Today's Message Index:
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1. 01:18 PM - Re: Brodhead dates (Mild Bill)
2. 02:39 PM - Re: Wing Strut Fittings on Spars (Mild Bill)
3. 02:47 PM - Re: Wing Strut Fittings on Spars (tools)
4. 07:11 PM - Re: Jury struts... (Andre Abreu)
5. 08:09 PM - Re: Re: Hangar door riff-raff (Dortch, Steven D MAJ MIL USA NGB)
6. 08:17 PM - Re: jury struts (Dortch, Steven D MAJ MIL USA NGB)
Message 1
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| Subject: | Re: Brodhead dates |
Here's a Hitler bunker scene: http://www.youtube.com/watch?v=tPvWQ2UmVRQ
Warning: This parody contains occasional profanity, so best to avoid if you think
you might be offended.
Poor Adolf, don'tcha know, is having a hard time getting his on-line orders for
pipe tobacco filled. For those not acquainted with the fine pastime of pipe smoking,
all but one of the pipe tobacco blends mentioned in the subtitles are
highly sought after. The exception is Mixture 79, a heavily scented blend that
is hated, loathed, despised, and reviled by most (though not all) pipe connoisseurs.
You'll appreciate the explanation when you encounter the references.
The scene was lifted from the movie "Downfall" which depicts the last few days in Hitler's bunker. One of the best war movies ever made. Check out the trailer here: http://www.youtube.com/watch?v=Bp1RXmM1-60
--------
Bill Frank
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=401437#401437
Message 2
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| Subject: | Re: Wing Strut Fittings on Spars |
tools wrote:
> The issue that comes into play is whether you can get the pin in from the top,
which is the general preference as it cannot fall out as easily.
>
> I have a few spots where it HAS to go in from the bottom for clearance reasons.
A little longer is better. For all flying purposes, these are in tension,
so the little longer cantilever isn't a big deal.
You've got me scratching my head in puzzlement here, tools. When the wings are
assembled to the lift struts, the pins that go through the fittings are aligned
essentially horizontally, so there doesn't seem to be an issue of getting the
pin in from the top or bottom.
However, apropos of pins or bolts going in from the top or bottom, it turned out
that on one occasion the nerd engineers knew what they were doing and the wise
old mechanic on the assembly line didn't. The latter just knew that the former
had made an obvious mistake on the drawings. Doesn't everybody know that bolts
are installed head up so they won't fall out if the nuts should happen to
work free? So he ignored the drawings and installed bots head up in the assembly
of aileron cylinders on the North American F-86 assembly line.
The result? A number of F-86 crashes due to locked up ailerons. Chuck Yeager made the discovery after a hair-raising, death-defying near crash: http://characterqualitystories.com/cqs/node/394
--------
Bill Frank
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=401439#401439
Message 3
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| Subject: | Re: Wing Strut Fittings on Spars |
Nope, you're right. Those pics didn't load for me when I first read it. On the
bottom is where you run into that issue, also on a few fittings on the tail
feathers.
There is much discussion on lengthening those fittings a bit for that reason.
In this case, there still is the issue of getting a wrench onto nuts, or room for
washers, etc, where it being a bit longer helps with assembly quite a bit.
Also for where you leave the holes a bit small, then ream everything to size
when you assemble, and there isn't enough room to allow the drill to run the reamer
correctly.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=401441#401441
Message 4
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| Subject: | Re: Jury struts... |
Tailwind doesn't use jury struts.=C2- I think they shove a piece of wood
through the center prevent buckling from the compressive loads.=0A=0AAndy A
breu=0A6186L=0AEAA 582=0A=0A=0A=0A=0A________________________________=0A Fr
om: G Hansen <ghans@cable-lynx.net>=0ATo: pietenpol-list@matronics.com =0AS
ent: Sunday, May 26, 2013 10:58 AM=0ASubject: Pietenpol-List: Jury struts..
.=0A =0A=0A=0AWhen I built my Piet many years back I used Aeronca Champion
front strut =0Amaterial for the front struts. The welded-in small bushing f
or the jury strut =0Aattachment wound up a few inches outboard of center as
a matter of course, and =0Athis was not considered a problem. Salvaged rea
r Taylorcraft struts became my =0Arear struts and small bushings were welde
d in to match those on the front =0Astruts. I had always intended to use ju
ry struts because I had flown a friend=99s =0APiet that didn=99
t have them. His struts seemed to have a definite harmonic =0Avibration rel
ated to engine rpm (the propeller was not out of balance or track) =0Aand,
from an engineering standpoint, jury struts dramatically increase the =0Are
sistance to buckling in compression. The positioning of my jury struts off
=0Acenter was a happy coincidence in that it established different harmonic
modes =0Aover the strut length. This was not realised at the time, but som
etimes good =0Athings just happen.=0A=C2-=0ARegardless of what some may s
ay, it is prudent to use jury struts on a high =0Awing airplane, unless the
lift struts are of relatively =9Cfat=9D cross section =0A(i.e.
Luscombe (metal wing), Cessnas, etc.). Most high wing light planes over
=0Athe years have them because the lift struts are relatively slim thin-wal
l =0Astreamline tubing, susceptible to buckling under compression loads (ne
gative g =0Ain flight or heavy snow loads, etc.).=0A=C2-=0ACheers,=0A=C2
-=0AGraham Hansen=C2- (Pietenpol CF-AUN in Alberta, Canada)=0A=C2-=0A
=================
Message 5
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| Subject: | Re: Hangar door riff-raff |
UNCLASSIFIED
I think! Therefor I am!
I think.
On 05/23/13, jarheadpilot82 wrote:
>
> When I was in the Training Department at my current employer we put it this way-
>
> 1. Them that can, do.
> 2. Them that can't do, teach.
> 3. Them that can't teach, evaluate.
> 4. Them that can't evaluate, administrate.
>
> --------
> Semper Fi,
>
> Terry Hand
> Athens, GA
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=401255#401255
>
>
>
>
>
>
>
UNCLASSIFIED
Message 6
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UNCLASSIFIED
Gee, it seems that slightly more than half of the Pieters think the strut is a
good Idea ;-} (OK so far everyone). Guess, I will keep them.
Thanks all for the great input. And thanks Douwe for summarizing it.
Blue Skies,
Steve D
On 05/24/13, Douwe Blumberg wrote:
>
>
>
>
> I only get the list every morning, so the “jury strut” answer has
already been put out here, but I feel so strongly about it I want to chime in
too.
>
>
>
> As mentioned…
>
>
>
> This is all discussed in the archives
> The jury strut supports the strut, not the wing
> The jury strut supports the strut in negative G’s only
> The wing experiences surprisingly strong G’s ALL THE TIME in even moderate
turbulence (afternoon flights) and landings
> In such a cluttered airframe as a Piet, the “drag” of four jury struts
is probably un-measurable
> The old strut tubing Bernhard used DID have internal webbing, ours does NOT.
> There is a substantiated old case of a guy trying to loop a Piet, (idiot) he
let some negative G’s creep in and the wings folded up.
> Jury struts should not be placed in the center of the strut, but offset towards
the wingtip.
>
>
>
>
> In conclusion. DON’T EVEN THINK ABOUT NOT PUTTING JURY STRUTS ON.
>
>
>
> Douwe
>
>
UNCLASSIFIED
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