Donnerstag, 3. Oktober 2013

Black Snapper (Globe Flight / RC Upgrade)

Tech Specs
Black Snapper, CFK Aluplatte, Landekufen, GPS Halter klappbar, RC Einbaukit
DJI Naza V2 + DJI Iosd mini
Tmotor MT4006 -13 (92gr, 740KV, Max 24A, 250W)
ESC Maytech 30 Amp
Graupner Prop 12x6 + Distanzhüllen
GF Brushless Gimbal + Alexmos Board (FW 2.2b2)

Weight (Full FPV, Gimbal, Gopro3 but without battery): 1,8kg
Folded Size: Width: 25cm    Length: 44cm     approx 13cm height (if GPS is folded down)

Naza Gains
pitch roll yaw vert
Basic 150 150 120 130 
Atti 150 150
Important: make sure your CoG (Center of Gravity) is correct. This means you have to move batteries really far backwards! If you have an hard to control copter (especially if you "yaw" fast) your CoG maybe wrong. Look this vid to see what I mean! With 2 strings I determined the CoG: PIC
I also had problems with non straight motor alignment: PIC

Flighttime: ~14-15min  with 6600mah 4cell
I use 2x Turnigy Nanotech 35C 4S 3300mah  paralell (6600mah)
Powerconsumption:  ca. 370mah / min   the flying weight is 2,4kg!     avg. 19-21Amp

Motors: great - till now I just knew normal little motors that spin 9x5 props and high rpm...
This works but it isn't efficient. You only get around 10min flighttime max...
These motors here have long cables so that the cabling can run in the carbon tubes. This gives nice installation and less air drag under the props. This reduces vibrations!

GimbalI opted to use the Black Snapper Gimbal which comes as an option here. It is controlled by the Alex Mos board which has a good reputation. Build quality is great, Gopro3 fits in well. Motors are good and what they do looks and works like magic! You get really good cam footage - no matter how the copter rocks in the wind - the gopro is straight! I ordered my alexmos board here: buy Alexmos @Austrian Shop who sells a ready soldered board!

best Alexmos Pid Settings
(Juz70 Settings, same Gimbal Motors, different Quad)
       P   I    D   Power at 12V (fed over Balancer-plug)
Roll.  9  0,12  9   88
Pitch. 5  0,14  5   78
Roll invert, 14 Poles,     Sensordirection: Y, right: X
RC settings, PWM       Pitch: RC_Pitch
Min Angle Max Angle
Pitch -35           75           Speed Mode (LPF 4)      Speed 6

Video Guide to Alexmos - good explanation cleared things up for me!
Approx double the P value of Roll vs Pitch!
I gain defines the "speed" to compensate movements...

iOSD Mini: (
Since I use the Gopro Liveout and my view is always straight I cant judge the position of the copter well in the air. You can tell if you "lean" forward or not... So the iOSD is great because it overlays an "artificial" horizont (a dotted line) that shows the copters angle. It also displays pitch and roll as numbers on top.
Great idea: the iOSD has access to all the sensor and GPS data directly from Naza - and doesnt have it's own sensors! This way you get very accurate data. You even see the num of sat's Naza hast, the Flying mode it's in and of course other OSD data like Speed, distance and height...
Most astounding: the home orientation help is really helpful here - rather than a little 3d arrow you get a fluid square floating over your home position (if you're looking in the right direction, otherwise you get a left or right arrow on the border - just see my video and you'll understand...)

Links and Info:
FPV Community Build log (german)
Official Manual from Globe Flight (German, not finished)
Buy this and all other FPV Stuff here!


Montag, 22. Juli 2013

RD450 - KK2.0 based Quadcopter

This Quad has a nice story:
after seeing a spectacular video on which I commented I chatted a little with Trinco and he offerd to send me a pre series model of the frame he built.
Update 6/2014: I feel bad about me leaving this Quad on the workbench unfinished so long. Even better does it feel now - once it flies great and powerful. My most "grown up" Quad till now. Not hightech (simple KK2, no GPS, no OSD, no gimbal) but very potent motors and the needed power for great highspeed dive videos (I really enjoyed them last year!):

It looks quite similar to the QAV400 and it has a very high material quality!
The arms are aluminium, Plates are G10.
There is a dirty section (bottom with motors, ESC and vibrations) and a clean section - both separated with rubber bobbins. It may look scary to only place your whole quad on only four screws but this way it isolates the vibrations most effectively!

==>> Buildlog

Tech Specs:
Frame: RD450 from Trinco (nice and easy to screw togethter!)
Motors: Robbe Roxxy Bl Outrunner 2834/08
Props: Graupner eProp 9x5
ESCs: RCTimer ESC 30amp SimonK flashed
Cam: TBS 69 / Gopro3BE
VTX: AvionicsRC 2.4GHz (powered directly from Balance plug of flight battery)
Weight: 1,4kg (all stuff like gopro, gelpad, but without battery) so I have a flying weight of around 2kg!

Flighttimes / energy consumption:
flying weight around 1,8kg
power consumption: 550mah / min    ~ 33amp    (on an average flight, not only hover!)
 Update: now I use SLS 5000mah 4cells and get safe 7:30mins - not much - but this air-time is awesome!

Vertical performance (measured with GPS Logger with barometric sensor):
max 50km/h VERTICAL speed!!  this really feels like a rocket seat!
Horiz.Speed is around 80-90km/h over 100km/h on fast dives...

Roll/Nick:  P Gains: 60/ Lim 100     I Gain: 30/ Lim 20
Yaw:          P 70/50    I 40/20
Stick scaling: R 50,  P 40,  Y 50,  Th.70
Min Throttle: 15 (with 10 one motor didnt spin up at the same time than the others)

I really encourage you to follow the RCGroups guide to find the right settings! RCGropus KK Settings thread

-> get the Frame here


Donnerstag, 14. März 2013

F450 KK2.0 PowerQuad

3/2013: my current little Power-Quad

This is my attempt to test out 5,8Ghz Video and KK2.0 controller for a cheap multicopter.
KK2.0 board is really nice to setup.
For the "tuning" of the important PI settings your should follow the easy tips in this guide here on RCGropus

Tech Specs:
Frame: DJI Flamewheel F450   (nice and easy to screw togethter!)
Motors: NTM2826-1200/17345 NTM Prop Drive Series 28-26A 1200kv 250Watts!
Props: Graupner eProp 9x5
ESCs: Turnigy Plush 18A
Radio: Scherrer UHF Longrange (red V antenna)
Cam: Gopro2 with liveout (100ms delay - see this video)
VTX: Fatshark compatible 5,8GHz from (powered directly from Balance plug of flight battery)
Weight: 1015gr (all stuff like gopro and gelpad, but without battery)

my KK-Settings 14.4.2013
Roll/Nick P Gain 55 / Limit 100 I Gain 30 / Limit 20
Yaw P gain 50 / Limit 20 I gain 50 / Limit 10
height dampening 0 (Limit 30)
But I really encourage you to follow the RCGroups guide to find the right settings! RCGropus KK Settings thread

Pricetag: around 230€ maybe...
F450 DJI Flamewheel Frame: 50€
KK2 Controlboard @ Hobbyking 30$
4x 18amp Turnigy Plush ESCs 12$ each
4x motors 15$ each
2x Graupner eProps 9x5 5,4€ each
and 2x left spinning Graupners 5,4€ each