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Lightening holes on rear ribs of 601XL

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davidhwright(at)mac.com
Guest

Posted: Fri Apr 06, 2007 4:32 pm Post subject: Lightening holes on rear ribs of 601XL

Gents



I am scratchbuilding a 601 and am neck and neck with Dave Clay and  

Ron Lendon - however....

While putting together the parts for the right wing I noticed that I  

had made an error in measuring the location for the lightening holes  

for the rear ribs.  I used the reference line on 6-W-6 top drawing to  

measure the position of the lightening holes.  I measured the 120mm  

for the first hole from half way up the form block instead of the  

bottom corner (as is clearly shown in the drawing left side of middle  

row!)

In consequence I now have 18 ribs, 9 of them rivetted into the right  

wing - all with the lightening holes 30mm forward of where they  

should be.

I noticed this error when fitting the aileron bellcrank assembly.

A possible problem I foresee is running the cables to the bellcrank -  

can anyone put me out of my misery - will the 30mm cause a problem  

running the aileron cables from the fuselage through the lightening  

holes - will there still be enough clearance??

I e-mailed Caleb at ZAC, but he was unable to assist as they don't  

have any open wings at Mexico.  He suggested utilising fairleads if  

there was a problem.

Dave Wright

601XL - scratchbuilding wings

Washington UK

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Ron Lendon

Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI

Posted: Fri Apr 06, 2007 5:10 pm Post subject: Re: Lightening holes on rear ribs of 601XL

Dave,  Take some string and run it from the bell crank back to where the cables enter the fuselage. this should give you a good visual.  Maybe you can modify where the other end connects to the stick to compensate?

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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/

larry(at)macsmachine.com
Guest

Posted: Fri Apr 06, 2007 5:12 pm Post subject: Lightening holes on rear ribs of 601XL

David,

Jig up your bellcrank and find the swing of the expected arc possible 

with max movements

using string if necessary.  All the dimensions are there if you stack 

them and you'll find out

how much the 30mm error means to the clearance you need.  It may have no 

consequence

or you may find the necessity of making a few ribs again.   In any case, 

don't despair as

all of us find ourselves in the same basket from time to time.  It's 

good for the soul to make

a few parts more than once occasionally. 

Good luck,



Larry McFarland 601HDS at www.macsmachine.com



David Wright wrote:

 	  Quote: 	
		   

 Gents



 I am scratchbuilding a 601 and am neck and neck with Dave Clay and Ron 

 Lendon - however....

 While putting together the parts for the right wing I noticed that I 

 had made an error in measuring the location for the lightening holes 

 for the rear ribs.  I used the reference line on 6-W-6 top drawing to 

 measure the position of the lightening holes.  I measured the 120mm 

 for the first hole from half way up the form block instead of the 

 bottom corner (as is clearly shown in the drawing left side of middle 

 row!)

 In consequence I now have 18 ribs, 9 of them rivetted into the right 

 wing - all with the lightening holes 30mm forward of where they should 

 be.

 I noticed this error when fitting the aileron bellcrank assembly.

 A possible problem I foresee is running the cables to the bellcrank - 

 can anyone put me out of my misery - will the 30mm cause a problem 

 running the aileron cables from the fuselage through the lightening 

 holes - will there still be enough clearance??

 I e-mailed Caleb at ZAC, but he was unable to assist as they don't 

 have any open wings at Mexico.  He suggested utilising fairleads if 

 there was a problem.

 Dave Wright

 601XL - scratchbuilding wings

 Washington UK

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TxDave

Joined: 22 Jul 2006
Posts: 168
Location: Temple, TX

Posted: Fri Apr 06, 2007 10:28 pm Post subject: Re: Lightening holes on rear ribs of 601XL

Dave,



Caleb, Ron, and Larry all have given you excellent advice. We surely are fortunate to have so many smart people to help us out. Seems like strategically placed fairleads would be appropriate. Of course your threaded rod will have to be 30mm longer since your bellcrank will be mounted 30mm forward. One thing to consider is how little the ailerons actually move from neutral ( 11.5 degrees up and down).



Dave Clay

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davidhwright(at)mac.com
Guest

Posted: Fri Apr 06, 2007 11:47 pm Post subject: Lightening holes on rear ribs of 601XL

Dave



That was a question I meant to ask, the threaded steel rod I have (6- 

W-10-5) is 230mm long.

What was the length of your threaded rod when you fitted it - I am  

hoping you are going to say you trimmed it down to less than 220mm!!

Dave

61Xl Scratchbuild wings

Washington UK



On 7 Apr 2007, at 07:28, TxDave wrote:



 	  Quote: 	
		   



 Dave,



 Caleb, Ron, and Larry all have given you excellent advice. We  

 surely are fortunate to have so many smart people to help us out.  

 Seems like strategically placed fairleads would be appropriate. Of  

 course your threaded rod will have to be 30mm longer since your  

 bellcrank will be mounted 30mm forward. One thing to consider is  

 how little the ailerons actually move from neutral ( 11.5 degrees  

 up and down).



 Dave Clay





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=105413#105413

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davidhwright(at)mac.com
Guest

Posted: Sat Apr 07, 2007 12:08 am Post subject: Lightening holes on rear ribs of 601XL

Larry / Ron



Thanks for the suggestions

I will try with the string - My problem was that I have not started  

the fuselage and I could not visualise where the cables would exit  

the fuselage and enter the wing and at what angle the cables would  

run.  I will trawl through my plans and see if I can find this info.

As far as remaking parts (and remaking remade parts) - I don't know  

about the soul - but it is good for Aircraft Spruce and other  

aluminium suppliers!

I wish it was only occasionally I remade parts - but I find that is  

the challenge of scratchbuilding as I progress I find that I am  

getting better at it and more able to read and understand the plans.   

I look back at some of my earlier work - rear wing ribs included, and  

know I could have done a better job.



Dave

601XL

Washington UK



On 7 Apr 2007, at 02:11, LarryMcFarland wrote:



 	  Quote: 	
		   

 <larry(at)macsmachine.com>



 David,

 Jig up your bellcrank and find the swing of the expected arc  

 possible with max movements

 using string if necessary.  All the dimensions are there if you  

 stack them and you'll find out

 how much the 30mm error means to the clearance you need.  It may  

 have no consequence

 or you may find the necessity of making a few ribs again.   In any  

 case, don't despair as

 all of us find ourselves in the same basket from time to time.   

 It's good for the soul to make

 a few parts more than once occasionally. Good luck,



 Larry McFarland 601HDS at www.macsmachine.com



 David Wright wrote:

> 

> <davidhwright(at)mac.com>

> Gents

>

> I am scratchbuilding a 601 and am neck and neck with Dave Clay and  

> Ron Lendon - however....

> While putting together the parts for the right wing I noticed that  

> I had made an error in measuring the location for the lightening  

> holes for the rear ribs.  I used the reference line on 6-W-6 top  

> drawing to measure the position of the lightening holes.  I  

> measured the 120mm for the first hole from half way up the form  

> block instead of the bottom corner (as is clearly shown in the  

> drawing left side of middle row!)

> In consequence I now have 18 ribs, 9 of them rivetted into the  

> right wing - all with the lightening holes 30mm forward of where  

> they should be.

> I noticed this error when fitting the aileron bellcrank assembly.

> A possible problem I foresee is running the cables to the  

> bellcrank - can anyone put me out of my misery - will the 30mm  

> cause a problem running the aileron cables from the fuselage  

> through the lightening holes - will there still be enough clearance??

> I e-mailed Caleb at ZAC, but he was unable to assist as they don't  

> have any open wings at Mexico.  He suggested utilising fairleads  

> if there was a problem.

> Dave Wright

> 601XL - scratchbuilding wings

> Washington UK

>

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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