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Master Airscrew Stealth Propellers for DJI Mini 3 Pro & Mini 4 Pro - Orange, 4 propellers in Set

£183£366.00Clearance
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Compare in the 2nd photo how far down those same left-rear blade tips have to bend to nearly touch the right-rear motor when the blades are forced to nest underneath the right-rear blades. Experiments show the drones can get twice as close before becoming a nuisance for human ears which should be great news for anyone hoping to launch Skynet commercial drone deliveries. Since the rotors are easily fabricated via 3D printing they should be easy to adapt to a number of different drones. Inspired by some of the experiments with “ ring wings” in the early 20th Century, researchers iterated on various toroidal propeller geometries until arriving at one that significantly reduces the sound produced by the rotors, particularly in the range of human hearing. The team suspects the reduction in noise is due to vortices being distributed over the whole propeller instead of just the tips. A team working at the MIT Lincoln Laboratory says it has come up with a closed-form propeller design that can significantly cut down the loud noise commonly associated with consumer drones. The configuration that the facility has gotten patented almost makes the propellers sound more like a rushing breeze rather than high-pitched buzzing — and it does so without sacrificing thrust. Despite being integral to aviation for more than a century, propellers have changed remarkably little since the Wright Brothers. A team at MIT’s Lincoln Lab has developed a new propeller shape that significantly reduces the noise associated with drones. [PDF via NewAtlas]

Measured at a constant speed of 21.6 kph in windless conditions. With DJI Mini 3 Pro Intelligent Flight Battery, the aircraft can fly for up to 34 mins. Obtained by using QBC (quad bayer coding) techniques and realized by combining four pixels into one. Cannot be achieved when shooting at 48MP. Researchers say that when they tested prototype toroidal propellers on DJI drones, they found thrust levels comparable to those of regular props at similar power levels. But reduced sound levels on the drones fitted with toroidal props meant they appeared only half as annoying as a regular drone. Or in other words, the drone sounded as if it were twice as far away. But like I said I'm new to storing it properly (at least the recommended way) so I don't have the experience to say that that would be a problem too. Tested with a production model DJI Mini 3 Pro in a controlled environment. Actual experience may vary depending on the environment, usage, and firmware version.I have not had experience with other drones. But everyone says that this is the quietest drone from DJI. They used the maximum experience to realize it. And to make improved parts separately, that would be disgusting. APAS 4.0 is not available while recording4K/48fps, 4K/50fps, 4K/60fps, 2.7K/48fps, 2.7K/50fps, 2.7K/60fps, and 1080p/120fpsvideo.

On mine, the original left-rear blades always slid easily to nest under the right-rears whenever the arms were folded with blades crossed for storage. But the fresh new blades are noticeably different and look exactly like the ones in your photos. I did see your post I haven't stored it enough the recommended way to have detected a problem. My problem was that I was careless in storing the MM in the case and I had the bottom props pointed towards the rear of the caes so they were resting on that hump and then the body of the MM was resting on them on the hump. Looking at them folded the recommended way I see the curve up towards the tips. But pressing on the ends with my finger there seems to be enough flex in the tips that I wouldn't think that stored properly the blades are under sever bending pressure. But it is a good hypothesis that the storing even the recommended way could result in the warping to the point that the prop becomes problematic and we get the prop error message. Also looking at your first photo after the MM in box photo you have the camera shield causing interference with the props I don't know if it is seated wrong or a design change since the one I have but with mine the camera shield is flush with the body of the MM as shown in the pic below

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Note in your first photo, when free, how high the tips of the left-rear blades sit above the motor hub of the right-rear motor. I had always taken care to store mine "properly" in the Fly More Case since I bought it in December. I received the occasional "Max Power" warnings, but always ignored those. It was only with firmware v01.00.0500 and the new motor speed warnings that I started paying any attention to the state of the propellers. New blades cured the issue. But the new blades also made it evident that storing the Mini with arms folded and blades crossed forces the blades to deflect. Dr. Thomas Sebastian, a senior member of the Lincoln Lab’s structural and thermal-fluids engineering group, explains that the design for these low-noise propellers comes from experimental airplanes in the early 1900s and those operated during World War 2. “There were a couple of designs that were basically these ring wings. So, I wondered what it would look like if you took a ring wing and turned something like that into a propeller.” Researchers at the Massachusetts Institute of Technology (MIT)have developed new low-noise propellers that can make current multirotor drones much less of an acoustic annoyance.

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