Motor Surge/Drop Off While Flying In Circles

I have a Tarot 650 Sport quadcopter that I built. It uses an APM flight controller and is powered by four MN3220 T-Motors, which require 6S power.I have flown this several times, but recently made a few mods/adjustments, including adding 15"x5 carbon fiber props. I wanted to test it's flight endurance, using a 6000 mAH lipo, so I charged the battery pack and took it out to the field for a timed flight.

3691366014?profile=original

My plan was to start the stopwatch as I took off, retract the landing gear and put the aircraft in Circle mode and have it fly continuously in circles until the voltage failsafe was tripped and it returned to land. As soon as I put the aircraft in Circle mode, the motors behaved oddly - surging and dropping off; the aircraft wobbled a bit. I was soo spooked that I lowered the landing gear and took over manually. In a hover, everything seemed to be okay, so I put it back in Circle mode. The behavior returned, though not as bad - I let it continue flying in circles until the Failsafe was tripped and it returned and landed - the motors seemed fine during the landing sequence.

I had another quad, a modified Parallax Elev-8 that was similarly equipped; during a flight, it suddenly wobbled and essentially fell out of the sky, crashing and destroying the aircraft. I never figured out what happened and I'm afraid of repeating this with the Tarot.

Does anyone have any ideas  what could be going on? 

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

Join diydrones

Email me when people reply –

Activity

DIY Robocars via Twitter
RT @_JonMyer: 🚨Attention DeepRacer's including #UndergroundDeepRacer🚨 Check our our LIVE stream that including @IAM_dbro Take a few moments…
Wednesday
DIY Drones via Twitter
RT @MarvelmindMaxim: Extreme precision for 60 swarming robots. #marvelmind #autonomousrobotics #robotics #swarmrobotics #rtls #ips #indoor…
Aug 3
DIY Drones via Twitter
RT @MarvelmindMaxim: Precise (±2cm) tracking for racing boats and autonomous boats. Works outdoor and indoor. #autonomous #AutonomousVehic…
Aug 3
DIY Drones via Twitter
RT @MarvelmindMaxim: Helping PixHawk folks to fly autonomous quadcopters using PX4 and ArduPilot. https://marvelmind.com/drones/ Equally suitab…
Aug 3
DIY Robocars via Twitter
RT @chr1sa: The @DIYRobocars @donkey_car virtual AI car race is starting in 15 minutes! Watch it live on Twitch https://www.twitch.tv/mossmann3333 htt…
Aug 1
DIY Robocars via Twitter
RT @chr1sa: Don't miss our monthly @DIYRobocars @donkey_car virtual AI car race tomorrow at 10:00am PT live on Twitch. Head-to-head racing…
Jul 31
DIY Robocars via Twitter
RT @sparkfun: Our completed tutorial on building an @NVIDIA Jetson Nano-powered @Sphero RVR gets your bot up and running via teleoperation…
Jul 30
DIY Robocars via Twitter
RT @SmallpixelCar: Freeway test https://t.co/4V5tV9lhIP
Jul 29
DIY Robocars via Twitter
Very small autonomous cars racing, thanks to an overhead camera: https://control.ee.ethz.ch/research/team-projects/autonomous-rc-car-racing.html
Jul 29
DIY Robocars via Twitter
Jul 29
DIY Robocars via Twitter
Jul 29
DIY Robocars via Twitter
RT @chr1sa: Don't miss our virtual AI car race this Saturday! Real developers + virtual cars =🏎️🏎️🏎️ Head-to-head battles with thrills, sp…
Jul 28
DIY Robocars via Twitter
Jul 27
DIY Robocars via Twitter
RT @usashirou1: Jetson nano by Isaac Kaya #jetson https://t.co/Mu1N0CyQkN
Jul 23
DIY Robocars via Twitter
RT @GPUsolution: JetRacer mady by Iflytek company #JetsonNANO #Nvidia https://t.co/MimTymIwge
Jul 23
DIY Robocars via Twitter
RT @openmvcam: I love this: Mega or Mini? Image Classification on the 1MB OpenMV Cam H7 by Ish Ot Jr. in OpenMV, Edge Impulse, Internet of…
Jul 23
More…