زس1

۹ بازديد
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
133Why You Shouldn’t Buy My Business Book
labeled as a “Pastor Appreciation Dinner,” and Sully was
to be part of the entertainment. I thought perhaps it was
a kind of payback for all those pagans who decided to
invite the Christians to the Coliseum to entertain them.
So naturally, I tagged along.
We rode to the event together in the pastoral
minivan, and on the way, we discussed what jokes were
and were not appropriate. Most of Sully’s material landed
firmly in the “not appropriate” category, but in the end,
he assured us that he could sterilize a list that would pass
Jerry Falwell’s all-points inspection.
And surprisingly, it worked.
For the first fifteen seconds of Sully’s act, not a
single sketchy reference slipped through. Then all hell
broke loose. As I looked up at the stage I could see him
perspiring heavily as he looked out on a room that was
practically brimming with non-alcoholic beverages. I
could read his mind: Why did I say yes to this?
Then somewhere amid the nervousness, in this room
of very conservative preachers and their wives, a word
slipped out. And then another. It was happening in slow
motion. And as it happened, I could hear the air being
sucked out of the room. This was going to end badly! I
started preparing to warm up the pastoral minivan.
Unfortunately, it wasn’t over.
Further into his routine, Sully got more nervous
and a couple more words slipped out, along with some
jokes that were hardly clean by Christian standards.
People weren’t laughing now. Not even a little bit. And
Sully didn’t look so good. After all, these were his tame
jokes! They always worked. They always got laughs! But
 
 
134 CHURCH
not tonight. And at some point, toward the end, it was
as if he said “forget it—I’m going with my usual routine!”
They cut his mic.
Afterward, most folks were surprisingly polite. One
lady even tried to pay Sully a compliment by telling him
that when she was an “unbeliever” she would never
have had the courage to come to an event like this. Sully
didn’t think of himself as an unbeliever. He believed in
lots of things, just not basic Christian doctrines. He was
offended, and he asked about it later: “What the [bleep]
is an unbeliever?!”
Later, as Brianna and I drove home, we alternated
between fits of nervous laughter and feelings of embar-
rassment. I hate watching people bomb. Because I’ve
bombed. And it stinks. Then as I lay awake in bed, I
thought strangely about something that happened at
Pentecost with the fiery tongues.
The Scriptures say that when Jesus’ Breath blew into
the lives of his followers, a crowd of people gathered to
see what had happened. And it wasn’t just a crowd of
locals. They were Jews from various different countries
and languages, all gathered for the feast. Yet they had
come together now because they had heard the disciples
speaking to them in their own language (see Acts 2:6).
The Bible calls this cross-cultural communication
“speaking in tongues,” but I imagine it was something
different from the apparently self-induced hysterics of
some Christian cable shows. In Acts 2, these tongues
appear to be real (human) languages with real words.
They were native languages that made sense to the
people gathered from their far-flung lands. They made
 
 
135Why You Shouldn’t Buy My Business Book
so much sense, in fact, that the people wondered how a
bunch of backwater-types from Galilee could communi-
cate the Jesus-story so clearly. It was a miracle, and after
my night at the R-rated pastor’s dinner, it seemed like an
even bigger one.3
Why I Want to Speak in Tongues
For many of us, it isn’t long after being converted that
we lose much of our ability to communicate the Jesus-
story to people like Sully. We no longer speak the same
language. And before long, we just stop hanging out with
those who aren’t like us. That’s the way it often goes, and
it’s tragic, because somewhere along the line even our
compliments start to sound offensive. We start to say
things like: “You’re pretty brave, for an unbeliever.”
And folks like Sully have just as much trouble
communicating with us. They don’t know our rules.
What is acceptable? What is offensive? And if they do,
the rules seem arbitrary. I know that Sully felt this way
because somewhere in the middle of a blog post about
the debacle at the pastors’ dinner, he asked why it was
okay for evangelicals to make fun of Catholics (one of the
biggest laughs of the night had been a fairly innocuous
Catholic joke), but for some reason, saying a four-letter
word for “poop” could get you in big, big trouble. After
all, he thought, aren’t Catholics people? And isn’t poop
just poop?
He didn’t get it. And for many of the pastors, the
feeling was mutual. Around the room with our dinner
rolls and our sensible shoes, many of us looked a lot
 
 
136 CHURCH
alike. We looked like Sully. Most of us were middle-
class Americans with mortgages, kids in braces, and a
weakness for fried food. But despite the similarities, we
spoke a different language. It involved many of the same
vowels and consonants, but it was different nonethe-
less. It was different enough that most of us had about
as much chance of communicating the gospel meaning-
fully to Sully, as we had communicating it meaningfully
to a golden retriever. It wasn’t going to happen, and that
night it hit me.
So for the first time in my Christian existence, I
prayed that God would allow me to speak in tongues.
Not exactly like the big-haired TV preachers. But in a way
analogous to how they did at Pentecost. I prayed that
Jesus would breathe his Breath into me and grant me the
ability to communicate his story in ways that make sense
to Cretans, Arabs, and stand-up comedians. I prayed for
a language that outsiders could understand. And even as
I prayed this, I had to admit that if it does happen, it will
be a miracle.
But then again, I believe in those.
Step Two Must Die
Unfortunately, for all of its importance, the day of
Pentecost lasts only twenty-four hours. It comes like a
flash flood in Acts 2, and it’s over by chapter 3. It is one
day, and although it alters human history forever, it is
barely a blip on the chronological radar. The fire-tongues
and Spirit-Breath are impressive, but after the emotion
of the church’s birthday subsides, the baby needs to
 
 
137Why You Shouldn’t Buy My Business Book
grow up. And if my seventh-grade yearbook picture is
any indication, growing up involves some awkwardness
in the transition.
For the early church, the primary growing pain
involved a difficult question: Would Christianity be
open to all cultures and ethnicities, or would it remain
the private property of a select few? Would the Jesus-
revolution remain a race-and-tribe-based club, or would
it grow into the fulfillment of God’s promise to Abraham
that all nations would be blessed?
The question arose because the earliest disciples
were members of a single cultural and religious heritage.
They were Jewish. And they did Jewish things. They
worshipped at the Jewish temple, ate Jewish (*******her)
food, and read extensively from the Jewish Scriptures.
They were children of Abraham, and in this sense, their
faith was a family thing. In the minds of some folks
(called the Judaizers), you could join the family, but that
required a two-step process.
Step #1: Leave your old allegiances (to money,
power, idolatry) and place your faith in
Jesus.
Step #2: For Gentiles, leave your cultural heri-
tage (the ethnic identity you were raised
with) and become a Jew.
Both steps were difficult. The first step was hard
because it involved acknowledging the authority of
a new Ruler (or Lord) at a time when many false gods
(including Caesar) demanded one’s worship and alle-
giance. The second was difficult because it involved
 
 
138 CHURCH
rejecting one’s heritage, one’s culture, and in essence,
one’s identity. And if this were not enough, for adult
males, step two meant going under the knife for an
operation that would make even a linebacker cry like a
baby: circumcision.4
It was step two that was keeping non-Jews out of
the Jesus-movement, and for good reason. The shame
of publicly renouncing one’s ethnic and cultural heritage
brings to mind some of the worst chapters in human
history: genocide, lynch-mobs, ethnic cleansing. It
brings to mind the old photographs of Native Americans
forced to cut their hair and put on choking neckties in
order to be Christianized—by which was meant: be made
white. Such ethnocentrism dredges up the memories of
African slaves who were caught and shipped like cargo to
a foreign land where they would be given Christian names
for life in a Christian country.
We may cringe at such practices today, but the
church’s biggest conflict after Pentecost revolved around
this question: Should following the God of Jesus (the
God of Abraham, Isaac, and Jacob) require the rejection
of one’s original ethnic identity? Did it require a person
to become Jewish, by virtue of the law of Moses, in order
to become a Christian? In other words: What should be
done with step two?
What the early Jesus-followers did with the so-called
second step is truly astonishing. In the face of numerous
Old Testament rules on everything from circumcision,
meat, and table fellowship, the young leaders of the
church eventually reached a startling conclusion: step
two must die.
 
 
139Why You Shouldn’t Buy My Business Book
The requirement that Gentiles must adhere fully to
the Jewish law had to be rubbed out in the hearts and
minds of Jesus-followers. It had to die. And with it,
dozens of scriptural laws that were meant only for the
Israel chapter would be set aside, not because they were
bad, but because they had been fulfilled in Christ.
If this sounds like blasphemy to you, then you know
precisely how some early Christians felt. Tough ques-
tions arose within the church: Are not those commands
on circumcision and food laws still in the Bible? Isn’t
Scripture God’s unchanging Word? What gives us the
right to ignore some laws—the ones against eating pork,
or getting your penis snipped—while still holding on to
other laws: like the ones on murder and monotheism?
Their answer went something like this: while God never
changes, certain commands belong to certain chapters in
his plotline.5 Thus, strange as it sounds: God doesn’t want
us to do everything the Bible says.
Why You Shouldn’t Do Everything the Bible Says
If that statement disconcerts you, let me clarify: you
shouldn’t obey all the commands in Scripture, not because
the Liberal-progressive-revisionists-who-probably-live-
in-California say so, but because the Bible does.
In our chapter on Israel, we made the case that
Yahweh handed down some laws for a rather subversive
reason. He gave them to preserve his people culturally
even as they refused to stand out morally. As the Old
Testament makes clear, Israel’s hearts were no better
than those of the nations. All humans stand enslaved
 
 
140 CHURCH
to sin. Therefore, it was because God’s children were no
different on the inside (with regard to their hard hearts)
that God preserved them by making them different on
the outside. This is one reason for the proliferation of
religious rules on everything from pork to penises.
But surface differences (on everything from food to
fabrics) were never the Creator’s ultimate desire. God’s
desire was that Israel would stand out because of her
love and fidelity to him. She was to care for the widow,
the orphan, and the fatherless. She was to worship God
alone, because all other gods will leave you high and dry,
and Yahweh alone is worthy. In other words, God wanted
Israel to express love for him through well-ordered love
for others. That’s it. This has always been God’s one
desire, in every phase of human history. Yet all of us
have failed. Like all of us, Israel went her own way, she
did what she thought best, and she became part of the
problem rather than a part of the solution.
So (as we have seen) the Creator made a brilliant and
surprising move. If Israel would be no different from the
neighbors morally, then God would make her different
culturally. And by this creative twist, God would sustain
his family until Someone came along and lived out the
heart of the commandments right down to the last punc-
tuation mark.
Quite simply, Jesus filled that role. His life kept the
soul of the Torah (the ancient law of Moses), his death
paid the debt of sin, his resurrection proved his victory,
and his bodily ascension made space for a new body here
on earth—the church—his corpus filled with his Spirit.
 
 
141Why You Shouldn’t Buy My Business Book
Now, by grace alone, it is our job to continue the work of
renewing creation through the same Spirit that hovered
over the chaotic waters back in Genesis 1.
This is why some of the Old Testament laws on every-
thing from circumcision to animal sacrifice no longer apply,
not because they were bad, but because they belong specifi-
cally to another chapter in God’s Story. They are like grand
sailing ships once used to carry travelers from England to
America. They were essential for the journey, but unnec-
essary upon the newfound land. Their good purpose wa

بب2222

۷ بازديد
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
188 CONCLUSION
And when we glimpse God in the face of Jesus, all we
know of religion must be readjusted. In most cultures,
the gods were but monstrous amplifications of human
power, violence, and vindictiveness. Yet in a Galilean
Jew, divinity becomes small and humble.4
God becomes a Jewish peasant, and his lineage
proves the purpose of calling forth this family in the first
place. Through the Law and Prophets and all who went
before, the Creator was cultivating a culture in which the
work of his Son might be made intelligible. Jesus comes
as an Israelite, but in another sense, he comes as Israel.
He is the true Israel, the Suffering Servant, the true
representative of all humanity. He is the Second Adam,
and he must do what God’s people could not do alone. He
must face down sin and death, absorb them in his broken
body, and reveal what it looks like for God’s kingdom to
come on earth as it is in heaven.
Through the broken-and-resurrected body of Jesus,
God wins the decisive victory over sin, death, and the
devil. In his life, death, and resurrection, the entire
narrative pivots into a whole new phase. In this phase,
evil still lives but as a kind of death-row criminal whose
time is short. Its fate is sealed as we glimpse our future
in the resurrection of the Messiah.
By living as a peaceful revolutionary, Jesus reveals
what our own lives must look like. We must be advocates
for justice and compassion. We must confront the three-
fold evils of religious pride, pagan self-indulgence, and
imperial arrogance. We must spend ourselves on behalf
of others and in so doing we must imitate the way of our
Savior. We must be his body.
 
 
189Why the Beatles Want to Fish
5. Church
There is, however, a problem with being God’s body. We
are not like God. We are sinful, and we tend to act more
like the dysfunctional family of the Old Testament than
the carpenter from Nazareth. We may be forgiven, but
we are still broken. And most days, the brokenness is
readily apparent. In other words, we have a tendency to
become a part of the problem too.
For this reason, the fifth movement in God’s plotline
is about the gift with the power to transform ordinary
fishermen, plumbers, and gym teachers into entirely
new people. The gift is God’s Breath. Or, if you prefer, his
Holy Spirit.
Through the coming of the Spirit at Pentecost, the
Jesus community is empowered to reach out to a world
that does not know the news about King Jesus.5 We are
made new (over time) both internally and externally.
As believers, we are blown by this Wind toward a more
loving and generous existence. The Bible calls this “holi-
ness.” And as it did for the first disciples, God’s Breath
compels us to set aside our prejudices in favor of a
new reality: the ever-expanding family of God. While
membership in this family used to involve an ethnic and
national identity, now there is but one stipulation: alle-
giance to King Jesus.
Just as it did for the early Christians, God’s Holy
Spirit compels us to speak the language of outsiders, to
be bold yet humble, and to invite even the most unlikely
folks to join the revolution. In this way, the church is
not a business, but a body. We are not a corporation, but
 
 
190 CONCLUSION
the corpus Christi here on earth. As Christ’s body, our
mission is not just saving souls for heaven, but joining
the Spirit of the Creator-God in renewing the totality
of creation here on earth: everything from economics
to agriculture, foreign policy to after-school programs.
In these and other ways, the Spirit goes about the quiet
work of making all things new. And just as it was within
the book of Acts, this humble work of restoration often
goes unnoticed by the powerful and proud. But it is no
less real because of that.
6. New Creation
We are motivated to live this life of reckless love because
we believe in the resurrection—not just that of Jesus,
but of ourselves and of our world too. While some may be
content to hunker down under the protective bubble of
the Christian subculture until a time when Jesus beams
us up, the Scriptures speak of something quite different
with regard to the final chapter in God’s Story. In addi-
tion to being with Christ (spiritually) upon death, the
Scriptures also speak of a day when God’s kingdom will
come fully on earth as it is in heaven. The earth itself,
as Isaiah said, “will be filled with the knowledge of the
Lord as the waters cover the sea” (11:9). And on this
day, all things will be made new. This is the hope of new
creation.
We await the return of Jesus, not because it provides
a chance to be whisked away from this evil world, but
because it promises the redemption of God’s broken
creation. Evil will be judged, and truth will be vindicated.
 
 
191Why the Beatles Want to Fish
As Paul states: “the dead in Christ will rise” and “we will
be with the Lord forever” (1 Thess. 4:16–17).
History will end in the embrace of loving commu-
nity. There will be a celebration. Wine and worship will
flow together at a marriage feast. And we will praise the
Creator who brought beauty out of chaos and crafted the
greatest drama of them all: the Story of redemption.
We read the Scriptures to find our place within the
messy masterpiece. But just knowing the movements
isn’t enough. The goal is not accumulating answers for
Bible trivia. The goal is living in such a way as to join
the Hero in seeing things end well. Because whether we
know it or not, the Author is moving the composition to
its beautiful conclusion.
When that happens, our common hope will be real-
ized. The same ache that once drew us into stories of
all kinds will be healed. The deep human fissure will be
mended. And on that day a greater story will begin. The
page will turn in God’s grand novel, and we will spend
our days in headlong pursuit of the One who “reconciles
the ill-matched threads of our lives and weaves them
gratefully into a single cloth.”6
 
 
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193
NOTES
Introduction
1. Our word for “Bible” comes from the Latin: biblia (liter-
ally: “books”).
2. Though we use this analogy quite differently, it was
Brian McLaren who first introduced the Bible-as-puzzle
metaphor to me in a live talk I attended in 2008.
3. The idea of Scripture as a “script in search of actors”
is drawn appreciatively from the many works of N. T.
Wright.
4. This six-chapter model is not entirely unique to me,
nor is it sacred in and of itself. There are other ways
of dividing up the Story that may work just as well.
The current model owes much to the more in-depth
work of N. T. Wright, as well as the other thinkers
and theologians cited as follows. For a slightly more
academic rendering of the six-part drama, see Craig G.
Bartholomew and Michael Goheen, The Drama of
Scripture: Finding Our Place in the Biblical Story, 2nd ed.
(Grand Rapids, MI: Baker Academic, 2014).
Chapter One
1. The story in question is a Babylonian creation myth
entitled Enuma Elish. It dates (according to some
scholars) to the second millennium BC.
2. To be fair to Job’s wife (or at least fairer than most
Christian commentators have been), no one would
 
 
194 Notes
likely suffer more from Job’s death than she. Thus,
when she commands Job to “curse God and die,” we
cannot be sure of her true motives. Did she blame Job
for her children’s deaths? Did she merely want to end
Job’s pain? Or was she just playing out the script that so
many of us have at one time or another: hurting people
hurt people?
3. The Old Testament scholar John Walton argues that
the very language that is used of Eden and creation
in Genesis is meant to evoke the idea of an ancient
temple. Just as the presence of a deity was seen to
“rest” (or inhabit) a temple via his “image” (idol), so too
God “rests” and inhabits his creation, in part, through
his image-bearers (humanity). See especially John H.
Walton, The Lost World of Genesis One: Ancient Cosmology
and the Origins Debate (Downers Grove, IL: IVP, 2009).
4. It is somewhat controversial in theological circles to
refer to the Trinity as a “community.” The understand-
able fear in such language is that it tends inherently
toward tri-theism (the belief that there are three gods
to be worshipped). While this danger must be avoided,
there is precedent in the Christian tradition for speaking
of the one God as an eternal koinonia “communion.”
This is so especially in the Cappadocian Fathers of the
fourth century—who helped the church to articulate
the doctrine of the Trinity: One God, existing eternally
in three persons: Father, Son, and Holy Spirit.
5. For more witty insights on faith, life, and circus side-
shows, see Donald Miller, Searching for God Knows What
(Nashville, TN: Thomas Nelson, 2004), 61.
6. On the distinction between guilt and shame, see the work
of Brené Brown. A helpful introduction to this work can
be found in her (viral) TED Talk, “Listening to Shame.”
 
 
195Notes
Chapter Two
1. C. S. Lewis, Mere Christianity (New York: Macmillan,
1952), 46.
2. John Milton, Paradise Lost. Book IV, Line 370.
3. This is close to a famous (and perhaps apocryphal)
quote from the theologian Karl Barth. When asked by a
woman whether the Genesis-serpent actually spoke, he
was reported to have replied: “Madam, it doesn’t matter
if the serpent spoke. What matters is what the serpent
said.” As with the parables of Jesus, God-breathed truth
does not always have to come by way of rigid literalism.
Cited in N. T. Wright, Simply Christian: Why Christianity
Makes Sense (New York: Harper One, 2006), 183.
4. For whatever it’s worth, Genesis never claims that the
talking serpent is perched within the branches of the
fateful tree. The scene is just easier to paint this way.
5. Deuteronomy 21:22–23 hints at the ancient practice
of desecrating the bodies of convicts by hanging them
from trees. The fact that the Scriptures take time to
discourage this practice only corroborates the historical
and anthropological evidence that such things were
occurring among neighboring peoples. It also bears
noting that some Old Testament judges (namely
Deborah in Judges 4) would set up court under a
prominent tree. I am indebted to my Torah professor,
Dr. Gordon Hugenburger, for pointing out this textual
possibility as it pertains to Genesis 3.
6. This is how the prophet Jeremiah describes it: “[God’s]
people have committed two sins: They have forsaken
me, the spring of living water, and have dug their own
cisterns, broken cisterns that cannot hold water” (2:13).
7. As we’ll see in later chapters, this does not mean that
keeping God’s commands is what makes us right with
 
 
196 Notes
God. Only grace, poured out through Jesus Christ, can
do that. Nor does it mean that the Law does not have
some shady side effects when it comes into contact with
our fallen human nature. Stay tuned.
8. G. K. Chesterton, As I Was Saying, ed. Robert Knille
(Grand Rapids, MI: Eerdmans, 1985), 160; cited in
C. John Collins, “Adam and Eve as Historical People,
and Why It Matters,” in Perspectives on Science and
Christian Faith, 62 (Sept. 2010), 158.
9. Exactly how the effects of sin spread to humanity at large
is somewhat disputed among theologians. Some think
that it was simply passed on genetically, from Adam to
his offspring. Another view, however, sees the result of
sin as a kind of spiritual radiation that spread outward
from the blast, and enveloped the whole cosmos. Either
way, the Christian view is that the whole world is now
fractured, despite its abiding goodness and beau

2vg

۶ بازديد
 
 
 
 
 
 
 
 
48
5.2 Center Body Design
In Blended Wing Body configuration, both the fuselage (center body) and wings are
integrated with each other smoothly and acts as a single body. The center body is composed of
distinct and separate wing structures, though the wings are smoothly blended into it.
The center body or fuselage results in most of the drag of the airplane (25-50 percent),
therefore center body of aircraft is designed in a shape to have minimum possible drag. Various
drags which act on fuselage are [6]:
(A). Friction drag
(B). Profile drag
(C). Base drag
(D). Compressibility drag or wave drag
(E). Induced drag
In order to have minimum friction drag, minimum wetted area is required for a given volume,
which further depends upon the shape of the body. Effect of shape on wetted area can be observed in
Fig 19. Sphere is the best option for minimum friction drag but it’s not conducive to the streamlines
and thus increases drag. Flatted disc is the second best option for minimum friction drag [14]. Profile
and base drag is determined by the front and after body shape. To have minimum profile and base
drag, ideal streamline flow is required over nose and tail. The drag related with compressibility due
to high speed is called compressibility drag. The compressibility drag includes any variation of the
viscous and vortex drag with Mach number, shock-wave drag, and any drag due to shock-induced
separations. Compressibility drag can be reduced by increasing sweep angle.
 
 
49
Cylinder shape used in conventional airplanes has lesser frontal area that results in lesser
profile and base drag as compared to BWB configuration. But cylindrical fuselage has more
frictional drag due to more wetted area than BWB fuselage for same volume
During designing of fuselage, trade-off has to be made between various drags to get best
possible shape. For BWB 601 fuselage, sphere is flattened to streamlined disk, which is
integrated with wings to have minimum wetted area.
Figure 19: Effect of shape on wetted area [14]
The cabin has to be designed for internal pressure in addition to bending, shear and torsional
loads. It should be noted that disc shape cabin requires more strength for same internal pressure as
compared to conventional cylindrical; this is due to the fact that in a conventional cylindrical
fuselage, internal pressures are carried more efficiently in hoop stresses by a thin skin, whereas for
disc shape fuselage, internal pressure induces large bending stresses which require heavier structure.
Studies have been conducted by NASA and Boeing to address this structural issue [4]. They
investigated two concepts: Multi bubble fuselage structure and single strong shell (Fig 20 and Fig
21). Multi bubble structure consisted of cylindrical shells inside main disc for sustain internal
pressure loads and outer skin to support bending. Boeing argued with multi-bubble theory and raised
the issue that outer skin still needs to be designed to take internal pressure loads in case there is any
leakage in the inner bubble. As the outer skin has to be designed for internal
 
 
50
pressure, there is no point to build inner shells. Their research concluded to use single shell structure
strong enough able to withstands all the loads. The additional weight due to heavy structure should
not be problem as the aerodynamic gains from BWB configuration will outnumber this weight
increase. For BWB 601 cabin design, single shell approach will be used (Fig

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lattice شبکه

۱۰ بازديد

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huddle در هم ریختگی ازدحام

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linger منتظر ماندن

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bursary بورسیه

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۱۰ بازديد
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