Boeing 707 concepts

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Donald McKelvy
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Boeing 707cfm T E S T airplane model found on eBay.

URL: http://www.ebay.com/itm/Rare-Vintage-Pac-Min-Pacific-Miniatures-desk-top-707cfm-T-E-S-T-airplane-model-/160698294779?_trksid=p3286.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D3%26po%3DLVI%26ps%3D63%26clkid%3D5029319183342303943

Seller's description:
Pacific Miniatures Inc. Alhambra, Cal................Pac Min is now located in Fullerton, Cal. The desk top model is in GREAT condition and would be a great piece to add to your collection.......I will pay for shipping,insurance and tracking in the US only. I do not offer any returns so please feel free to ask me any questions before buying. I am currently entertaining reasonable offers, so please do not hesitate to make an offer.......
The following information is quite interesting concerning the cfm56....so I thought I would share it.
The Test Model was made in the mid 70's, and the the last "true" B707 built was cn 21956/941, first flown on 27 November 1979. It started life as the sole B707-700 with CFM56 engines in the 70's, used by Boeing as a testbed in Seattle. It was converted to become a "normal" B707-300C, namely B707-3W6C CN-ANR of the Moroccon Government, delivery date 10 March 1982. This model is a rare and great find!
 
Boeing 707cfm T E S T airplane model
 

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Boeing 707cfm T E S T airplane model
 

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Model of Boeing 707-500 and 707-700 located at the Boeing Archives Bellevue, Washington.

During the late 1960s, Boeing considered a long-range stretch Boeing 707. The 707-500, would have had the fuselage lengthened by 200in, 510cm enabling another five seat rows to be installed. This would raise passenger capacity to 225. The 707-500 would probably have been powered by refanned JT3Ds. It never went into production.

Source:
http://airchive.com/html/museums/boeing-archives-bellevue-washington-usa/boeing-707-500-and-707-700-models-at-boeing-archive-circa-1960s/19055
 

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Model of Boeing 707-820 located at the Boeing Archives Bellevue, Washington.

During the mid 1960s, Boeing considered two stretched Boeing 707s. The two 707-820 versions were the 505 with a 45ft longer fuselage than the 707-320B, and the 55ft longer 506. Both would be powered by 22,5001b thrust Pratt & Whitney JT3D-15 turbofans and have the same bigger wing area, by root extensions which add nearly10ft to the span.

Source:
http://airchive.com/html/museums/boeing-archives-bellevue-washington-usa/boeing-707-820-model-at-boeing-archive-circa-mid-1960s/19056
 

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From Sienar's site;

https://info.aiaa.org/Regions/Western/PacificNorthwest/Other%20Public%20Documents/2009%20Technical%20Symposium%20Presentation%20Sharing/Presenter%20Presentations/Session%20A%20-%20Skyline%20Room/Benito%20Almojuela/The%20Development%20of%20Boeing's%20367-80%20-%20Almojuela.pdf
 

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From a Boeing publication, drawings only, no text.
 

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Part 2.
 

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Part 3, document text.
 

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Probably not the place for this but a short article of a Russian review of the 707.
 

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RAP said:
Probably not the place for this but a short article of a Russian review of the 707.

Damn! I wish that I had seen this back in 1958 in time to invest in Tupolev stock.
 
joncarrfarrelly said:
From a Boeing publication, drawings only, no text.
Thank you Joncarrfarrelly for sharing!
Is there more information available on Moddel 473-19 project, such as a date?
Thanks in advance.
 

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From Ailes 11/1955,

they studied a 150 proposals from 1946-1952,before they decided to choose this shape.
 

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This is really more of a secret paint job than a project - hopefully it's of interest. Recently listed Pan Am print on eBay shows an interesting variation on their classic Jet Clipper livery. The sky blue looks the same (although with a 60 year old lithograph, who knows?) but the tail colors are inverted, with the globe in white on a blue background and the cheatline tapers down under and glareshield rather than stopping at the windscreen. I doubt if this livery made it onto an actual aircraft and think PAA wound up making the right choice. s-l1600a.jpg
 
Last edited:
Another early variation on the Pan Am Jet Clipper livery. This model recently sold on eBay has the ultimately selected blue globe but retains the blue cheatline sweeping below the glare shield rather than stopping at the cockpit windscreen.
1574567392117.png
 
the Boeing-707 family.
If you have a higher-resolution copy, can you confirm the label on the rightmost profile?

It looks very much like 'ADV C-138', which is rather interesting - C-138 is usually attributed to a USAF version of the Fokker F27. The aircraft certainly looks like a wide-bodied 707 derivative in USAF markings. Timing is about right for the SOR 182 competition, but of course as a low-wing aircraft it's nothing like either the C-141 or Boeing's 731 submission. The low wing and wide fuselage are an odd combination, so I wonder what the thinking was.
 
At higher rez it looks like "ADV C-135", so presumably Advanced C-135?
Need to dig out the relevant US Secret Projects tome I think...
 
A little googling yields the following brochures sold at auction:


From the first:
In the following pages, the Boeing Company presents the Advanced C-135. This aircraft, for which Boeing's internal designation is 738-21H, is derived directly from the military C/KC-135 and 707 current production transports and is offered both as a replacement for the C-124 and C-133 and as an adjunct to the C-130E and C-141.
The second brochure summarises the results of a loading study, confirming a requirement for a cargo envelope 13 feet high by 12 feet long and 85 to 100 feet long. This would require a new fuselage with tail loading, but using structural components and systems from the 707-320B and C/KC-135.
 
From the American Secret Projects: Vols 2 & 3 the following linage can be made out for the Model 738 series (all upwards-opening tail designs, the Model 735 were sideways-opening versions) during 1959-60:
738-1: based on 707-120
738-2: based on KC-135A
738-4: based on 707-420 (100-120,000lb payload, 450kt cruise, 5,500 miles)
738-6: based on 707-120

738-21H/ Advanced C-135: based on C-135A, enlarged fuselage (12 x 13ft cabin cross section), tail ramp, 11-13 463L pallets (100,000lb), 4,000nm with 60,000lb or 2,300nm with 100,000lb
738-21HM: Skybolt carrier with 4x GAM-48 Skybolt under inner wings, retained tail ramp and cargo capability for multi-role use
 
A 707 with Skybolts…that would be something to see.
The KC-135 was originally listed as a potential Skybolt carrier. A USAF memorandum from 1961 notes that the requirement was dropped in 1959 (along with the B-58 and B-70), but that it would likely be a reasonably straightforward addition. The main difficulty would be wing strengthening, the KC-135 would need parts of the B-52 bomb/nav system fitting, and probably only two missiles could be carried.
 
From ,Boeing 707 Pioneer Jetliner.
 

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