[NSRCA-discussion] An education in balsa usage for pattern

Thu Mar 30 04:32:55 AKST 2006

.
.
.
That's called the "placebo effect"; a story Boeing made up just to get
pilots to fly their airplanes . . .
.
.
.
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. . .
.
.
.

On 3/30/06, Bill Glaze <billglaze at triad.rr.com> wrote:
>
>  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.
>  Bill Glaze
>
>  ----- Original Message -----
> *From:* rcmaster199 at aol.com
> *To:* nsrca-discussion at lists.nsrca.org
>  *Sent:* Wednesday, March 29, 2006 10:00 PM
> *Subject:* Re: [NSRCA-discussion] An education in balsa usage for pattern
>
>
>  Wayne,
>
> 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!!
>
> Give that teacher a bonus.
>
> 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.
>
> Matt
>
> -----Original Message-----
> From: Wayne Galligan <wgalligan at goodsonacura.com>
> To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
> Sent: Wed, 29 Mar 2006 08:35:57 -0600
> Subject: Re: [NSRCA-discussion] An education in balsa usage for pattern
>
>  Matt,
>
> 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.
>
> Wayne Galligan
>
> ----- Original Message -----
> *From:* rcmaster199 at aol.com
> *To:* nsrca-discussion at lists.nsrca.org
> *Sent:* Tuesday, March 28, 2006 6:58 PM
> *Subject:* Re: [NSRCA-discussion] An education in balsa usage for pattern
>
>
>  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.
>
> 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.
>
> 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.
>
> Alas, the weakness is shock loading.
>
> Matt
>
> -----Original Message-----
> From: Adam Glatt <adam.g at sasktel.net>
> To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
> Sent: Tue, 28 Mar 2006 16:44:02 -0600
> Subject: Re: [NSRCA-discussion] An education in balsa usage for pattern
>
> 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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--

Keith Hoard
Collierville, TN
khoard at gmail.com
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