Prop came off

Joined
Jul 4, 2018
Messages
92
Likes
8
Age
72
#1
I saw in one of the post where the fellow thought one of his props came off. I have a phantom 3 standard use the props that came with it. How do you keep a prop from coming off. It looks like to me with the way they go on they wouldn't come off but I don't know. Can anybody comment on this. Thanks
 
Joined
Apr 29, 2016
Messages
3,244
Likes
1,323
Location
Watkinsville, Georgia
#2
How do you keep a prop from coming off. It looks like to me with the way they go on they wouldn't come off but I don't know. Can anybody comment on this.
About the only thing you can do is make sure they are tightened before every flight. It is quite possible for them to loosen, especially so when braking at high speed, due to the very fast slow down of the motors which essentally loosens them somewhat. If they are not fully tightened, then they will fly off.
 
Likes: LarBear360
Joined
Jul 26, 2017
Messages
1,690
Likes
784
Location
Irvine (Orange County) CA
#3
I saw in one of the post where the fellow thought one of his props came off. I have a phantom 3 standard use the props that came with it. How do you keep a prop from coming off. It looks like to me with the way they go on they wouldn't come off but I don't know. Can anybody comment on this. Thanks
The key to avoiding prop failure is be sure they are installed correctly using the color coded dots. Black on Black, Silver on Silver. Don't over-tighten or you could fracture the plastic. The P3S ships with a tightening tool. Inspect each prop before flying.

I'v heard of a prop breaking in air, but not coming unscrewed.
 
Joined
Mar 22, 2014
Messages
4,309
Likes
1,967
Location
Los Alamos, NM.
#6
I saw in one of the post where the fellow thought one of his props came off. I have a phantom 3 standard use the props that came with it. How do you keep a prop from coming off. It looks like to me with the way they go on they wouldn't come off but I don't know. Can anybody comment on this. Thanks
As described by @Fly Dawg, when the motor is applying torque to keep the props spinning under load (air drag) then the props are essentially self-tightening. But, if that torque is removed suddenly, the angular momentum of the spinning prop can lead to the motor acting as a brake, at which point the torque on the prop thread is temporarily reversed sufficiently that an inadequately tightened prop can spin off.
 

Meta4

Moderator
Staff member
Joined
Jan 8, 2014
Messages
13,077
Likes
7,217
#7
The key to avoiding prop failure is be sure they are installed correctly using the color coded dots. Black on Black, Silver on Silver. Don't over-tighten or you could fracture the plastic. The P3S ships with a tightening tool. Inspect each prop before flying.
That's actually a prop loosening tool and is for removing stuck props.
The hub material in the prop is relatively soft and over-tightening is to be avoided as it can damage the threads that hold the props on.
 
Likes: sar104
Joined
Apr 29, 2016
Messages
3,244
Likes
1,323
Location
Watkinsville, Georgia
#9
"Hand Tight" can differ between individuals and their prospective of the definition. It's too bad they ( Meaning DJI ) do not provide an installation torque value. That could easily be done. Granted probably unnecessary, other than peace of mind.
 

New Threads

Forum statistics

Threads
130,310
Messages
1,352,278
Members
94,989
Latest member
suneth