Hi! I purchased a Vtail 500 kit with the T2216-11 motors / T18A ESCs and have assembled the drone but cannot get it to fly. I’ve read all I can (that I can find anyway) and have a problem I hope you can help with.
With a freshly charged 11.1V 3 cell LiPo battery, I give the drone full throttle. The front-left and rear-right RPMs, as indicated by the MultiWiiConf software slowly drop. Initially, all are at, or very near 2000 (with fast throttle up only), but within 20 seconds, the two clockwise blades drop to about 1450 or so. The front-right and rear-left hold pretty steady.
I also notice that if I slowly throttle up, the front-left and rear-right do not keep pace with front-right and rear-left.
When trying 50% throttle to launch, it instantly starts a clockwise rotation bumping the ground. Giving it 75-100% throttle flips the drone upside down…
I am absolutely confident I have the motors spinning in the correct direction and the appropriate props mounted, all with TOPs pointing up. I have calibrated the ESCs twice.
Can you tell what I am doing wrong? What else do you need to know? Thank you!
Hi phollins,
Welcome to the RobotShop / Lynxmotion forum.
First, how did you made those reading in the GUI while spinning the motors ? This seems very dangerous.
It is normal that MultiWii is not outputting the same signal to all the motor as it try to stabilize all the time and also react to the Gyro input.
Can you give us a PrinScreen of your GUI when you don’t touch anything of your Transmitter ?
Also some pictures of the VTail would be helpful too.
Let’s solve your problem… 
Eric,
Sorry for the delay, I’ve not had much time to work on this…
I was mistaking the readings in the GUI as motor RPM when they were just the transmitter/receiver signals. Sorry for the confusion.
I believe my main issue had to due with the fact that I had plugged the transceivers battery in connector to AUX2 (d12) and had “#define RCAUXPIN12” in the Ardino’s config.h. And maybe upside down at that! It appeared to cause some kind of auto rotation action…
Anyway, I moved the battery in to the receiver to AUX1 and I had lift off! I still need to work on the balance, but every seems good for now.
Thanks for your help!
Good to know you got it working.
I am not sure i understand you about the battery thing… maybe with a picture ?
