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ggower_99(at)yahoo.com
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 Posted: Fri Jan 02, 2009 12:47 am Post subject: NTSB report. |
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I am still building my 601 XL , now finishing the Fuselage, will start the wings soon...
I will like to hear some good answers about simple questions:
What will be more dangerous? To over tight the cables? Or to have the cables just a little loose (in the lower side of the tension specs)?
Just wondering before I need a cable tension meter 
Saludos
Gary Gower
Flying from Chapala, Mexico
701 912S 230 hrs...
601XL Jab 3300 Tail done, fuselage almost ready, wings next.
--- On Thu, 1/1/09, David X <dxj(at)comcast.net> wrote:
| Quote: | From: David X <dxj(at)comcast.net>
Subject: Re: NTSB report
To: zenith601-list(at)matronics.com
Date: Thursday, January 1, 2009, 6:35 PM
| Quote: | --> Zenith601-List message posted by: "David X"
<dxj(at)comcast.net>
Take me off the list ... I already have a cable tension meter and a gaggle of
other tools needed to properly maintain an aircraft. Their costs were minimal
compared to the cost of the aircraft.
Perhaps you have an altimeter, airspeed indicator, compass and set of engine
gauges too. Those cost more than a cable tension meter. You should start a list
to share those.
careywf(at)sbcglobal.net wrote:
| Quote: | You're on the list Dave. Walt.
|
--------
Zodiac 601 XL - CZAW Built - Rotax 912S
DO NOT ARCHIVE
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 22257#222257
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jaybannist(at)cs.com
Guest
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| Posted: Fri Jan 02, 2009 4:20 am Post subject: NTSB report. |
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Gary,
I think over-tightening the aileron cables is dangerous, especially in cold weather. When it gets warm, the wings will expand more than the cables, effectively tightening them more. Too much tension on the cables can damage the aileron bellcrank support structures.
I re-set mine during cold weather at the bottom end of the recommended range. I will check them again in the Spring, when it begins to warm up, to see what effect ambient temperature change has on the cable tension.
I know that temperature will effect cable tension. I wonder if the wings flex enough during flight to effect tension.
Jay in Dallas
Do not archive
--
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larry(at)macsmachine.com
Guest
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| Posted: Fri Jan 02, 2009 7:56 am Post subject: NTSB report. |
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Hi Gary,
Over-tight cables will result in worn pivot bearings and perhaps bent
wing rib supports for the bell cranks. Loose is not good either, but
the spec tends to carry tightness to a maximum which is as bad as over
tight. 25 to 30 lbs is tight for any cable, unless it is of considerable
length and is unsupported along its length. It is the unrestrained
weight of a cable that is considered a "player" in the flutter
discussions and
that's any cable with low enough tension to swing freely between its
ends. In most cases, you cannot get that with 25 to 30 lbs.
Easy enough to feel the difference if you think about it. A tension
gage might be more useful to avoid over tightening as loose is easy
to diagnose.
Larry McFarland 601HDS at www.macsmachine.com
Gary Gower wrote:
| Quote: | I am still building my 601 XL , now finishing the Fuselage, will
start the wings soon...
I will like to hear some good answers about simple questions:
What will be more dangerous? To over tight the cables? Or to have
the cables just a little loose (in the lower side of the tension
specs)?
Just wondering before I need a cable tension meter
Saludos
Gary Gower
Flying from Chapala, Mexico
701 912S 230 hrs...
601XL Jab 3300 Tail done, fuselage almost ready, wings next.
|
| | - The Matronics Zenith601-List Email Forum - | | | 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:
http://www.matronics.com/Navigator?Zenith601-List |
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sdthatcher
Joined: 13 Mar 2008
Posts: 91
Location: Port Saint Lucie
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| Posted: Sat Jan 03, 2009 7:25 am Post subject: Re: NTSB report. |
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Although I certainly feel cables should be tight (within reason), especially in light of having my cables loosen during a 600 mile flight last October, a loose cable is less likely to vibrate than a tight one (cable frequency decreases as cable tension decreases). A completely slack cable will generally never see any induced vibrations (it's natural frequency is below any rotating equipment). However, the loose cable may result in a potential flutter of the ailerons which is less likely with a tight cable. It may have been my imagination, but while flying over the mountains of NC last October with extremely loose cables at a speed of about 100 mph, I was sure I noticed some small vibrations in the ailerons. What alerted me to the looseness of the cables in flight was the fact that I could move the stick about 1/2 inch either side of center without any force being exerted on the stick. When I landed in Andrews, NC and checked the cables, I noticed the balance cable was completely slack (it could be moved up and down about 6-8 inches). I won't get into why the cables became loose at this point since Ihab and I have discussed the geometry of the wing, cable displacement, initial tightness, rib bending, etc., etc., in order to determine the cause to no avail. If I discover a reason, I'll let everyone know. But in the meantime, just make sure your cables are tight, just not too tight.
| larry(at)macsmachine.com wrote: | Hi Gary,
...It is the unrestrained
weight of a cable that is considered a "player" in the flutter
discussions and
that's any cable with low enough tension to swing freely between its
ends. In most cases, you cannot get that with 25 to 30 lbs.
Easy enough to feel the difference if you think about it. A tension
gage might be more useful to avoid over tightening as loose is easy
to diagnose.
Larry McFarland 601HDS at www.macsmachine.com
Gary Gower wrote:
| Quote: | I am still building my 601 XL , now finishing the Fuselage, will
start the wings soon...
I will like to hear some good answers about simple questions:
What will be more dangerous? To over tight the cables? Or to have
the cables just a little loose (in the lower side of the tension
specs)?
Just wondering before I need a cable tension meter
Saludos
Gary Gower
Flying from Chapala, Mexico
701 912S 230 hrs...
601XL Jab 3300 Tail done, fuselage almost ready, wings next.
|
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| | - The Matronics Zenith601-List Email Forum - | | | 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:
http://www.matronics.com/Navigator?Zenith601-List |
|
_________________
Scott Thatcher, Port Saint Lucie, FL
601XL with Corvair, Registered as E-LSA
N601EL, EAA203 140 hours and not flying currently. |
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