RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 154 views POST REPLY
Helicopter
e-
Multi-Rotor Discussions
DJI › Weird Noise
01-07-2018 06:26 PM  4 months agoPost 1
Heli_Splatter

rrElite Veteran

USA

My Posts: All  Forum  Topic

Could you take a listen to this video and see if you can tell me why the noise is happening.
drone flys up.
4. I move the throttle stick back to the middle position.
5. There is the weird noise for around 3-5 seconds.

There is also the noise when I fly backwards and then stop:
1. The right stick is in the middle position.
2. I pull the right stick in my direction (backwards).
3. The drone flys backwards.
4. I move the right stick back to the middle position.
5. The drone stops and there's the noise also the noise for around 3-5 seconds.

Watch at YouTube

PM  EMAIL  GALLERY  Attn:RR  Quote
01-07-2018 06:42 PM  4 months agoPost 2
wjvail

rrKey Veteran

Meridian, Mississippi

My Posts: All  Forum  Topic

Very Odd. The short answer is I don't know what is causing the noise. Because there are so few moving parts, there is likely a mechanical problem and really only a few places to look. I'd be inclined to look at the prop mounting - everything tight and installed the right way round? If not that, are the arms tight?

How much time on the motors? Are the bearings smooth?

Did it just start? Is the aircraft new? Did it begin subsequent to a mishap? Is there any wind in the video? Does it make the same sound if you pirouette the drone 180 deg and repeat the maneuver?

I'll stick with my first, best, answer - That is: I don't know.

"Well, Nothing bad can happen now."

PM  EMAIL  GALLERY  Attn:RR  Quote
01-07-2018 06:54 PM  4 months agoPost 3
JuanRodriguez

rrProfessor

The Villages, Florida

My Posts: All  Forum  Topic

Almost sounds like one ore more of the blades are flexing....

Can you suggest that he try another set of blades to see if it goes away ?

That would be my best guess ...

Been there, done that and old enough to know better.....

PM  EMAIL  GALLERY  Attn:RR  Quote
01-07-2018 08:58 PM  4 months agoPost 4
wrongler

rrProfessor

Brewerton, New York

My Posts: All  Forum  Topic

Motor pulsing?

Bill Whittaker

PM  EMAIL  GALLERY  Attn:RR  Quote
01-07-2018 10:05 PM  4 months agoPost 5
dgoss999

rrApprentice

UK - Lancashire

My Posts: All  Forum  Topic

Are these original props??

DG

"Believe none of what you hear, and only half of what you see." • Benjamin Franklin

PM  EMAIL  GALLERY  Attn:RR  Quote
01-08-2018 01:15 AM  4 months agoPost 6
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

That is most likely related to an incorrect PWM setting in ESC.

Motor RPM decreases under load, then speeds up when hovering.

Hard to see in video if there is any oscillation when noise is present.

Also as stated, suspect props.

~~Enjoying the hobby one flight at a time~~

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 154 views POST REPLY
Helicopter
e-
Multi-Rotor Discussions
DJI › Weird Noise
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Friday, May 25 - 12:16 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online