Did the Bottom Up Review (BUR) performed by the Defense Science Board in 1993 and the then McDonnell Douglas F/A-18E/F Super Hornet kill the A/FX program?
Triton said:Did the Bottom Up Review (BUR) performed by the Defense Science Board in 1993 and the then McDonnell Douglas F/A-18E/F Super Hornet kill the A/FX program?
Stargazer2006 said:Compared to all the specialists here I have very little knowledge and rarely intervene in these high-level discussions...
One question though: if the A-12 design was partly flawed for the mission it was supposed to fill, and since the Navy did not design it, could it be in part because of the odd pairing of General Dynamics and McDonnell Douglas? Surely, the companies that had the biggest edge and experience in stealth design at the time (namely Northrop and Lockheed) were not involved. And so, can we assume that if G.D. had been paired with either of these on the A-12 program, the odds might have been different?
Sorry for interrupting your discussion with my (probably idiotic) question, but thanks anyway to anyone willing to take a shot at answering it!
LEG said:1. I don't believe the USN did or does know as much about LO as the USAF does.
They certainly didn't during the A-12 program when their approach created massive problems in both resonant dipole and optical scattering areas due to a mis-apprehension that RAM, layered on like the latest layer of linoleum in a 30 year old apartment, could solve for every issue. It doesn't. It never did. It is useful solely as surface coating to help blend discontiguous material junctures and as a deep channel 'circuit' to spread the impedance load around the airframe periphery. The USN broke both of those rules with the straight TE which scattered traveling waves as Rayleigh all across the front sector and with the nose which was so bad with multi-surface junctures around the inlets that they had to affix a bra to it like on a high end sports car. They showed similar errors in judgment with the design of the buried engines and in particular with the exhaust scheme which didn't provide for the active cooling as materials adjustment which LM was doing almost two generations earlier in the F-117. It was, bluntly, a _very bad_ idea to put a lower hemisphere exhaust on a VLO penetrator intended to operate in the heart of the trashfire because the USN flatly refused to believe that stealth could work, out of the clutter. Their experience with the A-6 drove part of this but it was still something which they should have known more of before they dared to set RFP specs for an airframe which was weight critical. Since the Navy was also going the cheap route and insisted the contractors break standing rules (after 1988) for a Fixed Price program by buying in on a spec'd airframe that it was essentially purchasd for 73 million instead of the 130 that even GDM originally requested, it became -essential- for them to kick down compartment doors into the ATB and 117 efforts and the USAF essentially said: "No, I'm bigger." the USN forced the companies to work both the weight reduction and the signatures issue while already in over their head from Concept Formulation onwards with freeby services. This is what put the program out of cost and it was obvious to everyone, including Elberfeld, from the outset, largely because men like Ben Rich were _telling them_ that they were not going to get away with cheap skating.
Contrary to the popular conception, there is no 'WEZ Bubble' condition-http://1.bp.blogspot.com/-DeD3FURlcPw/TYRKd9j_i2I/AAAAAAAAC7A/jA6HFDidIeU/s1600/LIBYA%2BALL%2BLAYERS.jpgIt is a single wedge of a TallKing/Nebo/Vostock type system-http://3.bp.blogspot.com/_0HCJq6B1wZA/SgJm8zs3UjI/AAAAAAAACG0/3YEgIRE6BVk/s400/WEDGESST17.jpg
JFC Fuller said:Just a quick question about the AX and A/F-X weapons bay dimensions. I read over the weekend that at one point it was intended to integrated JASSM with the F-117A and that the proposal got at least as far as the fit-checking stage. Bill Sweetman's "Lockheed Stealth" actually has an image of an F-117A with an AGM-158A on the trapeze launcher of the weapons bay. Were the A/F-X weapons bays intended to be the same size as those in the F-117A?
Thanks for sharing. What a beautiful bird. Imagine if we have a fleet of this bird today. Our strategy concerning the china sea would be a lot less headache to deal with.allysonca said:From the collection... came from a friend that worked at GD in Texas. Looks to be 1/40th I think.
GAU-8 Avenger said:On the AWST article discussing the companies involved and their proposals, it says Northrop joined the General Dynamics and McDonnell Douglas team which was proposing the A-12 based design. Yet on Matej's website these pictures are shown of a different Northrop A-X (or A/F-X) model.
I will presume Northrop was working independently on this, so what led to them teaming up with GD and McDonnell Douglas on their proposal? Personally I find this a very interesting looking design.
Sundog said:Both of those are in his book, plus a third. I won't post it here due to copyrights (Buy the book, it's worth every penny!), but the one not shown was the performance driven design. The first pic you posted was the balanced design, between signature and performance. (I see you posted it in the other thread and I think it violates the rules here, but that's for Paul to decide.)
Triton said:Concerning the A/FX, it sounds like the United States Air Force has, or had, a "not invented here" bias against Navy aircraft even though they were in need of a replacement for the F-111, F-15E, and F-117A and had participated in the AX program since its initiation. Was there any effort to save the program as a joint program between the United States Navy and United States Air Force? Or point out the 20% parts commonality between the F-22 Raptor and the Lockheed Martin/Boeing A/FX proposal? Or at the time, did the United States Air Force believe that the air interdiction mission was not as important as other missions or would have preferred the FB-22 to the A/FX? Was an F-16 replacement deemed more urgent?
SOC said:Contrary to the popular conception, there is no 'WEZ Bubble' condition-http://1.bp.blogspot.com/-DeD3FURlcPw/TYRKd9j_i2I/AAAAAAAAC7A/jA6HFDidIeU/s1600/LIBYA%2BALL%2BLAYERS.jpgIt is a single wedge of a TallKing/Nebo/Vostock type system-http://3.bp.blogspot.com/_0HCJq6B1wZA/SgJm8zs3UjI/AAAAAAAACG0/3YEgIRE6BVk/s400/WEDGESST17.jpg
Are all systems literally going to have a 360-degree engagement zone? Obviously not. But I'm sure you are aware of the fact that radars can rotate? A search radar like BIG BIRD rotates and views a 360-degree area, and will most certainly give you a "bubble". An engagement radar like TOMB STONE will give you a wedge, but the radar is fully capable of rotating to a new axis. It is simpler to show the "bubble", because that's the complete area the missile system or radar could be covering, and in the case of TOMB STONE that's the place you would like to not be.
Plus, making the circles is easier than plotting the azimuth of each radar system and then constructing the wedge. There's also the issue that terrain is not fully accounted for using the "bubble" method, but that's something I think I might actually have figured out how to fix. At any rate I always find this kind of argument hilarious, because is the way it was done (for those basic reasons) when the government was paying me to do it. Or do people really think that charts were annotated with some weird animated live-updating overlay capable of always knowing the exact azimuth of a TOMB STONE?
Also, TALL KING? That one rotates through 360 degrees, you can see one doing it here at the very beginning: http://www.youtube.com/watch?feature=player_detailpage&v=ZhdIrgjPzSo Pretty sure Vostok does as well based on some shots I've seen of the operator's console. TALL RACK (Nebo-U), however, I'm not sure about. I know the arrays are repositioned frequently, but I'm not sure if they rotate during scan or if they're rotated just to reposition their focus.
SOC said:Contrary to the popular conception, there is no 'WEZ Bubble' condition-http://1.bp.blogspot.com/-DeD3FURlcPw/TYRKd9j_i2I/AAAAAAAAC7A/jA6HFDidIeU/s1600/LIBYA%2BALL%2BLAYERS.jpgIt is a single wedge of a TallKing/Nebo/Vostock type system-http://3.bp.blogspot.com/_0HCJq6B1wZA/SgJm8zs3UjI/AAAAAAAACG0/3YEgIRE6BVk/s400/WEDGESST17.jpg
Are all systems literally going to have a 360-degree engagement zone? Obviously not. But I'm sure you are aware of the fact that radars can rotate? A search radar like BIG BIRD rotates and views a 360-degree area, and will most certainly give you a "bubble". An engagement radar like TOMB STONE will give you a wedge, but the radar is fully capable of rotating to a new axis. It is simpler to show the "bubble", because that's the complete area the missile system or radar could be covering, and in the case of TOMB STONE that's the place you would like to not be.
Plus, making the circles is easier than plotting the azimuth of each radar system and then constructing the wedge. There's also the issue thatTriton said:Concerning the A/FX, it sounds like the United States Air Force has, or had, a "not invented here" bias against Navy aircraft even though they were in need of a replacement for the F-111, F-15E, and F-117A and had participated in the AX program since its initiation. Was there any effort to save the program as a joint program between the United States Navy and United States Air Force? Or point out the 20% parts commonality between the F-22 Raptor and the Lockheed Martin/Boeing A/FX proposal? Or at the time, did the United States Air Force believe that the air interdiction mission was not as important as other missions or would have preferred the FB-22 to the A/FX? Was an F-16 replacement deemed more urgent?SOC said:Contrary to the popular conception, there is no 'WEZ Bubble' condition-http://1.bp.blogspot.com/-DeD3FURlcPw/TYRKd9j_i2I/AAAAAAAAC7A/jA6HFDidIeU/s1600/LIBYA%2BALL%2BLAYERS.jpgIt is a single wedge of a TallKing/Nebo/Vostock type system-http://3.bp.blogspot.com/_0HCJq6B1wZA/SgJm8zs3UjI/AAAAAAAACG0/3YEgIRE6BVk/s400/WEDGESST17.jpg
Are all systems literally going to have a 360-degree engagement zone? Obviously not. But I'm sure you are aware of the fact that radars can rotate? A search radar like BIG BIRD rotates and views a 360-degree area, and will most certainly give you a "bubble". An engagement radar like TOMB STONE will give you a wedge, but the radar is fully capable of rotating to a new axis. It is simpler to show the "bubble", because that's the complete area the missile system or radar could be covering, and in the case of TOMB STONE that's the place you would like to not be.
Plus, making the circles is easier than plotting the azimuth of each radar system and then constructing the wedge. There's also the issue that terrain is not fully accounted for using the "bubble" method, but that's something I think I might actually have figured out how to fix. At any rate I always find this kind of argument hilarious, because is the way it was done (for those basic reasons) when the government was paying me to do it. Or do people really think that charts were annotated with some weird animated live-updating overlay capable of always knowing the exact azimuth of a TOMB STONE?
Also, TALL KING? That one rotates through 360 degrees, you can see one doing it here at the very beginning: http://www.youtube.com/watch?feature=player_detailpage&v=ZhdIrgjPzSo Pretty sure Vostok does as well based on some shots I've seen of the operator's console. TALL RACK (Nebo-U), however, I'm not sure about. I know the arrays are repositioned frequently, but I'm not sure if they rotate during scan or if they're rotated just to reposition their focus.
Actually, you use sectoring to control for apparent RCS and ARM vulnerability. If you have groundwave or tropobounce (and a LOT of processor power) you can look over the near horizon, well beyond the nominal 12-15nm limit. So it becomes a matter of driving the threat into the weeds where you can use cheaper, gapfiller (Snow Drift, ADADS, Acoustics, even Observer Corps), to grab an alternative signature. But the sectoring is to take 'cuts' between the terrain masks and to specifically look across and even behind the threat ground track using an analogy of a lone lighthouse cuing a sudden flip of the switch on a Christmas Tree.
The standforward or escort jammer is suddenly hip deep in alligators and all your decoys and loitering ARMs/jammers (MALD/MALD-J) are beyond the point where they can surround sound dogpile the threat and force a strobe through a sidelobe. And then you're screwed. Because this isn't the 1960s where it was one Fan Song or Low Blow per target with 2 missiles. Nor even the 1970s where it was 2-3 missiles per two targets with a Straight Flush or LASHE as CW flood. This is 40-60 shots, all of which can be dumped, via SAGG/GAI, very quickly (Mach 7), on a torpedoes-down-bearing basis of saturating the target volume until someone's seeker cube overlays the threat occupation zone.
Which of course makes the whole F-35 'pack hunter' principle a great way to lose a four ship while simultaneously destroying your 'no target fusion repeats' ISR ability to vacuum the total battlespace for targets. Don't believe this is dangerous? Just look at the S-350 Vityez with it's essentially 'dumb launch box, smart network node' approach to putting a 9M96 TEL under every rock.
In fact, it is almost certain, just looking at the awkward, conventional, bulbous and bumpy, shape of the F-35 that 'RAM goodness, baked right in!' is a misnomer for what is almost certainly an active loading system as 'jammer at the skin' ability to cancel through some form of rapid impedance sampling system. As the SOLE justification for why the BAe ASQ-239 has had billions thrown at it for what is essentially a ELS capable (APR-47) RWR without a companion ARM. _Except_ that this system is measuring Doppler and Phase interactions, every couple inches, along the skin, to generate complex cancellation waveforms, without regard to wavelength vs. airframe surface geometries which are too easy to FES model weak points for.
I mean what idiot is going to fix his RAM capabilities to an in-composite ability where he cannot even change coatings or surface panels (short of PDM stripping the airframe) when, 'suddenly', a waveform changes and some complex phase or frequency loading variation of a multi-lobe AESA scan 'charges up' the old scheme until it starts to reemit like any other surface wave backscatterer.
If you have some form of nanocircuitry built in, similar to that tested on the A-10 with the spray-on, electrochromic, system (back in the 90s), whereby /turning off/ the optical countermeasures suite gave you RAM effect, presumably, you can apply selective charge as conditioned power through the system to specifically cancel inbound, longwave, emissions.
This is why the mission data files are so important and so regionally specific.
It is why the various services are not supremely red faced about the relative 'survivability' of a jet operating 400nm past the effective accompaniment radii of EW/SEAD escorts and within 10nm of a target which can probably shoot down the JDAM you drop, never mind the jet which carries it. Given DEAD is likely Mission #1 for the F-35 on the first 5 nights of the war (we have nothing else which will penetrate far enough in an A2AD environment dominated by BASM and ASCM), there is little point in a 'front sector only' (+/- 20` on either side of the nose) when you are going to have to bull your way through MULTIPLE layers of back-track looking radars which blink on and off to deny cruise and lethal decoy shots into their withers.
Everything we know and assume about contemporary stealth is likely 10-20 years out of date now. We're talking the same degree of advancement as from the Windecker Eagle to the F-117.
Triton said:Concerning the A/FX, it sounds like the United States Air Force has, or had, a "not invented here" bias against Navy aircraft even though they were in need of a replacement for the F-111, F-15E, and F-117A and had participated in the AX program since its initiation. Was there any effort to save the program as a joint program between the United States Navy and United States Air Force? Or point out the 20% parts commonality between the F-22 Raptor and the Lockheed Martin/Boeing A/FX proposal? Or at the time, did the United States Air Force believe that the air interdiction mission was not as important as other missions or would have preferred the FB-22 to the A/FX? Was an F-16 replacement deemed more urgent?
quellish said:LEG said:1. I don't believe the USN did or does know as much about LO as the USAF does.
They certainly didn't during the A-12 program when their approach created massive problems in both resonant dipole and optical scattering areas due to a mis-apprehension that RAM, layered on like the latest layer of linoleum in a 30 year old apartment, could solve for every issue. It doesn't. It never did. It is useful solely as surface coating to help blend discontiguous material junctures and as a deep channel 'circuit' to spread the impedance load around the airframe periphery. The USN broke both of those rules with the straight TE which scattered traveling waves as Rayleigh all across the front sector and with the nose which was so bad with multi-surface junctures around the inlets that they had to affix a bra to it like on a high end sports car. They showed similar errors in judgment with the design of the buried engines and in particular with the exhaust scheme which didn't provide for the active cooling as materials adjustment which LM was doing almost two generations earlier in the F-117. It was, bluntly, a _very bad_ idea to put a lower hemisphere exhaust on a VLO penetrator intended to operate in the heart of the trashfire because the USN flatly refused to believe that stealth could work, out of the clutter. Their experience with the A-6 drove part of this but it was still something which they should have known more of before they dared to set RFP specs for an airframe which was weight critical. Since the Navy was also going the cheap route and insisted the contractors break standing rules (after 1988) for a Fixed Price program by buying in on a spec'd airframe that it was essentially purchasd for 73 million instead of the 130 that even GDM originally requested, it became -essential- for them to kick down compartment doors into the ATB and 117 efforts and the USAF essentially said: "No, I'm bigger." the USN forced the companies to work both the weight reduction and the signatures issue while already in over their head from Concept Formulation onwards with freeby services. This is what put the program out of cost and it was obvious to everyone, including Elberfeld, from the outset, largely because men like Ben Rich were _telling them_ that they were not going to get away with cheap skating.
At the time, USN as an institution did not realize how low the signatures could go for a number of reasons. USN actually had run a number of their own LO programs previously, which may have lead them to false assumptions about the lowest practical signatures - and how to get there.
That said, what you are describing above is what happens when you take a design that has demonstrated some degree of LO success at medium and high altitude, and then shove it into the weeds out of negligence. GD did not understand *why* that design had some success, and why it would not work at low level.
And then there was TEAL DAWN. Same time period, different customer, different part of GD, may as well have come from a different planet.
shivering said:Thanks for all the info, LEG. Truly interesting.
flateric said:
Look like this:Matej said:"McAir Vought AXInlet 1993" Does somebody recognize this configuration? B-2 like air intakes on the top and the swept wing.
I don't think Northrop had anything to do with that design. That is just a development of the A-12 with a slightly higher aspect ratio.Does anybody remember the origin of the famous image GD/McAir/Northrop(?) A/F-X proposal? Thank You Very Much!!
Does anybody remember the origin of the famous image GD/McAir/Northrop(?) A/F-X proposal? Thank You Very Much!!
Lockheed says NATF meets nearly all AX requirements
Source: Defense Daily
Publication Date: 09-SEP-91
(Las Vegas) The Lockheed-Boeing-General Dynamics team's naval version of the Advanced Tactical
Fighter (NATF) currently meets 95 percent of the Navy's requirements for the future AX bomber,
Lockheed officials said last week.
"The NATF was developed with significant air-to-ground capability, and while I can't go into
numbers, I'd have to say it was significant and in fact, the way the NATF sits today it can meet 95
percent of the AX specification requirements," one Lockheed official said during the 34th annual
TailHook Association Convention last week. A request for proposals (RFP) was released to
contractors by the Navy during a classified briefing over a week ago outlining requirements for the
AX (Defense Daily, August 29). The service plans to procure 234 AX aircraft to enter the carrier
airwing fleet by 2010, according to the RFP.
The Lockheed official said that, "there were a lot of compromises in the YF-22 prototype design to
accommodate a Navy airplane, but we worked very, very hard on that."
"We have a Navy version that has a swing ring that was never built ... that is carrier-suitable and
also has a capability to get into the higher speed mode of the outer air stealth ... for the
strike/fighter design," the official said. He added that while the NATF was designed with both
strike and fighter capabilities in mind, "we feel very strongly that if the Navy chooses to go the
strike/fighter route in the AX, the type of airplane we would build on paper, or NATF, would be
competitive."
Lockheed officials also said that the aircraft can meet the service requirement of carrying weapons
both internally and externally. The Navy "could hang a bunch of bombs on it and still maintain the
stealth ... but we have an internal stealthy capability and then an external capability that can get
you a significant total amount of weapons," one company official said.
The Navy canceled its participation in the Air Force-led effort to develop an advanced tactical
fighter last year. In late April, the Air Force selected the team of Lockheed-General Dynamics-
Boeing to develop its YF-22 ATF prototype aircraft. The Lockheed team intends to offer a version of
the YF-22 as the basis of its bid on the AX.
A total of five industry teams or individual firms will be selected to enter AX Concept Exploration
Definition studies, which are estimated to be worth $20 million a piece. In addition to the
Lockheed proposal, three teams have announced they will compete for the development of the AX.
Lockheed will offer a new design with teammates Boeing and Grumman. General Dynamics and
McDonnell Douglas will submit a version of the now-defunct A-12. McDonnell Douglas and LTV will
team to offer a new design.
Don't want to go back through 6 pages of posts to find it, said something about the weapons bays being sized for "AGM-86E Standoff Attack Missiles"."it was a typo" where?
Nevermind, went back and dug it out on Page 3 of the thread.From flight global:Evil Flower said:How much bigger are the A/F-X bays compared to F-22? Width and lenghtwise they look about the same to me?
"Weapons-bay length was set by the dimensions of the AGM-86E stand-off land-attack missile, while width was determined by those of the GBU-24 laser-guided bomb. Air-to-air missiles would have been housed in F-22-style side bays."