Bernoullis
lvl.1
Flight distance : 4938 ft
United Kingdom
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DroneFlying Posted at 2017-8-17 05:19
Maybe I'm overlooking something but I don't see any difference in the various photos you posted other than the fact that on DJI's product page the cage appears to be sitting upside down. Can you clarify what the change is that you suspect occurred and what holes you're talking about covering up?
I do know that I've consistently heard that the Mavic is noticeably louder when using the propeller cage. I'd guess that's probably caused by the motors having to spin faster to create the same amount of lift with smaller propellers, and if that's the case then I doubt there's anything you can do about it. I certainly wouldn't be inclined to try to "improve" the cage (or the noise level associated with it) by covering parts of it with tape or anything else.
"I do know that I've consistently heard that the Mavic is noticeably louder when using the propeller cage. I'd guess that's probably caused by the motors having to spin faster to create the same amount of lift with smaller propellers ......"
I am willing to bet that a major part of the increased noise is due to airflow interference between the tip of the props and the circular wall of the cage, be it the earlier solid one, or the apparently newer one with holes in it noted in this thread. Don't forget that the props rotate at very high RPM and generate substantial vortexes on the trailing edge, particularly near the tips. These high-energy vortexes will interact with anything close to them, like the circular cage wall, thereby generating noise (and drag!).
The 7728 model props used with the prop cage are specifically designed for that accessory. The standard Mavic props are the 8330 model, which are, I believe, slightly longer and therefore have a more tapered chord toward the tip, which will also help make them a little less noisy than the 7728 model. |
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