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larry(at)macsmachine.com
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 Posted: Tue Nov 25, 2008 3:02 pm Post subject: [Probable Spam] Re: Re: Spreading fear about the XL |
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Hi Guys,
This week, I tensioned my cables as the last thing done for the annual
inspection and they were near 10 -15 lbs by the gage I made for the task.
While adjusting the turnbuckles, I increased the tension to 15 rudder,
20 elevator and 25 for the ailerons. I believe you confuse stretching
with pulling
the cable taut or perfectly straight, which will not happen unless you
reach some ungodly tension that breaks things. At 25 lbs, the cables for my
ailerons is still able to move and do not act like a guitar string.
Anything past 30 lbs the ribs will deflect to some degree and I would
worry about
the deflection turning into bending and excessive wear on the bell crank
bearings. I had to replace the bushings at the rudder this year after
125 hours.
Larry McFarland 601`HDS at www.macsmachine.com
japhillipsga(at)aol.com wrote:
[quote] Gig, the great probability is that other than when first set by the
AMD guy they never have been correct or even anywhere near correct. I
had a landing 2 years ago next March in a 20 knot + crosswind landing
that ballooned up even with full aileron pitch down on the wing and to
save it I fought the stick and bumped the throttle and got it down. I
know I stretched the cables then because I also bent some stuff I had
to replace. When I reattached the cables and reset the tension, but it
was without a meter. If you set the cables you will find that about
one turn of the turnbuckle is 10-15 pounds and I don't believe anybody
can tell much difference between 20 and 30 pounds by touch. Best
regards, Bill.
--
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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| Posted: Tue Nov 25, 2008 7:49 pm Post subject: Re: [Probable Spam] Re: Re: Spreading fear about the XL |
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Larry,
It was never my intention to intimate using the airframe to stretch the cables like guitar strings. I will fixture something on my work table when I get to that point. The cables will be pre-stretched before assembly.
Hope that clarifies things,
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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/ |
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Wed Nov 26, 2008 7:19 am Post subject: Re: [Probable Spam] Re: Re: Spreading fear about the XL |
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| Ron Lendon wrote: | Larry,
It was never my intention to intimate using the airframe to stretch the cables like guitar strings. I will fixture something on my work table when I get to that point. The cables will be pre-stretched before assembly.
Hope that clarifies things, |
That's the thing. I can't find anything, anywhere that says we either should or can pre-stretch these cables. If you have a specific place where this is shown please show specific cites.
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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| Posted: Wed Nov 26, 2008 6:55 pm Post subject: Re: [Probable Spam] Re: Re: Spreading fear about the XL |
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Gig,
I haven't found anything written either, but I will test the theory and report the results. My plan is to make up some cables, tension them above the requirements and see what happens when I apply a little more pressure, think plucking a guitar string, then check the tension again. If it doesn't change we will know then.
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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/ |
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Thu Nov 27, 2008 2:13 pm Post subject: Re: [Probable Spam] Re: Re: Spreading fear about the XL |
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| Ron Lendon wrote: | Gig,
I haven't found anything written either, but I will test the theory and report the results. My plan is to make up some cables, tension them above the requirements and see what happens when I apply a little more pressure, think plucking a guitar string, then check the tension again. If it doesn't change we will know then. |
Well get to work on that Ron. I'll be mounting wings shortly. 
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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