Quadcopter not getting full power from transmitter?

T

TrpMbl

New Member
Hi there, I posted this same question over here: https://dronepilots.community/threads/quadcopter-not-getting-full-power-from-transmitter.114/ but I'm not getting any replies, so maybe you guys can help?

I've been having a problem with my DIY quad getting power. It won't lift up off the ground when I'm controlling it with my Taranis qx7 transmitter. I don't think the problem is motor/prop power in general though because I can hook it up to betaflight and control the motors manually with this screen:

Screenshot_1.png

And using the manual master control I can get the quad to generate enough power that I can feel it pushing up on my hand. I hung it up to test it in another way and it rose very quickly there too (uncontrolled obviously). So why is it that I can't get the thing to take off when controlling it from a receiver?

I have the Maximum Throttle set to 2000 in the Configuration tab of Betaflight and my Thr setting is set to 100 in the INPUTS tab on the Taranis.

I also tested it in all the modes I have: horizon, angle and airmode.

Is there something I'm missing here or is my transmitter not sending full power?

Thanks in advance!
 
Dugdog47

Dugdog47

Well-Known Member
Calibrate the escs? Using dshot, oneshot etc.? Checked in to blheli to make sure escs look okay? Using a smoke stopper? (I actually freaked once when I had the same problem lol.)

Many different things could cause this.
 
Dugdog47

Dugdog47

Well-Known Member
Also, I recently did a "retro build" where the outdated escs I was using wanted the min and max throttle to be set to a specific number, they wouldn't work til I did that.
 
RENOV8R

RENOV8R

Well-Known Member
What does it look like in the receiver tab in Betaflight. When you move your stick to full throttle, is it going all the way to 2000 in reciever tab?
 
wafflejock

wafflejock

Well-Known Member
Have props off when bench testing in general you don't want to slice up your arm or your face if this anything bigger than a 3" agree though check for receiver tab getting to 2000 if it doesn't can use the rxrange command in the terminal to get and set new min/max values that the FC should expect from the receiver and map from 1000-2000

Only other thing I can think of is throttle curve adjustments in the PID tab but would check receiver out first.
 
T

TrpMbl

New Member
Hi thanks for the replies guys. The receiver tab shows that it goes up to 2000 and I tried the ESC calibration but I couldn't get it to play any of the chimes that people said it should play.

I think it's just that my thrust to weight ratio is too low and when it tries to control the quad's attitude it would just not have enough excess thrust to hold itself in the air. This is an experimental build so the thrust to weight ratio is pretty low for a reason, but I guess it's too low.

That's what I think it is anyway, if you guys don't think its this then let me know.

Thanks again!
 
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