It happens so that one of the most exciting fans, the Triebwerk TK-121, is discussed at the end of this review. This fan is unique not only among the tested products but among fans at large.
It comes in a small cardboard box. You can read the detailed specs of the product on the back of the package.
The fan is fixed within the box in two foam-rubber pieces. The following accessories are included with it:
There are two sets of long screws with two types of threading and nuts. There are also three cables to connect the fan (including a PATA power cable) and an advertising booklet. Like the Noiseblocker fans, the Triebwerk is manufactured in Germany. The warranty period is 3 years. The recommended price of this product is the highest among the tested 120mm fans at $34.95! Here I will be talking about the junior model of the series. Its higher-speed cousin will be covered in our next report.
The fan is a standard 120 millimeters wide and long but its frame is as thick as 55 millimeters.
Note that this is the thickness of the frame because the impeller is only 30 millimeters thick, which is larger than with ordinary 120mm fans but smaller than the frame the impeller is sunken into. The impeller is 111 millimeters and the rotor is 40 millimeters in diameter. The Triebwerk fan doesn’t have spokes. Instead, it has a 2mm wire which helps minimize the resistance to the air and the noise from it.
The fan’s seven blades have the largest angle of attack among all the fans in this review.
“Thick” fans generally feature higher static pressure than ordinary 25mm fans and the Triebwerk puts a special emphasis on that. Having a specified rotation speed of 1200 RPM, the Triebwerk TK-121 is declared to have a static pressure of 1.62 millimeters of water, which is 28% higher than that of the similar Noiseblocker NB-BlackSilent PRO PL-2 at 1400 RPM (1.269 millimeters of water). Why do I call them similar? Because the Triebwerk features the same high-quality, noiseless and durable NB-NanoSLI bearings. The only difference is that the bearing’s service life is specified to be shorter, 100,000 hours, yet that’s good enough, too. This model is expected to produce an air flow of 61.6 CFM at no more than 21 dBA of noise.
The Triebwerk TK-121 also features a high-quality electromotor capable of working at voltages from 5.5 to 13.2 volts, consuming no more than 1.56 watts.
My measurements agree with the specs: the start-up voltage was 4.1 volts and the peak power consumption was 1.41 watts. The fan comes with composite cables with a combined length of 630 millimeters. This should be more than enough even for the biggest system cases.
The Triebwerk solves the problem of vibrations in a simple way. Instead of silicone pins or anything, there are soft pieces in the corners of the fan through which the fan contacts with a chassis or heatsink or anything you install it on.
The following diagram shows the test results of the Triebwerk TK-121:
The Triebwerk TK-121 produced a strong air flow, yet it is not as strong as to justify its much higher price compared to the other fans. It is not superior to the other tested fans in terms of noisiness, either. On the contrary, the Scythe Kama Flow 2 is just as good as the new-fangled Triebwerk TK-121 in terms of both noise and airflow. It is sad because we might expect this model to be a kind of technical revolution or at least unquestionably superior to the others. Hopefully, this fan has no rivals in terms of static pressure. This is indicated by the fact that the fan had almost the same speed in the tunnel as compared to the open testbed.