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- Mar 19, 2023
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Hi All,
Everything on my latest FPV drone build works except for the throttle control. The motors spin faster and faster while the throttle is engaged. If I move the throttle down again, the motors get slower but not as slow as when the throttle was in the same position before. It's almost like the throttle input range is drifting upwards. Once the motors reach a certain speed, even returning the throttle right down won't stop the motors. The longer I let them speed up, the faster they speed up. This issue still persists when propellers are attached and the drone is airborne.
I'm using my ESCs with PWM protocol because I haven't got SBUS working yet. Still on PPM. They've been throttle calibrated and firmware-updated to latest BLheli32, as has the flight controller been updated to betaflight 4.4.
I've checked that there aren't any obviously stupid throttle curves in betaflight or in the transmitter.
I've also calibrated the accelerometer, disabled the barometer and tested the drone in my hand to see if the motors respond to changes in orientation without "throttle runaway" as I call it. The motors were perfectly responsive and there was no throttle runaway.
I somehow doubt that any of my hardware is to blame because the pitch and yaw work fine and the rotors hold their speed when I keep the stick still. Even the roll control, which is on the same control stick as the throttle, is able to keep the motors at a constant speed. Hence, I don't think that the transmitter hall module is bad. This also means that the PWM and PPM transmission method are not to blame.
Are there any less obvious settings/hardware faults I've overlooked?
(images and parts list below)
esc
flight controller
2400kv motors
4s battery
receiver
transmitter
While I'd love to be asking the forum about real technical questions like getting sbus working, exploring the features on my VTX, getting battery voltage in my OSD and so on, there's no point in doing that until I can get it to fly. Hence, any help is much appreciated.
Everything on my latest FPV drone build works except for the throttle control. The motors spin faster and faster while the throttle is engaged. If I move the throttle down again, the motors get slower but not as slow as when the throttle was in the same position before. It's almost like the throttle input range is drifting upwards. Once the motors reach a certain speed, even returning the throttle right down won't stop the motors. The longer I let them speed up, the faster they speed up. This issue still persists when propellers are attached and the drone is airborne.
I'm using my ESCs with PWM protocol because I haven't got SBUS working yet. Still on PPM. They've been throttle calibrated and firmware-updated to latest BLheli32, as has the flight controller been updated to betaflight 4.4.
I've checked that there aren't any obviously stupid throttle curves in betaflight or in the transmitter.
I've also calibrated the accelerometer, disabled the barometer and tested the drone in my hand to see if the motors respond to changes in orientation without "throttle runaway" as I call it. The motors were perfectly responsive and there was no throttle runaway.
I somehow doubt that any of my hardware is to blame because the pitch and yaw work fine and the rotors hold their speed when I keep the stick still. Even the roll control, which is on the same control stick as the throttle, is able to keep the motors at a constant speed. Hence, I don't think that the transmitter hall module is bad. This also means that the PWM and PPM transmission method are not to blame.
Are there any less obvious settings/hardware faults I've overlooked?
(images and parts list below)
esc
flight controller
2400kv motors
4s battery
receiver
transmitter
While I'd love to be asking the forum about real technical questions like getting sbus working, exploring the features on my VTX, getting battery voltage in my OSD and so on, there's no point in doing that until I can get it to fly. Hence, any help is much appreciated.
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