Thrttle too sensitive please help

[andycorleone]

Hi, I installed new motors to my f550 they are rctimer 2212 880kv,
Im having a hard time adjusting the throttle gain, I started with the default settings I crash my f550 because of this problem thanksfully I only broke the landing gear,


the problem is the throttle is too sensitive or is too low or too high, there is almost not control between 40-80% I slowly tried to increase the throttle but I dont see any effect until after 60% alsmot instantly the copter jump like a rocket.


In manual mode the adjustment is perfect gradual


ALL: Gps, ESc, transmitter and naza is calibrated


Please any help would be great. Thanks

 

[Toymaker]

Check and see if there is some weird Exponential control setup on the Throttle channel in the transmitter.

 

[chipwich]

Hi, I installed new motors to my f550 they are rctimer 2212 880kv,
Im having a hard time adjusting the throttle gain, I started with the default settings I crash my f550 because of this problem thanksfully I only broke the landing gear,


the problem is the throttle is too sensitive or is too low or too high, there is almost not control between 40-80% I slowly tried to increase the throttle but I dont see any effect until after 60% alsmot instantly the copter jump like a rocket.


In manual mode the adjustment is perfect gradual


ALL: Gps, ESc, transmitter and naza is calibrated


Please any help would be great. Thanks

The NAZA interprets 50% throttle as level flight, so you will not climb until past that point, and as you said 60%. That is normal. So, below 50% and you are descending and you must develop the proper touch to approach and land. You don't say what transmitter you have but if it is programmable, you can create a throttle Curve which will smooth out the transition from level flight to ascent. You don't want to use Expo because it will produce the same curve above and below the 50% point, something you probably don't want. To complicate things, motor, battery, prop, and AUW can effect how your ship flies and at some point you just have to learn its flight characteristics and adjust your flying style. But programming your transmitter is the first step in finding what works best for you and your machine. Add some Expo to Ail, Rud, and Elev, and flatten your throttle curve above 50% to smooth out your climb. Hope this helps.

 

[redcloud]

The NAZA interprets 50% throttle as level flight, so you will not climb until past that point, and as you said 60%. That is normal. So, below 50% and you are descending and you must develop the proper touch to approach and land. You don't say what transmitter you have but if it is programmable, you can create a throttle Curve which will smooth out the transition from level flight to ascent. You don't want to use Expo because it will produce the same curve above and below the 50% point, something you probably don't want. To complicate things, motor, battery, prop, and AUW can effect how your ship flies and at some point you just have to learn its flight characteristics and adjust your flying style. But programming your transmitter is the first step in finding what works best for you and your machine. Add some Expo to Ail, Rud, and Elev, and flatten your throttle curve above 50% to smooth out your climb. Hope this helps.

 

[redcloud]

Hi Chipwitch, I too am using a Taranis but what kind of throttle curve would you start with. My F550 Hex is mainly used for photography and yes, I'm new to this. My problem is on decent it tends to drop way too fast and I've already broken landing gear and damaged my gimbal. I don't care if it ascends slowly, I just need to slow it down on the decent. I fly in GPS mode. I'm using a Naza v.2, Taranis X9D Plus Transmitter With X8R Receiver.

 

[OldGazer]

I'm gettin' in on this late, but Chipwitch hit the nail on the head. What Andy is dealing with is called Dead Band.

When you switch from a non-GPS flight mode like Stabilize/Auto Level to a GPS flight mode like Loiter/Position Hold, the flight controller firmware puts a Dead Band around Throttle, Roll, Pitch, and some times Yaw.

The issue here is, the initial Dead Band is based on the amount of throttle (Idealy 50%) that is required to maintain a hover.

So, in the initial configuration the FC determined the hover point was infact 50% throttle and set an appropriate dead band to use for GPS flight modes.

However, by changing to 880Kv motors (I'd wager the originals were 1000Kv or close to it...) the entire power system needs to be recalibrated to the flight controller.

If this were an APM or a Pixhawk the fix is pretty simple, you just go into the flight logs, find ThrIn when the aircraft is hovering and change the THR_MID parameter to match. The ArduCopter firmware automatically adjusts the dead bands and you're good to go..

In my case I "upgraded" from T-Motor 2814-710Kv motors swinging 1238 carbon fiber props to 4006-740Kv motors swinging 1555 carbon fiber props. The hover point dropped from 500 (50% in ArduCopter speak) to 330. Needless to say the aircraft was over powered...