Discus CS grounded in France

In article ,
says...

Concrete and steel bonded together consitute a 'composite'
structure. Steel girders used for bridges have steel
studs welded on top flanges of the girders. The concrete
deck is poured and bonds to the girders with the help
of the numerous studs. The Portland cement in the
concrete is the glue which makes the bonding possible.
So, in a way, the concrete and the steel are 'glued'
to each other. Calculating the strength of the structure
takes the 'composite' structure into account.

I wouldn't call this a composite structure, because the materials are
basically separate with a definite interface (the studs). I do think
of concrete reinforced with iron bar and/or or iron grid as a
composite.

--
!Replace DECIMAL.POINT in my e-mail address with just a . to reply
directly

Eric Greenwell
Richland, WA (USA)

test

Chris OCallahan stated

'...quality control broke down at the Chechnia factory.
The question is 'For how long and to what degree?'
Two gliders from the same factory breaking up in flight
in a single season quality control broke down at the
Chechia factory. The quesiton on my mind is,
'For how long and to what degree?'

Two gliders from the same factory breaking up in flight
in a single season deserves a factory explanation.
'

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Dear Chris,

Maybe the WingGlueMan needs reassignment to
clean shop or answer telefunken;

or

a Beer On The Job rule of not more than 2 grossestein
biers every hour needs some clearminded consideration.




Dancing on clouds,

Keep it up!

Jim Culp USA
GatorCity Florida
Std Libelle H201b (still flyin)

In the recent post, there is a reference to a "Chechnia factory". For
clarity's sake, and nothing else, I think the writer meant the Czech Republic.
Correct me if I am wrong, I have been know to goof before.

Cheers, Charles

Charles:

I believe that most of the CS's were built by Orlican in Chocen, CZ.
Some of the later ones were built by Schempp-Hirth, Vyr.Let.S.R.

-Deputy Dog


(Vorsanger1) wrote in message ...
In the recent post, there is a reference to a "Chechnia factory". For
clarity's sake, and nothing else, I think the writer meant the Czech Republic.
Correct me if I am wrong, I have been know to goof before.

Cheers, Charles

There is a company using the Discus BM Wing for a very new design
called the Carat (Motor Glider). It is manufactured by a company in
Slovania called AMS Technoflug and uses a front enging with forward
folding propeller. I assume that they are manufacturing the (Discus
BM) wing design in Slovania. I understand that they are known for very
high quality work... they build many of the DG Gliders.





(Deputy Dog) wrote in message om...
Charles:

I believe that most of the CS's were built by Orlican in Chocen, CZ.
Some of the later ones were built by Schempp-Hirth, Vyr.Let.S.R.

-Deputy Dog


(Vorsanger1) wrote in message ...
In the recent post, there is a reference to a "Chechnia factory". For
clarity's sake, and nothing else, I think the writer meant the Czech Republic.
Correct me if I am wrong, I have been know to goof before.

Cheers, Charles

Schempp-Hirth, Vyr.Let (Vyroba Letadel means Airplane factory) is the
new name of Orlican

Cheers

Marc

Deputy Dog a écrit:
Charles:

I believe that most of the CS's were built by Orlican in Chocen, CZ.
Some of the later ones were built by Schempp-Hirth, Vyr.Let.S.R.

-Deputy Dog


(Vorsanger1) wrote in message ...

In the recent post, there is a reference to a "Chechnia factory". For
clarity's sake, and nothing else, I think the writer meant the Czech Republic.
Correct me if I am wrong, I have been know to goof before.

Cheers, Charles

Nope, my goof. Finger flutter.

This is a troubling report. I've read both the French and English
version of the grounding order: the English version is an accurate
translation. No mention of high time or turbulence. One finds
oneself drawn to the conclusion that some sort of construction defect
played a role. Tales of third party reports of insufficient resin are
troubling and certainly deserve a more complete explanation,
recognizing, of course, that liability is still being considered by
lawyers. And recognizing too that there is such a thing as too much
resin in composite aircraft construction: you don't just ladle on as
much epoxy as gravity will hold in place if you are trying to find the
best balance of strength and weight. But if a given factory is
producing parts that fail in flight this certainly calls for more than
hints of workmen drinking too much beer and inspectors abdicating
their responsibility. Let's get serious with this, shall we? Does
anyone have more than suspicions of beer drinking and third party
negligence?

Now I am confused, Eric wrote
In composite construction, there is no "glue": the resin permeates the
other material (glass, carbon, Kevlar, etc), and the material
properties depend on this. There are layers of the fiber, but they
aren't glued together like the wood layers in plywood.

How is the fiberglass layer bonded to the foam core, if it isn't *glued* with
the resin? I thought you were making the distinction between several layers of
fiberglass cloth, as in a fuselage and fiberglass cloth/ foam core/ fiberglass
cloth, as we find in the wing.
I thought you were saying that plywood wasn't a *composite*, because it didn't
have a core, so therefore couldn't be considered a composite, but now you are
saying that 3 layers of fiberglass is a composite, but 3 layers of wood isn't.

Some of the plywood we use in our sailplanes is made up of mahogany / poplar
core/ mahogany. Sounds like glass /foam core/ glass, with a change in
materials, doesn't it?


JJ Sinclair