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Thanks a million for your suggestions my dear friends! I'll try all of them and let you know if I notice anything worth mentioning.

Yes, some of them were new batteries. How should I calibrate them properly? Is there a general rule for throttle calibration that applies for most (almost all) makes and models? I have decided to replace the motor as well but it is certainly not worn out because this helicopter has seen no...

I tried different batteries but it has nothing to do with the battery. My other helicopter flied perfectly with the very battery that caused my brushed V912 to drop from the sky. Today I tested my brushed V912 with my Brushless TX. I didn't feel any noticeable improvement in throttle input...

Dear Tony, As I said, I have 2 versions of V912: Brushed & Brushless. Yes, the brushless version has a separate ESC but the one I'm talking about here is my brushed version which has a throttle problem. The brushed V912 doesn't have a separate ESC. This is the picture of my brushed PCB...

Thanks a lot for your answers. Dear rdsok, I have found this instructions for calibration. What do you think? V912 TX Calibration Just want to describe the calibration of equipment, which was accidentally discovered forum chain tu4kin , with the active support of all branches of the 912...

Really? I didn't know it. Where is the ESC of my brushed V912? Is it inside the transmitter? I don't see any ESC inside the helicopter.

Thanks again for your help Tony. This time it is my BRUSHED V912 not brushless one. It doesn't have an ESC. I should test it with another transmitter but could it be the main motor itself which is faulty?

Dear friends, My brushed V912 has a problem. It's throttle response is NOT linear and progressive. When I give it throttle (even near full throttle), it revs up a little and then after 2 seconds it suddenly revs up quite fast! This hesitation is really annoying and makes it uncontrollable at...

I have both V911 & V912 but V911 is only good for indoor flight. V912 can withstand wind much better. That's the brushed version of V912. The BNF brushless version is 20k more expensive. I really enjoy disassembling and replacing parts. I like to restore broken things. It is not only more...

I forgot to say that I even lubricated the motor and it improved its performance just a little. So, according to what you said the first thing to do is to find an ESC and replace it.

It doesn't mention any brand on it. Can I use other ESCs with 20A rating?

It is a 20A ESC. I found these pictures of it:

I'm sure it's not the battery pack because I tested other packs and it didn't solve the problem. This problem happened only after 27 flights. I had a crash after 27th flight and this weird problem occurred.

I lent my friend's transmitter and tested the throttle but noticed no difference. As you see in the picture, the ESC is hidden behind a cover and I can't see what's inside but I will tell you this. The ESC of this chopper is placed between the PCB and the battery and it must have been pressed...

Thanks for your advice Tony but I tried another battery and the problem still exists. Let me put it this way: Before the crash it required about 50% throttle to keep hovering but now it needs about 70% throttle to hover at the same altitude. This is the ESC:

Hi everyone, I'm new to this forum and hope you can guide me. I have a WLtoys V912 (Brushless version) and had a crash with it. I feel that it's main brushless motor is not as powerful as it used to be. It still works but doesn't rev as fast as before and the helicopter gains altitude slower...

Hello everyone! I'm a RC helicopter enthusiast and joined this forum today. This is my helicopter which I tried hard to buy! I have some problems and joined here to seek help.