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Pushrods

 
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BobbyPaulk(at)comcast.net
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PostPosted: Wed May 19, 2010 5:14 pm    Post subject: Pushrods Reply with quote
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I am changing over to pushrods on the ailerons of my 601 during the upgrade. I am planning on using 1 1/8" O.D. x .039 6061 - T6 tubing in one piece. The overall length from center to center of the Heim bearings is 96".the same tube is used on several RV's. The RV-4 is ~ 66" Has anyone out there installed one piece pushrods and what size tubing was used. The above tube is plenty strong but I am concerned about vibration and harmonics on such a long tube. i would appreciate it if someone could e-mail a description or photos of their installation and how many hours they have flown.

Thanks for any help

Bobby
Florida
601 XL 96 hrs before upgrade.

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steerr(at)bellsouth.net
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PostPosted: Thu May 20, 2010 4:22 am    Post subject: Pushrods Reply with quote
Well, the harmonic frequency of a beam like this is inversely proportional to the length squared, so your harmonic frequencies will be about 47% of that of the pushrod in the RV-4, assuming you use the same size tubing. Let me know if you want to know the exact frequencies.

Bill


On 5/19/2010 9:11 PM, BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net) wrote: [quote] p { margin: 0; } List
I am changing over to pushrods on the ailerons of my 601 during the upgrade. I am planning on using 1 1/8" O.D. x .039 6061 - T6 tubing in one piece. The overall length from center to center of the Heim bearings is 96".the same tube is used on several RV's. The RV-4 is ~ 66" Has anyone out there installed one piece pushrods and what size tubing was used. The above tube is plenty strong but I am concerned about vibration and harmonics on such a long tube. i would appreciate it if someone could e-mail a description or photos of their installation and how many hours they have flown.

Thanks for any help

Quote:


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vk3eka(at)bigpond.net.au
Guest
PostPosted: Thu May 20, 2010 4:33 am    Post subject: Pushrods Reply with quote
Bobby,

I basically copied Bill Phillip’s documentation using the same Vans rod ends and 1 1/8” tubing.

I have now 8 hours on the plane and all is working well. I have flown a 601 with cables and haven’t noticed any great difference between the two.

You can download a copy of Bill’s documentation from here http://forums.matronics.com/download.php?id=14337&sid=5070ea75d7ac33d8a0d772db8f98561b

I left the balance cable in situ to provide some equalising forces on the aileron bell crank. Might be a bit of an overkill. I have it tensioned to 30lbs (Zenith spec) but may be a bit much. I think if I decreased it a little the aileron feel would be a little lighter.

Cheers

Peter
Wonthaggi Australia
http://zodiac.cpc-world.com




From: owner-zenith601-list-server(at)matronics.com [mailto:owner-zenith601-list-server(at)matronics.com] On Behalf Of BobbyPaulk(at)comcast.net
Sent: Thursday, 20 May 2010 11:12 AM
To: Zenith601-List(at)matronics.com
Subject: Pushrods



List
I am changing over to pushrods on the ailerons of my 601 during the upgrade. I am planning on using 1 1/8" O.D. x .039 6061 - T6 tubing in one piece. The overall length from center to center of the Heim bearings is 96".the same tube is used on several RV's. The RV-4 is ~ 66" Has anyone out there installed one piece pushrods and what size tubing was used. The above tube is plenty strong but I am concerned about vibration and harmonics on such a long tube. i would appreciate it if someone could e-mail a description or photos of their installation and how many hours they have flown.

Thanks for any help

Bobby
Florida
601 XL 96 hrs before upgrade.
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