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Old Jul 12, 2014, 01:18 PM
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Mini-Review
Yi zhan x4



INTRODUCTION



YI ZHAN a new chinese brand announced early june their new microquadcopter "X4" copying all the success ingredients of the hubsan X4:
6 axis stabilized quadcopter with microsize format and unibody canopy. Is this new model bringing something else than the numerous existing ones ?



BOX CONTENT





+ 1 x YI ZHAN X4 (with a 10.1g 350mAh LiPo, rated 25C using a micro-Losi connector)
+ 1 x Controler (using 6xAA batteries not included)
+ 1 x USB charger (ending with 2 male micro-losi connectors + 2 male mini-JST 1.25mm)
+ 4 x Spare props (2 CW, 2 CCW)
+ 1 x Instruction manual (english/chinese)
+ 1 x Screw driver






OVERVIEW



The size of this micro quadcopter is 145mmx135mm approximatively.



For comparaison: from left to right: JXD 385, YI ZHAN X4 and the JXD 388

The standalone X4 is scaling

while you have to add 10.1g to have the total weight


On the bottom part, you can find 4 bright and nice LEDs (green for front, and red for rear) ideal for night flying.


Motors are coreless 7mmx20mm model.

Props are very similar to the JXD 388 ones


with a individual weight of 0.35g


props colors are white for CW and black for CCW. In fact, in practice, it's not a good idea, you are losing some orientation capacity,
especially in daylights, where LEDs are almost invisible.

Props guard are screwed by two screws on each motor pods


and are scaling 0.9g



I found them a little bit thin to resist to shocks/crashes on very hard surface. It would be preferable to fly over grass in outdoors conditions.

The 1 cell LiPo 350 mah is scaling 10.1g


and is rated25C. The battery bay is large enough to welcome a 500mah LiPo.

The PCB board in jailed into this unibody frame.



2310 mosfets (up to 6A) can be found on the bottom layer while on the upper layer, you will find the 3 main chips: a 6050C for the flight stabilization, a unidentified ARM core as MPU and a Beken 2423 (nRF24L01 compatible) for the radio part. A 31mm antenna can be found soldered close the Beken chip







The transmitter is copying the Benma TX design. No LCD display for my X4 version, but a LCD version is also available.
The left shoulder button is selectioning between three speed modes. The beginner mode is the default one. If you press one time, you will enter in the intermediate mode (2 beep emitted) and if you press twice, you are entering in the sportive mode (3 beep emitted).
The right shoulder button is activating flips. A continuous beep is emitted until you indicate which direction to flip.
The gyroscope'scalibration procedure is common with V2x2 and JXD 38x models: select the sport mode and press both sticks in lower-left position.

When you are manipulating gimbals, you can feel a stronger action of the springs in the central zone while being less strong close to the external parts. Anyway, the transmitter is good without being the best one in its category.

The good news is concerning the protocol employed by YI ZHAN. They are using the "V2x2" protocol (from the "LG" compagny). So any V2x2 radios or JXD 385, 388, 392 can control this quadcopter. With some of them, you can also turn on/off the lights (which not possible with the shipped radio). The radio standalone is scaling 160g (without the 6xAA batteries not included)



FIRST USAGE

To arm your quadcopter, you need to push/pull the throttle stick. Immediatly, you can notice how stable is thus quadcopter. Hovering perfectly. The yaw rate is propotional to the selected speed mode.

In sportive mode, the yaw rate is really good. The X4 is banking very well and I didn't observe some oscillations during stabilization of the quad after a fast turning procedure (as it can be observed for example for the V252)

During flipping, the quadcopter is loosing 1m in average... so it's far to be perfect. Maybe motors are slightly undersized. Even with a 350mah, the flight duration is around 5mm so it's a little bit disapointing, we could expect a little bit more.

When LEDS are flashing fast, it's indicating that the LiPo have reached its LVC threshold (3.7v) and you have to land immediatly. When occured the first time, I didn't pay attention to these flashing leds (all the six) and the X4 felt like a stone (see outdoors video).

In outdoors conditions, this X4 represents a mix between the sportive behaviour of the JXD 385 while providing the smooth trajectories as for the JXD 388. In full forward speed, the velocity is close to the V252/385. Maybe due to a very high pitch angle, this X4 is loosing altitude in FFF. You have to counterbalanced this effect by some sporadic rear movements. Anyway, I found this X4 is flying extremely well in windy conditions. In calm conditions, this quadcopter is just flying great !!!!! precize, fast, etc.... 5m15 with the 350mah for the third flight while reaching 6m15 with the 500mah LiPo


CONCLUSIONS

For a first microquadcopter model, this YI ZHAN X4 is pretty good, stable, wind resistant, fast, DeviationTX compatible, with a really nice design including bright and large LEDS.
Of course, this product is not perfect. For example, the prop guards could be more solid/robust (in the other hand, the quad would be heavier) and the idea to mix the props color is not really a good one to keep the orientation. The flight duration could be a little bit improved too.

I think this quad a really good beginner model as the JXD 388 can be, because the stablization of this quad is just working great.


UNBOXING AND QUICK TESING

YI ZHAN X4 Unboxing and quick testing (Courtesy of Hobbygaga) (12 min 45 sec)

PROS

+ Nice design
+ Very stable and wind resistant
+ Fast
+ Good yaw rate (in sport mode)
+ Bright and efficient LEDs
+ Good range control
+ DeviationTX compatible (V2x2 protocol)
+ LVC alarm
+ USB charger with 2 micro-losi and 2 mini JST 1.25 connectors

CONS

- Mixed prop's colors for front and rear part
- Prop guards potentially inefficient for serious crashes
- 5mm of flight durations (even with the 350mah) 5m40 after LiPo rodage
- Very slightly underpowered motors (absolutly not problematic)
- You have to land extremely fast when LVC alarm is ringing



This quadcopter have been courtesy provided by Hobbygaga 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 30 USD at
http://www.hobbygaga.com/fr-yizhan-x...cd-p267993.htm
http://www.hobbywow.com/en-yizhan-x4...er-p237125.htm
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Last edited by SeByDocKy; Jul 15, 2014 at 06:21 AM.
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Old Jul 12, 2014, 01:18 PM
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Reserved for mod & videos

YI ZHAN X4 outdoors flght (Courtesy of Hobbygaga) (5 min 14 sec)
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Old Jul 13, 2014, 01:33 PM
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I flew again this YZ X4 in windy conditions and this quad is just rocking !!!!
Extremely fast, agile, and very Wind resitant. I love it
After a small rodage of the LiPo, now flight durations are around 5m30-5m40.
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Old Jul 14, 2014, 12:32 AM
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Hey SeByDocKy how are you man, how come you did not get the Lcd version?
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Old Jul 14, 2014, 02:47 AM
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Quote:
Originally Posted by Machy2k View Post
Hey SeByDocKy how are you man, how come you did not get the Lcd version?
Don't know , they sended me this model ....
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Old Jul 15, 2014, 03:05 AM
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A new video of the beast ....

YI ZHAN X4 full speed outdoors testing (Courtesy of Hobbygaga) (4 min 25 sec)
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Old Jul 15, 2014, 04:16 AM
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It looks great. Perfect design. Wish it could bind to hubsan controler.
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Old Jul 15, 2014, 06:22 AM
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Quote:
Originally Posted by madman_cro View Post
It looks great. Perfect design. Wish it could bind to hubsan controler.
Sorry ... but it bind any V2x2 compatible TX ... so you have a lot of choice
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Old Jul 15, 2014, 12:05 PM
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Excellent review, mine arrived yesterday will fly today with stock and V2x2 transmitters. guards off and YD717 props tomorrow.
Saw it for $30 with shipping n couldn't resist.

First flight today V2x2 transmitter set on 80% rates, leds off, 9 mph sustained wind and gusts to 22mph.
LOVED IT!! Flew great very stable, fast, tight banked turns and quick yaw. Lvc was only 4m 58s
Hope my battery gets stronger as yours did.
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Last edited by luna; Jul 15, 2014 at 02:13 PM.
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Old Jul 15, 2014, 12:55 PM
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Quote:
Originally Posted by luna View Post
Excellent review, mine arrived yesterday will fly today with stock and 2x2 transmitters. guards off and 717 props tomorrow.
Saw it for $30 with shipping n couldn't resist.
Make a feedback of these YD717 props installed
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Old Jul 15, 2014, 06:16 PM
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Quote:
Originally Posted by SeByDocKy View Post
Make a feedback of these YD717 props installed
Will do , tried them on v202 today same weather and rate settings. Plenty of lift and speed, a bit more wobble on recoveries and wider bank turns fff. Usually bring it back after 6 minute timer alarm and can fly another 1 1/2 minutes with walkera lady bird props and 300 mAh battery, Lvc cut out at 5m 8s. Maybe to windy and motors working harder with larger props but I won't settle with shorter flight times on the 202 for a bit more arco. Surprisingly the jjrc 1000 stock bnf did really well same wind and rate settings.
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Old Jul 16, 2014, 10:00 AM
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yi zhan - yd717 props

Second fff stock flight this morning, no wind really impressed.
Flight times are too short, l.v.c. was only 4m 35s not good.
jjrc 1000a was just as fast and agile.

Here's a few pics off 717 props, try for video when rain stops.
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Old Jul 16, 2014, 10:10 AM
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Thanks,

What about the lift capacity with these props ?
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Old Jul 16, 2014, 12:04 PM
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717 props

Barely lifted v202 @ 29.2 g , managed to get 21.9 g off ground with no control and got 17.3 g in air with minimal controls
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Old Jul 16, 2014, 12:10 PM
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717 props

Barely lifted v202 @ 29.2 g , managed to get 21.9 g off ground with no control and got 17.3 g in air with minimal controls
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