I would Love to be re directed  to a link here that tells me what i need to use to add weight to properly balance a 2 bladed prop on a Phanthom..or where to take weight off a 2 bladed prop......Thank You

None of the props I've had needed any extra balancing

If you find a dji propeller off balance, you could lightly sand the letters near the hub.
Checking frequently for a newly balanced blade.


RedHotPoker

i never add weight.i remove weight from heavest blade.med fine sand paper works good.also blades are spanwise balanced as well as chordwise balanced.

Flight safety is top priority and I do not suggest to add extra weight.

This thread might give some info and tips.

This is how I balance my P4 props,
I also use a threaded shaft for P3 props.(never add weight)
https://forum.dji.com/forum.php? ... =1&extra=#pid381322

DJI Susan Posted at 2017-11-22 01:02
Flight safety is top priority and I do not suggest to add extra weight.

Dji  Susan...But adding weight in the form of a small strip clear tape OR clear nail polish Isn't that OK...seems to me  much better then sanding material away so ?
    Also i have a nice prop balancer now and i tested quite a few   "new"  DJI props and i  find them balanced nicely !

When in doubt, a heavy high speed industrial angle grinder...



RedHotPoker

RedHotPoker Posted at 2017-12-4 18:42
When in doubt, a heavy high speed industrial angle grinder...

Now are you talking about One Off a  4 blade P-51 Mustang or a little 2 blade plastic prop off a Drone  LOL...hello RHP !

Zippo43 Posted at 2017-12-4 20:45
Now are you talking about One Off a  4 blade P-51 Mustang or a little 2 blade plastic prop off a Drone  LOL...hello RHP !

Yes, full speed ahead... ;-)


Grind me a pound... Whoops, wrong forum... Ha


RedHotPoker

I would imagine that DJI prop manufacturing moulds are designed so that the props is balanced already.  Why would you want to try rebalancing an already balanced prop straight from the mould?

You can pick up a pair of props cheap enough.

Why not just replace them, and avoid any doubt about possible damage to your drones motors, through vibration, or the drone itself, should a prop fail.

props cheap enough maybe you should sand and balance before you can use them ... for safety.

I prefer to pay a little more and buy some lists to use ..

Nebuchadnezzar Posted at 2017-12-5 03:54
props cheap enough maybe you should sand and balance before you can use them ... for safety.

I prefer to pay a little more and buy some lists to use ..[view_image][view_image][view_image]

Those would look great on that new Obsidian model.

JamesWhenman Posted at 2017-12-5 05:13
Those would look great on that new Obsidian model.

Yes  indeed !!

I used them two times , and im very satisfaced

Rigger73 Posted at 2017-12-5 03:38
I would imagine that DJI prop manufacturing moulds are designed so that the props is balanced already.  Why would you want to try rebalancing an already balanced prop straight from the mould?

You can pick up a pair of props cheap enough.

Actually that is not the case for any prop manufacturer in our hobby - even APC and Master Airscrew cannot get props perfectly balanced.

Props such as these are not a single material used in construction. It is not just a case of pouring plastic to a mould. They contain fibres and construction is based on GFN - Glass Filled Nylon.

It is common practice in RC flight world - which DJI is a part of - to check balance of props and correct.

There are many ways to do it and each person ends up with a preferred method.

BUT main thing to be aware of is distribution of prop weight. Adding or reducing weight in small area can cause dynamic forces and stress. So it is usual practice to spread correction along the back of blade. This may be careful fine sanding of heavy blade along the blade length or adding varnish / nail polish to back of light blade length. It is generally accepted that blade length and pitch should not be altered.

The method where thin tape is applied to light blade is a carry over from Helicopters where two factors are corrected due to the extreme length of heli rotor blades :

Balance longitudinally of each blade and balance to each other. So the tape is often moved along one blade to correct for equal weight of each and second to get balance point of each same position out from hub.

DJI props because of significantly shorter than heli rotors - basically do not need the same balance point measurement as long as they are equal weight ... ie balanced.

Nigel

solentlife Posted at 2017-12-5 05:43
Actually that is not the case for any prop manufacturer in our hobby - even APC and Master Airscrew cannot get props perfectly balanced.

Props such as these are not a single material used in construction. It is not just a case of pouring plastic to a mould. They contain fibres and construction is based on GFN - Glass Filled Nylon.

Theirs not a engine made that don't benefit from a nicely balanced flywheel or a nicely balanced propeller.....or even the wheels on your auto OR  motorcycle !
    I speand alots of time at a small airport with many many "Vintage" planes with wood props....when their planes are in a hanger over a dirt floor they turn the prop so its horizonal  to the ground so it will asorb moisture more even ly then IF it still vertical....thats so it keeps balanced nicely !

I always use small pieces of scotch tape to balance my props been using that stuff for 30+ years Zero issues. Most props will need only a 1/4X1/2" piece of tape  these drones aren't so sensitive as to even realize that tiny tape piece is stuck to the prop so its not like it will cause a motor any harm nor will it make any one motor run faster or slower then another due to the added weight. I use a lot of Master Airscreew Props for my planes and IMO they are the best props on the market, but even those will sometimes require balancing albeit very little. most of the DJI props I have are fairly balanced but none have been perfect and I have 20 sets total. As Nigel pointed out you want to apply the tape on the backside of the prop and I usually stay as close to the hub as I can and still achieve balance.  If I cant get balance with a small piece of tape I use some sand paper to get the weight down sanding off the DJI logo is a good way to drop weight.

Epicdoom Posted at 2017-12-8 15:55
I always use small pieces of scotch tape to balance my props been using that stuff for 30+ years Zero issues. Most props will need only a 1/4X1/2" piece of tape  these drones aren't so sensitive as to even realize that tiny tape piece is stuck to the prop so its not like it will cause a motor any harm nor will it make any one motor run faster or slower then another due to the added weight. I use a lot of Master Airscreew Props for my planes and IMO they are the best props on the market, but even those will sometimes require balancing albeit very little. most of the DJI props I have are fairly balanced but none have been perfect and I have 20 sets total. As Nigel pointed out you want to apply the tape on the backside of the prop and I usually stay as close to the hub as I can and still achieve balance.  If I cant get balance with a small piece of tape I use some sand paper to get the weight down sanding odd the DJI logo is a good way to drop weight.

Thank You "EpicDoom" and all the others that have helped me and many others with how to properly balance a Quad prop !.....i very much appreciate the replies .

I watch the video where a guy used sandpaper to remove weight and if you needed to add it he used clear fingernail polish and put it mid way in the middle of the blade not a block but a stripe like you painted it with a brush whether it was correct or not I can't say he did have a balancing shut up and everything it was explaining made sense and after he put the weight on the one side the propeller was equally balanced but that's how he added weight if he ended up taking too much away and that was his example if he had intentionally took a little bit more material way in sandpapering and by doing so he used clear fingernail polish as a weight additive pretty slick if you ask me but from what I read in the threads it looks like some people are okay with it and some people just totally think that if they're off balance their trash me personally have I don't see why you can't have different blade for different things I got a set of blades I used when I started at another set that I use