F-35 high AoA testing and other good stuff

Discuss the F-35 Lightning II
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popcorn

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Unread post31 Aug 2012, 00:29

Nice report.. no editorializing.

http://www.flightglobal.com/news/articl ... fb-375964/

F-35 high AOA flights and weapons separation tests imminent at Edwards AFB

Test pilots at Edwards AFB, California, are set to begin high angle-of-attack (AOA) flights and weapons separation testing on the Lockheed Martin F-35 Joint Strike Fighter (JSF).

So far this year, pilots at the isolated desert base have flown about 9 sorties, says Lt Col George Schwartz, director of the F-35 integrated test force and commander of the 461st Flight Test Squadron. Much of the activity has focused on high speed tests which have seen the F-35 being repeatedly pushed out to its maximum speed of Mach 1.6 and 700 knots calibrated airspeed-often fully laden with internal weapons.

Another ongoing theme for the Edwards test pilots is maturity testing for the software required for the F-35 training mission currently underway at Eglin AFB, Florida. The test pilots at the base have also flown night aerial refueling missions and have completed all of the engine air starts required for the F-35A conventional take-off and landing variant (CTOL).

For the engine air start tests, the F-35 needed some modifications, one of which was the addition of a second cockpit pressurization system. The added pressurization system was necessary because the tests involved shutting down the jet's engine at high altitude. "We finished that up with two engine restarts at 40,000ft and 37,500ft," Schwartz says.

Though the air start sorties were challenging in a single-engine fighter, the testing was necessary in order to move onto exploring particularly difficult parts of the jet's flight envelope. "That allowed us to go into high AOA testing where we will start expanding the envelope from 20° AOA all the way up to 50° AOA," Schwartz says. "It's going to start probably in September."

Right now, engineers are in the final stages of attaching an anti-spin parachute to aircraft AF-4. "We've finished almost everything for that," Schwartz says. The next step will be to test deploying the chute during runway taxi trials in order to make sure it works properly.

Initially, test pilots will simply push the F-35 out to 50° AOA. But then the veteran aviators will have to intentionally depart the aircraft from controlled flight in order to gauge how the jet behaves under those conditions. They will also evaluate the F-35's departure recovery procedures and its departure resistance characteristics. "It's the kind of stuff a test pilot dreams of doing," Schwartz says.

Like the transonic region of the flight envelope, high AOA testing flight is particularly tricky. While there have been improvements made, there are still some transonic roll-off problems--where the aircraft begins an uncommanded roll at speeds between Mach 0.9 and Mach 1.2--that have yet to be fully ironed out on the F-35. Those problems are being fixed with tweaks to the F-35's flight control laws. But Sch wartz says, similar discoveries are possible in other challenging parts of the envelope like high AOA flight. "We expect to find stuff and we'll get it corrected," Schwartz says. "That's why we're here..."

--- more at the link...
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neptune

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Unread post31 Aug 2012, 00:59

OMG! Ha! They had the audacity to mention the "dreaded trans-sonic roll-off", now the trolls will be out for sure! :) Sadly trolls can't read where it's being fixed by software, only! ....nice report
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Unread post31 Aug 2012, 01:54

Hopefully some nice video footage soon to silence the peanut gallery. Kopp couldn't have been more wrong about the F-35's stealth and its RCS threat angles, lets see if Goon fails as badly with his favoured subject matter too.
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Unread post31 Aug 2012, 02:04

I thought we had it on good authority from a certain poster here that the F-35 can't do high AoA...
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count_to_10

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Unread post31 Aug 2012, 02:13

It's really too bad (from the perspective of spectacular visuals) that the F-35 is designed specifically to be lethal without really "working hard".
It's hard to dynamically show something casually servicing all comers.
Einstein got it backward: one cannot prevent a war without preparing for it.
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Unread post31 Aug 2012, 02:27

Not sure if 'Majumdar' has this quote in the above report but at the DEWline there is this little nibble:

Edwards AFB about to start F-35 high AOA test and weapons separation trials
By Dave Majumdar August 31, 2012

http://www.flightglobal.com/blogs/the-d ... t-f-3.html

"...Interestingly, while it's not remotely close to being as fast as its older F-22 sibling, the guys at Edwards have been routinely taking the F-35 up to its max speed of Mach 1.6 with internal payloads." Jet pilots - going fast - who'da thunk. :D
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m

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Unread post31 Aug 2012, 10:18

Nice article

Someone knows more when the first anti spin parachutes were used?

GQ Parachute Co Ltd.: In the late 1940s to the early 1960s the company was involved in the design, development and manufacture of the first generation of brake and anti-spin parachutes for aircraft.
http://www.exploringsurreyspast.org.uk/ ... SHCOL_7143
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popcorn

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Unread post31 Aug 2012, 11:04

spazsinbad wrote:Not sure if 'Majumdar' has this quote in the above report but at the DEWline there is this little nibble:

Edwards AFB about to start F-35 high AOA test and weapons separation trials
By Dave Majumdar August 31, 2012

http://www.flightglobal.com/blogs/the-d ... t-f-3.html

"...Interestingly, while it's not remotely close to being as fast as its older F-22 sibling, the guys at Edwards have been routinely taking the F-35 up to its max speed of Mach 1.6 with internal payloads." Jet pilots - going fast - who'da thunk. :D


Yup, it's there.." Much of the activity has focused on high speed tests which have seen the F-35 being repeatedly pushed out to its maximum speed of Mach 1.6 and 700 knots calibrated airspeed-often fully laden with internal weapons.".
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popcorn

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Unread post31 Aug 2012, 11:06

..
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Unread post31 Aug 2012, 11:18

'popcorn' perhaps my humour is too SUBtle SOMEtimes but anyway this is the 'little nibble' (dig - dis) of the F-35 in an otherwise examplary NOT onesided AvWeak article: "...while it's not remotely close to being as fast as its older F-22 sibling..." :D I'm not allowed to alter article headlines or DIS (disrespect) their authors. Somehow this does not apply to others on this forum but anyway I need a FIRM HAND (applause will do). :D
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Unread post23 Oct 2012, 22:04

8) Image

Lockheed Martin test pilot David Nelson is at the controls of F-35A test aircraft AF-4 for the first ground deployment test of the spin recovery parachute on 20 October 2012. The test took place on Runway 22 at the Air Force Test Center at Edwards AFB, California. The spin recovery system is a safety device required for upcoming high angle of attack flight tests.
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Unread post23 Oct 2012, 22:19

Thanks. Zoom view from original photo here: http://www.codeonemagazine.com/images/n ... 4_9489.jpg
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F-35AantiSpinDevice.jpg
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Unread post23 Oct 2012, 23:58

The Lockheed Martin F-35B short take-off and vertical landing (STOVL) variant of the Joint Strike Fighter (JSF) has completed a series of engine air start tests, which involve shutting down and restarting the jet's Pratt & Whitney F135 turbofan in flight.

Aircraft BF-2 successfully completed a series of 27 air starts at various altitudes and using various methods on 15 August at Edwards AFB, California, according to the US Naval Air Systems Command.

"The aircraft and its integrated systems demonstrated intentional flameout and successful recovery scenarios during air start flight tests, and BF-2 and the team did a great job," says Roy Hauck, P&W's site lead at the F-35 Patuxent River integrated test force in Maryland.

Air start testing is required for the F-35B to undertake high angle-of-attack trials next year. The US Air Force's F-35A variant had earlier completed its air start testing at Edwards AFB.

"High alpha, or angle-of-attack tests, are important for us to fully evaluate the aircraft's handling characteristics and warfighting capability," says US Marine Corps test pilot Lt Col Matthew Kelly. "Maximising the performance of the airplane around the very slow edges of the flight envelope is probably some of the most challenging testing we will conduct. After we get through it, we'll know a lot more about how this aircraft will perform during combat within visual range."

Though normally flown at NAS Patuxent River, the US Navy deployed the F-35B and a Boeing F/A-18 Hornet chase aircraft to take advantage of Edwards' massive dry lake bed, which makes for an ideal landing strip in case of emergency.

https://www.flightglobal.com/news/artic ... fb-376071/
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Unread post24 Oct 2012, 00:34

Some of your posts 'f-22lm' have been posted already. Perhaps looking at thread titles / and / or dates of posts will help you find relevant topics or use the search engine for this forum specifically for the F-35. Otherwise it is good to see you keen to find relevant material.
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Unread post31 Oct 2012, 19:01

F-35A Spin Recovery Chute Test VIDEO

http://www.youtube.com/watch?feature=pl ... BxaDkXHzKY

"Published on Oct 31, 2012 by LockheedMartinVideos
Lockheed Martin test pilot Dave Nelson discusses the importance of installing a spin chute and testing it on the ground prior to beginning high angle of attack flight tests."
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F-35spinChuteDeployedScreenie.jpg
RAN FAA A4G: http://tinyurl.com/ctfwb3t http://tinyurl.com/ccmlenr http://www.youtube.com/user/bengello/videos
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