Motors spinning up with props on

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Dylansoup

Member
Okay,

So about 3 months ago I bought the stuff to build my first Quad, they took 2 months to arrive but I finally built it, with many things going wrong, such as one of my esc smoking itself, one of my motors becoming unbalanced and my flight controller frying itself, so as you can probably guess I’m am very frustrated With this project, I have spent much more money replacing broken parts than I wanted to. However, I have finally built it:

FC: dys f4 pro v1
Motors: t-motor f40 pro III 1600kv
ESC’s: Hobbywing 20A
Props: Emax avanflow
Camera, foxeer razer mini
Vtx: Eachine TX5258
Tx and Rx: Flysky fs-i6 with the 6ch Rx

So after many hours of research and building this thing it’s finally ready, I take it out to my garden, arm it and throttle it up, it begins to spin violently and gain altitude, so I disarm... this doesn’t work, it’s continues to gain altitude until cutting out and smashing into my shed roof, amazingly nothing got broken, but I squished the battery a bit, I then went into betaflight and saw that all of my motors were turning the wrong way, so I make them turn the right way, I also properly setup this arming switch and a failsafe, but I’m still nervous to take it out again.

I haven’t had a chance to fly it again, but I have plugged the battery in and pinned it to my floor with my hand and armed it, the propellers spin perfectly and don’t seem to have any issues, but as soon as I raise the throttle even a really small amount, they start to spin up, I guess they would reach max, but I disarm it before they get to fast.

I have 2 batteries and used the Un-squished one for the testing

Any help would be so amazing, I am very fed up and just want to get into the hobby, I’ve been really excited about this, but keep getting disappointed a lot. Thankyou in advance

Dylan
 
holtneil

holtneil

Well-Known Member
Moderator
Hi we all have had had days in this hobby , start with the battery if it's damaged get rid as soon as possible damaged lipos can catch on fire
as for spinning up if you now have motors spinning in the direction that's right for your set up you should be able to increase power till you get a smooth take off you only need to get 6 inches off the floor to see if it's going to fly nice , if it makes you feel better fly over long grass this will make any mishap a non damage one
 
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Dylansoup

Member
I’ll try that as soon as I can, but I’m still worried that it’s going to fly out of control, as I said when I hold it to my floor and throttle up and then let go of throttle, the motors Increase in speed by themselves ( with the propellers ON ) why is this? Will it not just fly upwards and out of control if I take my hand of it? Surely it would if they get faster by themselves?

thanks
Dylan
 
wafflejock

wafflejock

Well-Known Member
The flight controller expects that when it applies throttle to a given motor that edge of the quad is going to be lifted if it is pinned down or has no props then it has no control authority so it gives throttle and nothing happens that it expects so it gives more throttle. Basically the FC is very smart but also very dumb, it only knows what you tell it and it does the best it can with the gyro data and the control input to drive the motors to reduce the error from the target angle.

Before even giving it throttle if in angle mode can use your right stick to just push the quad forward then back then left then right and verify it responds correctly without flipping out (just stand like 10 ft back just in case and be ready to disarm).

Everyone does go through growing pains was talking to a buddy earlier about 3D printed frame and open pilot on naze board I started off with which was a wobbly mess for more than one reason but live and learn and build better quads as time goes on :D
 
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Dylansoup

Member
Ah okay, so is that the PID loop and the gyro telling the quad “ahh you should be in the air, make the motors go faster”?
Okay, I will try that later, I hope it works, Thankyou very much for the help, I really hope it works.
 
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