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hopsalot

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Viewing 15 posts - 886 through 900 (of 2,738 total)
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  • in reply to: SAAB Gripen and Gripen NG thread #4 #2185743
    hopsalot
    Participant

    I am surprised nobody has commented on this — so basically the tiny, low-cost Gripen with inferior TWR, inferior agility, etc. is a real threat to the air superiority Typhoon due to the EW. With a combination of Meteor and IRIS-T* tiny Gripen C will be a formidable opponent also for a/c like Typhoon and Su-35… that makes me wonder what Gripen E will be!?

    *Typhoon has an unpleasant meeting with a Gripen with IRIS-T and HMD:

    Google translated from: https://blogg.forsvarsmakten.se/flygvapenbloggen/2014/06/06/verklighetsnara-taktikutveckling-av-jas-39-i-england-meatball-ur-en-pilots-perspektiv/

    What is there to say really? We just had a similar discussion about the Rafale and Spectra. EW systems are a marketer’s dream. You can vaguely attribute all kinds of amazing capabilities to one and never have to worry about anyone being able to make a direct comparison to any other system.

    The Gripen probably has a very capable EW system, just as all recent Western jets do. How does it compare to the others? Who knows?

    It is worth nothing that in exercises nobody is likely showing off the best they have got.

    in reply to: F-35 News and discussion (2016) take III #2186168
    hopsalot
    Participant

    To be honest i had the feeling that one of them had a bit too much Port, even the concept is strange, a self defense anti aam in a LO platform, what the…?!

    Yes, doubling the F-35’s loadout of internal missiles would be a real nice upgrade, but if they were only useful for shooting down enemy missiles what would be the point?

    in reply to: F-35 News and discussion (2016) take III #2186242
    hopsalot
    Participant

    A self defense aam with the primary mission of shooting down (in self defense) medium and long range radar guided missiles aimed at LO platforms…
    For Christ sake, no more Port for you mr St. John (either that, or the implications are trully stagering).

    And by the way, if this (bellow) is correct it kills the “BVR” CUDA thingy:

    I think someone, either the speaker or the author, is confused. These have previously been described as separate efforts and CUDA was described as having superior range to an AMRAAM. (something that would be totally unnecessary for a self defense missile)

    in reply to: F-35 News and discussion (2016) take III #2186246
    hopsalot
    Participant

    The range KPP´s for the JSF were designed based on three flight scenarios, a US Navy one for the “C”, a US Marine Corps for the “B” and a USAF one for the “A”.
    Of whats publicly available the USAF Flight Profile is composed of a 30K climb, then a 25K flight to the target, droping the weapons at 20K to 25 K and bugging out of there at the same altitude or in other words an entirely “HI-HI” flight profile (very similar to this http://i.imgur.com/Vqf2AwK.jpg, taken from LM presentation to Canada), not too far of what you describe has “at optimum cruise speed and altitude”. If anyone has better informations i would aprecciate, thanks in advance.

    Do you see the part that says “combat at 20k ft?” That is what I am referring to. The profile includes an allowance of fuel for combat in the target area. This is not a pure out and back flight. Additionally, if you look closely you will see that the profile calls for a period of “Opt M/Alt cruise” (220NM) right at the end of the flight. That establishes that most of the flight is not being conducted at its optimal altitude.

    in reply to: F-35 News and discussion (2016) take III #2186345
    hopsalot
    Participant

    Indeed F-16 in that config probably has a quite significant range — however keep in mind the figures quoted above from Sintra for the Rafale was without the CFT.

    Of course, no Rafale has CFT.

    This whole discussion started with me speculating around what range and loadout capabilities Rafale would get with CFT. Most likely it would be rather impressive. It also has 5 hardpoints to carry heavy stuff — more than other medium sized fighters.

    The Rafale would go a long way with CFTs, but the real value here is in freeing up hardpoints. A Rafale has 5 stations that can hold fuel or air to ground ordnance. If it flies with three tanks that leave two air to ground stations. (same as an F-16)

    What adding CFT would do is enable a Rafale to go farther with 4x heavy weapons.

    In general none of the numbers we are throwing out here are representative of how these aircraft would be flown in a real world scenario. Taking off, flying XXX NM at optimal cruise speed and altitude, dropping a couple bombs, and then flying straight home at optimum cruise speed and altitude only to land with minimum fuel reserves remaining… not such a hot plan for a combat mission.

    That is why the F-35 mission profile is so widely misunderstood. People see that ~600NM number and think it is directly comparable to the marketing numbers we are using here but the F-35 profile isn’t at optimum altitude and includes an allowance of fuel for combat in the mission area. (which explains why pilots actually flying the F-35 credit it with substantially longer range than the F-16 despite the apparent inconsistency with their advertised capabilities)

    in reply to: F-35 News and discussion (2016) take III #2186445
    hopsalot
    Participant

    Let’s put this to rest once and for all then. In a HI-HI profile, with three 2000L external’s, six 340 kg’s AASM, an LDP, four AAM’s the RAFALE will have a combat Radii of 750 NM, the end.

    Why on earth would you think that is “the end?”

    What would an F-16 do in the same profile? You just posted a slide showing an F-16 profile with only two drop tanks (+conformals) where it reached 630nmi in a hi-lo-lo-hi profile. Do you think that is directly comparable to a Rafale flying at high altitude the whole way with three tanks?

    edit:

    For example:

    The F-16I was developed on the basis of the F-16ES [Enhanced Strategic] single-seat and two-seat, long-range interdictor F-16 proposal. This configuraiton was developed in November 1993 in response to Israeli preference for the F-15I Eagle. The F-16ES featured additional fuel in one 1,136 liter (300 US gallon; 250 Imp gallon) centerline tank and two wing tanks, each 2,271 litre (600 US gallons; 500 Imp gallons), as well as two conformal tanks. The combat radius extended to in excess of 1,000 nautical miles (1,852 km; 1,151 miles).

    http://www.globalsecurity.org/military/world/israel/f-16i.htm

    The end?

    Of course not… there is too little detail to make a direct comparison.

    in reply to: F-35 News and discussion (2016) take III #2186539
    hopsalot
    Participant

    Only the navigational part of the LANTIRN system is internal though, consisting of a FLIR mounted on the nose and terrain following modes provided by the AN/APG-80 radar. The targeting system is still in a pod.

    https://img.planespotters.net/photo/102000/original/3016-dubai-air-force-lockheed-martin-f-16-block-60-viper_PlanespottersNet_102251.jpg

    As for drag, the Greek flight manual gives the same basic airframe drag with or without CFTs, sub- and supersonic – quite remarkable imho.

    Are we comparing against a Rafale with a targeting pod though? Again, the devil is in the details.

    in reply to: F-35 News and discussion (2016) take III #2186607
    hopsalot
    Participant

    When you compare the empty weight of the Rafale to the empty weight of the F16, don’t forget to add the 900 pounds of the F16’s CFTs 😉

    Add in a little drag & I doubt the F16 gets the same legs as the Rafale.

    Nic

    At cruise conditions the CFTs are essentially drag neutral.

    “The CFTs have very little adverse effect on the F-16’s renowned
    performance,” said Maj. Timothy S. McDonald, U.S. Air Force project pilot for
    CFT testing at Eglin. “You could hardly tell they were there. A set of CFTs
    carries 50 percent more fuel than the centerline external fuel tank, but has
    only 12 percent of the drag.”

    http://www.prnewswire.com/news-releases/lockheed-martin-and-us-air-force-complete-flight-testing-of-f-16-conformal-fuel-tanks-76984572.html

    in reply to: Canadian Fighter Replacement #2186612
    hopsalot
    Participant

    This whole thing is stupid, the Canadians should have bought F-16s or F-15s in the first place, now 35 years later they figured out their F-18s lack range so they want to replace them with F-16s, F-15s, or even more silly….more F-18’s. And you can’t tell me these F-18s have reached their service life because the USAF has F-15s that are older, have much more hours on the airframes, have been flown harder and are still in service and being upgraded for many more years in service. Where as Canadian F-18s don’t even all get used but are rotated through time in storage. And then you have eurocanards which are horribly expensive for no significant improvement, in fact the F-18 has a better thrust to weight ratio than the eurocanards. But if they want to spend money needlessly and get rid of perfectly fine fighters, well, why not.

    Really?

    You didn’t think to google before posting?

    in reply to: Norwegian Instructor Lies about F-35 BFM Performance #2186615
    hopsalot
    Participant

    I guess thats why some planes regularly hit 10.5/11 g in air shows…

    While hitting 10.5-11 g is possible… it strikes me as unlikely and a strange use of airframe fatigue life.

    Because the aircraft would have to be moving fairly fast just to achieve such a high g-load it wouldn’t necessarily look all that impressive from the ground and would leave awfully little margin for error.

    Also, putting that kind of strain on an airframe repeatedly (it would have to be done over and over again in practice to have any confidence it could be performed safely in public) would also wear the plane out quite rapidly.

    in reply to: F-35 News and discussion (2016) take III #2186651
    hopsalot
    Participant

    Edit: If my math is correct the Rafale carries 2.5% more fuel internally than F-16 internal + CFT

    Which given the F-16’s smaller size and engine would equate to an advantage for the F-16… not a huge one perhaps, but certainly it would be close to the Rafale.

    in reply to: F-35 News and discussion (2016) take III #2186652
    hopsalot
    Participant

    The basic number is ~3800 gallons of fuel (max internal and external) for the Gallic thingy at ten tons (clean) versus ~2800 gallons of fuel for the Viper (max internal and external) at between nine and ten tons (clean). (the numbers were taken from Dassault “Fox” publication, converted to gallons myself and LM specifications page)
    There are severall official combat radii diagrams out there, and while they are not exactly an Apples to Apples comparison they dont leave much doubt on the outcome.

    Cheers

    How many times do we have to go over the same thing? What is the Rafale’s range with the same profile?

    A marketing claim that says a Rafale can fly XXX miles without providing the details isn’t useful.

    The F-16 diagram above also includes a jamming pod and a LANTIRN pod, both of which are internal on an F-16 Block 60. (which would not only reduce drag, but would allow the F-16 to add a centerline fuel tank)

    in reply to: F-35 News and discussion (2016) take III #2187249
    hopsalot
    Participant

    http://www.defensenews.com/story/defense/international/mideast-africa/2016/03/14/yaalon-israel-defense-package-aid-iran-us-military-very-soon/81769578/

    Interesting that they are thinking about more F-15I — probably the F-35 range with full external loadout is not that great? And of course the F-15 can carry more than the F-35 (10,400 kg vs 8100kg). Interestingly the tiny Rafale can carry up to 9.500 kg, just between what the F-15 and F-35 can carry.

    Range and carrying capacity… just as I said in the Canada thread, a larger aircraft has an inherently greater capacity to carry large loads long distances. There is no Western fighter that can come close to an F-15E when it comes to delivering large bombs a long way.

    in reply to: Canadian Fighter Replacement #2187251
    hopsalot
    Participant

    F-35 convert twice the fuel, no way its lower IR signature

    Good, then it should have half the signature of a PAK FA, right?

    in reply to: Canadian Fighter Replacement #2187264
    hopsalot
    Participant

    Ginner, don’t take this the wrong way but do some legwork. This is open source information. Start with a LOAN nozzle, then look up aerodynamic heating at various speeds.

    The best way to look at the IR sig of the F-35 is that the US has stated many times that the focus of LO aircraft design is “balanced observables”- there have been various statements regarding this. In short, there is no point in designing a fighter to have reduced radar detection range and not to treat the IR spectrum. The US philosophy is that LO aircraft should be detectable in IR and EM at roughly the same distance. To that effect, the F-35 includes LOAN nozzle to cool and flatten the exhaust, hide the plume between the twin tails, extensive use of fuel as a heat sink, leading edge cooling, and so forth. Obviously, any aircraft in reheat, or moving at supersonic speeds is going to have a higher IR sig.

    … and these efforts are not just limited to RCS and IR. The F-35 incorporates a new generation of datalinks, a LPI radar, etc, to avoid/limit radio emissions as well. Being the stealthiest thing in the sky is always nice, but it is even nicer when you don’t have to fly blind because you can’t use your radar or datalink.

Viewing 15 posts - 886 through 900 (of 2,738 total)