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Noctua NF-R8 case fan
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Thursday, 16 July 2009 19:14
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Article Index
Noctua NF-R8 case fan
Features and specifications
Packaging
Closer look
Conclusion
All Pages

Noctua probably makes the most advanced case fans in the market, with unique features and specifications that outperform any other fan.NF-R8 fan is an 8cm fan, that has high performance and low noise combined with the high quality Noctua always offers.

 

 


 

 

Let's have a look at the features and specifications of NF-R8 fan.

 


Specifications

 

 

Technology

 


Noctua Raised-Blade-Design
Current silent fans frequently employ conventional blade geometries, which were developed for higher speed ranges and significantly lose efficiency at lower rotation speeds. The Noctua Raised-Blade-Design of the NF-R8 series was developed by the Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV) and specifically tailored to 80mm fans with extremely low rotation speeds. The result is a performance improvement of up to 10% compared to conventional blade geometries.

Both the angle of attack and the design of the blade area of the NF-R8 rotor are optimised for maximum airflow and minimum noise emission at speed ranges below 1800RPM. Raising the leading edge above the rotor hub and lowering the trailing edge below the bottom of the rotor hub results in an extended profile chord length, which compensates for the reduction in blade surface caused by the steeper angle of attack and hence increases the overall blade force. The continuous radial increase of the blade curvature towards the blade tips ensures sufficient static pressure despite of the slow rotation speeds. A significant reduction in noise emission is achieved through the rounding of the fan blades towards the rotor hub as well as the rounding of the rotor hub itself. This way, the NF-R8 is significantly more quiet than other high end silent fans at the same performance thanks to its specific optimisations for ultra low noise application.



Mag. Manfred Stadler MBA of the Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV) about the development of the Noctua Raised-Blade and Straight-Blade-Designs:

 


 

 

 



 

SSO-Bearing

 

Thanks to an optimised principle of operation, the self-stabilising oil-pressure bearing (SSO bearing) of the Noctua NF-S12 and NF-R8 series surpasses current types of ball, sleeve or liquid bearings in terms of long-term stability and quietness.

 

SSO principle of operation

 

The rotary motion of the axis generates pressure upon the special oil enclosed within the bearing. This causes the build-up of a dynamic pressure field that centres and stabilises the axis within the bearing shell. While conventional liquid bearings employ the principle of hydrodynamic pressure too, the SSO bearing is equipped with an additional magnet that supports the self-stabilisation of the rotor axis. This allows for a faster, more precise and more reliable centring of the rotor axis and thus increases the long-term stability and quietness of the bearing: When the fan starts, the dynamic pressure field of the liquid bearing needs to build up first, which results in an initial precession of the axis, the so called gyro effect. This amounts to an increased abrasion until the axis is stabilised through the build-up of the dynamic pressure field, which may by and by lead to increased noise emission and bearing defects. Because of this, the SSO bearing possesses a built in magnet, whose field ensures the immediate self-stabilisation of the rotor and hence reduces the gyro effect. In addition to the stabilisation during the start-up phase of the fan, the supporting magnet allows for a more exact centring of the axis within the bearing shell and thus further reduces bearing resistance, abrasion and noise emission.

Noctua - Bild

SSO compared to conventional sleeve and ball bearings

 


The sleeve and ball bearings currently predominating the fan market exhibit major drawbacks: While conventional sleeve bearings initially have very low noise emissions, they mostly possess unsatisfying long-term stability, which leads to a short overall lifespan and increasing noise after longer operating times. High grade ball bearings, on the other hand, while providing satisfying long-term stability operate at slightly higher noise levels from the beginning. The SSO bearing not only surpasses the quietness of conventional sleeve bearings but also the long-term stability of current top-of-the-line ball bearings.

Noctua - Bild

 

 

Now let's see the packaging...

 

 


Package is very nice, with a transparent window so we can see the fan.It also has the unique features on the top right corner

 

Noctua NF-R8 case fan

 

From the back we can see the features of NF-R8

Noctua NF-R8 case fan

 

 

The fan is in a clear plastic case, with all the accessories(molex adapter,4 silicone mounts,4 screws,2 resistors to reduce fan speed(LN-Low Noise and ULN-Ultra Low Noise connectors))

Noctua NF-R8 case fan

 

 

 

 


From the top we can see the 7 blades, that are slightly raised

Noctua NF-R8 case fan

 

 

From behind there is the product sticker

Noctua NF-R8 case fan

 

 


Noctua as always made a high quality products that exceeds even the highest expectations.NF-R8 fan is a fusion of high airflow and low noise that can satisfy virtually anyone especially at the 8cm range case fans where noise levels are much higher than 9 and 12cm and users demand lower noise while maintaining high airflow.

 

 

Their price is a bit high, but we always get what we pay for and NF-R8 worths every cent!

 

 

Positive

  • Innovation
  • High airflow
  • Low noise
  • Accessories
  • High quality

 

 

Negative

  • Not so eye-candy

 

 

 

 



Last Updated on Monday, 20 July 2009 20:52
 

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