Balancing the fan?

[gkoutsis]

I am getting foaming inside my tank in an EVO 50.

I am thinking the fan/clutch is out of balance.
What is the best way to do it? Do I need to buy a balancer and if yes which one?

Thanks in advance
George

[DavidH]

There is a video in the video section of the forum by Shannon Davis. It shows a simple and economical way to balance a fan.

David

[gkoutsis]

The link to Augusto's site is not working....... :arggg: :arggg: :arggg:

[WayneBrown]

http://www.moretraction.com/helis

[DavidH]

http://www.moretraction.com/helis/setup%20videos.htm

Wayne already pointed you in the right direction. Here is a direct link to Shannon's setup videos.

David

[gkoutsis]

Cheers Wayne :noteworthy :noteworthy :noteworthy

[WayneBrown]

I figured He may want to see the others' too.. :dontknow

[gkoutsis]

And david! :glasses2:

[gkoutsis]

Do you know what he is using as a shaft?

Should I balance it with the clutch on?

[DavidH]

In that video he is using two start shaft cones off an XL 30. He is using a 5mm shaft for the cones to slip onto to hold the fan.
No balance the clutch separate from the fan unit.

Here is balancer that will work also.
http://www.ronlund.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=heli&Product_Code=DUB499

David

[gkoutsis]

Excellent David!

Looks like I have a few things to buy from Rick's....

Thanks a lot! :glasses2:

[Ivan]

The solid clutch shaft on the EVO is more problematic than the balance. Mind you, balance is important, but the start shaft has to be in perfect alignment to get it running smoothly.

I used my trusty travel indicator (dial indicator) to indicate the shaft to less than .001" runout. Here is the trick, since the shaft is solid, and uses three bearings (crank bearing, clutch bell bearing inside, and the one under the start coupler), it all needs to be lined up. Therefore I indicated the shaft near the clutch its self, and got it in tolerance by indicating in teh hub, then rotating the clutch on the hub to the place of least runout. then I checked the end of the clutch start shaft and used a landing gear skid off an old busted set to bend the shaft into tolerance. It doesn't take a lot, since we are dealing with thousandths of an inch. Then check the base tip and the middle of the start shaft again to make sure eevrything is in tolerance.

Once I did this to my EVO, the fuel doesn't foam, bolts are staying tight, adn I can carry it out to the flight line without my wrist going numb. For being an older OS 50, it is pretty darn smooth.