Balancing a 90mm EDF Fan (WeMoTec vs. ChangeSun 12 blade)

Simple balancing of two 90mm fans. I first use a quality German-made WeMoTec Midi Pro 90mm rotor as a reference, to test the quality of the balancers.

The second CS 12-bl fan was previously balanced in the usual way by using thin small strips of red electrical tape, applied to the inside of the hub.

My test first uses an 8-yr old home-made balancer with a true $3 (Prather or Thunder Tiger, from Tower Hobbies) finger prop balancer steel shaft, and later the new HK "Extreme accuracy Prop/Rotor balancer" SK-2050.

The shaft on the latter does not seem the straightest, nevertheless the balancer seems to work ok on these larger fans, not too bad for $16..

In the next version they should try to improve on the 3mm shaft and make the whole thing a bit straighter.

Some more details here : http://www.rcgroups.com/forums/showthread.php?t=1521751&pp=100

Category:

Science & Technology

Tags:

• ducted
• fan
• impeller
• edf
• balancing
• 90mm
• WeMoTec
• Change
• Sun
• changesun
• 12
• blade
• CS
• HK
• Hobbyking
• static
• statically
• dynamic
• dynamically
• principal
• moment
• of
• inertia
• tensor
• diagonalized
• SK-2050
• extreme
• accuracy
• Prop/Rotor
• balancer

[Tsavah]

What is making the background noise? You didn't say much, so folks new to the hobby might not understand what is going on, or what the video is about.

[Herbzqy]

@Tsavah ...the camera.

[Herbzqy]

Thanks ! Yes I used Hysol, but any quality slow cure epoxy with a thickening agent would work. The fan needs to be re-balanced after that.

[billyd44444]

Very nice!! So on the CS fan you used Hysol to glue all the blade in? I was thinking on doing the same thing! Let me know how it runs. Thanks Billy D