Last year a number of photos of the Lockheed L-2000 SST concept were sold on eBay. I didn’t get them, but the auctions came complete with some decent (not great) resolution scans of the photos. I have uploaded seven photos to the 2019-03 APR Extras Dropbox folder, available to $4 and up subscribers to the APR Monthly Historical Documents Program.
A magazine ad from 1967 showing a concept for a “Hot Cycle” helicopter. The “hot cycle” was a way to spin the rotors without imparting a massive torque to the fuselage as usually happens with helicopters, requiring a tail rotor to counter. here, instead of mechanically linking the engine to the rotor via drive shafts and gears, the engine exhaust was ducted up through the central rotor shaft, then out to the tips of the rotors, and then ejected through thrust-generating nozzles. This would impart only a trivial amount of torque to the fuselage, largely from friction with the shaft bearings. it was a great idea, but there were some issues with leakage around the bearings as well as being impressively loud and fuel-hungry.
Note that while the “hot cycle” eliminated the great majority of the need for an anti-torque tail rotor, this and similar designs still had one. This tail rotor would be used to swing the tail back and forth, yawing the aircraft at low speed.. This woudl require that the rotor be able to provide thrust in either direction on demand.
Lockheed’s entry into the FAA’s 1960’s Supersonic Transport contest was the L-2000. It was an appealing design, sort of a super-sized and angular Concorde. it lost to the Boeing 2707 due in no small part to the 2707’s swing wings… wings which wound up being fixed, like those of the L-2000.
In 1965 Lockheed released an exploded view of the L-2000’s structure, reproduced in Aviation Week, split across two pages. I took the images and fixed them; the full-size end result is pretty spiffy. I have uploaded the illustration, and two additional L-2000 images to the 2019-02 APR Extras Dropbox folder, available to $4 and up subscribers to the APR Monthly Historical Documents Program.
The Internet Archive has a *lot* of stuff. One thing there is a scan of the French-language aeronautical magazine “L’Aeronautique” covering 1919-1921. It is available in a number of formats, including PDF, here:
https://archive.org/details/la02b9eronautiqu03pari/page/n2
Included in this is a design for a truly gigantic aircraft with a wingspan of 110 meters, produced by Professor Junkers, presumably Hugo Junkers of Junkers Flugzeug- und Motorenwerke AG.Hugo was an innovator in the field of all-metal aircraft construction, including the first practical all-metal aircraft the Junkers J 1 from 1915. The giant aircraft would have a wing area of 1,400 square meters and a gross weight of 60 tonnes; 12 engines would produce 4,000 horsepower and drive six propellers. Two tractor props would have a diameter of 6 meters, while four pusher props would have a diameter of 3.7 meters. No performance data seems to be given, but it can be assumed that it was meant to be a long range passenger or cargo transport.
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Bonus: A helicopter design from one Douglas Shaw. This would have failed entertainingly.
Bell has unveiled their idea of what an electric intra-city VTOL “taxi” would be, in the form of the “Nexus” AirTaxi. one wonders if it’s more human than human?
On one hand, it bears more than a passing resemblance to the Bell X-22. On the other hand, there are some design choices there that make me scratch my head. The thrust from forward ducts would be bisected by the main wings at forward thrust and then blast right into the rear fans. During transition, the forward thrust would be disrupted by the main wings, which would seem to lead to some fantastic turbulence.
In the late 1960’s H.H. Koelle of the Technische University Institut Fuer Raumfahrttechnik in Berlin devoted considerable effort to studying a reusable heavy lift launch vehicle. A good, well-illustrated report was put out in 1968 covering the design:
Note that the Neptun was *gigantic.* It was a two-stage ballistically recovered design, unusual in that rather than being circular in cross-section it was hexagonal. The individual propellant tanks were each the size of or bigger than the S-IC first stage of the Saturn V.
A number of payloads were proposed. One was a sub-orbital intercontinental passenger transport, The passenger “capsule” would land separate from the Neptun itself.
One of the more interesting payloads contemplated was a large Orion nuclear pulse vehicle, transported in two pieces (propulsion module in one launch and payload/pulse units in the other). Presumably this would be a NASA Orion hitching a ride on a West German booster; I suspect politics would have negated the likelihood of the West Germans developing a mass production line for nuclear explosives.
This fusion-powered interplanetary spacecraft is also a NASA design, dating from the early 1960’s.
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In 1972 Bell designed a STOL jet transport, a concept that competed for the Advanced Medium STOL Transport role that the McDonnell-Douglas YC-15 and the Boeing YC-14 were built for. The Bell aircraft appeared to be largely conventional in layout, but it was actually quite different from every other transport: the engine nacelles were not only fitted with Harrier-like thrust vectoring nozzles to redirect the core exhaust, the flow could be diverted from the fans to augmenters in the wings. These, it was hoped, would greatly increase static thrust, allowing the aircraft to lift off from unimproved runways in a short distance. As part of their proposal, Bell also designed a proof of concept demonstrator to be built from parts of a C-130. The demonstrator could itself be used as a fair cargo transport, though of course it would not be as well optimized as the all-new vehicles. Unfortunately, the augmenter-wing concept for vertical thrust turned out to be a major disappointment as it steadfastly refused to scale up well.
The demonstrator was recently diagrammed and described in detail in US Recon & Research Projects #03, and the operational version in US Transport Projects #08.
USRP #3 can be downloaded as a PDF file for only $4.25:
USTP #8 can be downloaded as a PDF file for only $4.25:
I’ve uploaded the full rez versions of these scans to the 2018-11 APR Extras folder on Dropbox, available to all APR Patrons at the $4 level and above. If this sort of thing is of interest, please consider signing up for the APR Patreon.
The SST designs of the 1960’s are hardly unknown. But what’s generally not well understood is that designs such as the Boeing 2707 were *huge.* This was considered necessary because SSTs with fuselage lengths in line with existing jetliners – such as the Concorde – would have small passenger capacities due to the need for the fuselages to be *very* narrow compared to their lengths. This, as Concorde showed, was a great way to build an extremely cost-ineffective fuel hog.
So the 2707 would be terribly long and pointy, with a geometry quite a bit unlike regular jetliners. A practical concern is “how do we deal with these things at airports?” If nothing else, the long pointed nose of the SST would put the passenger door considerably further aft than for a conventional rounded-nose jetliners. So, like the 747 and the A380, it was assumed that the larger airports would have to make some infrastructure modifications in order to deal with these new beasts.
The illustration below, from a 1967 issue of Aviation Week, shows American Airlines thinking about the airports of the future. Note that the 2707 is pulled in far closer than the other craft, with the tip of t’s very pointed nose just a few feet away from the building while the others are notably further away. The SST is being serviced by two extendable jetways at maximum extension, while most of the other planes seem to be getting along with just one jetway… though one of the 747s is using four. Note that even though the 747 isn’t pulled in quite as far as the 2707, the SST nonetheless projects much further out into the airfield. For some airports this could well have meant that the taxiways would have been a cluttered mess.
Now available… four new issues in the US Aerospace Projects line.
Cover art was provided by Rob Parthoens, www.baroba.be
US Fighter Projects #03 is now available (see HERE for the entire series). Issue #3 includes:
USFP #3 can be downloaded as a PDF file for only $4.25:
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Cover art was provided by Rob Parthoens, www.baroba.be
US Launch Vehicle Projects #5 is now available (see HERE for the entire series). Issue #5 includes:
USLP #5 can be downloaded as a PDF file for only $4.25:
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Cover art was provided by Rob Parthoens, www.baroba.be
US Recon & Research Projects #3 is now available (see HERE for the entire series). Issue #3 includes:
USRP #3 can be downloaded as a PDF file for only $4.25:
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Cover art was provided by Rob Parthoens, www.baroba.be
US Transport Projects #8 is now available (see HERE for the entire series). Issue #8 includes:
USTP #8 can be downloaded as a PDF file for only $4.25:
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I’ve just sent out the rewards for October, 2018, to APR Patrons. This months rewards include:
CAD diagram: 20-meter Orion spacecraft
Diagram: Genealogy of Piper aircraft
Document: “Story of the Uprated Saturn I” NASA-MSFC brochure circa 1966 describing the Saturn Ib, including future possibilities
Document: “Preliminary Design Study of a Three Stage Satellite Ferry Rocket Vehicle,” 1954 Goodyear paper describing the METEOR launch vehicle. First of a number of METEOR documents I have.
Document: “The Rocket Research Aircraft Program 1946-1962,” Edwards AFB booklet describing the various rocket aircraft tested up to the x-15
If this sort of thing is of interest, please consider signing up for the APR Patreon.