schumixmd's blog - RC Groups
schumixmd's blog View Details
Posted by schumixmd | Jan 11, 2017 @ 05:22 PM | 3,699 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 @ 09:34 AM | 4,058 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 @ 03:00 PM | 4,498 Views
Posted by schumixmd | Oct 05, 2016 @ 04:56 PM | 4,575 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 @ 02:21 PM | 4,438 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 @ 06:00 AM | 6,093 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 @ 09:56 AM | 8,451 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 @ 07:33 AM | 4,664 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 @ 03:12 PM | 4,956 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 @ 06:29 PM | 6,060 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 @ 08:13 AM | 5,764 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 @ 10:04 AM | 5,561 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 @ 07:58 AM | 5,806 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
Posted by schumixmd | May 07, 2016 @ 05:00 PM | 7,288 Views
The wing is the most interesting part of the Sky Eye, because of its profile.

E-do model came with a profile which I have not seen before on FPV airplanes. It looks very promising from the aerodynamic point of view.
The wing has a very nice camber line – and if you don’t know what this means – I would like to directly quote the Wikipedia:
Camber is usually designed into an aerofoil to increase the maximum lift coefficient. This minimizes the stalling speed of aircraft using the airfoil. Aircraft with wings based on cambered airfoils usually have lower stalling speed…

The camber works as you would have the flaps down – that’s why the stall speed is lower and the lift is increased. But it has also a down side – the cruise speed is also lower – therefore if the plane is intended for long range flying – it would take a little longer to travel the same distance compared to a plane with flat profile, e.g. Skywalker or X-Uav Talon. That’s why long range on this plane can be really boring

Personally I like to soar in the thermals more than doing long range stuff, so I am confident that this summer I would beat my record – climbing above 1.8km without motor. I can’t wait… but before that, I have to finish building the plane

On the wing, there is no much to do. First of all, as you probably noticed already, I have glued the end ribs on the both halves of the wing.
I’ve also glued in two reinforcing carbon spars, the...Continue Reading
Posted by schumixmd | May 07, 2016 @ 12:19 PM | 6,612 Views
Hello guys,

Few months ago Henry from E-do Model announced their new airplane which they called SkyEye.

The name suggests from the start that this is a plane intended for FPV, and is the very common on planes which are designed for this purpose.

I liked the fact that the announcement went together with close-up pictures and videos of the plane, not only the 3D model, that way we can see better what this plane is up to – and to be honest, it got my immediate attention because I saw few features that looked very interesting. I will talk later about each one.

So, I have contacted Henry to arrange for me a sample for review.
He agreed to provide me a prototype and here the journey begins…

As always, EMS refuses to ship in my country so I had to find a workaround. The plane was sent to my family in another EU country and from there it was sent to me by bus – 2000km.

The plane arrived without a dent or scratch. It was only covered with one layer of bubble wrap and there were a lot of free space in the box. That let me think that the EPO foam out of which the plane is made, is strong enough and does not deform easily. But packing should be improved by just a little bit.

Happy to see it, I have started to build it right away, well – almost right away, because I was busy with another project that I had to finish I was according only few minutes/day, for which I have to sincerely apologize to E-do model guys and especially to Henry.

The unboxing video I...Continue Reading
Posted by schumixmd | Mar 08, 2016 @ 05:51 AM | 5,611 Views
Just another video with the FMS Butterfly.
Actually this is the first successful maiden flight with some bonus footage at the end.

FMS Butterfly Review: Maiden flight (4 min 0 sec)

Posted by schumixmd | Mar 02, 2016 @ 03:10 PM | 6,014 Views
FMS Buterfly Review: Courtesy of (7 min 44 sec)

For more details please check the Review thread -
Posted by schumixmd | Sep 29, 2015 @ 02:35 PM | 6,643 Views
One more written review from my side.

I hope everyone will like it. Please comment and/or share.
If for some reason you didn't like it, please let me know, I'll be grateful and will try to improve in the future.

You can read it, right here -

X-Uav One EPO Black Deluxe PNP: Maiden flight (5 min 18 sec)

Video review will follow next weeks if the weather will not get worse.
Posted by schumixmd | Sep 06, 2015 @ 04:25 PM | 6,571 Views
Flying for fun is always fun Crash at the end.

ZRM250 Fun flying (2 min 32 sec)