recording is most of the time not well stopped and by consequence files are corrupted.

Another video of the FPV part recorded with my GS922 goggles

QW350-2 FPV session recorded with GS922 goggles (2 min 24 sec)


You can see the general good performances of this camera

A RP-SMA connector is present.... a good point to install your favorite 5.8G antenna



On the left side of this RP-SMA connector, a tiny switch button cycles bethween the 9 boscam frequencies. By default, the QW350-2 is set to 5945Mhz (freq 8 in the FPV monitor)

FIRST USAGE


QW350-2 first outdoors test (Courtesy Gearbest) (8 min 52 sec)


As you can see, it's a very sporty quadcopter out of the box with a lot of power available (especially with 9 inch props).
Anyway, I don't know if the electronics were perturbated by my GoPro clone camera or by some metallic struture elements, I found in GPS hold and hold position modes some extra woobles/vibrations instabilities and even some deviation/shiftting/flyway in pure GPS hold mode (even afte a solid compass calibration via the mission planner software). Without the gopro cam and over grass no more drifting observed...
I have to investigate this important point. The OSD informations is a very nice builtin feature. You can monitor all important parameters directly. Flight duration is in averarage of 13-15min.

A GPS hold and RTH demo

QW350-2 RTH & emergency landing demo (Courtesy Gearbest) (6 min 57 sec)




CONCLUSIONS

N/A yet. Need more testings


UNBOXING

QW350-2 unboxing and first analysis (Courtesy Gearbest) (31 min 4 sec)




PROS

+ Power full quadcopter
+ Compatible up to 9 inch props
+ Very well built (clean assembling)
+ Good packaging
+ APM/Arducopter
+ Nice radio working @433Mhz
+ Powerful Lithium batteries for the radio & FPV monitor
+ DVR included in the FPV monitor
+ Powerful VTX (400mW)
+ uFL antennas connectors (for both the 433Mhz and 5.8G parts)
+ Good FPV camera (good light sensitivity, approx 110-120 degreees of FOV)
+ OSD information via minimOSD
+ Easy mantenance
+ Price


CONS

- No FTDI cable to connect to the "Mission Planner" software (important to calibrate accelero and compass)
- Too sporty flight caracteristics out of the box
- No VTX frequency's DIP switch on the quadcopter (but can be installed, 1.25mm pitch)
- FPV camera orientation (fixing the ground)
- Default PIDs values (some unstabilities/woobles especially in altitude hold/GPS modes)
- GPS sensitive to RF interferences (HD cam ?, metallic structures ?)
- No advanced instruction manual in the box (attached below but in chinese only)
- DVR included in the FPV monitor buggy (can't correctly stop file's recording)
- FPV monitor menu navigation and stop recording keys combinaison
- No pot switches to control gimbal (but maybe it's possible to add some)

This quadcopter have been courtesy provided by Gearbest in order to make a fair and not biased review. I would like to thanks them for this attitude.

You can find it actually for 357 USD at QW350-2 (There is a coupoon : "QW350" to got it at 330 USD until the 31/07)
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Old Jun 21, 2015, 12:13 PM
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Old Jun 21, 2015, 12:14 PM
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Old Jun 22, 2015, 02:46 AM
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-Added new elements, videos and fixed part of typos
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Old Jun 22, 2015, 03:04 AM
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is it better than CX-20?
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Old Jun 22, 2015, 03:13 AM
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Quote:
Originally Posted by Quadbuddy View Post
is it better than CX-20?

seems to be ... still got some concerns why GPS & RTH works fine sometimes, sometimes not (I have to find the source of interférences)
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Old Jun 22, 2015, 11:26 AM
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So far it looks like no competitor for this quadcopter in 350$ price tag. Absolutly amazing quad.
SeByDocKy - you are master of this kind reviews. Thanks!
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Old Jun 22, 2015, 11:33 AM
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Quote:
Originally Posted by arczi79 View Post
So far it looks like no competitor for this quadcopter in 350$ price tag. Absolutly amazing quad.
SeByDocKy - you are master of this kind reviews. Thanks!

Hummm I won't celebrate yet victory for this model. I need more testing....As soon as I find what was wrong for RTH, I will feel more confident. Another con points, actually no gimbal control out of the box....

Anyway, thanks for your nice words
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Old Jun 23, 2015, 12:38 AM
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There is a coupoon : "QW350" to got it at 330 USD until the 31/07
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Old Jun 26, 2015, 03:11 AM
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Anyone have this machine on the way ? I ordered some microJST 1.25mm 5p to design a proper FTDI cable. (http://www.aliexpress.com/item/20-SE...313079833.html) I will try also to see if a bluethooth adapter can be installed and/or telemetry.
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Old Jul 01, 2015, 08:24 AM
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Qw-350

Just got it and it is squirrelly out of the box. I have cable on order and awaiting addl. props (9 in.). I will have to get the mini jst on order. I have had the fly away problem. It occurred when I took of from metal bbq . No problem when taking off from ground.
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Old Jul 01, 2015, 08:54 AM
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Quote:
Originally Posted by Diego Skyline View Post
Just got it and it is squirrelly out of the box. I have cable on order and awaiting addl. props (9 in.). I will have to get the mini jst on order. I have had the fly away problem. It occurred when I took of from metal bbq . No problem when taking off from ground.
Glad to know. Please post feedbacks, videos here
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Old Yesterday, 03:06 PM
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Down to 268.00 at gearbest.
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Old Yesterday, 03:12 PM
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Quote:
Originally Posted by Diego Skyline View Post
Down to 268.00 at gearbest.
Yes ... QW350-2


but it's not including shipping, anyway it's a very good price !!! for such machine
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