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Cable load on rear rib 7

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dalemed

Joined: 25 Dec 2007
Posts: 46

Posted: Sat Nov 08, 2008 12:57 pm Post subject: Cable load on rear rib 7

I'm in the process of attaching the Bellcrank Support and Bellcrank Support Channel to Rear Rib 7.  I can't help but wonder how RR7 supports 70 (+/-10) lbs of cable force (each cable pulling with 30 (+/-5) lbs.).  



It's Saturday or I'd call the factory to ask them if it might be wise to add L angle doublers to the  Bellcrank Support Channel.



Am I unnecessarily concerned?

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Dale
Zenith Zodiac CH650

leo(at)zuehlfield.com
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Posted: Sat Nov 08, 2008 1:33 pm Post subject: Cable load on rear rib 7

dalemed wrote:

 	  Quote: 	
		   



 I'm in the process of attaching the Bellcrank Support and Bellcrank Support Channel to Rear Rib 7.  I can't help but wonder how RR7 supports 70 (+/-10) lbs of cable force (each cable pulling with 30 (+/-5) lbs.).  



   

I believe that is only 30 +/- 5 lbs pull on the rib.
	


 	  Quote: 	
		   It's Saturday or I'd call the factory to ask them if it might be wise to add L angle doublers to the  Bellcrank Support Channel.



 Am I unnecessarily concerned?



 --------

 Dale

 Flying Cessna 170B

 Building Zenith 601XL

   

Leo Gates
	




N601Z - CH601HDS TDO

Rotax 912UL

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Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Sat Nov 08, 2008 1:58 pm Post subject: Re: Cable load on rear rib 7

I don't think it would create a combined load like that because the other end is also dealing with half of the tension. It is just 30 (+/-5) lbs.  



 	  dalemed wrote: 	
		  I'm in the process of attaching the Bellcrank Support and Bellcrank Support Channel to Rear Rib 7.  I can't help but wonder how RR7 supports 70 (+/-10) lbs of cable force (each cable pulling with 30 (+/-5) lbs.).  



It's Saturday or I'd call the factory to ask them if it might be wise to add L angle doublers to the  Bellcrank Support Channel.



Am I unnecessarily concerned?

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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

pavel569

Joined: 21 Dec 2007
Posts: 77

Posted: Sun Nov 09, 2008 5:26 am Post subject: Re: Cable load on rear rib 7

It seems that very soon we will be questioning every single rivet on the plane that is flying in numbers for years already. Keep building according to plans and we'll be fine, IMHO.



Before I riveted the rudder together, I just wondered how this sheet of zerozeronothing aluminum can turn the plane. Try to bend your rudder after its done 

 	  dalemed wrote: 	
		  I'm in the process of attaching the Bellcrank Support and Bellcrank Support Channel to Rear Rib 7.  I can't help but wonder how RR7 supports 70 (+/-10) lbs of cable force (each cable pulling with 30 (+/-5) lbs.).  



It's Saturday or I'd call the factory to ask them if it might be wise to add L angle doublers to the  Bellcrank Support Channel.



Am I unnecessarily concerned?

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Pavel
CA
Zodiac 601XL
Stratus Subaru EA-81
Tail, flaps, ailerons, wings, fuselage, canopy done ...
"do not archive"

bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Sun Nov 09, 2008 11:17 am Post subject: Cable load on rear rib 7

Yes, you are being unnecessarily concerned. It may look flimsy with just the skeleton laying there in your workbench but you'll be amazed how much more solid everything gets after the skins get riveted on. I've never heard of any problems in that area and the fleet has accumulated thousands of hours. Build it to plans and fight the urge to add structure and weight where none is needed. You would also be amazed at how quickly those little modifications can add excess weight to the final assembly.



dalemed wrote:

 	  Quote: 	
		  I'm in the process of attaching the Bellcrank Support and Bellcrank Support Channel to Rear Rib 7.  I can't help but wonder how RR7 supports 70 (+/-10) lbs of cable force (each cable pulling with 30 (+/-5) lbs.).  



It's Saturday or I'd call the factory to ask them if it might be wise to add L angle doublers to the  Bellcrank Support Channel.



Am I unnecessarily concerned?

	




 -- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

do not archive.



 



 [quote][b]

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--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

dalemed

Joined: 25 Dec 2007
Posts: 46

Posted: Sun Nov 09, 2008 12:35 pm Post subject: Re: Cable load on rear rib 7

I obviously have a problem with addition - 30+30=60, not 70 lbs.  However, I think the rib really does see 60 lbs of force (30 lbs each cable).



Thanks to everyone who's reminded me that a lot of planes have flown for a lot of hours with this design without problems.  I'll just go back to building

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Dale
Zenith Zodiac CH650

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