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New silent propellers
480 33 2017-10-7 11:46:14
fans689722dd
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Some time ago I read somewhere that the propellers on the new Phantom ( which one I don't know ) were redesigned to make less noise. Anybody tried it out yet? Can I mount them on my Phantom 4?
2017-10-7 11:46:14
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Landbo
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If you replace the word Phantom with Mavic, you remember correctly. There's a "new" Mavic in a different colored shell, it has props that is less noisy. New noise-free props for Phantom can only be dreamed so far.   

Regards Leif.
2017-10-7 14:42:31
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ALABAMA
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The phantoms will always buzzzzzzzzzz
2017-10-7 15:13:25
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Geebax
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The title is misleading, there is no such thing as a silent propeller.
2017-10-7 15:14:58
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DJI Susan
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Sir, the new silent propellers is only available for Mavic. We have not got such news for Phantom.
2017-10-7 19:15:55
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repairman
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DJI Susan Posted at 2017-10-7 19:15
Sir, the new silent propellers is only available for Mavic. We have not got such news for Phantom.

yea susan i dont think the p3p is noisy at all,but maybe im slightly hearing impaired.
2017-10-7 20:29:26
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Genghis9
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repairman Posted at 2017-10-7 20:29
yea susan i dont think the p3p is noisy at all,but maybe im slightly hearing impaired.

Blah ha ha ha
2017-10-8 02:22:43
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hallmark007
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Mavic now sounds like a Prius, Phantom still sounds like a Porsche.
2017-10-8 02:27:10
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dancopter
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New Mavic props are slightly longer. Not sure if there is room to make the Phantom props much longer also?
2017-10-8 03:17:59
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Labroides
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dancopter Posted at 2017-10-8 03:17
New Mavic props are slightly longer. Not sure if there is room to make the Phantom props much longer also?

Mavic props spin a lot slower too.
That's why they are quieter.
2017-10-8 04:23:41
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DustMan
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hallmark007 Posted at 2017-10-8 02:27
Mavic now sounds like a Prius, Phantom still sounds like a Porsche.

I like your answer lol
2017-10-8 05:36:30
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fans689722dd
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Oh I see, it's only for the Mavic, thx.

It would be nice if the Phantom 4 would make less noise. I sometimes hear it when I'm at 500m altitude ...
2017-10-9 04:11:25
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Dockater
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fans689722dd Posted at 2017-10-9 04:11
Oh I see, it's only for the Mavic, thx.

It would be nice if the Phantom 4 would make less noise. I sometimes hear it when I'm at 500m altitude ...

Wow, how often are you 500m above your your p4, and how?
2017-10-9 04:41:36
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MrRobert5823
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Labroides Posted at 2017-10-8 04:23
Mavic props spin a lot slower too.
That's why they are quieter.

Interesting... I wonder what the RPM's are.  
Hovering...
Ascending...
Descending...
2017-10-9 07:48:30
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MrRobert5823
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fans689722dd Posted at 2017-10-9 04:11
Oh I see, it's only for the Mavic, thx.

It would be nice if the Phantom 4 would make less noise. I sometimes hear it when I'm at 500m altitude ...

500m above ground level?  That's pretty high.... (in the US that's a bit too high)  I can't hear mine if it's 80m right overhead... But I agree it's loud
2017-10-9 07:49:56
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Antonio76
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Geebax Posted at 2017-10-7 15:14
The title is misleading, there is no such thing as a silent propeller.

When my aircraft's propellers are not mounted and rotating, then they are VERY silent...
2017-10-9 08:03:43
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Antonio76
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dancopter Posted at 2017-10-8 03:17
New Mavic props are slightly longer. Not sure if there is room to make the Phantom props much longer also?

I wonder what would happen if the UAV propellers had some sort of winglets on the tips... would it improve lift, reduce noise, etc?
2017-10-9 08:10:50
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AlanHd
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Antonio76 Posted at 2017-10-9 08:10
I wonder what would happen if the UAV propellers had some sort of winglets on the tips... would it improve lift, reduce noise, etc?

Has anyone got a 3D printer to find out
2017-10-9 09:10:03
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Dockater
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Antonio76 Posted at 2017-10-9 08:10
I wonder what would happen if the UAV propellers had some sort of winglets on the tips... would it improve lift, reduce noise, etc?

  

Winglets on wings help because they increase the volume of air on which the wing can act. Increasing the wingspan would actually be more efficient but is often not possible. The aspect ratio of a wing is also a factor, thin aspect ratios like those that propellers mostly have gives little advantage. Larger diameter slower rotating propellers would reduce sound significantly, but this means a larger drone. Lots of compromises, check out some of the aerodynamic forums about. One further option is the use of ducted fan type systems. Again, the experts are many and varied, I am sure drone manufacturers are aware of the options.

  
Check out the web and youTube for replacement propellers, there are several but I have not found many convincing arguments.
  
2017-10-10 00:51:43
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DJI Susan
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hallmark007 Posted at 2017-10-8 02:27
Mavic now sounds like a Prius, Phantom still sounds like a Porsche.

Ha ha, I like this answer, too!
2017-10-11 02:37:41
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MrRobert5823
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DJI Susan Posted at 2017-10-11 02:37
Ha ha, I like this answer, too!

What's the Inspire sound like?  What's the spark sound like?
2017-10-11 09:53:57
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ACW
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Mavic Pro Platinum - not Phantom...
2017-10-11 10:18:13
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DJI Susan
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MrRobert5823 Posted at 2017-10-11 09:53
What's the Inspire sound like?  What's the spark sound like?

It depends on the drone status in your heart. Actually, I do not find proper metaphor as I do not know much of car. Do you have any good ideas?
2017-10-12 03:19:10
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Maxi3D
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Don't know about Inspire sounds like, but my Sparky sounds like a souped up mini cooper.
2017-10-12 05:20:52
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Nigel_
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Maxi3D Posted at 2017-10-12 05:20
Don't know about Inspire sounds like, but my Sparky sounds like a souped up mini cooper.


I've not heard an Inspire, but the looks remind me of the Ariel Atom:

2017-10-12 08:39:51
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AlanHd
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Does it perform like the atom. 0-60 in 2.3 seconds for the V8
2017-10-12 08:45:53
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Pvt Pilot '79
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Dockater Posted at 2017-10-10 00:51
Winglets on wings help because they increase the volume of air on which the wing can act. Increasing the wingspan would actually be more efficient but is often not possible. The aspect ratio of a wing is also a factor, thin aspect ratios like those that propellers mostly have gives little advantage. Larger diameter slower rotating propellers would reduce sound significantly, but this means a larger drone. Lots of compromises, check out some of the aerodynamic forums about. One further option is the use of ducted fan type systems. Again, the experts are many and varied, I am sure drone manufacturers are aware of the options.

  Check out the web and youTube for replacement propellers, there are several but I have not found many convincing arguments.

Larger diameter propellers also have a greater tip speed than their smaller counterparts given the same RPM. When the tip speed reaches near supersonic levels is when the noise becomes very loud and that's when a propeller becomes inefficient too. Winglets basically take wing tip vortices and turns that into lift without gaining parasitic drag which in turn makes the wing more efficient so yes, in a sense they effectively increase the span of the wing too. I don't know how winglets would work on a propeller or rotary wing. I think we would have seen it by now unless I've just missed it.
2017-10-12 09:11:28
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Dockater
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Pvt Pilot '79 Posted at 2017-10-12 09:11
Larger diameter propellers also have a greater tip speed than their smaller counterparts given the same RPM. When the tip speed reaches near supersonic levels is when the noise becomes very loud and that's when a propeller becomes inefficient too. Winglets basically take wing tip vortices and turns that into lift without gaining parasitic drag which in turn makes the wing more efficient so yes, in a sense they effectively increase the span of the wing too. I don't know how winglets would work on a propeller or rotary wing. I think we would have seen it by now unless I've just missed it.

There are indeed propellers with “tips” on the market for drones and for commercial aircraft. In many cases there are advantages and the experts argue each situation exhaustively. But quite often the expert arguments tend to sound more like a discussion about whether strawberry or blackberry jam tastes better.

At the end of the day is the extra cost of design and manufacture commercially sensible?
2017-10-12 10:50:53
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Dockater
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The following illustration seams to prove that dji have thought about the problems.


  
Other people are offering alternatives like this 3 bladed propeller for the p3, basically more lift, slower speed, less noise. (Not my argument and in no way a recommendation)



  
Or this enterprising design from someone, hopefully with a 3D printer.

      
1.jpg
2017-10-12 11:56:42
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Dockater
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The following illustration seams to prove that dji have thought about the problems.



1.jpg
2017-10-12 12:07:49
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Dockater
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The following illustration seams to prove that dji have thought about the problems.

2.jpg
2017-10-12 12:10:53
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Dockater
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                  Other people are offering alternatives like this 3 bladed propeller for the p3, basically more lift, slower speed, less noise. (Not my argument and in no way my recomendation)
1.jpg
   
2017-10-12 12:12:51
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Dockater
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Or this enterprising design from someone, hopefully with a 3D printer.
3.jpg 3.png
      
2017-10-12 12:14:58
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Dockater
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Or this enterprising design from someone, hopefully with a 3D printer.

3.png
      
2017-10-12 12:16:53
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