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<DIV><FONT face=Arial>Generally, it's a time/distance/judgment thing. If
they had lost an engine on takeoff, and didn't return immediately to their point
of departure, an American crew would have been in deep trouble. A failure
some time after departure................... a different story..........
maybe.</FONT></DIV>
<DIV><FONT face=Arial>I was talking to a TWA 747 Captain years ago, and on a
trans-Atlantic flight, he had lost 2 engines, , one of which he had to shut down
because of low oil pressure. Then a third one started to go out on him; he
said he seriously gave thought to re-starting the one with low oil pressure,
which is virtually unheard of. Best one of all was a 747 that was inbound to HNL
when they lost all 4 engines, thus having their hands on one of the world's
largest gliders. The engineer, a fellow I happened to know, apparently
saved the day. But, as he said, it was a rather tense time for all.
(Well, he didn't quite put it THAT way!)</FONT></DIV>
<DIV><FONT face=Arial>Bill Glaze</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=khoard@gmail.com href="mailto:khoard@gmail.com">Keith Hoard</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 30, 2006 8:32
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] An
education in balsa usage for pattern</DIV>
<DIV><BR></DIV>
<DIV>.</DIV>
<DIV>.</DIV>
<DIV>.</DIV>
<DIV>That's called the "placebo effect"; a story Boeing made up just
to get pilots to fly their airplanes . . .</DIV>
<DIV>.</DIV>
<DIV>.</DIV>
<DIV>.</DIV>
<DIV>Just kidding!! They make great airplanes. . . British Airways B-747
lost an engine on the LAX - Heathrow flight soon after takeoff.
They continued the flight across the U.S. and Atlantic to complete the
flight. Great marks for the airplane and BA customer service - as for
judgement, I don't know. . . </DIV>
<DIV>.</DIV>
<DIV>.</DIV>
<DIV>.</DIV>
<DIV><BR> </DIV>
<DIV><SPAN class=gmail_quote>On 3/30/06, <B class=gmail_sendername>Bill
Glaze</B> <<A
href="mailto:billglaze@triad.rr.com">billglaze@triad.rr.com</A>>
wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<DIV style="DIRECTION: ltr">
<DIV><FONT face=Arial>In United's school, we were told, as an aside and a
pure point of interest, that after functional testing on the 747, the test
team was given the order "test to destruction" on the wing. It was
pulled upward until the tips were about 6' apart before there was a
"catastrophic failure."(!!) At least, that's what the school told
us. I was in 767 school at the time. </FONT></DIV></DIV>
<DIV style="DIRECTION: ltr"><SPAN class=sg>
<DIV><FONT face=Arial>Bill Glaze</FONT></DIV></SPAN></DIV>
<DIV style="DIRECTION: ltr">
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"></BLOCKQUOTE></DIV>
<DIV style="DIRECTION: ltr"><SPAN class=q>
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial"><B>From:</B> <A
title=rcmaster199@aol.com
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:rcmaster199@aol.com" target=_blank>rcmaster199@aol.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:nsrca-discussion@lists.nsrca.org"
target=_blank>nsrca-discussion@lists.nsrca.org </A></DIV></SPAN></DIV>
<DIV style="DIRECTION: ltr"><SPAN class=e id=q_10a4b14a63ae7a9e_4>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, March 29, 2006 10:00
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] An
education in balsa usage for pattern</DIV>
<DIV><BR> </DIV>
<DIV style="FONT-SIZE: 10pt">
<DIV>
<DIV>Wayne, </DIV>
<DIV> </DIV>
<DIV>Oh yeah babe, isn't that a kick? A 10 year old being introduced to the
fine art of balsa structure and mechanical engineering design.
Fabulous!!</DIV>
<DIV> </DIV>
<DIV>Give that teacher a bonus. </DIV>
<DIV> </DIV>
<DIV>Digressing a bit from the Balsa theme, Warren trusses, IF I
remember right, are basis for airliner spars among other
things. Several years ago, as a key supplier to Boeing, we had
opportunity to witness the triple 7 spar test where the wing was folded to
determine g-loading capability. Impressive test. </DIV>
<DIV> </DIV>
<DIV>Matt</DIV> <BR>-----Original Message-----<BR>From: Wayne Galligan
<<A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:wgalligan@goodsonacura.com"
target=_blank>wgalligan@goodsonacura.com</A> ><BR>To: NSRCA Mailing List
<<A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:nsrca-discussion@lists.nsrca.org"
target=_blank>nsrca-discussion@lists.nsrca.org</A>><BR>Sent: Wed, 29 Mar
2006 08:35:57 -0600 <BR>Subject: Re: [NSRCA-discussion] An education in
balsa usage for pattern<BR><BR>
<DIV>
<DIV><FONT face=Arial size=2>Matt,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>My son did his 5th grade science project using
balsa construction. His project was to determine what bridge truss
design held the most weight for a given span. It was truly amazing how
much weight the structure would hold. The spans he built
where 7"x7"x24" and weighted 1.5 oz, made of 1/4" square med grade
balsa glued together with thin c/a. The Warren truss held 42 lbs
before collapsing and the two other structures were close behind holding 32
to 38 lbs. It was a learning experience for both of us. It gave
me a better understanding of how certain truss structure builds stiffness,
strength and be light weight. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Wayne Galligan</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial"><B>From:</B> <A
title=rcmaster199@aol.com>rcmaster199@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org>nsrca-discussion@lists.nsrca.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, March 28, 2006 6:58
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] An
education in balsa usage for pattern</DIV>
<DIV><BR> </DIV>
<DIV style="FONT-SIZE: 10pt">
<DIV>
<DIV>Balsa is pretty amazing stuff overall, particularly for a natural
material. The Xylem that makes up much of the superstructure of any wood
(that's what we commonly hear as grain), is essentially a huge number
of tubes arrayed side by side, but interconnected along the length. The
tubes serve a terrific function in the long direction and the
interconnects make the structure have reasonable transverse strength as
well. </DIV>
<DIV> </DIV>
<DIV>The closest thing manmade that will surpass it in terms of mechanical
strength vs flex vs weight vs cost will likely be Buckytube if
you excluded the cost. That's just in laboratories now, being made in very
small quantities supporting very high end applications. This stuff is
the true unobtainium that some have complained about. But that's another
subject. </DIV>
<DIV> </DIV>
<DIV>There used to be an annual competition in colleges where a very
small, known quantity of balsa and glue were used creatively by students
to build some kind of support structure like a small bridge. These things
would hold unbelievable amounts of weight. </DIV>
<DIV> </DIV>
<DIV>Alas, the weakness is shock loading. </DIV>
<DIV> </DIV>
<DIV>Matt</DIV> <BR>-----Original Message-----<BR>From: Adam Glatt
<<A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:adam.g@sasktel.net"
target=_blank>adam.g@sasktel.net</A>><BR>To: NSRCA Mailing List < <A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:nsrca-discussion@lists.nsrca.org"
target=_blank>nsrca-discussion@lists.nsrca.org</A>><BR>Sent: Tue, 28
Mar 2006 16:44:02 -0600<BR>Subject: Re: [NSRCA-discussion] An education in
balsa usage for pattern <BR><BR>
<DIV><PRE><TT>Not directly applicable to pattern, but certainly a good start:
Buy and build a Stevens Aeromodel kit. The planes are small (35-50"
span, 1-2.5lbs) and electric powered. I'm about 1/2 done building the
Edge 540, and am actually enjoying the build because I am constantly in
awe of the genius wood design and its results (consider that this Edge
540 is 40-sized, but will weigh only 2lbs with more performance than all
but the most dedicated 40-sized 3D glow planes).
-Adam
White, Chris wrote:
>
> Can anyone tell me where a person can get a "Crash" course in learning
> about balsa weights and strength and its proper use in balsa pattern
> models.
>
> I notice a few years ago that in the 99 world champs most of the
> Japanese pilots models were balsa and light weight too. It seems that
> everything I read of late seems to indicate that light weight and
> strength only come with composite construction.
>
> Thanks..Chris
>
> ------------------------------------------------------------------------
>
> _______________________________________________
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</A><BR><BR></BLOCKQUOTE></DIV><BR><BR clear=all><BR>-- <BR><BR>Keith
Hoard<BR>Collierville, TN<BR><A
href="mailto:khoard@gmail.com">khoard@gmail.com</A><BR><BR>
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