CX-HLS (Cargo Experimental, Heavy Logistic Support) designs & derivatives

[hesham]

You are bidding on an original press photo from 1964 featuring Artist's Concept of Boeing Transport Design The Boeing Co's bid to develop and produce the proposed CX-HLS heavy transport for their Air Force is based on company-funded studies beginning in late 1961, Boeing Magazine reported yesterday. Boeing is one of three major aerospace firms engaged in competition to design the CX-HLS (Cargo, Experimental, Heavy Logistics System.) The other contenders are the Lockheed Aircraft Corp. and a team headed by the Douglas Aircraft Co. Operations analysis, engineering design, testing a n d other work applied to the transport concept between 1961 and mid-1964, when the first study contract was awarded, have cost $10 million in Boeing funds, the company said. Boeing noted that in late 1961 its operations analysts carried out a study of the factors involved in the transportation of Army divisions by air. Studies in early 1962 made use of electronic computers to "load" all types of Army vehicles, including tanks a n d other heavy fire1964-10-20T14:02:33+05:30go compartment of various sizes. The purpose of this exercise was to determine the best fuselage size for maximum aircraft efficiency. Boeing Engineers later studied transport aircraft ranging from 400,000 pounds gross weight to more than 1 million pounds. Additional studies were made to determine which design would provide maximum cost effectiveness. Boeing studies showed a fleet of large logistics transports, such as the type studied, not only would provide vastly more efficient air lift but would do so over a ten-year period at a saving of "billions of dollars over presently programmed air lift." The basic concept for a CX-type transport has been substantially improved and re-fined by the company. At the moment, Boeing has a team of about 600 employes assigned to the CX-HLS project. Head of the team is H. W. Withington, long-time Boeing engineering executive. . Photo is 8” x 10” in size.

URL:

http://www.ebay.com/itm/1964-Boeing-Airplanes-Sketch-Press-Photo-/200812578339?pt=Art_Photo_Images&hash=item2ec15cc623

From Boeing magazine 1964

 

[Scott Kenny]

I wonder if the STF200 was an all-new design or similar in concept to the far later refanned JT8D-200 series?

It is noteworthy that Rolls-Royce was promoting a refanned Medway in this era as well - the 22,000lb st RB177-2.

The great irony is that it took longer than expected for high bypass ratio turbofans to dominate the commercial airliner market.

Takes a while to get the new fans civilian-certified, and the airlines are unlikely to want to divest of their existing planes till they're fully depreciated. 10 years minimum service time, and often closer to 20 years in service before their initial buyer sells them off. It'd take an absolutely enormous fuel price hike to make airlines even consider the idea, and that price would have to stick for almost a decade.

So while some planes got re-engined with JT3Ds or CFM56s, that wasn't until the 1980s. Everything else was new build (757, 767, A300 series) so basically replaced 707s etc when the airlines sold off theirs. 727s were still going pretty strong in 1998, and just getting an engine with a giant muffler to comply with noise rules. MD80/90s got fans to comply with noise rules.

Barring some oddities like the gravel kit equipped 737s. Those are the old skinny jets and will never, can never be fans.

 

[publiusr]

Found this pic of Boeing C-5 fuselage mock-up in Air Pictorial, March 1965.

Regards
Pioneer

The 777 engines could have gone under that shoulder mount wing with less problem than that single one on the 747 testbed:

This weird-looking plane isn't a joke

When GE tests a huge new engine, it mounts it on an old 747. Boy, does it look odd.

www.cnet.com

A missed opportunity for a two-fer.

As fans get larger…maybe dihedral gull wing mounts at the roots for even more ground Clarence…wait…

 

[taildragger]

Recently acquired model of the Douglas D-906C. It looks a little smaller than the CX-HLS contenders, probably as large as possible with the 4 low-bypass turbofans depicted. I'm not sure how it relates to the C-5 competition, so please relocate this if there's a better place for it. One unusual feature is what looks like a break aft of the cockpit where the nose would swing open. There are no hinge fairings or details of how the nose gear would be arranged.

 

[Scott Kenny]

Recently acquired model of the Douglas D-906C. It looks a little smaller than the CX-HLS contenders, probably as large as possible with the 4 low-bypass turbofans depicted. I'm not sure how it relates to the C-5 competition, so please relocate this if there's a better place for it. One unusual feature is what looks like a break aft of the cockpit where the nose would swing open. There are no hinge fairings or details of how the nose gear would be arranged.

I'd expect that the nose gear would be just aft of the break, to make things simple.

 

[taildragger]

I'd expect that the nose gear would be just aft of the break, to make things simple.

That's one way to do it but it requires the weight and other loads of the nose section to be carried across 1 or 2 hinges and one side of the fuselage when the nose is open.
Another way would be to distribute the gear fore and aft of the break so that the nose section could be supported directly. The forward would have a nose-open position matching the radius of the opening process. The rear element could be an actual 2nd nose gear or consist of one or more struts that would only be used when parked.
My guess is that having a real landing gear aft of the break and a parked-only gear forward of the break would be most efficient.

 

[Jemiba]

Recently acquired model of the Douglas D-906C. It looks a little smaller than the CX-HLS contenders, probably as large as possible with the 4 low-bypass turbofans depicted. ...

I may be wrong, but it rather reminds me on the D-900, especially with the cockpit still in the DC-8 style.
https://www.secretprojects.co.uk/th...nsport-proposals-pre-cx-hls.20056/post-187382

 

[overscan (PaulMM)]

The six engine D-906 (sans suffix) was 220,000lb OWE and 606,0000 lb MTOGW with 192.21ft wingspan and 190.7ft length.

It seems D-606 spans CX-4 / CX-X timeframe, before CX-HLS.

 

[Antonio]

American Secret Projects. US Airlifters since 1962. G Cox and C Kaston. Ed Crécy.

D-900 can be found as a 3-view drawing at Pg 19. And model photos in Pg 20.
D-906A 3 view drawing is on page 31 (D-906C was a 4 engined variant of the 6 engined D-906A)

Both D-900 and D-906 look almost identical in any detail. D-906 was larger than the D-900 ( 191 ft long 192 ft span vs 175 ft long 175 ft span )
but this is not clearly apparent from a drawing or a model.