Sure, blade shape isn’t everything and a lot of things can always go wrong, but what direction fan geometry will take in the coming years is very predictable and understandable. There will be hints of who is copying who for some time to come, but with the gradual demise of traditional rotors, things will calm down and we’ll get used to the “new” ones as the standard. And let’s be glad for that, this is progress in the right direction and it’s just a matter of who can fine tune the small aerodynamic details more effectively. And now let’s break down what and in what quality BeQuiet! has managed to do with Silent Wings (Pro) 4. While it can’t be said that the blades are thin, they are significantly thinner than on the competing Noctua NF-A12x25 fan. In addition, they are made from a material compared to which Noctua presented better properties and lower thermal expansion of “sterrox”. It is a polybutylene terephthalate (PBT) with 30 % glass fibre content to increase sturdiness and reduce the effect of unwanted blade flexing in flight. BeQuiet! admittedly claims that it does not occur, but it does so rather slyly as it refers to maximum speed. Und wir finden 100er Schritte ist mehr als ausreichend ich hänge jetzt schon Pro Lüfter mehrere Stunden dran bis ein Lüfter mal fertig ist. The above picture shows the 4x pre-installed radiator corner mounts removed from the fan. The removal and installation of the mounts is convenient. There are two latches on each side of each corner mount. Pressing them at a time would release the mount which then can be taken off. Similarly, place the corner mount on the fan corner and press them for installation. Who would want to be in the fan business? Incremental improvements often take years of development, margins aren’t likely to be huge, and to top it all off, you’re making critical parts that absolutely must not fail. Adding insult to injury, for most folk, a fan is just a fan, and serves a perfunctory role that is often overlooked.

be quiet! has launched new fans named Silent Wings Pro 4. These are by far the most advanced and progressive fans from the manufacturer. We all know that Silent Wings fall under the High-End category from be quiet! so one must expect something aggressive in this range and I must say be quiet! has done it in quite some style. It seems you already builded your own wind tunnel. But you may need to move the anemometer to outlet of the wind tunnel. If my understanding of your explanation is correct, the distance between the anemometer and the position for mounting fan is ~150mm, and, it is too close in my opinion. As explained earlier, the airflow pushed by a fan is a strong turbulance, not a laminar flow. You may observed the ‘bounce’ in measured wind speed values because of this reason. It is good to keep some distance(500~1000mm or 20~40 inches) and place flow straightener in a middle of duct if possible.

I’ve already devised a test that indirectly indicates static pressure and airflow (although I have NO idea how to calculate them), as well as showing which are best for intake and which for exhaust. I tried the ProtMex PT6252B to get temp (WB, DP & ambient), relative humidity, air speed and airflow, and it even allows me to enter the area (not cubed, though), but I have repeated observed erroneous spikes when testing at different speeds (min and max are all I know how to accomplish at this time, so tips are appreciated). I do a simple, open-air noise test with my phone but I need to improve it so it actually reflects what the end-users will experience instead of what they’ll experience with it blowing in their ear from 15cm away! ;P In short, the previous or say traditional shape of axial rotors, can never outperform the state-of-the-art design that minimizes the relatively inefficient sideways airflow because of the airflow angle, which pushes a large part of the streamlines well off the axial direction of airflow. It’s inefficient because there is more friction between the frame and the blades and hence more noise, which reduces what we call efficiency (the ratio of airflow intensity to noise level). Vielen Dank für den Test! Habe schon länger überlegt, mal mit neuen 140mm Lüftern auf meinem Alphacool Aurora Pro 420 rumzuprobieren. Wäre da nicht der Preis... PWM ist ja Pulsweite in Prozent %. Rechnet Ihr also für Eure Messungen die Schrittweite von 100 Rpm in Prozent entsprechend runter, also rund 8% pro 100 Rpm bei max 1200 Rpm (100%), oder etwa 3% pro 100er-Schritt für einen max 3000-Rpm-Orkan?

I was looking for further information on measuring static pressure and came across Oriental Motors, which I was surprised to discover makes fans, and they explain about their fan testing, so I wanted to share this with you. I hope it will be interesting, or perhaps useful. https://www.orientalmotor.com/cooling-fans/technology/cooling-fans-how-to-measure-air-flow.htmlEither way, the 120 mm Silent Wings (Pro) 4s look good and we are considerably more concerned about the efficiency of the 140 mm. These have two fewer blades, and such a thinner rotor may indeed achieve higher flow at lower noise, due to the larger cross-section, but only in environments with very little environmental resistance. There will be a significantly greater airflow loss on a radiator due to the significantly lower static pressure than with 120 mm models. BeQuiet! makes no secret of it either, at just 5,3 % higher airflow (87,16 m 3/h), they claim only half the static pressure of the smaller fan (0,92 mm H 2O). BeQuiet! Silent Wings 4 (140 mm) It is possible that with larger fans, BeQuiet! counts on use in cases rather than on water cooler radiators. And perhaps ones that don’t have grilles or have them circular everywhere, non-restrictive. On standard, hexagonal ones, like what BeQuiet! used in current cases, the efficiency of a fan with low static pressure will drop significantly.

Silent Wings 4 and Silent Wings Pro 4 in 120 mm format have a maximum speed of 1600 rpm and a stated airflow of 82,74 m 3/h and static pressure of 1,79 mm H 2O. We can’t confirm these parameters yet, but what we can do is set the Noctua NF-A12x25 PWM to the same speed and compare the results with each other. That's why i think they're different for various users as well, some fan controllers and PSU's simply run higher or lower voltage even in the single digit % range, and that can change a fans noise levels. I really like BeQuiet fans, but my preference is to use the much cheaper Pure Wings fans that don't have all the fancy frame and rubberised crap and cost about 1/3rd what these cost. A big improvement over Silent Wings 3 is in the mounting of the interchangeable corners. SW3 owners know well that the fuse on at least one of the corners has jammed, making it virtually impossible to swap for a different type of corner. However, BeQuiet! did not repeat this mistake and, on the contrary, the new solution is very elegant. There are two latches, and mainly on the outside. The mounting corners are no longer inserted from the side, lengthwise, but directly snap into the fan corner from above. The fixing levers/latches can be conveniently pressed from the outside, thereby removing the particular type of corner and replacing it with another. Assembly and especially disassembly has been improved considerably. Everything works easily and yet holds firmly in place, with no play. So no need to worry about any rattling (typically from unstable joints).be quiet! is using Fluid Dynamic Bearing in these fans having a life span of 300,000 hours. These bearings reduce the vibration which helps in reducing the overall noise output. On top of that, these fans are using 6-pole, 3-phase motor. A12x25 sitting in the case under my desk works fine at 600RPM, since I have only a single one of these can’t really talk about unit to unit variance, but I’m expecting these to have pretty consistent quality Today we are looking at be quiet’s new Silent Wings Pro 4 fans, a new product from be quiet that’s designed to be the company’s most “ progressive, performant and versatile” fans to date. These fans are optimised for use as case fans, radiator fans and heatsink fans, acting as the company’s best in class solution for all use cases. Und noch was: Ich weiß nicht wie einfach es für euch ist - aber ein Diagramm mit Lautstärke vs. Volumenstrom fände ich echt toll. Ich weiß, wurde gerade erst umgestellt, aber man müsste das aus den vorhandenen Daten ja eigentlich errechnen können, oder? Ggf. mit einem Skript?

Hm ehrlich gesagt wäre für mich das Aufdröhnen bei 700 und 1000 U/min eher ein Nogo oder auf jeden fall sehr, sehr unschön. Das kann ja doch ziemlich nerven. Vor allem ist das ja dann ein Regelbereich, der oft getriggert wird. Mir ist es egal, was der Lüfter über 1000 oder so macht. Meine Lüfter laufen eigentlich dauerhaft bei rund 300-400 (NF-A12x25) und im normalen Betrieb eigentlich selten bis nie über 800-900 Last. Über 1000 finde ich schon relativ laut und mitunter störend und die eigentlichen maximalen 2000 finde ich schon mega übertrieben. Also wirklich total übertrieben. Dass der 140er dann sogar 2400 macht und der 120Pro 3000. Wahnsinn. Aber ehrlicherweise muss man die Pro-Version dann ja auch nicht kaufen, schon korrekt. So I can't say that it's definitely all Arctic fans that have this problem, but I think many of them do.Interesting, I did a new build at home yesterday using two of them, and the P12s I used were very quiet - couldn't detect motor noise - all I could hear was airflow. How does one quantify the value of a better fan? Manufacturers will be eager to extol exotic numbers and airflow characteristics, yet while such measurements hold merit, enthusiasts often want to discern real-world improvements. In a separate test looking at the effect of different corners on fan performance, you’ll also learn that while the “anti-vibration” ones look technically great, they don’t reach their maximum efficiency due to certain collisions. In other words, they don’t completely isolate the vibration from the frame. In the be quiet! Silent Wings Pro 4 test on a radiator, the first thing that stands out is that the performance is hardly different compared to the predecessor in the lower speed range. However, as with the 120 mm version, they do not reach the specified maximum speeds in the different modes. Therefore, I performed the test twice in the 1100-RPM range. The first deviations that go beyond the measurement tolerance can be seen here.We have already informed you that a new generation of BeQuiet! Silent Wings (4 and Pro 4) fans is just around the corner. But last month, there was still no information that in any way pointed to efficiency figures. Looking at the design, it was obvious that it was going to be a top of the line fan, but we wouldn’t bet our bottom dollar that the Silent Wings (Pro) 4 would beat the Noctua NF-A12x25. BeQuiet!’s internal parameters claim, however, that it beats the Noctua fan handily. And especially when running on massive heatsinks and radiators of coolers.