Mittwoch, 28. Juni 2017

Fixedwing Dives in the mountains! (S800 Sky Shadow)


Perfect (almost) FPV morning! Had 4 flights and 4 controlled landings - what more can you expect? :)
Going up that peak was scary - diving it down (the goal for this morning) even more so. But very rewarding. The relaxing proximity flying over the trees was good to "come down" a bit. Hope you like it!

(I know it's shakey - this wing is probbably too small, I used some stabilization in post - but not too much to avoid that weird effect)

Sonntag, 25. Juni 2017

S800 sky shadow - or HOW I FELL FOR WINGS AGAIN...


After my review of this Wing I only did a maidenflight and got back to quadcopters soon. They are easier...
But now I wanted more flighttime, range and some of that FPV adventures I had back when I flew FPV planes.
I changed most electronics in this kit.
So if you're interested: get the foamparts only (50$) at banggood and forget this stabilizer, or the cheap cam/VTX they sell in the full kit. The motor seems ok, the ESC is terrible as well...

After these flights here I even installed my Arkbird Autopilot/OSD for more advanced missions - but that's another story (to be seen here soon). I also did some amazing dives with it - stay tuned!

Donnerstag, 22. Juni 2017

Runcam SPLIT: FLIGHT Footage, Jello, Mounts, weight savings!

Tech Specs: (similar to the Runcam3!)
Weight 23g.
1080p60 + Low latency FPV + WDR
$69.99  (+5$ for Wifi option)
no wide voltage, only 5V!




More findings:
Transfer speed over USB: ~ 15mb/sek
so a typical 5min flight will generate little over 1GB means ~ 1.5mins.
Not optimal - ok if you have to place the board inside inaccessible (USB needs to be accessible of course!)

Jello: with that small lens module jello (vibration "waves" in the video) will be picked up easier since the low mass is moved by vibrations easier as if you would have a bigger mass (like a heavy HD cam).
I tried different mounts, only after I swapped that one really bad prop it was ok. I didnt see this vibrations with that faulty prop on my gopro style SJCam 5000x before!

Downlink video is fine to fly - latency low enough for my taste!

My Vortex 250 is now 83gr lighter (from 532 to 449gr) - this is a lot on such a copter and effects it's flight characteristics and efficiency! It's really "floaty" now and should give me longer flighttimes. Combined with endurance motors/props and larger motorarms this could be a really good longrange setup!

Freitag, 16. Juni 2017

Most accurate FPV cam latency test method? and: eliminate interference in your downlink video



My most accurate FPV Cam latency test setup:

2 channels (curves on osci):
ch A = video signal (NTSC)
ch B = 12v powersource for my LEDs   (I think I dont measure the actual switch on, but rather the time when it "consumes" the 12v. Would be interesting to know how much time does it take the LED to light up?)

Measure the delay from LED switch and the "effect" from a dark cam image to a RED LED light screen (noticable effect on the video curve).
This way we still have the 17ms steps of time resolution since we only see 60fps on NTSC. So we cant measure cam latency more accurate than in 17, 34, 51ms...
BUT: until now I used a LCD screen to read the VIDEO signal changes (and the screen also runs a certain FPS - so this is not accurate anymore - better to "read" the video signal directly without a LCD).

FPV Cams Latency overview:  (June-2017)     (also available as XLSx File)





Interesting Links:

Mittwoch, 7. Juni 2017

eFlite Rare Bear FPV

It started like this: as the only FPVer on the field I always end up chasing planes with my quads. I wanted to do some more LOS flying (line of sight, normal RC stuff...).
So I re-activated my eFlite "Rare Bear" racer plane (they really like this plane on the field!). After the first flight session I thought to myself: "what if I mount a runcam3 on it, and use TV out to my VTX? The installation was quick and easy, works nice. Just have to get the plane flying smoother in higher winds to enjoy it more... (maybe I have to install a stabilizer?)



Plane:
=====
eFlite RARE BEAR   http://bit.ly/2sDnfUg
Wingspan: 88cm
Prop Size: 8x8 Electric
ESC: 70-Amp
Battery: 3300mAh 4S 14.8V 50C LiPo ~ 5mins flighttime

FPV:
====
just a Runcam3 (yes, I know they're out of stock cause they have this problem with Gopro...)
TVOUT cable to ImmersrionRC VTX
Power source: 3 of the 4cells off my main battery (12v) from the balance plug. Super easy!

Mittwoch, 31. Mai 2017

DYS Elf - tiny brushless drone, indepth crashtests for 2 weeks

Great little indoor (and outdoor on low wind) copter! Powerfull almost acrobatic, should be 3cell capeable. Use of brushless motors increases the efficiency here!
Definitly the best indoor copter I've tested so far in this class below 10cm (83mm motor to motor).

One of the best features: you can fly this almost anywhere and stay legal. You can't possibly harm someone with this tiny drone, but the flying feels good, locked in and controllable - gives you a good FPV feeling!


get it here: Banggood  (►►8% off coupon: ToysHo)

Tech specs:
==========
Motors: BE1102 10.000kv
ECSs: BLHeli, DShot, 10amp
Battery: one 600mah 2cell with 25C  ~ 4-6mins
Flight Control: F3
Props: 1735 five bladed (1.7")
800tvl 170° FPV cam
5.8ghz 25/200mw  (comes in 200mw mode, can be set to 25 with removing a "solder-jumper/bridge"
88gr, 2mm carbon frame supported with  durable plastic frame
Receiver: Frsky Type D8

MinimOSD integrated, so you can set PIDs and other settings on the field! See Battery voltage and get "Low volt" warning.

TIPS, Mods:
==========
Remote is setup nice, maybe you wanna adjust the expo/rates.
Binding to Taranis was a huge gain for me (more precision).
Binding is easy, just power on copter without remote - it goes into bind mode. Then use BIND option in Taranis with D8 mode...

Antenna / Videolink: 
  200mw get wasted here because the antenna is flat mounted under the board beneath the battery - terrible placement!
Remove Battery cage, use velcro instead and get Antenna out (careful). Increases range and quality, will not decrease the multipathing here since it's a linear antenna...

Control Link: 
had no issues / failsafes in my flights but I wasnt that far out...

Feet / structural integrity:
use some foam to have the landing gear protected against hard landings (which will transfer too much stress to the motor arms). Maybe also use some foam ontop the copter. Ducts of props are made of durable plastic!

RCGroups thread about this copter

Mittwoch, 24. Mai 2017

Hughes 500 chased with my Drone

Thanks Norbert - for risking your Copter :)

TECH SPECS of that nice scale-heli:
=============================
Rumpf: ALIGN MD500 BREITLING HUGHES 500
Base: T REX 500
Motor Scorpion 1400 KV
Rotorhead: ALIGN 4 BLATT
ESC: YGE 90 LV with 6Volt Fan
Blades: BLATTSCHMIED HALBSYMMETRISCH 425MM
1.800 RPM/min
Battery: Lipo 6s 5000 mAh

Sonntag, 21. Mai 2017

Antennas tested in flight: Pagoda vs Aomway SPW, TBS Triumph and "normal" linear


Video index:
==========
01:31 std. antenna (linear)
03:16 std. ant. multipathing test
03:56 AOMWay SPW
06:22 AomWay multipathing
07:09 TBS Triumph
09:01 Triumph multipathing
10:02 PAGODA
11:47 Pagoda multipathing
12:49 Range test with 30db ATTENUATOR
13:41 Atti and Std. Antenna
14:39 switch to AOMWay
16:05 switch to TBS Triumph
17:14 switch to Pagoda
19:14 Atti+std.Antenna and 2xPagoda on Goggles VRX
21:15 CONCLUSION
24:20 -- 4 antennas DIRECT COMPARISON footag!!! --

Multipathing:
When the video transmitter (the copter here) emits the RF signal - it goes straight to your receiver (line of sight!) and also gets reflected off some obstacles (like the big building here).
The reflections do arrive at the receiver slightly later (longer way) so the RF waves (direct and reflected ones) will either "add up" or "null out" each other. Interference occurs and distorts your video image.

Circular polarization helps here, because the reflected signal will be "filtered away" almost completely.

Sonntag, 14. Mai 2017

...like it was made for powerloops!

Nice spot right outside of work, own parking lot AND dedicated powerloop gate wich is also a scenic picture frame :-)

The flights in sunny conditions wer BEFORE I tuned this quad better (using the tips from Joshua Bardwell regarding PID Filters).
The Evening flights at home were just to try the quad out - less wind here as well - but very smooth after PID filter tuning.
See: https://www.youtube.com/watch?v=PHkofDq_JxU
to get rid of propwash oscillations in Betaflight...