Today's Message Index:
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0. 10:16 AM - PLEASE READ - Matronics Email List 2016 Fund Raiser During November! (Matt Dralle)
1. 01:29 AM - Re: door hinge screw query (John Wighton)
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Subject: | PLEASE READ - Matronics Email List 2016 Fund Raiser During |
November!
Dear Listers,
Each November I hold a PBS-like fund raiser to support the continued operation
and upgrade of the Email List and Fourm Services at Matronics. It's solely through
the Contributions of List members (you) that these Matronics Lists are possible.
You have probably noticed that there are no banner ads or pop-up windows on any of the Matronics Lists or related web sites such as the Forums site http://forums.matronics.com , Wiki site http://wiki.matronics.com , or other related pages such as the List Search Engine http://www.matronics.com/search , List Browse http://www.matronics.com/listbrowse , etc. This is because I believe in a List experience that is completely about the sport we all enjoy - namely Airplanes and not about annoying advertisements.
During the month of November I will be sending out List messages every couple of
days reminding everyone that the Fund Raiser is underway. I ask for your patience
and understanding during the Fund Raiser and throughout these regular messages.
The Fund Raiser is only financial support mechanism I have to pay all
of the bills associated with running these lists. YOUR personal Contribution
counts!
This year we have a really HUGE and TERRIFIC line up of free gifts to go along
with the various Contribution levels. In fact, there are over 24 different gifts
to choose from! There's something for everyone, to be sure. Most all of
these gifts have been provided by some of the vary members and vendors that you'll
find on the Matronics Lists and they have been either donated or provided
at substantially discounted rates.
This year, these generous members include:
Andy Gold of the Builder's Bookstore http://www.buildersbooks.com
Bob Nuckolls of the AeroElectric Connection http://www.aeroelectric.com
Corbin Glowacki of My Pilot Store http://www.mypilotstore.com
George Race of Race Consulting http://www.mrrace.com/
Jon Croke of HomebuiltHELP http://www.homebuilthelp.com
These are very generous guys and I encourage you to visit their respective web
sites. Each one offers a unique and excellent aviation-related product line.
I would like publicly to thank Andy, Bob, Corbin, George, and Jon their generous
support of the Lists again this year!!
Please make your List Contribution using any one of three secure methods including
using a credit card, PayPal, or by personal check. All three methods afford
you the opportunity to select one of this year's free gifts with a qualifying
Contribution amount!!
To make your Contribution, please visit the secure web site:
http://www.matronics.com/contribution
I would like to thank everyone in advance for their generous financial AND moral
support over the years!
Thank you!
Matt Dralle
Matronics Email List Administrator
RV-4/RV-6/RV-8 Builder/Rebuilder/Pilot
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Subject: | Re: door hinge screw query |
Rowland,
The manual 35_CBM - 35 FITTING DOORS from the Europa website, Fig 5 shows the intended
design condition of the door hinge installation. The screws into the
upper hinge leaf are shown countersunk with a knife-edge condition (poor practice
#1), the figure is probably not to scale but there looks to be significant
material for the counter-bore, a washer and the nut. It shows an almost flush
screw (i.e. less than 1 complete thread as normally required) (poor practice
#2). I note the lower hinge leaf has a protruding head fasteners with integral
washer.(AN525-10R10) and a non counter-bored retaining nut (good practice #1).
The critical failure mode as drawn is a head-side pull through (due to tension
and prying) of the upper screw. For high time aircraft this may be surpassed by
a tensile failure initiated by a fatigue crack between the countersinks. Hence
l think you could increase the depth of the counter-bore slightly to ensure
one protruding screw thread and a flush OML (outer mould line). Minimise the
countersinking.
Looking at my own aircraft l found both sides countersunk. This enables a slight
over-parallel condition of the hinge leaves - to account for built tolerance
(in other words there is no room for the head of the AN525-10R10). This has
the slight benefit of ensuring both sides of the hinge flex a similar amount
- thereby reducing the likelihood of a fatigue crack on the more flexible side
(as drawn).
A redesign to today's interpretation of the regulations and compliance standards
would require adherence to best practice design principles. This would most
likely result in slightly thicker hinges, 130 deg countersinks with corresponding
shallow head fasteners, a third fastener on each hinge (offset centreline
to alleviate the prying action).
JW
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John Wighton
Europa XS trigear G-IPOD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=461787#461787
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