F-35 Joint Strike Fighter News, Videos and pics Thread

Discussion in 'World Armed Forces' started by Jeff Head, Dec 1, 2011.

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Brumby Major

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Anlsvrthng said: ↑

RAM important on the air intakes, the edge treatment is the second most important.
Tertiary important is the general painting : P

There you go again with your obfuscation and off tangent replies.

According to the special AWST edition on “the state of stealth”, it basically affirms what is generally known on RCS reduction. RCS reduction is 90 % shaping and 10 % RAM. Engine contributes to 60 % of RCS issue. If you have no appropriate shaping and no engine blocker you basically have cow droppings.

Unless RAM is integrated into a radar-absorbing structure, the material adds weight and volume without aiding structural integrity. Stealth design has therefore dictated using shaping to control the largest contributor to RCS, specular reflections. The first true stealth aircraft, the F-117, employed a fully faceted shape to control these and saved RAM largely to deal with cavities and surface waves. (page 12)

The next stealth aircraft, Northrop Grumman’s B-2, was said to rely more on shape and less on RAM than the F-117. (page 13)

To suppress engine returns, the B-2 used a serpentine duct lined with RAM. Both shape and material are vital to this RCS reduction technique. The RAM is thin, but the inlet’s curve causes waves to bounce so many times the absorption adds up. Compared to a notional straight duct, an untreated serpentine inlet might achieve a reduction of 30 dB at boresight, but the advantage is zero outside 5 deg. off centerline. Add RAM, and RCS drops another 30 dB at boresight and stays 30-40 dB below unlined ducts, straight or curved, past 10 deg. (page 14)

#7271 Brumby, Nov 17, 2019

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Switching gear back to the F-35. A couple of pictures on the F-35 display cockpit.

Inside the F-35 cockpit. The display screen is configurable by the pilot.

#7272 Brumby, Nov 17, 2019

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Jura General

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the US had almost a half of million KIA during WW2, so I'll now protest against

#7268 Anlsvrthng, Yesterday at 9:31 PM

reporting (later I may edit it in Report Window) flamebaity suggestion of the US making profit out of WW2

first I finish here: I'm sometimes critical about the Pentagon and certain military projects including the F-35, but #7268 Anlsvrthng, Yesterday at 9:31 PM
is trolling with a scandalous reference to the US involvement in WW2
EDIT reported that outrage

#7273 Jura, Nov 17, 2019
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Brumby said: ↑

View attachment 55250

briefly compared to about one dozen pictures in Internet, and the view of the joystick appears to be new (they covered it in older pictures)

what's the source anyway?

#7274 Jura, Nov 17, 2019

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"The military’s open-air test ranges lack the capacity to fully test the F-35’s advanced capabilities, so the Director of Operational Test and Evaluation (DOT&E) office is relying on the activation of the Joint Simulation Environment (JSE)." etc.
inside (dated Nov 13, 2019)
Ongoing Legal Dispute Caused 2.5-Year F-35 System Delay https://aviationweek.com/defense/ongoing-legal-dispute-caused-25-year-f-35-system-delay
:

An ongoing legal dispute between the U.S. government and Lockheed Martin over intellectual property rights has emerged as the source of a 2.5-year-long delay in activating a key F-35 system required to complete initial operational testing and make a full-rate production decision, according to Lt. Gen. Eric Fick, the F-35 program executive officer.

The military’s open-air test ranges lack the capacity to fully test the F-35’s advanced capabilities, so the Director of Operational Test and Evaluation (DOT&E) office is relying on the activation of the Joint Simulation Environment (JSE).

The JSE creates a synthetic world that allows operational testers to gauge the F-35’s performance in theater-level scenarios, with multiple aircraft flying against an adversary’s full arsenal of fighters, missiles and electronic warfare capabilities.

The JSE was supposed to be activated in late 2017, but is currently scheduled to achieve that milestone in July 2020, Robert Behler, the head of the DOT&E, told lawmakers Nov. 13 during a hearing on F-35 readiness.

DOT&E has completed 91% of open air missions during the Initial Operational Test & Evaluation phase (IOT&E) required to qualify the F-35 for a full-rate production decision, but the testers still need to use the JSE to complete all of the testing.

Fick acknowledged two weeks ago that an intellectual property dispute had delayed the activation of the JSE, but added more details about the dispute in his testimony to the House Armed Services subcommittee on readiness.

The JSE requires Lockheed to supply the software to enable a function called “F-35 In a Box,” Fick says. This is a software module that allows the JSE to virtually replicate each of the F-35’s sensor subsystems, along with the sensor fusion function embedded in the operational flight program. The government then would add software modules to replicate various threats, including aircraft, weapons and sensors of various adversaries.

But a dispute arose because Lockheed asserted an intellectual property claim over nine specific algorithms that were included in the F-35 In a Box software package, Fick says.

The government responded by bringing in the Defense Contracts Audit Agency (DCAA) to review Lockheed’s records, Fick says. The DCAA’s auditors determined they could not find the proof in Lockheed’s records that the nine algorithms had been developed solely at Lockheed’s expense, Fick says. Since Lockheed failed to prove its claim, the DCAA determined the nine algorithms belonged to the government.

Lockheed has appealed the DCAA’s decision to the Armed Services Board of Contract Appeals, which is still being adjudicated, Fick says.

The dispute over JSE feeds into a larger source of tension between the government and contractors over intellectual property rights. Ellen Lord, assistant secretary of defense for acquisition and sustainment, testified at the same hearing that her office is in the final stages of approving a new, department-wide policy on preserving the government’s rights to intellectual property in acquisition contracts. The policy will be modeled on an approach now adopted by the U.S. Army that requires program managers to establish the government’s intellectual property rights on specific systems up front, rather than treat the issue as an afterthought, she says.

But the new policy still faces doubts by industry lobbying groups, including the Aerospace Industries Association.

John Luddy, the AIA’s vice president for national security policy, said intellectual property policymaking is “probably the most important” issue between his trade lobby group and defense leaders currently.

Industry is not yet behind the emerging Pentagon policy, he indicated during the Comdef 2019 conference in October, because it does not strike the proper “balance” in industry’s mind to allow it to reap profits while letting the government contract to sustain weapon systems more affordably.

“We think [it] is headed toward the right kind of balance but I would just encourage that to continue. We’re engaged quite a bit with the department on that,” Luddy said. “We have to find that balance.”

#7275 Jura, Nov 17, 2019

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Jura said: ↑

briefly compared to about one dozen pictures in Internet, and the view of the joystick appears to be new (they covered it in older pictures)

what's the source anyway?

Taken from a book on the F-35.

Jura said: ↑

"The military’s open-air test ranges lack the capacity to fully test the F-35’s advanced capabilities, so the Director of Operational Test and Evaluation (DOT&E) office is relying on the activation of the Joint Simulation Environment (JSE)." etc.
inside (dated Nov 13, 2019)
Ongoing Legal Dispute Caused 2.5-Year F-35 System Delay https://aviationweek.com/defense/ongoing-legal-dispute-caused-25-year-f-35-system-delay
:

It is a requirement probably only unique to the US. The rule is they are to test its capabilities against future threats that do not exist as of today. It is not easy to simulate a future threat that can actually be tested realistically at a practical level. That is the reason why they have to use JSE.

#7276 Brumby, Nov 17, 2019

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Brumby said: ↑

...

It is a requirement probably only unique to the US. The rule is they are to test its capabilities against future threats that do not exist as of today. It is not easy to simulate a future threat that can actually be tested realistically at a practical level. That is the reason why they have to use JSE.

I would've thought "open-air test ranges" Today at 10:45 AM

Jura said: ↑

"The military’s open-air test ranges lack the capacity to fully test the F-35’s advanced capabilities, so the Director of Operational Test and Evaluation (DOT&E) office is relying on the activation of the Joint Simulation Environment (JSE)." etc.
inside (dated Nov 13, 2019)
Ongoing Legal Dispute Caused 2.5-Year F-35 System Delay https://aviationweek.com/defense/ongoing-legal-dispute-caused-25-year-f-35-system-delay
:

had been big enough in the US, but who knows what's going on

#7277 Jura, Nov 17, 2019
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Brumby said: ↑

There you go again with your obfuscation and off tangent replies.

According to the special AWST edition on “the state of stealth”, it basically affirms what is generally known on RCS reduction. RCS reduction is 90 % shaping and 10 % RAM. Engine contributes to 60 % of RCS issue. If you have no appropriate shaping and no engine blocker you basically have cow droppings.

The simplest solution to decide who right is to get a copy of F-35 and Su-34, and with X band radars compare them to each other.

Easy, isn't it?

Otherwise all that we have is the data from the procurement strategy of different countries. (follow the money )

The clever comments of everyone from high school textbooks doesn't prove / falsify anything.

#7278 Anlsvrthng, Nov 17, 2019
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into the Report Window will go:

thank you for removing a horrendous claim the account 'Anlsvrthng' had made earlier and I reported;
now I point to your attention the account 'Anlsvrthng' keeps trying to derail
F-35 Joint Strike Fighter News, Videos and pics Thread

#7279 Jura, Nov 17, 2019

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Stay on topic please.

#7280 siegecrossbow, Nov 17, 2019

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