dstefanc
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Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 12:53 pm

Hi. I don't know if this question was asked before; I couldn't find anything in the search. Sorry if this circled through the forums before. Anyways, do any of You know how the whole 7_7 numbering of Boeing planes started, what the significance behind that is, ect. Also, at the same time the whole Airbus thing with 3_0 (usually, excluding 319, 318, ....). Thx a lot in advance for the replies.

Damian
 
AeroWesty
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 12:56 pm

It was derived from the registration number of the prototype: N70700
International Homo of Mystery
 
goboeing
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 2:16 pm

I do not remember where I read this, but 700 was the series of Boeing's commercial aircraft. Maybe 300 could be missiles, 400 could be space equipment, etc. Bill Boeing added 7 to 700 for good luck and that was the 707.

Nick
 
LeanOfPeak
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 2:29 pm

Hearsay has it that 707 is derived from one-half the square root of 2, which is the sine and cosine of 45 degrees, which may or may not have been the originally-intended wing sweep angle. Then they liked the 7's and stuck with them.

Whether any of this makes any sense is up to you.
 
AeroWesty
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 2:36 pm

Bah, the cobwebs in my brain need sweeping.
Airline interest was somewhat slow in coming, however, so Boeing officials looked to give the project a new, more memorable name. The Model 367-80 had never been intended as anything more than an internal designation. Models in the 500s had been reserved for gas turbine engines and the 600 series for missiles. The 700 series was again intended for aircraft, so the company board decided to officially christen the Dash-80 as the Model 707.

There's more here:

http://www.aerospaceweb.org/question/planes/q0134.shtml
International Homo of Mystery
 
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HAWK21M
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 2:42 pm

Bill Boeing added 7 to 700 for good luck and that was the 707.


Arn't We glad he did  Smile
regds
MEL
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Newark777
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 2:47 pm

Hearsay has it that 707 is derived from one-half the square root of 2, which is the sine and cosine of 45 degrees, which may or may not have been the originally-intended wing sweep angle. Then they liked the 7's and stuck with them.

That's pretty interesting. The numbers work out, but I'm not sure if that is why they chose 707.

Harry
Why grab a Heine when you can grab a Busch?
 
Skydrol
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 2:52 pm

Seems this series of numbers is popular elsewere too...

Swingline has a series of common staplers numbered 747, 767 etc.

Solomon made ski bindings 727, 737, 747, 757, 777 etc.

Sharp made a series of boomboxes GF-767, GF-777, GF-787



Boeing isn't the only company with product line model numbers like this!


Anyone know any others?


LD4
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lincoln
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 3:31 pm

So I'm not the only one who noticed the Swingline 767  Smile

Every time I have to (*shudder*) manually staple something (usually when the photocopier is out of staples) I wonder if it's just a coincidence Big grin

Lincoln

[Edited 2005-01-29 08:03:15]
CO Is My Airline of Choice || Baggage Claim is an airline's last chance to disappoint a customer || Next flts in profile
 
dstefanc
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RE: Why Boeing Numbers Their Planes 7_7

Sat Jan 29, 2005 3:36 pm

Thank You so much for all the feedback.

Damian
 
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Moose135
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 2:58 am

Hearsay has it that 707 is derived from one-half the square root of 2, which is the sine and cosine of 45 degrees, which may or may not have been the originally-intended wing sweep angle. Then they liked the 7's and stuck with them.

That's the story I heard 30-odd years ago, and never heard anything else that sounded remotely believable.

Moose
KC-135 - Passing gas and taking names!
 
Thrust
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 4:00 am

GoBoeing is absolutely correct. In my "Boeing Jetliners" book, Boeing explicity states that they originally were going to call the 707 the 700, but since 7 is a mystical number and since it sounded better, the name 707 was substituted for 700. Thus came the 727, 737, 747, 757, 767, 777, and now 787  Smile/happy/getting dizzy
Fly one thing; Fly it well
 
ozzie
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 4:04 am

When I was on the tour of Everett a couple of years back the tour guide driving the bus around the pre-delivery dock area was asked this same question, and she too gave the answer that 7 was seen as a mystical, and lucky number not necessarily by the engineers but the public as well.

Oz
 
OldAeroGuy
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 4:20 am

Goboeing's reply is correct.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
FCKC
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 4:55 am

Nice to know the story behind this number 7.

For Airbus it's more simple.
The first plane was a 300 seats plane , so Airbus + 300 = A300



 
wilcharl
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 6:07 am

Every Boeing model has had the # 7 associted with it... I have brought this up many times before... its a mystical thing... even the military products...
B-52..... 5+2=7
B-29..... 9-2=7
KC-135..... 5+3-1=7 or its Boeing Int. Designation of 717
B-17
CH-47
 
ltbewr
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 6:23 am

The number 7 is considered very lucky in many cultures, especially in Asia. As to the staplers, they just copied the names from the Boeing a/c models as sounded so 'jet age'. I have a '767' model Swingline stapler on my desk.
 
Av8trxx
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 7:36 am

The Boeing historian Mike Lombardi replied to my Email about this very subject a few years ago. He told me that the marketing department was responsible for the 7x7 designators with the birth of the "707" as they thought the illiteration of the format was very favorable, in addition to sevens being 'lucky' and -700 series for commercial a/c concepts. The mathematics idea about the 707s wing was nice, but someone showed how it didn't truly work out and it's an urban legend. (Can't find it right now.) However, here's an excerpt about this topic-

Whatever happened to the 717?
by Ed Brown
Fortune magazine; 2/2/1998

Boeing announced in early January that it is rechristening the McDonnell Douglas MD-95 as the Boeing 717-200. But why wasn't there already a 717 in the skies? There's the 707, the 727, the 737.... The gap hints of an Edsel-like disaster in the company's past. But it's not that. The first 717 had its day--as a military cargo and airborne-refueling plane called the KC-135.

In the early days, says Boeing historian Mike Lombardi, the company numbered its products sequentially, starting with 1. Boeing kept this up until the 1950s, when it assigned a set of numbers to each of its product lines--600 for missiles, 700 for commercial jets, etc. Every significant initiative within a given series, even if it was just a sketch, got a number, which explains why Boeing's first commercial airliner, unveiled in 1954, was not the 700 but the 707. Then the marketers decided they liked the palindromic ring of "707" so much that every 700-series jet name would end with 7.

The prototype that produced the 707 also spawned a military jet, which was marketed as the 717. Once the U.S. Air Force renamed the plane according to its own classification system, however, everyone--including the folks at Boeing--started calling it the KC-135. Boeing stopped making the plane in 1965, but about 550 of them are still in use by the Air Force. "

 
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solnabo
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 7:42 am


So when do we see B 7-11 in the sky?

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frontiers4ever
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 8:24 am

yeah the Boeing 7-11 could becalled the Quicky Mart.

-Frontiers4ever
Until you prove, your right, your wrong
 
Julius2005
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 11:11 am

Its been very interesting hear about the meaning of 707 designations for boeing`s a/c
JRHAV
 
virgin747
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 11:32 am

I heard the 707 was called because it was the 707th design of the plane. How the rest was is a mystery to me...
 
Areopagus
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RE: Why Boeing Numbers Their Planes 7_7

Sun Jan 30, 2005 11:40 am

Every Boeing model has had the # 7 associted with it... I have brought this up many times before... its a mystical thing... even the military products...
B-52..... 5+2=7
B-29..... 9-2=7
KC-135..... 5+3-1=7 or its Boeing Int. Designation of 717

Oh, come now.

B-17
CH-47

Also the 307 airliner, the B-47 bomber, the KC-97 tanker, and the Vertol 107 (=CH-46) helicopter.

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