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Vibrating control

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Jacquescj6

Joined: 20 Dec 2011
Posts: 23
Location: Swakopmund , Namibia

Posted: Tue May 06, 2014 1:31 pm Post subject: Vibrating control

Hi All

I have just replaced an engine and prop in my cj6 and now have a bit of a vibration.



On low Rpm it feels normal but at about 1200rpm there is a bit of vibration

on the aircraft taxing at higher rpm about 1400 rpm it seem to go away.



while flying there is a definite vibration on the stick.

At low rpm 1700 to 1900 the vibration its not to bad and I would describe it as a slow vibration but as you increase the rpm the vibration speeds up quite a bit shaking the stick . It does not feel as if the air frame is shaking abnormally but only on the stick.



Does anybody have a suggestion  as to what it could be or is it just an unbalance prop.

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richard.goode(at)russiana
Guest

Posted: Tue May 06, 2014 11:49 pm Post subject: Vibrating control

The obvious question is whether you have dynamically balanced the propeller

after changing it. We regard this as absolutely vital to smooth operation.



Richard Goode Aerobatics

Rhodds Farm

Lyonshall

Hereford

HR5 3LW



Tel:  +44 (0) 1544 340120

Fax: +44 (0) 1544 340129

www.russianaeros.com



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wlannon(at)shaw.ca
Guest

Posted: Wed May 07, 2014 7:29 am Post subject: Vibrating control

A few questions on your prop installation;



Was this a new prop. in 2 steel boxes from China.   If so it would be 

perfectly balanced assuming you have set the blade angles correctly - with a 

propellor  protractor,  and properly positioned and torqued the clamps.

While I agree with Richard about dynamic balancing that is a final step to 

match a properly balanced propellor with the rotating mass of the engine. 

Correct installation comes first.



Please advise the details of the prop and engine you installed.



Walt



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Jacquescj6

Joined: 20 Dec 2011
Posts: 23
Location: Swakopmund , Namibia

Posted: Wed May 07, 2014 11:56 am Post subject: Re: Vibrating control

Hi

Thanks for the reply's.

It was used blades I got from the guy I bought the plane from After installing the blades we did discovered that the no 1 blade was a bit longer than the no 2 blade?



I have taken them off and send them to our local propeller shop to do a static balance and then we will do a dynamic balance and see if it is better.



Will let you guys know.

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wlannon(at)shaw.ca
Guest

Posted: Wed May 07, 2014 6:17 pm Post subject: Vibrating control

You will need to send them the hub also.   They will have to match the two 

blades in length, width and thickness before installing in the hub for both 

horizontal and vertical static balance.

Unbalance correction is made with steel plates attached to the hub assy.

After that it should be good assuming the blade angles are set within 

tolerance which is 0.1 deg (6 min.).  I try to set them within 0.05 deg. (3 

min.)



Dynamic balance may not work very well on this prop. as there is no spinner 

structure.   For dynamic balance the corrective weight could be required 

anywhere within 360 degs.  With no spinner plate to accommodate that you are 

restricted to a limited area at each blade only.



Walt



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Jacquescj6

Joined: 20 Dec 2011
Posts: 23
Location: Swakopmund , Namibia

Posted: Fri May 09, 2014 12:26 pm Post subject: Re: Vibrating control

Hi

Update on the prop.

According to the prop shop the one blade is quite a bit heavier than the other one.

If any one has got some type of diagram on how to add weight in the blades

I would appreciate it

Thanks

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Jacquescj6

Joined: 20 Dec 2011
Posts: 23
Location: Swakopmund , Namibia

Posted: Sat May 24, 2014 12:06 pm Post subject: Re: Vibrating control

Hi All

Just an update on the vibrations.

The propshop did a static balance  and wala the vibration is now gone.

Thanks for all the help guys.

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