61

Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by trust on August 02, 2022, 03:10:22 am »

We've been buying the mini REVO flight controllers on ebay. Here's link for one:
https://www.ebay.com/itm/255629024375
They need to have firmware changed to latest version, but they work fine.

We've also developed some power & signal distribution PCBs that work with these controllers. I'll post about it separately.

62

Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by TheOtherCliff on August 02, 2022, 12:00:56 am »

https://forum.librepilot.org/index.php?topic=4965.msg33721#msg33721

There are several places that sell Revo and Sparky2 in this thread.

PorcupineRC sells them for for USD $44 and $40 free shipping.  Other places I have not personally verified recently.

63

Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by Alex H. on August 01, 2022, 08:43:50 pm »

2022 and one can't find any or only few at high prices, the Revo or sparky2...

Are there other boards that are available on the mark and can be used with librepilot?

64

Vehicles - MultiRotors / Re: Motor propeller axle is offset... Can I repair it?

« Last post by Alex H. on July 31, 2022, 11:02:14 am »

Thanks both of you for replying.

I have open up the motor, by taking the safety washer out, no magnet is out of its place, no dirt or any other parts inside it.
If I push the shaft(axle) from bottom where the safety washer is and spin the motor it will not hang anymore...

It will be good I idea to file the lower part of the rotor, maybe later I will take care of it and use it as spare part.
Meanwhile I have bought a new motor with ESC.

Just found out that I need a drone license...

65

Vehicles - MultiRotors / Re: Motor propeller axle is offset... Can I repair it?

« Last post by trust on July 30, 2022, 08:40:19 am »

Ditto on his suggestions. Another factor that I've seen is magnetic particles getting stuck inside motors on the magnets, and very hard to see. Sand is a killer, as it often has tiny iron particles that can get in there and stick to the magnets. Even just dirty areas may have tiny iron particles floating around. Very difficult to remove. Sometimes using compressed air blasted in there will move it out of the way. There are canned compressed gas "cleaners" that also might work.

66

Vehicles - MultiRotors / Re: Motor propeller axle is offset... Can I repair it?

« Last post by TheOtherCliff on July 29, 2022, 08:19:20 pm »

I have straightened bent shafts.  Spin by hand and/or slowly by battery.  It is not easy and requires careful attention...  It is good if it looks perfect to your eye.

Smooth shaft can be gripped with pliers through small piece of paper towel folded several times.  Threaded shaft you should usually put the spinner nut on and grip that with pliers through small piece of paper towel folded several times.

If it is grinding in some place it may just be dirt in the motor.  Dirt is usually obvious.  If it is obvious, take it apart.  Sometimes it is grub screws and sometimes E clips.  Else, it may be that a magnet has come loose.  Easiest is to buy a new motor.  I usually buy motors 5 at a time just for this reason (ESCs too)...

67

Vehicles - MultiRotors / Re: my Drone doesn't go straight up...

« Last post by TheOtherCliff on July 29, 2022, 08:13:00 pm »

Fix Instant Flip and Learn to Fly
https://forum.librepilot.org/index.php?topic=4408.0

68

Vehicles - MultiRotors / Motor propeller axle is offset... Can I repair it?

« Last post by Alex H. on July 29, 2022, 11:47:18 am »

Due to my drone pilot inexperience, I have damaged a little bit on of the motor propeller axle,
for which now when it's turning it is making a little bit of noise when throttle, and when hand turned I can feel it hanging in one place...

Is there a way to make the axle straight again, or should I buy a new motor?

69

Vehicles - MultiRotors / Re: my Drone doesn't go straight up...

« Last post by Alex H. on July 29, 2022, 11:37:22 am »

Yes you are right one of the motors was turning in the wrong direction, but the propeller was the right one... now it's better.
Thanks!

70

Vehicles - MultiRotors / Re: my Drone doesn't go straight up...

« Last post by trust on July 29, 2022, 05:54:01 am »

Whenever testing a multirotor for the first time there are several things you should check:
1) Using very low throttle, pitch forward and see if the back two rotors speed up, front rotors spin down. And vise versa.
2) Using low throttle, roll left and right. Roll right, left side motors should speed up, right side spin down. And vise versa.
If they aren't you have your motor  connections wrong - fix that first.
If those are ok, then test yaw - on a floor like that, you should get it to slide and rotate left or right according to the direction of yaw with low throttle and no pitch/roll.
Do all these things before lifting off the ground. If they are fine, it should lift smoothly with no pitch/roll, just throttle.
Also, do you have attitude control set for pitch and roll, and rate set for yaw? If not it'll be a lot harder to control.