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zhesto's blog
Posted by zhesto | Dec 11, 2014 @ 10:27 PM | 1,643 Views
Bought BLHeli 4-in-1 ESC from Bangood - a friend of mine told me. that the individual ESCs are replaceable. Well, they are not - it is just a monolithic plate with all ESCs on it.

Still, my acro quad build became more clean. And BLHeli solved my synchronization problems with that sh*tty RCX 1804 motors i used - trying to drive them with SimonK B-12A ESC was giving me headaches from months - not spinning at all on start, stopping in mid-fly...Happy now, no more such problems with BLHeli ESCs.
Posted by zhesto | Dec 11, 2014 @ 12:41 AM | 1,790 Views
Trying to fly FPV. Not easy... Tried different platforms until now - build ZMR-250, planes, but my current preferred one is a small 16cm tricopter.

First I made a small "all in one" video combo - $10 vTx module from Banggood and $20 600TVL 120degree wide angle camera from SurveilZone. Like it sooo much - small, light, can put it on all my aircrafts.

Then I decided to build a small scratchbuild tricopter - ZMR-250 is great, but I'm still an FPV newbie - it is too fast and powerful for me. For first time tried CC3D - like it, very easy to start with, default settings are good enough for me. A small LOS video of the tri outdoor -
Mini Tricopter outdoor maiden flight (1 min 57 sec)

Pretty happy with my FPV platform now - cheap, light, mobile. Made also a "base station" for it - holding the tri itself, Devo 7E Tx and 9" monitor with RC305 vRx embedded.
Posted by zhesto | Mar 20, 2013 @ 02:17 AM | 2,344 Views
I think everybody needs a flying platform , not only cool products (RTF). What are the main platform features:
  • Cheap and widely available - the best will be something available also in your local RC store
  • Easy to maintain - lots of cheap and widely available spare parts
  • Easy to change - made from parts, compatible between different makers

So about mine platform:
  • Frame: UDI816, with 30x30mm balsa tree on the top for sticking boards with different positioning (UDI816 vs H36 for example)
  • Arms: UDI816, because they come with motors and motor caves are strong enough.
  • Propellers: what ever is available around, but I like UDI816 and X4 ones
  • FC board: H36 (SkyFly compatible), X4 (6-axis, great for beginners) etc. with added plugs

Part of the platform advantages are extended motor plugs and additional plugs to the FC boards. I know they looks a little ugly, but believe me, the maintenance (trying different boards and frames) is sooo much easier!

So ya, tell me about your platform and why it is better than mine

Interesting links

Posted by zhesto | Mar 04, 2013 @ 08:33 AM | 1,983 Views
I made a small multirotors presentation for our local HN Kansai group. Slides are available on Slideshare. There are also some event's pictures on Facebook (flying quads included ).

Useful links

Posted by zhesto | Feb 27, 2013 @ 05:08 AM | 2,095 Views
I have some parts laying around, so I made a little XS quad (hm, is XS the right type?):Next step is to add #808 camera on the bottom of the balsa body

Update: I forgot to put some interesting links in the end
Posted by zhesto | Feb 12, 2013 @ 11:06 PM | 2,396 Views
In order to consolidate my flying setup, I bought FlySky FS-TH9X-B transmitter (and 9x Solderless Programmer Board) and flashed it with er9x firmware.
companion9x EEPROM editor and simulator automated most of the boring tasks - download, fuse settings etc. Works great on Mac too (good for me ).
Now I can fly most of my quads with one transmitter. On the picture below:
Using ER9X with WLToys V929 Beetle post was very helpful.
Definitely RTFM first (several times is even better) - Er9x user guide, Installation Instructions: 9x Programmer Board

A small note about setting throttle cut with er9x:
  • Go to model settings, page 5 (mixer)
  • CH3 (throttle), [LONG MENU], [Insert]
  • Source: HALF (new name for MAX), Weight: -100, Switch: THR, Multipx: Replace

Some V929 settings specific notes (model settings):
  • Page 10 (Templates): Channel order: AETR
  • Page 6 (Limits): CH2 - INV
  • Page 5 (Mixer) - throttle cut (see above)
  • Page 4 (Expo/DR): CH1 - AIL, CH2 - ELE, CH3 - THR, CH4 - RUD
On page 4, the different rates modes can be set too. Global switch is GEAR - changing LOW/MEDIUM rate.
Every channel can be switched to HIGH with separate switch (ELE, AIL, RUD)

UPDATE: Binding

- V939
  1. Switch on the quad
  2. Switch on the Tx with [BIND] button pressed
...Continue Reading
Posted by zhesto | Feb 07, 2013 @ 03:04 AM | 2,098 Views
It was pretty rough day (and night) yesterday I broke two propellers (on Turnigy PCB and on U816 micro quads).
First, there was my Turnigy PCB micro quad: I was unprepared for the KK2.0 behavior on low voltage - the quad just turned upside down with propellers still spinning on full speed! I had a low voltage alarm, but I thought I still have time...
Next, because my U816 had some strange noise, I decided to replace one of the propellers (because the quad was constantly going it that direction, so it was the motor or the prop). I put a new propeller, but it broke after 1 sec of flight!
Maybe the hole was too tight for the shaft...

Lessons learned the hard way:
  • Trust your low voltage alarm!
  • Carefully choice your propellers and never use too much force to put them on the shaft
  • Never try fancy moves, when it's late night (all story happend after midnight, so as a result I'm pretty sleepy today...)

I replaced the propellers of my U816 quad with Nine Eagles Alien Drone ones and I should say it is flying very, very well! Pretty happy with the change.

Off topic: some interesting links from all around:
Posted by zhesto | Feb 04, 2013 @ 05:35 AM | 2,254 Views
If you own a Turnigy Integrated PCB Micro-Quad, you maybe have a problem with too small holes on the propellers (1.8mm hole for 2.0mm propeller shafts). I made a tool, similar to the mentioned in the forums post, from a screwdriver. The lady in the near home center told me, that they do not have tools for manual drilling, so I bought a screwdriver and a drill shaft (hm, is this the right word in english?) and combined them in a new type of tool

Next task is to enforce the arms weak point and I'm ready to fly. Maybe a little epoxy, power tape and parts of chopsticks will do the job... Should I also wrap the ESCs in tape?...
Posted by zhesto | Feb 04, 2013 @ 05:22 AM | 2,791 Views
Meet my first frankencopter. His name is Franky
  1. Main board - V939. for motor connections see Daryoon's post
  2. Frame - U816 (modified, see below)
  3. Arms and motors - U816: 2x CW and 2x CCW from Banggood

Because U816 board and V939 boards screws geometries are different, I reversed the U816 board upside down and cut the battery cave. This gave me nice, flat surface.
After this I sewed the board to that surface and put a drop of glue in the ready sew (very advanced technology a ). My wife made a lot of fun of me, sewing, but the result is light and strong connection, so I'm happy.

...Continue Reading