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schumixmd's blog
Posted by schumixmd | Apr 06, 2015 @ 04:10 PM | 3,363 Views


X-UAV One was one of the most awaited planes at the start of this season.
It got a place in our hearts by two unique features, not seen on the market until now.
All FPV pilots around dream about a plane that will have an unobstructed view of the camera while they're not limited on the propeller size.
X-UAV came with a solution for that request - boom prop assembly - and on top of that they included an extra feature that made their plane unique - virtually indestructibly foam from which it is made, and in the nose they pre-installed a servo gimbal. I will talk later about all of them.

Usually I do video reviews starting with the "Unboxing part", but this time I didn't resist and opened the box right away, much more I started to build it in the first night.

What's in the Box:

Anyway, at least let me list what was in the box.
The ONE came in a shipping box only. The shipping weight is only 2.2kg. Still there were room in the box for few extra bubble wrap material, but they decided the foam is so indestructible that it does not need it.

In the box I have found:
  • Small manual with few pictures showing in general how to assemble the plane, and 4 pages of warnings about LiPo batteries and other unneeded stuff for anyone except a beginner.
  • A long glass fiber wing spar - while the box is only 110cm long the spar is 122cm. Actually this is the only picture of the box that I have, which shows how the spar was fit in the box.
  • Another shorter glass fiber wing spar.
  • The fuselage itself.
  • The carbon tail-boom with the boom prop assembly and two servo extensions for rudevators servos pre-installed.
  • The v-tail parts.
  • A piece of soft plastic pre-molded so that it can be glued underneath the plane, to protect the belly on the landing.
  • A bag with some hardware, push rods, clevis, horns, hinges, bolts, two pieces of glass fiber for the wing and bolts, two more servo extensions, three pieces of sticking tape and a zip tie. Virtually everything needed to assembly the plane - except electronics.

Posted by schumixmd | Mar 02, 2015 @ 03:00 AM | 2,376 Views
Foxtech HorzonHD v4 review Part 3: RX Connection (9 min 56 sec)

Side note to the video:
The problem described, I was able to reproduce only using DragonLink RX's I have.
I was not able to replicate the problem with Spektrum DX8 and OrangeRX 6ch.
Posted by schumixmd | Feb 14, 2015 @ 03:18 AM | 4,148 Views

Few times I've been asked how to calibrate the Current Sensor on MFD AP, and why I do it so.
First of all I would like to begin with calibration procedure:

1. Disconnect everything from AP
2. Connect camera and video tx to AP. Alternatively you can connect video output directly to monitor/goggle.
3. Connect RX to AP via PWM or PPM and power the RX from a BEC connected to a LiPo.
4. Connect current sensor to your AP via 4 pin cable.
5. Power the AP from any 3s lipo, can be the same used to power RX in point 3.
6. Now your AP should work and you must see the OSD on the screen.
7. Connect a LiPo to current sensor. Be sure there is nothing connected to CS except lipo and the sensor is connected to AP as per point 4.
8. In AP go to Sensor Settings
9. With a multimeter measure the voltage on the lipo connected to current sensor
and then calibrate the voltage in menu(SENSOR SETTINGS -> CAL. VOLT ), so that you see the same voltage on the screen
10. Your done! Disconnect everything and connect as you need, try and report back if it worked for you.

Now, why it is needed to follow this procedure - Actually it is for beginners that will ensure maximum accuracy of your calibration.
Shortly this procedure can be explained like this: before calibration you should ensure no current is flowing thru CS, that means nothing should be powered via CS.

The calibration procedure stores in AP the value that CS IC outputs when the current draw on CS is 0(zero). But if you will have something powered from CS (video tx for example), then that amount of current drawn will be considered as 0 and it will not be calculated later in flight, and the OSD will show smaller values for Instant current consumption and Cumulative milliamperes.

Posted by schumixmd | Jan 29, 2015 @ 02:39 PM | 2,984 Views
Well guys,
before buying a SpiroNET Patch I decided to test one, but no one near me is flying FPV, so I had to improvise!
My improvisation was to made one myself. Of course the performance will not be as original one, but at least I'll have an idea.
Don't think #ImmersionRc will kill me for that ... I hope.
On the first one, I have made a big mistake and made it mirrored. Maybe it will be LHCP but I am not sure, and I had to correct it fast because the weekend is coming. The second time I decided to make two at a time

Cutting double-sided PCB.
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Applying antenna template on PCB.
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Etching the PCBs in 100ml Hydrogen Peroxyd + 100g citric acid + salt
...Continue Reading
Posted by schumixmd | Dec 30, 2014 @ 01:47 AM | 2,225 Views
I have never ever requested things like this. I was every time trying to solve everything by myself, but now I can't do it all alone.

My friend need help of all generous peoples around, therefore I would like to post this request also here.

The link on IndieGOGO campaign is bellow. This has nothing related to RC. All you get back from this contribution is my input to RC community.

Sorry guys, I know this is absolutely off topic.

Thank you all and Happy New Year!

Update 19/01/2015: Unfortunately the campaign until this moment didn't raise any funds, and my friend asked me to close the campaign since a new campaign was started by a local Non-Profit organization.
Posted by schumixmd | Dec 28, 2014 @ 01:12 PM | 1,734 Views
Well, I have finally come to a conclusion, and here is what I think: Motor Review - Part3: Conclusion (6 min 10 sec)

Posted by schumixmd | Dec 21, 2014 @ 11:52 AM | 2,219 Views
660mm quad with FPVModel MC-3508 700kv motors on 3s. Not intended for acro flight.

Killin'It (3 min 40 sec)

Posted by schumixmd | Dec 13, 2014 @ 12:16 PM | 3,108 Views
Today I have test flown the FatCat quad for first time. I called it FatCat because it is a little bit on heavy side. Take off weight was 1550 with 3s3000mah pack, mobius, and ET eLogger. I had two fresh charged packs with me, and aimed for a 5min flights.

This weren't just hover flights, nor 3d flights, but somewhere in the middle, and everything LOS.

Long story short:
- in both 5 minutes sessions I have consumed around 1400mAh of 3000.
- hover power is averaging 160watts.

Here I am attaching logs from both flights and the predictions from with T-motor MN3508 so everyone can compare how FPVMoldel motors perform versus T-motor. I would say - they are performing the same but cost different.
Posted by schumixmd | Nov 28, 2014 @ 02:33 PM | 2,365 Views Motor Review - Part1: Unboxing (9 min 18 sec)

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After speaking with the seller, I have identified that the blue paste inside the motor is actually balancing material. Which means that these motors comes already well balanced.

Posted by schumixmd | Nov 27, 2014 @ 04:44 AM | 2,976 Views
Got something to work on. So surprised that I couldn't resit to post a photo.
Stay tuned for updates.

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Posted by schumixmd | Aug 28, 2014 @ 03:19 PM | 3,450 Views
Well guys, not that I have reinvented the wheel. I am just proud that after 3 years I have finally built it, my UHF Relay that will allow me to use DragonLink v1 module with my Hitec Aurora 9 or Spektrum DX8 wireless and trouble free.

The most important point is that because DL v1 does not have auxiliary head tracker port I wasn't able to use Fatshark head tracker because Aurora does not support it, but on Dx8 the trainer port was busy with DL module. Now, on the DX8 the trainer port will be free and I will be able to finally use the tracker, of course - after I will get an ppm capable spektrum receiver.

UHF Relay Box (3 min 37 sec)

Posted by schumixmd | Jul 09, 2014 @ 07:43 AM | 4,319 Views
Hi everyone,

so, our friend HobbyKing shock us again with their new product.
This time they listed an alternative to GOPRO camera at 1/3 of it's price.

Turnigy HD ActionCam 1080P Full HD Video Camera w/Waterproof Case

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Posted by schumixmd | Jun 07, 2014 @ 02:02 PM | 4,297 Views
Not much to say! Went out for slope soaring!

Slope and thermal soaring with Phoenix2000. (3 min 35 sec)

Posted by schumixmd | May 25, 2014 @ 07:40 AM | 3,395 Views
Today we went flying around!

No more testing, only enjoying the scenery, but noticing so high thermal activity we did not resist to see if this plane is good to go thermals.

The answer is quite clear - the plane is quite good for thermals, much more if you try to work them out. We didn't put any effort. We just flew around the mark where plane climbed throttle off. Kinda fools, but look how it goes.

Sorry for the bad quality. Still can't get decent quality from EasyCap Someone willing to donate a DVR?

Skywalker Naja Working Thermal (4 min 44 sec)

Posted by schumixmd | May 11, 2014 @ 02:11 PM | 3,862 Views
Today, on a calm day, took the Naja for some short testing.

After the maiden flight I have improved it a little.
  • Installed new motor NTM 3530 1100kv, instead of old Turnigy 3536 1300kv. The propeller remained the same 10x4.7.
  • Relocated the vtx from tail boom to the wing.
  • Relocated the GPS and Rx on the main plywood plate more forward.
  • Removed 90g of ballast which was needed to obtain the CG at 80mm from LE.
  • And some more ground tuning of MyFlyDream Autopilot. The Autopilot also got version 1.4 firmware.

Voila! Now the CG is at the same spot but the plane is 100g light.

The plane got many modifications so I was a little worried how it will go, 'cause I was alone, and had to hand lunch it by myself, which I never did with this plane.

I engaged LAUNCH mode on MFD AP, got full throttle and launched it. The plane climbed smoothly with only little left banking (1-2 degree).
- Amazing! I flew over 20 minutes with a 3s 5000mAh tuning the AP. I wasn't afraid anymore to hand lunch it after every landing, 'cause launch mode worked like a charm.

With a single battery I have done all the testing and tuning I was hopping for, but still got a lot of time until full sunset. So I decided to go for an endurance flight.

Loaded 3s2p 3000mah (6000mah total) and took off.

Unfortunately I still have not invested in a DVR since I am in hobby. Every time more important things got in front. Also the MFD AP doesn't log the flight. So I don't have any proof of my flight...Continue Reading
Posted by schumixmd | Apr 28, 2014 @ 10:04 AM | 3,881 Views
Hello guys,
Some time ago, I was given the chance to review a new plane on the FPV scene. The plane comes from the well know Skywalker company. Considering the reputation of their previous plane which is in service for most FPV pilots, the expectation for the new plane are, let say – high enough.
Ladies and Gentlemen – Skywalker Naja is the plane I am going to review.
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Here I have the chance to say Thank you! to store, which kindly provided the plane for review and a big personal Thanks to Jason, who had the patience to work out the delivery method, since the delivery carrier asked a very high price to deliver the box to my country and I had to find an alternative way.
The plane was sent to Italy then forwarded to me by bus.
Upon receiving I didn’t wait too much, and opened the box right away. All foam parts in the box were intact and in very good shape, they even perfectly aligned straight out of the box, thanks to the pre-molded alignment points.

The list of parts in the box:
  • Wings, as you can imagine, they were two.
  • Main fuselage, as you might suppose, two halves of it.
  • Carbon tail rod with very long servo extensions, and some plastic assembly parts installed.
  • Carbon spar which hold the wings on the fuselage.
  • V-tail foam assembly parts.
  • Foam canopy for the lower fuselage bay.
  • Plastic cover for the upper fuselage bay.
  • Plywood plates to be glued inside the fuselage.
  • Plastic motor mount.
  • Packets with 4 pushrods, y-
...Continue Reading