I seem to recall that one of the critisisms against Gilmore was that he was always “behind”; e.g. that a report written 6-12 months ago would point to problems that had already been solved.
Have the problems mentioned in this November 28 memo also been solved already?
Articles keep calling Gilmore a “tester”, or sometimes “chief tester”. What does he actually test? He’s actually an oversight bureaucrat.
Of course recent articles like this one talk about the extra $530 million and possible delays needed to complete testing, and of course they always fail to mention that it’s paper pushers like Gilmore who cause the testing cost overruns and delays by always ordering more tests and saying current tests are inadequate.
I don’t know why articles like this rarely post the actual memo so that readers can look at what Gilmore actually said. It’s difficult to really determine the substance of his complaints when they’re put through a filter, with the journalist trying to rephrase pertinent comments and/or omitting important details. The details are important when evaluating the merit of his claims. This is doubly important when the article is reporting on Gilmore’s memo, but also is giving the F-35 program office an opportunity to respond. We simply don’t know what facts about the schedule the F-35 program used in their rebuttal — which may answer your question — because the journalist doesn’t provide it.
The article itself says that Gilmore mentioned that the F-35C has a wingtip structural issue, and both Gilmore and Kelley (Navy) said the fix is already implemented. Gilmore tries to emphasize that the problem has been around for a long time (i.e. since 2013) like that’s a bad thing but back then the F-35 program was concentrating on internal weapons carriage, not external. So the reason why the fix is being implemented now is just that there were other more pressing problems and it’s now that the program is fixing issues with external carriage. So it seems like that one has already been addressed (assuming the implementation is tested to be successful). It’s hard to know about the schedule; IIRC, I remember reading a while back that the the schedule will likely slip, however, the new projected schedule won’t hit the threshold date for being late. It’s just that it’s slipping from the objective date. Until it’s projected to go past the threshold date, Gilmore whining about the schedule is just more FUD. (I will say though that the difference between the objective (i.e. goal) and the threshold (i.e. deadline) is basically the buffer or margin or slack built into the schedule, so if that buffer decreases, then there’s less room for unanticipated problems, so it *is* a concern. But AFAIK they’re not projecting the schedule to go past the threshold date yet — Gilmore is basically whining that the buffer is now less than it was before.)
er, he was speaking about the F-35, read again
No, the Raptor. Read my previous post carefully.
The only logical thread allowing Obligatory to pull in the other quote and claim that the F-35 needs to engage min afterburner to sustain a speed above Mach 1.0 is that “without using fuel-gulping afterburners” is not a rhetorical detail to help the reader understand the significance, but that it is saying the F-35 needs a bit of afterburner (i.e. more efficient than full afterburner and hence not “fuel-gulping”). Otherwise, the other quote simply doesn’t matter. I pointed out that the similar phrase “without using fuel-guzzling afterburners” has been used to describe the Raptor’s supercruise hundreds of times. Therefore, to be logically consistent, if this phrase refers to min afterburner for the F-35, then it refers to min afterburner for the Raptor as well. The alternative is to recognize that the phrase was indeed just for the benefit of the reader, not a technical detail, and neither aircraft needs to engage their afterburners to sustain a speed above Mach 1.0. It’s either both or neither.
and that technically very very minimum afterburner is what the 2nd pilot refer to with the disclaimer it aint SC in a technical sense but it also isnt full fuelgulping afterburner
So your position is that the F-22 Raptor needs a very very minimum afterburner to do its supercruise at > Mach 1.5. Noted. Glad we got that cleared up, since you seem to raise this issue every so often.
i dont know why you bring up nonsense, everyone, as in L.M & pilots, has stated that F-35 does not fly supersonic in level flight without afterburner, , except one pilot that brought in a disclaimer as to not get caught red handed.
why would you pick the disclaimer version over all others ?
Sigh. If you want to embarrass yourself, then fine.
1. It’s easy to show that some in the aviation industry, Lockheed Martin in particular, hold “supercruise” to mean more than just supersonic (> Mach 1.0), but Mach 1.5 or higher. For example:
https://www.flightglobal.com/news/articles/f-22-fights-back-with-supercruise-success-54326/
Five days later the F-22 test aircraft, 4001, demonstrated supercruise capability, or sustained speeds of more than Mach 1.5 without afterburner, in tests at Edwards AFB, California, and this key milestone was seized upon by the USAF as an opportunity to rally support for the air superiority fighter.
Lockheed Martin’s Code One Magazine article written by Paul Metz: http://www.codeonemagazine.com/images/C1_2000_V15N04_1271449318_6844.pdf (page 14)
Supercruise, or the ability to travel at high supersonic speeds without afterburner, is one trick in a bag of tricks offered by the F-22.
Note that this is Paul Metz giving this definition.
Lockheed Martin’s Code One Magazine article: http://www.codeonemagazine.com/images/C1_Vol20_No4_1271449318_1059.pdf (page 12)
Among all fighters — current as well as future, including the F-35 — the F/A-22’s ability to supercruise (fly at greater than Mach 1.5 without the use of afterburner) adds to the kinetic energy imparted to its missiles at launch while simultaneously denying the enemy time in which to respond.
Granted, that definition has fallen out of favor, as anyone and everybody has now started calling their fighters “supercruising” if they could sustain Mach 1.1-1.2 without afterburners. Granted, setting the bar of Mach 1.5 was an arbitrary number anyway; it was just because that’s the bar the F-22 was supposed to beat as its KPP, as shown in its SAR, and one that Lockheed hoped other fighter manufacturers wouldn’t be able to achieve. Note that these citations are purposely taken from a long time ago, i.e. to show that they are not recent citations to try to “reinvent the past” on supercruise definitions regarding the more recent F-35 quote.
2. That there is this difference in “supercruise” definitions (“any supersonic speed” versus “> Mach 1.5”), particularly by Lockheed Martin versus the rest of the major fighter manufacturers, has been acknowledged for a long time, even on this forum. For example:
http://forum.keypublishing.com/showthread.php?12423-does-the-f-35-have-supercruise-capability (from 2003)
http://forum.keypublishing.com/showthread.php?48193-Exact-definition-of-supercruise (from 2005)
3. The quote in question about whether or not the F-35 supercruises was from Lockheed Martin’s Vice President Stephen O’Bryan, being quoted in the Air Force Magazine (Nov 2012):
http://www.airforcemag.com/MagazineArchive/Documents/2012/November%202012/1112fighter.pdf
http://www.airforcemag.com/MagazineArchive/Pages/2012/November%202012/1112fighter.aspx (text version)
The F-35, while not technically a “supercruising” aircraft, can maintain Mach 1.2 for a dash of 150 miles without using fuel-gulping afterburners.
“Mach 1.2 is a good speed for you, according to the pilots,” O’Bryan said.
The high speed also allows the F-35 to impart more energy to a weapon such as a bomb or missile, meaning the aircraft will be able to “throw” such munitions farther than they could go on their own energy alone.
There is a major extension of the fighter’s range if speed is kept around Mach .9, O’Bryan went on, but he asserted that F-35 transonic performance is exceptional and goes “through the [Mach 1] number fairly easily.” The transonic area is “where you really operate.”
It’s easy to see that this is because O’Bryan, being from Lockheed Martin, holds sustained supersonic speeds above Mach 1.5 without afterburners as the technical definition of supercruise. Hence the “while not technically” since the F-35 only sustains Mach 1.2.
4. Obligatory has repeatedly claimed ad nauseum that “without using fuel-gulping afterburners” means that the F-35 has to use the more fuel-efficient partial afterburners (or to occasionally “tap” the afterburners) on this forum. Hence that this is why Lockheed Martin says it doesn’t really supercruise (note that the definition here has changed — now “supercruise” simply refers to “any speed above Mach 1.0” compared with Lockheed Martin’s definition of “> Mach 1.5”). This is because modern afterburners have stages, so you can activate the afterburner in levels, rather than older afterburners which were “all or nothing”. See for example the most recent in the F-35 thread from June 2016:
http://forum.keypublishing.com/showthread.php?137788-F-35-News-and-discussion-(2016)-take-III&p=2319539#post2319539 (claiming it was just “some kid” who came up with the Mach 1.5 explanation — now we know that Obligatory considers Paul Metz “some kid”)
http://forum.keypublishing.com/showthread.php?137788-F-35-News-and-discussion-(2016)-take-III&p=2319755#post2319755 (claiming the 150 miles is because the F-35 starts at max altitude and has to do a shallow dive for the whole distance to stay supersonic)
This despite people telling him over and over again that he’s misinterpreting the quote, and that he’s conflating Lockheed Martin’s definition of “> Mach 1.5” with the more common definition of “any supersonic speed” as why LM says the F-35 doesn’t supercruise.
5. Any ordinary non-Obligatory interpretation of the quote is obvious: the writer is simply telling the reader the significance of this to orient the reader, namely that the airplane does not have to use afterburners, which consume a lot of fuel, thus the plane can save a lot of fuel. It is easy enough to google the phrase “without using fuel-guzzling afterburners” to see that there are hundreds of articles about supercruising without using fuel-guzzling afterburners…about the F-22. So, under Obligatory’s interpretation, the F-22 also has to either use the min afterburner or occasionally tap the afterburner in order to reach its Mach 1.7 “supercruise” or whatever speed it can reach.
So this is really a pretty simple choice for Obligatory:
1. Either your interpretation is correct, and the Raptor actually has to use min afterburner or occasionally tap them to sustain its supercruise of > Mach 1.5, or
2. Your interpretation is incorrect, the F-35 does not need to use afterburner to maintain > Mach 1.0 in level flight (for 150 miles), and the writer is simply providing a rhetorical detail to help the reader, or
3. There is a semantic difference between the “fuel-gulping afterburners” that the F-35 is described to not need, and the “fuel-guzzling afterburners” that the F-22 is described to not need.
So which is it?
Rafale is much bigger than Gripen E, and furthermore Rafale is one of the (Western) fighters with the most impressive range/payload specs out there.
However the impressiveness of Rafale should not diminish the impressiveness of Gripen E! Which is, after all, in a lighter weight class. It is a bit like in boxing; there is a reason why there are different weight classes in boxing, and comparing a boxer in a light weight class with a boxer in a higher weight class is very tricky (and may even reflect poorly on the person doing the comparison, unless done carefully….)
Yeah I think it’s important to keep things in perspective though. The Gripen E is a light fighter. So sure, it can have a big range. But it can only do so by putting roughly 90% of its payload capacity into extra fuel. Whereas all the other aircraft can go that far while carrying thousands of pounds of weapons. There’s a reason why they’re heavier than the Gripen.
How much does 6 AAMs weigh?
A Sidewinder weighs 188 lb according to Wikipedia. An AMRAAM weighs 335 lb. Then you add a hundred pounds or two for the pylon and launcher. The Gripen E only has a thousand pounds or two left over before its MTOW after accounting for the fuel tanks. So it’s going to be pretty close to MTOW. On the other hand, the figures being quotes are for maximum ranges. That means that yes you do load up on as much fuel as you possibly can and just put in some token weapons. For most fighters, loading up on fuel tanks does not use up as much payload (percentage-wise) as the Gripen E — only the Gripen E gets to use so much of its payload on external fuel. That’s why it has so little left for anything else when it’s going for max range. Another way to think of it is that the Gripen E can go farther than it “should” because it can put so much of its payload into external fuel — the tradeoff being that it can’t hold much else when it does so.
If the Gripen E can do a mission with 1,300 km radius with 30 minutes on-station I think that is pretty impressive for such a tiny bird.
Not sure if it’s actually be all that surprising. It gives the Gripen E a fuel fraction of around 0.43 by using up most of the available payload, leaving just enough for 4 missiles (and a recce pod if desired), putting it at its MTOW. It’s almost like the Rafale carrying 3 2000 L tanks, except the Rafale can still carry thousands of pounds of weapons still.
for instance, a pilot claiming ‘f-35 can maintain mach 1.2 for 150 miles albeit not supercruise in a technical sense without ‘fuelgulping’ afterburners, while a previous pilot just stated the month before it only took ‘a little bit a/b to stay supersonic,
then the logical conclusion is, the 150 miles @ M1.2 is true, the ‘without fuelgulping a/b’ refer to ‘just a teeny weeny bit a/b’
-ergo ‘not supercruise in a technical sense’
I don’t know why you keep bringing this up. Everyone’s already been telling you that it’s a nonsensical interpretation of the wording, the author was just adding the adjective for the benefit of the reader (i.e. because it readily conveys the importance of not having to use afterburners — because they burn a lot of fuel).
Or I guess the next time someone says “nobody should buy the Typhoon, it’s too expensive, countries should buy the cheaper Gripens instead” maybe I should respond with “yeah but Typhoons are still cheaper than the other not-so-cheap Gripens, did you ever think about that?”
Pretty sure the two tanks on the belly idea was shelved.
I’m guessing it would exceed the MTOW anyway.
http://www.defenseindustrydaily.com/images/AIR_JAS-39N_Concept_Water_lg.jpg[ATTACH=CONFIG]249989[/ATTACH]
:O If it’s carrying 4 external fuel tanks how does it have any payload capacity left to carry weapons?
Regardless, though, the Saab brochure’s weapon systems page lists it as being able to carry only 3 external fuel tanks, so that’s probably the configuration that is available now for the Gripen NG.
And with 4 BVR and 2 WVR missiles, it could be a problem of using 3 tanks. Since 2 BVR needs to be next to centre tank. In fact its hard to find an image were Gripen has 3 tanks with weapons. Its always 2 tanks for NG.
Where does it say it was with 4 BVR and 2 WVR missiles?
Edit: Regarding images of the NG with tanks, the snark in me wants to say “that’s because it hasn’t flown yet”. But it’s really because Saab knows how unattractive it’d be to computer-generate an image of their max range configuration, i.e. all loaded up with fuel tanks leaving only the wingtip and outboard pylons for weapons. So they don’t. And guess what, the configurations they do generate are not going to reach the max ranges they talk about.
Full internal, not full external. Full external isnt the standard A2A config.
The Saab brochure says “maximum combat radius” not “standard A2A config” for the “approximately 800 nm”. “Maximum” implies carrying every fuel tank available. (It also implies carrying the minimum number of weapons possible to still count, but I guess we can ignore that.) It even gives the “actual mileage may vary” disclaimer by saying the actual combat radius depends on the aircraft configuration, which implies that the operational combat radius will be somewhat less than this.
optimal alt for F-35 is ~27k
Hanche (F-35 pilot) has said that the F-35 cruises 10000-15000 feet higher and 50-80 knots faster than the F-16 (link has google translate). So if you get your aviation information from F-35 pilots and Obligatory, the F-16’s optimum cruise altitude is 12000-17000 feet.
Time on station is also a somewhat meaningless metric as we don’t know how that time is calculated. Is the aircraft racetracking, is it trading altitude for longer on station time, it is in a very low energy state and would take time to reach a tactically significant speed?
In these situations where the profile isn’t given, and especially since the brochure is talking about maximums and “your mileage may vary” depending on actual use conditions, it’s probably best to assume that it was an optimum cruise profile to/from the target area, and optimum endurance profile when loitering.
8,000kg empty weight
7,000kg of fuel
+weapons
16,500kg maximum takeoff weight.They are proposing operating the jet just below its maximum takeoff weight for a “combat air patrol.”
Additionally, typically the weight of the fuel tank and pylon is roughly 15-20% of the weight of the fuel. I don’t know what fuel tanks/pylons they’re using for the Gripen NG, but if it holds 3600 kg of external fuel then this is about 540 kg to 720 kg of pylon/fuel tank weight for that fuel. So you’re looking at:
8000 kg empty weight
3400 kg internal fuel
3600 kg external fuel
540 kg to 720 kg pylon/fuel tank weight
———-
15540 to 15720 kg used
With a MTOW of 16500 kg, you’re looking at a weapons payload of 780 kg to 960 kg or so max, or roughly 2000 lb of total ordnance. This also includes any potential self-defense missiles if they’re carried, plus the weight of the outboard wing pylons (I assume wingtip pylons are part of the empty weight) needed to hold the air-to-surface weapons. This is probably why Saab had the disclaimer “The actual combat radius depends on the configuration of the aircraft’s external stores, its profiles and the availability of reserve fuel tanks” — basically that if you want to drop anything more than a couple of 500-lb bombs the radius will decrease. Usually the available payload is so large that you may not care to include the weight of the pylons and fuel tanks, but in this case the remaining available payload capacity is so small that they make a sizable difference.
Edit: Just a follow-up point, this is what makes the payload figures somewhat deceptive. Sure, the Rafale can carry more (21,000 lb) than the F-35 (18,000 lb), but in order to match the F-35’s range it’s going to be using multiple external fuel tanks, which cuts into that payload. In this case, the Gripen NG has roughly 2000 lb left for missiles and bombs (and pylons), while the F-35 is carrying ~5000 lb of ordnance internally. The F-35, however, has an additional 13,000 lb of external payload capacity should the operator wish to trade off between capacity and range, or simply carry more per mission (thus needing fewer planes). The Gripen NG is completely tapped out. Same goes for the other planes (Rafale, Typhoon, Super Hornet).
The whole idea is ludicrous. (though perhaps slightly less so than suggesting the F-106…) The Gripen is fundamentally unsuitable for Canada’s requirements. It is a tiny jet with literally half the thrust of an original Hornet, itself not a particularly large plane. It simply isn’t a design that lends itself to long-range operation and it isn’t capable of carrying a large radar that would be useful when performing long-range intercepts or cruise missile defense. There is also zero economic case for participation in the Gripen program because the plane is being produced only in tiny numbers. The entire Gripen E order book is only ~100 planes.
To what extent is a large radar necessary for a long-range intercept? I mean, it’s not as if Canada is having its planes patrol the borders 24/7 waiting for something to happen. No, it’s more likely that the EW system picks up something interesting and then the plane is scrambled to intercept it. In that case reaction time (how long it takes to prep the plane for takeoff) is going to be more important.
And the economic case for participation in the Gripen program is that Canada would be a big customer. It could probably help build quite a bit of them too.
That graphic looks dodgy, it seems like it’s just distorting things to make the paper F-15SE look good. For example for the F-15SE it’s almost certainly including the fuel carried in its CFTs to reach that payload. The Typhoon is already mentioned as having a higher service ceiling than given. And for the radius of operation, both the Typhoon and F-15SE are assumed to be in air-to-air, while the F-35’s radius is given for an air-to-ground mission, which is smaller. So basically, it’s not so much the facts are inaccurate, it’s that it’s put together incorrectly to give a misleading view.
If Canada were to go for a non-F-35 aircraft that emphasized capability as a long-ranged interceptor/cruise missile defense platform the F-15E is essentially impossible to beat. There is no other Western fighter that has a similarly sized radar, range/endurance, or carrying capacity. The latest versions also have modern IRSTS and brand new EW systems. (Either the brand new system developed for the Saudi and Qatari F-15s or Canada could hypothetically buy the new GaN EW system the US is developing for its own F-15s.)
What about the Rafale? I thought the Rafale has greater payload as well as greater range than the F-35. Not sure if it’s up to the F-15E though.
so why would f-18 be an option but f-16 isnt ?
IIRC Lockheed Martin also makes the F-16, so they’re not going to offer it as a direct competitor to their F-35.