schumixmd's blog View Details
Posted by schumixmd | Mar 25, 2019 @ 03:15 PM | 2,495 Views
What gear will you fly this summer?!
On a low budget, I will go with this nice package. Hopefully I will not suffer performance issues.

URUAV 5.8Ghz 2.3dBi Lollipop Antenna
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Eachine TD600 25/200/600/800mW 5.8GHz 40CH FPV Transmitter with in-line DVR and Smart Audio support
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Posted by schumixmd | Jan 22, 2019 @ 03:11 PM | 6,527 Views
Compiled my build of OpenTX 2.2.3 for Jumper T12 with the alternative navigation patched.

The firmware’s are available on GitHub in my Fork of OpenTX:

Update 23.02.2019.

Earlier compiler 2.2.3 firmware didn't include R9M flex option.
Now I have merged the code from OpenTX/2.2 branch into main and compiled the firmware with correct option.
This version will show: 2.2.4 (schumixmd)

The firmwares can be found on GitHub:
Posted by schumixmd | Oct 09, 2018 @ 01:57 PM | 11,196 Views
I've got my Jumper T12 for review transmitter few days ago. Unfortunately it came so late that it almost make no sense to make another review, so I thought I will not spend my time making a review, rather I will spend it on something better. I hope BGKevin who sent me the TX will understand.

The reviewers reported few problems with the TX:
1. since the Jumper T12 actually is the copy of the Taranis X7 but instead of the rotary encoder for menu navigation it got four buttons, the navigation in the menu is implemented awful and it is very weird, considering such button layout.
2. on the transmitter the switches are marked G and H, but since the companion doesn't have the Jumper T12 radio type and Taranis has switches F and H, sometimes its confusing to configure.

OpenTX team said that they will not support JumperTX in any way and the problem left to be solved by Jumper team.
I have decided to adventure myself and correct those problems by "porting" the OpenTX firmware to the Jumper T12 in a different way than Jumper team did.

First of all, having the + layout of the buttons, it make sense to have the navigation somehow similar to what Taranis Xlite has. Additionaly Xlite has the "shift" key, but it is there more for the trims, because Xlite doesn't feature separate trim buttons for both sticks, so I don't mind that it is not present on T12. This is the first task.

The second task is to add Jumper T12 board in Companion with correct...Continue Reading
Posted by schumixmd | Sep 23, 2018 @ 06:38 AM | 7,696 Views
After getting myself a new FrSky Horus X10 to enter the OpenTX world, I was offered to review the Jumper T8SG Lite Multi-Protocol transmitter which also runs on a open-source firmware.

The transmitter came few days ago. After playing with it for few days here's what I think...
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The Box and unbox:

The Jumper T8SG Lite comes in a small box and assuming the shipping company would handle the box normally it is unlikely to be damaged. In the box you don't get too much - the transmitter itself, a nice orange neckstrap with Jumper text and a mini-usb cable. The batteries are not included.
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Posted by schumixmd | Sep 18, 2018 @ 02:48 PM | 7,109 Views
The Jumper T8SG Lite arrived from Banggood.
I will use it few days and afterwards will update the review. Until then few photos.
Posted by schumixmd | Sep 04, 2018 @ 11:22 AM | 6,941 Views
I've got my FrSky Horus X10 about month ago. I have updated it directly to OpenTX. I have to say that this is my first time I play with OpenTX (moved from Hitec Aurora 9 and Spektrum DX8) and yet - I don't regret.

The voice functionality in OpenTX is great. Maybe default sound pack is not ideal, but Amber soundpack completes it and you have sounds for every single function/mode/switch you toggle if you need, but somehow, I wanted to add some realism to my flying experience and if I can't do it in real life, I can use some Airliner sounds on my TX.

I don't know if there are already any realistic soundpacks for OpenTX, but nevertheless I have compiled mine, which I would gladly share with you.
Here's a the list of sounds, in the style of Boeing 737, available in the soundpack:
  • 10
  • 20
  • 30
  • 40
  • 50
  • 100
  • 200
  • 300
  • 400
  • 500
  • 1000
  • 2500
  • Altitude alert
  • Altitude alert 2
  • Set altitude enter
  • AP Disconnect
  • AP Disconnect 2
  • Aproaching minimums
  • Flight Attendant chime in
  • Bank angle
  • Don't Sink
  • Too Low - Flaps
  • Too Low - Gear
  • Too Low - Terrain
  • Minimums
  • Overspeed clicking sound
  • Pull Up
  • Sink Rate
  • Jet Turbine Startup
  • Terrain
  • Terrain Pull Up
  • Windshear

Also the soundpack replaces the file SYSTEM/hello.vaw - but this time not with a realistic one but with a very fun one, but I'll let it as a bonus for you to discover.
I have installed the Amber and didn't found any filename conflicts, but is up to you to take care of not overwriting your files.

The sound pack is attached here and also stored in Dropbox and can be downloaded HERE!

Update: The sound pack has been uploaded to GitHub. One can now download it, file by file.

Posted by schumixmd | Jan 11, 2017 @ 05:22 PM | 10,191 Views
One more dream in my list of wishes is realized. I own a 3D printer! Maybe this is not a big achievement in a life time, but definitely it is important in my career as “Engineer”. I’ve learned a lot of things from this build, and I am very ready for the next challenge.

I am not sure, I can transpose the build log from my blog here, therefore I let the link here, for the ones who are interested:
Posted by schumixmd | Oct 23, 2016 @ 08:34 AM | 11,006 Views
Hi everybody,

If you are in trouble to find which TX will be the best option for your needs, then I want to make it much worse - because there is at least one new TX on the market - GoolRC TX40 5.8G 40CH 600MW sold on Amazon.

This transmitter seems not to be too much different than the well known TS5828, TS5823 or even Eachine TX526.

The package includes:
  • 1x Transmitter module
  • 1x 5.8Ghz Antenna
  • 1x Cable with JST connector for power and Servo connector for Video/Audio In
  • 1x Cable with JST connector and USB connector

  • Antenna connection: RP-SMA connector
  • Output impedance: 50 ohm
  • Output power: 600mW(28dbm)
  • Power input: 6-24V
  • Audio bandwidth: 6.5Mhz
  • Input level: 1Vpp
  • Operating Temperature: -20~80°C
  • Transmitter size: 45 * 22 * 15mm
  • Transmitter weight: 11g

The above specifications are provided by the GoolRC, and when it comes to size and weight - they are quite accurate.

...Continue Reading
Posted by schumixmd | Oct 07, 2016 @ 02:00 PM | 11,058 Views
Posted by schumixmd | Oct 05, 2016 @ 03:56 PM | 11,327 Views
Let's assume, you have all the components needed for your new build, for which you are anxiously waiting to finish, but you don't have the speed controllers! Which one will you choose from all the offers available on the market?!

To your attention, I want to present, what seems to be a new speed controller from quite a new player on the market - GoolRC 12A Brushless ESC with 5V/1A BEC which runs BLHeli.

  • Brand: GoolRC
  • Continuous current: 12A
  • Burst current: 18A @ 10s
  • BEC: 5V/1A BEC
  • Power supply: 2-4S LiPo battery
  • Size: 25 * 15 * 4mm
  • Weight: 8g

The above specifications are provided by the GoolRC and they're not far from the reality.

In fact, the weight of the ESC is 9g. While the size of the PCB is 27.15mm x 14mm (the heat shrink length is 40mm), the ESC on it's ticker place measures 5.6mm.

These ESC's have Silabs F850 as main CPU, so they run fine with BLHeli firmware.

For the FETs they use, what it looks to be - AON7534. These FETs are rated much higher than 12A, but the performance at 70degree Celsius can drop down to 16Amps. So, I would not run them on bench for long times but don't see any problem in flight, while they get enough airflow to cool down.

...Continue Reading
Posted by schumixmd | Oct 03, 2016 @ 01:21 PM | 11,529 Views
Ok guys, I have the received the RadioLink CP620 Charger from Banggood.

First of all, my subjective opinions.

The packing should be improved, not because the charger is fragile, but because the humans that work for post offices are (your word come here)

There is enough space in the box before it will reach the charger, but anyway, I would suggest Banggood to repack it with a cardboard box, instead of simple bag.

...Continue Reading
Posted by schumixmd | Oct 01, 2016 @ 05:00 AM | 13,800 Views
Hi folks,

This time I will tell you my opinion about the Eachine Ripple FPV EPO 864mm Wingspan All Terrain RC Airplane PNP sold by Banggood! They kindly offered me one for review in exchange of an honest review, for which I want to thank them.

  • Wingspan: 34’’ – 864mm
  • Length: 46’’ – 117mm
  • AUW: 36-38 oz. – 1020 – 1178g
  • Wing area: 471 sq. in – 30.387 dm2
  • Wing loading: 11.6 oz./sq ft - 35.40g/dm2

Few introductory words about the plane.

The Ripple is a seaplane originally, however Eachine or Banggood have decided to say that this is an All-Terrain plane, because it is designed to take off and land on just about any type of terrain – grass, snow, water. Of course, I’ll have to prove before accepting that – so I do think it is a nice challenge for me, or anyone else who owns this plane.

There are discussion that Ripple is a copy of Polaris seaplane. In fact they look identical and also the Polaris name is mentioned in the One-page-instruction they provide, but it also looks similar to HobbyKing Skipper XL. At the end of the day, all these three have identical airframe.

But, going into politics is beyond the scope of my review. If you want to read who is who, the Polaris seaplane Parkflyer thread is a good place to start reading.

What’s in the box:

First of all, I want to say that this was the best packed plane I have ever received from Banggood. The original box was packed into one additional box. There were few dents here and there, but...Continue Reading
Posted by schumixmd | Sep 29, 2016 @ 08:56 AM | 15,155 Views
Hi everyone,

Lately REDCON started to release a bunch of different receivers for different brands. They got my attention just because they are much more affordable that original receivers.

The latest receiver I was offered to review by Banggood is REDCON CM703 2.4G 7CH

This is a 7ch DSM2/DMSx receiver with PPM out, which is the best feature of this receiver in my opinion, and at 8$ - let's agree it is more than affordable and a good competitor for all other compatible receivers.

Some specs borrowed from the site:

Brand Name: REDCON
Item Name: CM703
Band: 2.4G
Channel: 7
Operating Voltage: 3.3V-9.6V
Modulation: DSM2/DSMX
Dimensions: 47 x 24x14 mm
Weight: 10g (4.8g Naked)
Brown-Out Voltage: 4.0v (Always supply power above this voltage)
Antenna Length Main RX: 13.5cm (2)
Expected Range: 800m (tested with JR DSX9)
PPM Output: Yes (support RC multicopters)
Compatible Transmitter: JR and Spektrum DSMX DSM2 transmitter
Output: 7 channels with PPM Output
Antenna gain: 3dbi gain antenna, 15dbi gain amplifier.

Stronger anti-interference ability and farther control range.
Patent pending Model Match prevents flying a model using the wrong model memory (feature does not work with module systems)
Servo Sync (feature does not work with module systems)
Preset failsafe system
Quick Connect
Compatibility (Spectrum and JR DSM2 /DSMX): DX6I,DX7,DX8, DSX7,DSX9 DSX11

...Continue Reading
Posted by schumixmd | Jul 27, 2016 @ 06:33 AM | 11,243 Views
While testing the new AOKFLY FR2205 motors, wanted to try some new moves and had a bad crash. Lucky me, the only damage was the camera and lost the video from Mobius because the card popped out.

While searching for new camera and checking different reviews, I was not so much impressed about the RunCam Owl. Did not feel the real advantage versus slightly increased price.

So, decided to buy a proven by many pilots camera - PZ0420.

Posted by schumixmd | Jul 13, 2016 @ 02:12 PM | 11,810 Views
Beside of FPV, from time to time, I fly LOS, just to maintain my basic skills.
When it comes to Line of sight flights I prefer gliders.
When It comes to gliders - DLG is an old dream of mine.

To enter this discipline, is not cheap at all, if you want to start with a competition grade glider. Even a low end glider will cost a fortune.
I was lucky to get a second hand Blaster 3.5 from Vladimir's model. It was crashed but nicely repaired and not as pricey as new one.

My dream came true.

Here is my first try to launch a DLG, in not so smooth weather.
My camera girl was making fun of me - and I have spotted that at home, while watching the video

Blaster 3.5 Discus Launch Glider: Lift me up (4 min 0 sec)

Posted by schumixmd | Jul 09, 2016 @ 05:29 PM | 13,808 Views
REDCON CM651 is just another Spketrum compatible receiver. Banggood kindly sent me one to give my though about it, so I'd like to share it with you guys.

Firstly, the package should have included:
  • 1x REDCON CM651 receiver
  • 1x REDCON Satellite
  • 1x Bind plug

Well, I said "should" because the binding plug was missing, but I don't think that's a big deal, isn't it?

Now, before we go further, let's check the specs:
  • Band: 2.4G
  • Channel: 6CH
  • Material: Plastic
  • Modulation: DSM2/DSMX
  • Dimension: 21.6x30.1x12.3mm
  • Weight: 10g
  • Voltage: 3.5-9.6V
  • Receiving Antenna Length: 30mm
  • Compatible with all the Spektrum and JR 2.4G transmitter.(Not compatible with Spektrum EU version)
  • Compatible with DSM2/DSMX transmitter and expansion transmitter module.
  • Compatible with Devo10 ,DX6I , DX18,DX7,DX8,DX9 transmitter.

To be more precise the receiver measures 34.5mm x 22.75mm x 12.9mm and the satellite measures 26mm x 20.4mm x 6mm. The satellite extension cable is 18.5cm long.

Since this is a 6ch receiver with a satellite, I have classified it as an alternative for Spektrum's AR6210 receiver. Both have the same specs, except that the original is 3.75x times expensive.

I have put the receiver thru various tests and I think nobody will be surprised, but the CM651 mimics exactly the same functionalities as the original AR6210, including:
  • Full Range Receiver
  • Model Match
  • Telemetry capable - tested with TM1000
  • SmartSafe Failsafe - which by the way I don't like!
  • LED Hold Indicator
  • Brownout detection

The only feature I miss in this receiver is the cPPM which because very popular, and I do use in all my FPV planes/quadcopters.

My final conclusion is that this receiver deserves it's place on the market, and I will use it as long as I need, instead of an original receiver. At this price, even OrangeRX is not able to compete.

I know about the war Horizon is making against, what they call "counterfeit" products, but as long as they're original receivers are overpriced I'll keep to use the cheap ones!
Posted by schumixmd | Jul 01, 2016 @ 07:13 AM | 12,367 Views
I received a call this morning. I was so glad to hear the voice of the post-man, like he's the only I wanted to see today
Later he showed up to my office to bring a package. Of course I knew what I was expecting so I could not resist to open the package.

Received a set of FR2205 2400kv motors from AOKFLY which they sent out for test and review.

My first impression: That's definitely a very well packed and the best box I have ever seen for a motor.

AOKFLY does not want to look like just another cheap company releasing cheap motors. So I would Congratulate them for good start.

Posted by schumixmd | Jun 15, 2016 @ 09:04 AM | 12,242 Views
Hi everyone.

well, as you might know, the weather in Europe this summer is not so generous to us(even now is still raining), therefore I had to delay the maiden a few weeks, then I was not able to bring the team together due to the unavailable free time for all.
But I couldn't postpone it forever, and I decided to do it by my self - (therefore the video quality is suffering, sorry for that ).

I've only had two flights on that day, that's why I do believe it is too early to have the final conclusion, but I would like to already share some remarks:
  • the plane is flying slow - good for aerial video
  • single motor pusher version - no underpower problem. Twin version will be even more efficient.
  • there is still a lot of space inside for batteries and electronics.
  • the parts are aligned perfectly. If the plane is assembled correctly no trims are needed.
  • perfect for long range flights
  • good angle for FPV camera and camera behind the dome (runcam in my case).

The only cons I have identified so far, is that with all the weigh in the front, GoPro, RunCam, 2x3000mah 3s batteries, Video Tx, the AP and DragonLink Rx on the CG and additional saving the weight from the tailboom holder - the plane was in balance - or keen to have aft CG.

Most probably a gimbal in front or twin motor setup will be slightly different.

I invite you to watch the video.
You can turn your favorite music on if you don't like to listen to my annoying voice.

SkyEye by E-do Model: Successful maiden (17 min 29 sec)

I will definitely do some adjustments and will have some more flights, afterwards I will come with follow-up videos. So, please stay tuned...
Posted by schumixmd | May 09, 2016 @ 06:58 AM | 12,759 Views
Well, the tail was the first part that I have assembled after receiving the plane. As I said – there were no manual in the box, but it also has one interesting feature which makes it a little bit – different.

The plane has a feature called vertical landing. That means the horizontal stabilizer has the ability to deflect upwards. I am still not confident that this would work. From videos on the internet, I would say it is a fast controlled crash rather than landing .
Thanks to designers – they made it possible to lock it in place with two bolts.

After understanding where all the pieces have to be installed/glued the assembling is straight forward....

First of all, I have glued the fiberglass reinforcement on the horizontal stabilizer.

Then I have glued the corresponding fiberglass reinforcement on the fixed part of the tail. This part also acts like a stopper, so that the stabilizer does not move down – only up.

A carbon rod will be inserted thru the moving part (horizontal stabilizer) and the fixed part. It will make the axis/shaft for the stabilized to move on.

Also if one wants to disassemble the tail for easier transportation – the spar could be removed by pushing it out with a screwdriver, or anything round of that size.
...Continue Reading