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Gearbest Tiny QX90 Whoopie review
#1
I just got this beauty from Gearbest to review:

Tiny QX90!

It came in a simple white box. It includes a battery (an interesting one), two sets of props, a buzzer and of course the whoopie itself.

The first few things I noticed:
  • The camera is attached to an LC filter. That is a good thing because the picture will be better, but this also means additional weight. The camera runs on 5-3.7 volts by the way.
  • The battery has two cells! This means lots of powah, kind of equivalent to 4S packs on 180-250 copters. Because of this battery, you can't charge it with a simple USB charger these thing usually come with, you need a proper LiPo charger. Of course the additional power is well worth it.

The camera + vtx unit

The camera has decent image, I can easily see everything in time. It can be used for other projects, too as it is only held on by sticky foam and a rubber band. Interestingly enough, it also has an image flip switch, you can also install it upside down (I have no idea why one would do that) The 170° FOV takes some time to get used to, maybe one or two batteries. After getting used to it, I found it very useful for tight turns.

The VTX frequency can be changed with DIP switches (meh) but has a cloverleaf antenna (yay). If the receiver is set to the right frequency, it has a clear picture in my whole house (okay, it is not a big one). It takes up around 60 mHZ of the 5.8 GHZ band, which is pretty good for this price.

Some say the cloverleaf antenna can break off in a big crash, but it is fine right now.



The battery

It is rare to find 2S packs in whoopies, and that is not right. I have tried several ones with 1S batteries and while they were fun, but definitely lacked thrust.

The specific one that comes with this kit has 300mAhs of capacity and a 25C discharge rate. The discharge rate is less than I am used to on 180+ quads, but more than enough in this size range. The label states the battery can be charged at even 5C. It can be useful when you are in a hurry, but you shouldn't charge it at this rate regularly.

The battery has a JST plug (20 AWG) and a balance plug (24 AWG).

My usual flight time is around 4 minutes, I think that's pretty cool.


The frame

The frame is a very simple X shape, made from carbon with cutouts to make it lighter It also has a simple upper plate, also made of carbon with cutouts, it is held in place by two standoffs. It should easily survive the crashes as the copter is very light. The motors are friction-fitted using rubber rings. I really like this method as the motors can easily be swapped but they are still held firmly and the rubber rings cancel out the vibration of the motors which can seriously mess uo the image of a CMOS camera. Thumbs up!

The motors

Well, here comes the fun part. Very few of there micro quad motors support 2S, but these do. They have the usual micro quad color-coding (black-white and red-blue) Their diameter is 8.5 mm, their height is 20mm, the biggest you can get right now. 


The props

The props appear to be unbreakable just like any other microquad props. The kit includes two sets, that is nice. They are bullnose peops, keep an eye out for that when ordering spares.


The FC

The FC is a regular brushed FC with an F3 chip, the extra feature is that it can also run on 2S. You can select the cell number with solder bridges. You also get a buzzer in the kit, it can be used as a low battery alarm. interestingly, the FC has 3 UARTs accessible, I have no idea what you would use besides the receiver. Anyways, the opportunity is there. It comes with cleanflight with very good PIDs but of course can be flashed with Betaflight as an SPRF3 EVO target.


The FrSky receiver

It is a very simple D8 protocol receiver. It has no telemetry, not even RSSI, but has failsafe so that is okay. You aren't going very far with this, anyway. It successfully bound to my 2015 LBT Taranis on the first try. To put it in bind mode, you have to put a solder bridge on the receiver and remove it afterwards (or short-circuit it with your hand if you have steady hands) which is a hassle but you only have to do it once. Then just select SBUS as a serial RX and you are ready to go. Simple. You can also use it for other projects, it has PPM output for older equipment or micro planes.

The buzzer


The kit also comes with a light-weight buzzer but I didn't add that. It is a pretty good and loud one. For voltage telemetry, I use the TH% value of the taranis.


Pros:

  • Cloverleaf antenna
  • 2S battery
  • FC comes configured
  • Carbon frame
  • Buzzer

Cons:

  • DIP switches
No, really, I can't say anything else negative about this little guy. It would be perfect without the DIP switches.

Verdict

This is a very good kit to get into micro quads if you have existing equipment and a little experience in the hobby.
What you need:
  • A DSM2 or ACCST(FrSky) transmitter
  • A LiPo charger capable of charging 2S packs and that can be set to charge under 300mA
  • FPV goggles (if you want to fly FPV)
I fly mini quads and I was able to set it up in about 10 minutes. This was the first whoopie I tried that had a 2S battery and it blew me away. I can recommend it to anyone wnating to explore the micro quad world. I think this BNF contains the best micro quad parts you can get right now, at a reasonable price.


Flight video

Coming soon (most likely on Saturday)

If you are interested in buying one, you can buy the FrSky version here, or the DSM2 version here.


Thank you for your attention, if you have any questions, feel free to ask me. Klaus out.
[-] The following 2 users Like varkokonyi's post:
  • Oscar, sirdude
#2
Mine is suppose to get here tomorrow....whoo hoo!! We're gonna have 10" of snow on Saturday, so I know what I'll be doing inside. : )
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#3
Here is the video! Enjoy guys! https://www.youtube.com/watch?edit=vd&v=81CzpslJ_lY


(01-06-2017, 12:39 AM)sirdude Wrote: Mine is suppose to get here tomorrow....whoo hoo!!  We're gonna have 10" of snow on Saturday, so I know what I'll be doing inside. : )

Did it arrive? How does it fly?
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#4
(01-09-2017, 02:49 AM)varkokonyi Wrote: Here is the video! Enjoy guys! https://www.youtube.com/watch?edit=vd&v=81CzpslJ_lY



Did it arrive? How does it fly?
Yes it arrived and it flies fine, it is I who can't fly very well.  In a couple of hours I had broken/lost enough of the props where I couldn't make a set to fly on from what I had left (more on the  way) and the VTX broke as well.  One of those on the way too....as well as an ant. protector.  Hopefully Ill have everything by next weekend.  I spent most of the time trying to tune the board.  It was way too aggressive out of the box for me.

Nice landing in the tree BTW!! Big Grin
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#5
(01-09-2017, 03:22 AM)sirdude Wrote: Yes it arrived and it flies fine, it is I who can't fly very well.  In a couple of hours I had broken/lost enough of the props where I couldn't make a set to fly on from what I had left (more on the  way) and the VTX broke as well.  One of those on the way too....as well as an ant. protector.  Hopefully Ill have everything by next weekend.  I spent most of the time trying to tune the board.  It was way too aggressive out of the box for me.

Nice landing in the tree BTW!! Big Grin

Strange, I just had to plug in the battery, it flew really well. If you have the exact same one, I can send you the pids I use, you can try those.

And thanks, I had to use a stick to knock it down. It was so cold that I couldn't move my finger to decrease the throttle. Fun times Big Grin
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#6
Great review varkokonyi!
Don't be a LOS'er, be a FPV'er :) -- My Fleet
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#7
To echo what Oscar said, I enjoyed the review as well, nicely done. I'm not sure yours and mine are identical.......your props are different and I didn't get the buzzer and mine was set up for 1S, but they did send me two of those. Mine came in a clear plastic box and the copter and accessories were in gray open cell foam. I would like to have a look at your pids if you don't mind, but it's probably more my lack of flying skills then it is the settings on the board. Were you flying in rate or angle mode?
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#8
Thanks guys. Well, yours is definitely not identical to this, but I will post a screenshot of my pids tab so you and anybody else can try them. I think that one extra cell makes quite a difference Big Grin I was flying in angle mode. It's pretty strange as I always fly in rate mode but brushed quads don't feel right in rate. So this was angle mode.
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#9
I used to fly in angle and said I could never fly in rate.........over the course of a LONG time I got comfortable with rate and now I doubt I could fly angle.....might be worth a try though..... Big Grin
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#10


There you go mate. Try them, maybe they work. Can you send a link where you got it? I believe my friend has a similar one as you.

And I do fly rate on 150+ brushless builds but I just can't get used to rate on these tiny brushed quads. I just need more sticktime, I guess
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#11
Your rates are identical to mine. I got mine at Amazon:

https://www.amazon.com/EACHINE-Racing-Qu...hine+qx+90

Paid a little more then I would have liked, but shipping was included and they have a great return policy.

Once I've got the thing flyable again I'll try angle mode on these rates. Currently I've got mine dummied down. Thanks for posting them....I appreciate it!
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#12
My friend has the exact same one, I will ask him to share his PIDs.
[-] The following 1 user Likes varkokonyi's post:
  • sirdude
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#13
Much appreciated!
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#14
(01-09-2017, 07:16 PM)sirdude Wrote: Much appreciated!

There you go mate: https://imgur.com/gallery/1dP4O

Blame @ziv_fpv on IG if they don't work Big Grin

Note that looptime also matters so match that, too
[-] The following 1 user Likes varkokonyi's post:
  • sirdude
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#15
My rates and PIDs:





I lost my last prop as I tried these and obviously it was sluggish, but I haven't had a chance to tweak these and I was flying rate.  Hopefully I will have a new batch of props in by the weekend and I can work on this a little ( a lot) more.  Thank you for all your help!
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