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Author Topic: National AeroSpace Plane (X-30)  (Read 70569 times)

Offline Dronte

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Re: National AeroSpace Plane (X-30)
« Reply #15 on: April 29, 2006, 02:17:58 am »
Here two interesting drawings related with the program X-30 that (I believe) are not very well-known.
 
- An illustration of the possible escape system projected for the X-30, based on a ejectable booth  that would reduce the speed until Mach 1.3- 0.7 and a special version  semi-encapsulated of the ejection seats ACES 2 that would complete the escape sequence starting from that speed. Versions were also studied totally encapsulated to the style of those used in the B-58 or the XB-70 but I don't know any illustration of the same ones.

-The second drawing corresponds to the HALO (High Altitude Launching Option) proposed by Lockheed and dedicated to a preliminary exploration of the aerodynamic concepts implied in the X-30.
It was projected to be an airship of 17.7 meters that would be thrown by a SR-71 modified and it would reach speeds from Mach 10-12 to a altitude of 44200 meters.

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #16 on: May 01, 2006, 08:26:37 am »
Dronte, thanks a lot, I've never seen both things.
Can you point on a sources?
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Offline Orionblamblam

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Re: National AeroSpace Plane (X-30)
« Reply #17 on: May 01, 2006, 12:44:58 pm »
Dronte, thanks a lot, I've never seen both things.
Can you point on a sources?

Both of those bits of art were in Popular Mechanics 12 or so years ago.
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And so the endless circle of life comes to an end, meaningless and grim. Why did they live, and why did they die? No reason. Two hundred million years of evolution snuffed out, for in the end Nature is horrific and teaches us nothing

Offline Dronte

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Re: National AeroSpace Plane (X-30)
« Reply #18 on: May 01, 2006, 09:17:30 pm »
It is this way. The images are of the copies of November '92 and April '93 of the Argentinean edition of PM.

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #19 on: May 06, 2006, 03:37:51 am »
This is probably close to 'final' converged X-30 configuration (aka "configuration a202") and 1993 Langley TTD Tunnel photo (intersesting that WT model seems to lack scramjet module somewhere - may be, it's just aeroelastic model) - note that double-delta wings mutated to all-movable rudders while rudders and vertical fins leading edges became swept back.

"An unclassified aeroelastic vehicle representative of the NASP configuration and referred to as the demonstrator model was developed []. A NASP configuration published in Aviation Week served as the basis for this model. A classified model, referred to as the NPO model, provided by the NASP National Project Office provided guidance for modifying the wing and vertical tail planforms and the wing root condition.The planform and profile of the resulting configuration are shown in [pictures 1 and 2]. The vehicle fuselage is 150 feet long and weighs approximately 300,000 lbs fully fueled with a center of gravity at approximately 56 % of the fuselage length. The root leading edge of the all-moveable clipped delta wing begins at 70% fuselage length. The wing has a root chord length of approximately 27% fuselage length, a span of approximately 9.5% fuselage length, a leading edgesweep of 70" and a trailing edge sweep of 15". The pivot shaft attaches at 65% of the wing root chord. The curved symmetric airfoil is thickest at 65% chord where the thickness is 4% of the local chord. The demonstrator model has twin vertical tails with rudders; the rudder is not modeled structurally. The profile view shows that the forward section of the fuselage acts as a compressor for the airflow as it approaches the engine and the aft portion of the fuselage acts as a nozzle for the engine exhaust."

"The model fuselage geometry was based on an unclassified configuration furnished by the NASP contractor team which is headed by the National Program Office (NPO). The NPO had subsequently decided in favor of an all-moveable wing and produced a classified FEM refferd as to the NPO model. A representative all-movable wing was, therefore, developed and included on the unclassified demonstrator FEM shown"

Later mutations include even aerospike engines installed on the boattail between vertical fins according to Scott Lowther aka OrionBlamBlam, that makes this 'final something' close to that ARSLS (Advanced Reusable Small Launch System) concept above.
« Last Edit: September 24, 2007, 10:13:51 am by flateric »
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #20 on: May 08, 2006, 04:33:53 pm »
For those who really addicted - 20 Mb, 570 pages of

Title: The Hypersonic Revolution. Case Studies in the History of Hypersonic Technology. Volume III: The Quest for the Orbital Jet: The National Aero-Space Plane Program (1983-1995) 
AD Number: ADA441126   Corporate Author: AIR FORCE HISTORICAL STUDIES OFFICE BOLLING AFB DC   Personal Author:           Schwelkart, Larry   Report Date: January 01, 1998   Media: 474 Pages(s)   Distribution Code:           01 - APPROVED FOR PUBLIC RELEASE   Report Classification: (Not Available).   Source Code: 447256   From the collection:   Technical Reports

http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=A441126&Location=U2&doc=GetTRDoc.pdf

Sometimes it really more detective reading than DaVinci Code, and at least I know how what the hell is 'DuPont Government Baseline' and what the hell duPont did in NASP project.
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #21 on: June 06, 2006, 11:35:38 am »
This really funny diagram from NASP ground maintenance subcontractor (Sverdrup) pic shows X-30 vehicle clearance.
Funny is the fact that while first I thought that it can give an idea of pretty exact X-30 dimensions, then I've read that Sverdrup developed them 'by scaling sketches published in the open literature which showed a typical X-30-sized vehicle ajacent to a Boeing 747.'
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #22 on: June 18, 2006, 01:46:29 pm »
Boeing
Two design studies were completed, one was 'winged body', so-called government baseline, i.e. scaled-up duPont design, so basically all published illustrations if refered to this study is not far away from truth.
Later Boenig shifted to Langley-promoted conical accelerator, but entered a serious problems as result was VERY long vehicle with myriad stability/engine control problems. Boeing was downselected from competition.
« Last Edit: June 18, 2006, 01:48:59 pm by flateric »
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #23 on: June 18, 2006, 02:08:25 pm »
Lockheed
Skunk Works started with a lifting body concept like MDC (attached image from Lockheed CFD-realted paper can give an idea of this studies), but then, trying to accelerate design processs, witched from integrating airfame and propulsion system to putting two huge engines on the sides of a vehicle, abandoning the whole idea of integrated vehicle. Lockheed relied on using not-so-sophisticated construction materials. Weight were growing (Lockheeed's craft being the heaviest NASP design reaching almost 400 000 lbs), and Lockheed guys used trick of launching vehicle using set of wheels that dropped off after take-off (not so far from Copper Canyon and duPont concepts of sled launch), with the landing 'glide-style' on vehicle's belly. The other detail known is that initially crew cabin should be close to the center of fuselage and later moved to the nose, that made aviable it's separation as part of crew rescue system. No images are avaible on this design so far. Not surprising that Lockheed was also downselected.
« Last Edit: June 18, 2006, 02:18:07 pm by flateric »
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline CFE

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Re: National AeroSpace Plane (X-30)
« Reply #24 on: September 23, 2007, 09:33:32 pm »
The McDD concept is undoubtedly the inspiration for many artists' "Aurora" concepts.  The fact that McDD released these pictures publicly should tell us that Aurora DOESN'T look like these McDD drawings.

I have a pic of the McDD concept in FedEx markings.  I can have it scanned and posted by January.

As for the "a202 configuration," was that an internal NASA design, or did a contractor come up with it?

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #25 on: September 24, 2007, 02:52:19 am »
Recently published AIAA paper has an insight of MDC and GDFW way to the BWB with spatula nose. As we can see, actual early MDC design wasn't so far from the artists' impressions spreaded in the media.

Hypersonic Boundary Layer Transition Application to High Speed Vehicle Design
AIAA Paper 2007-0310, presented at 45th AIAA Aerospace Sciences Meeting, Reno NV, January 2007
Kei Y. Lau*
Advanced Global Strike Systems
Boeing Company
St. Louis, Missouri 63166

MDC

"In 1986, McDonnell Douglas won a contract under the NASP Technology Maturalization program to develop an experimental database for CFD validation, which was called the Generic Option 2 program. The database was to be used by the government team and the contractors for CFD development works. The shape for Generic Option 2 was chosen to be blended wing body (BWB) configuration derived from a MDC (McDonnell Douglas) design. The BWB configuration has a bi-elliptic cross section (second pic)... [Photo] shows the installation of the 36 inches aerothermal model in the Calspan 96-Inches Shock Tube Facility."
"The Generic Option 2 Aerothermal Test was very successful and generated a set configuration heating data from Mach 11 to 18 at flight Reynolds numbers. The test set includes configurations with sharp and blunt nosetips. It showed some puzzling boundary
layer transition behaviors that were not expected. At zero degree angle of attack, the sharp nose boundary layer transition onset occurred at the expected location. But the blunted nosetip did not move the onset location aft. When the angle of attack was
increased, the sharp nose onset location moved forward and the blunt nose onset location moved aft.
Additional test runs were conducted using distributed roughness strips at nose location. The strip usually worked very effectively on cones at the Calspan tunnels. It tripped the sharp nose boundary layer, but had no effect on the blunted configuration. The early
transition onset with the blunt nose is obviously not an artifact of tunnel noise. An explanation was needed to understand the transition behavior of this class of configuration.
The blunt nose puzzle was resolved after an extensive CFD and boundary layer rack data study. The bi-elliptic forebody was optimized using method of characteristic and streamline tracing during the configuration development. There was no crosstalk
between upper and lower surfaces in sharp configuration analysis. The blunted nosetip was addition for thermal protection purpose afterwards.
The introduction of the blunt nose caused strong crossflow on the windward surface that resulted in flow bi-focation along windward centerline and a thick boundary layer built-up. The crossflow bifocation de-stabilized the boundary layer and caused very early transition along the windward centerline. The crossflow diminished with increasing angle of attack and allowed the onset to move aft. At the nominal design angle of attack of 4 degrees, the blunt nose had a small effect in delaying transition onset compared to the sharp nose data, but the result nonuniformity of boundary layer circumferentially is causing drag increase and inlet performance impact.
In late 1986, the MDC NASP program established a tiger team to investigate the scramjet engine to airframe integration. In addition to mechanical issues, the figure of merits included propulsion performance, vehicle controllability, boundary layer control, thrust
vs. drag trade-off, inlet performance and flight angularity sensitivity. The lessons learned from Generic Option 2 test program on the difficulty in boundary layer control of a bi-elliptic shape was one of the consideration when MDC made a major configuration switch to a Non-circular-body (NCB) design.
In 1987, Beckwith reported difference in boundary layer transition onset between wedge and cone to NASP symposium at AMES based on an earlier AIAA paper he published on quiet flow tunnel design <...> The discovery helped affirm the decision to further develop the NCB configuration by the McDonnell Douglas NASP team. This configuration eventually evolved into the NASP
forebody shape as we know it today.

In the late 1980s, two sets of configuration boundary layer transition database were created by the contractors. The McDonnell Douglas tested with an early NCB (Non-Circular Body) design Configuration to gain more insight into boundary layer transition behavior of planar flow. The model was built of machined solid stainless steel block and micro-polish to better than 1 micron finish. Surface mounted pitot tube was used for transition onset detection. The test successfully demonstrated that the NCB configuration behaved like a wedge in transition onset. < Third pic> shows the MDC test model."

GD(FW)
"The General Dynamic-Fort Worth team took a different approach and tested four generic configurations. <Fourth pic> shows the GD-FW test models.
« Last Edit: September 24, 2007, 04:11:24 am by flateric »
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #26 on: September 24, 2007, 03:13:48 am »
Found sevaral more MDC Generic Option 2 Aerothermal Test configuration pics.
« Last Edit: September 24, 2007, 03:19:00 am by flateric »
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #27 on: September 24, 2007, 04:13:10 am »
As for the "a202 configuration," was that an internal NASA design, or did a contractor come up with it?

a202 was unified contractors/NASA design, a symbiosis of best design concepts
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline flateric

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Re: National AeroSpace Plane (X-30)
« Reply #28 on: October 19, 2007, 10:40:03 am »
Found some better quality GD NASP publicity leaflet
"There are many disbelievers in
stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline John21

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Re: National AeroSpace Plane (X-30)
« Reply #29 on: October 19, 2007, 08:16:23 pm »
How much would the technology help the commercial/private aircraft business if it was declassified today? I can understand keeping SOME things secret but why haven't these kind of air/spacecraft materialized into the public domain for commercial use? Maybe I just have a hard time understanding government bureacracy and secrecy. Or maybe I just don't plain trust them. >:( :(