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HelicopterHIROBOHirobo SDX › Balancing the fan
01-02-2010 10:21 PM  7 years agoPost 1
Richardmid1

rrProfessor

Leeds, England

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Whats the best way to balance the fan? As it has no opposing hole for counter balancing the governor magnet im guessing it needs doing?

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01-02-2010 10:44 PM  7 years agoPost 2
Heli Wiz

rrApprentice

Moravia,N.Y. U.S.A.

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I have not balanced my fan in my SDX and it has no vibes, what so ever. It is rock solid in a hover and everything is very stable. I don't think it is a big enough issue to worry about. Just build everything like the manual says and fly it. You won't be disappointed at all! Hope this info helps you out.

Thank's Bill

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01-02-2010 11:12 PM  7 years agoPost 3
RayJayJohnsonJr

rrKey Veteran

Midwest

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Glue your magnet in. Then put the fan on a hi-point balancer. Carefully remove material from the back of the fan as needed until it's balanced.

-Mark

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01-02-2010 11:56 PM  7 years agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

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Agreed. The fan's balance should be checked and confirmed to be correct. Some fans are lucky enough to be heavy on the side opposite the magnet's. They'll run OK. Other's won't be that lucky. If it's not checked, you'll never know. I can also tell you for a fact that you can't see all vibration, but the components in the model DO and want last as long as they would were they installed in a confirmed, well-balanced model.

Dubro makes another blancer that works well. The most controlled way to remove material from the fan is with a 1/4' drill bit used to make small divots in the underside of the fan.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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01-03-2010 12:31 AM  7 years agoPost 5
John Benario

rrVeteran

Las Vegas

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If I remember correctly the fan threads on, which mean that you cannot use the High Point shaft on it since a threaded hole is not centered. However.....Steve Poretz came up with a work around. If you put two ball bearings of the appropriate size in the recess on top of the threaded hole the cone on the balancing shaft will center on the inner race of the ball bearing, which is a centered hole.

John Benario

Team highest quality
Futaba radios
Cool Power fuel
John's Ultimate building school

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01-03-2010 12:50 AM  7 years agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

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Cool.

Noted.

Ben

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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01-03-2010 02:24 AM  7 years agoPost 7
TMoore

rrMaster

Cookeville, TN

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Not so fast,

The fan hub is counterbored and chamfered on one side so the cone on the High Point fits against a bored surface. The tapped hole has a 45 degree chamfer that is machined prior to the tapping operation so in my mind this is a qualified surface. When I mount the hub on the High Point shaft the hub runs within .0005". IMHO, this is accurate enough for balancing.

TM

Delayed Response Operator Not Engaged

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01-03-2010 02:40 AM  7 years agoPost 8
Dr.Ben

rrMaster

Richmond, VA, USA

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Double extra good, Terry.

Thanks.

Ben

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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01-03-2010 03:15 PM  7 years agoPost 9
John Benario

rrVeteran

Las Vegas

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This is great, we all keep outdoing each other. Maybe if we keep it up we will solve all the world's problems!

I don't remember the chamfer on the SDX fan, but I wasn't looking for it. I guess i should have said, for most threaded fans: Thunder Tiger, Avant, etc. the threaded hole cannot be used for balancing because it is not centered. In these cases, use Steve's idea of inserting bearings.

John Benario

Team highest quality
Futaba radios
Cool Power fuel
John's Ultimate building school

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01-03-2010 09:37 PM  7 years agoPost 10
Richardmid1

rrProfessor

Leeds, England

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I will see what I can do. For now I tried some of that blue gel tape on the model then a metal plate then a some thin gyro pad then the gyro and strapped it down but not tightly with a velcro strap and the tail kick/wag almost totally went away.

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01-09-2010 09:10 PM  7 years agoPost 11
Richardmid1

rrProfessor

Leeds, England

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Ok, I had a go at balancing the fan with the one governor magnet, I simply drilled 3 2.8mm holes about 2mm deep in the plastic fan around the magnet to remove some weight that the magnet added. The result really suprised me, I now have a virtually vibration free heli at idle and the tail kick/wag has completely gone! The whole heli is smoother!

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01-09-2010 10:30 PM  7 years agoPost 12
Dr.Ben

rrMaster

Richmond, VA, USA

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Uh huh.

No sustitute for good building.

NOTHING.

Glad it's working well.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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01-11-2010 04:55 PM  7 years agoPost 13
B.T.D.T.

rrElite Veteran

NY

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For the Evo this is what I did.

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