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Woah. Blade Tip Driven Fan

you have to remember that very little output will come from the middle of the fan to begin with as the blades are moving at a much slower speed than at the edges.

jt
 


<< you have to remember that very little output will come from the middle of the fan to begin with as the blades are moving at a much slower speed than at the edges.

jt >>


That was my first thought as well.
 


<< you have to remember that very little output will come from the middle of the fan to begin with as the blades are moving at a much slower speed than at the edges.

jt >>



you could make the angle of the blades VERY steep near the inside though to get some benefit. and it would probably provide a more cylindrical airflow over the current fans which put out a cone-shaped flow
 
Anyone want to guess how much more these will be than a comparable standard fan?

I'm guessing retail 80mm fans will be about $20-$25
 
Interesting certainly, but there are definitely limitations to overcome.

First off, the magnetic field produced by the coils must act over a much greater distance. The strengh of a magnetic field is equal to the inverse of the distance squared. This translates into greatly reduced torque. Additionally, the blades must be ferro-magnetic...that means more weight. More weight and less torque explain the reduced rotational speed. Adjusting the angle of the blades will increase CFM, but will also increase drag thus lowering RPM even more. This might also increase fan noise. Since I've never seen one in action, I can only speculate here, but I'd like to see some reviews on its effectiveness before tossing my traditional fans into the junk-box.
 
ST4RCUTTER, about torque,did you even go read the
link?




<< POWER CONSUMPTION / TORQUE

Locating motor at 4 corners substantially expands the room for winding. Thus, lower power consumption can be easily attained. At the same time, the torque of motor becomes even much more powerful than ever. >>





 
imagine, once these come out, there will be about 80 reviews in the first two days. Then maybe we will see if they are worth it.
 
ST4RCUTTER, about torque,did you even go read the link?

Yes I did, but the percentages provided are not referenced to anything. Saying that it increases 30% of airflow and static pressure is not very helpful it you're comparing it to a small, low-RPM model. In my previous post I was only outlining some of the obstacles to overcome. I'm not saying this fan is going to be a failure, on the contrary it looks like a great idea. Having only ferro-magnetic tips puts them in much closer proximity to the magnetic field, and should improve overall torque without increasing overall impeller weight. Reducing the hub should also reduce friction between the the impeller and the mount. In the end though I need to see a review before casting my vote.
 
everything you said makes sense, until you look at their actual test on a pre-production model, which pumped out 5800rpms, and 40dba, and 37 or so CFM
 
Did I read that right? 40 dba? That is hella loud. 5,800 rpm i can live with, and 37 cfm too. But damn thats a little too noisy for me.
 
It's loud as hell until you 1/2 the voltage to it. Then you get some decent airflow (maybe 18 CMF) and near silence 🙂

good old baybuses
 
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