64mm shroud vibrating in a flat foamie - RC Groups
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May 05, 2011, 05:19 PM
Air Cooled VW mechanic
THX-181's Avatar

64mm shroud vibrating in a flat foamie

I have a TechOne SU-27 flat foamie with a 64mm edf.
The edf housing is only attached to the airframe at two points.
At a specific rpm the edf housing resonates badly and contacts the impeller.

I'm tempted to cut out a couple light ply ring segments to glue to housing.

Am I on the right path?

Is this a common issue?

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May 05, 2011, 07:21 PM
Registered User
JGuilty13's Avatar
Just sounds like your fan in unbalanced....pretty common especially if its a stock unit. A lot of my edfs will resonate at a certain RPM, but usually goes away when I exceed or decelerate.
May 05, 2011, 09:38 PM
Aka: Tom Jenkins
ApexAero's Avatar
Try and rotate the impeller a few degrees on the shaft at a time, recheck untill you hit the sweet spot
May 05, 2011, 09:57 PM
Indoor Free Flight Modeler
If you can remove the motor fan unit, I offer dynamic balancing services for a fee. It will run very smooth afterwards.

May 06, 2011, 02:30 AM
Air Cooled VW mechanic
THX-181's Avatar
Thanks for the advice.
I did balance the impeller.
In this case i can actually watch the the housing deflect inward towards the impeller at a specific RPM.
Any other ideas?
May 06, 2011, 06:46 AM
Registered User
D_FAST's Avatar
If it is your shroud defleting. Get ahold of some CF strands/tape/mesh and epoxy this around the shroud to beef it up.
Take a look at how guys use the CF tow strips to beef up the glassed intakes. same method same purpose.

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