Bix3 crash in auto mode (log included)

Hello all,

In the last couple of months I have utterly destroyed two Bixlers. Needless to say I need some advice.

The last crash went like this. The auto mode was set up to fly a trip around the ball park at an altitue of 60 meters (approx. 200ft). When I put the plane in auto mode on the ground the prop went spinning and she took of in a head wind. Then the plane climbed to an altitude of maybe 5 meters (approx. 16 ft) and headed for waypoint 1. The altitude remaind way too low and the turns where way to wide. About 300 meters (approx. 1000ft) wide! Given the low altitude and the wide wide turns the plane eventually found a tree and exploded into pieces. Luckily I was able to recover most of the expensive parts.

My setup:

  • Bix3 kit with Small Parts CNC motor mount
  • 2200kv outrunner motor
  • 6x4 CCW prop (mounted with the text to the front)
  • 2200 mAh LiPo as power source in the nose
  • 2200 mAh LiPo payload to counter balance the tail weight in the nose
  • The plane was balanced at the proper point
  • The servos where centered so that the ailerons, flaps and rubber where level
  • The plane was set to be in auto mode the whole time, from start to crash, any change in mode was from the Ardupilot

My two main questions are:

  • Why did the plane not climb to the required 60 meter (approx. 200 ft) ?
  • Why did the plane take very wide turns and went off track so far?

I really hope you people can help me because I have destroyed two Bixlers and would rather not have this happen a third time in a row.

Thanks in advance.

2016-04-03 15-01-38 80.bin

2016-04-03 15-01-38 80.bin.log

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Moderator

    I have to ask, have you done test flights in FBW-A and Loiter? At what angle does the plane climb in FBW-A with at 80% throttle and holding full up pitch? Are all your control surfaces moving the right amount? What amount of elevator up/down is recommended?

    Have you also done an autotune?
    In your log the pitch lags behind and below the desired pitch, towards the end requesting 15-17° and getting 4-6°.

  • Hi,

    Thank you for your help. I have bought a new Bix3 and will try this.



    Jakub Mędrzycki said:

  • One additional remark: the Arduplane seemed to respond sluggish to keeop the plane level. When I had the plane in my hand before flight I noticed the sluggish movement of the servos like the Ardupilot was giving just a little bit of input.

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @TinkerGen_: "The Tinkergen MARK ($199) is my new favorite starter robocar. It’s got everything — computer vision, deep learning, sensor…
Monday
DIY Robocars via Twitter
Monday
DIY Robocars via Twitter
RT @roboton_io: Join our FREE Sumo Competition 🤖🏆 👉 https://roboton.io/ranking/vsc2020 #sumo #robot #edtech #competition #games4ed https://t.co/WOx…
Nov 16
DIY Drones via Twitter
First impressions of Tinkergen MARK robocar https://ift.tt/36IeZHc
Nov 16
DIY Robocars via Twitter
Our review of the @TinkerGen_ MARK robocar, which is the best on the market right now https://diyrobocars.com/2020/11/15/first-impressions-of-tinkergen-mark-robocar/ https://t.co/ENIlU5SfZ2
Nov 15
DIY Robocars via Twitter
RT @Ingmar_Stapel: I have now explained the OpenBot project in great detail on my blog with 12 articles step by step. I hope you enjoy read…
Nov 15
DIY Robocars via Twitter
RT @DAVGtech: This is a must attend. Click the link, follow link to read the story, sign up. #chaos2020 #digitalconnection #digitalworld ht…
Nov 15
DIY Robocars via Twitter
RT @a1k0n: Got a new chassis for outdoor races (hobbyking Quantum Vandal) but I totally didn't expect that it might cause problems for my g…
Nov 11
DIY Drones via Twitter
First impressions of the Intel OpenBot https://ift.tt/36qkVV4
Nov 10
DIY Robocars via Twitter
Nov 9
DIY Robocars via Twitter
Excellent use of cardboard instead of 3D printing! https://twitter.com/Ingmar_Stapel/status/1324960595318333441
Nov 7
DIY Robocars via Twitter
RT @chr1sa: We've got a record 50 teams competing in this month's @DIYRobocars @donkey_car virtual AI car race. Starting today at 10:00am…
Nov 7
DIY Robocars via Twitter
Nov 6
DIY Robocars via Twitter
RT @a1k0n: Car's view, using a fisheye camera. The ceiling light tracking algorithm gave me some ideas to improve ConeSLAM, and having grou…
Nov 5
DIY Robocars via Twitter
RT @a1k0n: To get ground truth I measured the rug, found the pixel coordinates of its corners, calibrated my phone camera with my standard…
Nov 5
DIY Robocars via Twitter
RT @a1k0n: @DIYRobocars is back in December, but outside. Time to reinvestigate ConeSLAM! I rigged up a quick and dirty ground-truth captur…
Nov 5
More…