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Tu22m

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  • in reply to: F-35 News thread. Part Deux #2285954
    Tu22m
    Participant

    OK, I’ll try it differently:
    -you fly with EFTs, which gives you an combat radius of ~ 715 Nmiles, but it takes you longer to arrive “on station” compared to a clean F 35;
    -you fly with one EFT and 4-6 AAMs at 1.2M in SC, but you won’t go more than 200-250 Nmiles;
    :p

    I think its fair to assume that the Gripen E with AA-load (range 1600km or >860nm) will be able to fly at above mach 0,9.

    We could use Obligatorys excellent equation to get an answer.

    Drag force (Newtons) = 0.5 x P x V^2 x Cd x A

    P = Density of Air (kg/m^3) ~0.232 kg/m^3 @ 12,000 m / 40.000 ft
    V = Velocity (m/s) ; Mach 1 = ~295 m/s @ 12,000 m
    Cd = Co-efficient of Drag ; <0.6 (for low drag drop tanks, but of course it varies depending on speed)
    A = Sectional Area (m^2) ; ~ 0.13 m^2 for a 14″ diameter drop tank.

    Drag Force @ Mach 1 = 0.5 x 0.232 x 295^2 x 0.6 x 0.13 = 790 Newtons.

    62,3KN is enough to get over mach 1,2 with missiles (in the two seat demo version).
    56KN is enough for mach 1,0 with missiles on single seat and lower drag Gripen C (54KN is standard dry thrust).
    Even with my old coefficient from the FA18E of 7% it would be fast enough.

    So with or without drop tank the NG will be able to supercruise and thus it will be faster than a F35.

    Same goes for the EF2000.

    in reply to: F-35 News thread. Part Deux #2285991
    Tu22m
    Participant

    It was already disclosed that F-35 needs ‘just a little a/b’ to stay supersonic,
    i believe what is referred to here is a dive, or plain trolling.

    In that case it’s not supercruise.

    Does anyone actually have sources? Oh, btw. The post before was excellent. Thanks a lot.

    Also, I would be skeptic about this claim:

    What is known is that the ole standard gripen could supercruise M1.1 with A2A + 1 drop tank.
    sort of expecting Gripen NG to up the ante here quite a bit 😎

    That claim is supposed to come from a news article in flygvapennytt 2001 and should be about the A version. Later claims (from a period in time when the C model was in service/production) say it could fly supersonic without A/B at high altitude during cold weather with very light weapon load. I think that is closer to reality.

    That does not make much sense. If the coatings were prone to overheating at M1.2, then the max. speed of M1.6 would be next to unthinkable to achieve or maintain. Using SC or A/B to achieve these speeds has zero impact on this.

    The fuel capacity being the reason seems unlikely, too. If the engine was consuming two thousand liters per minute at full dry thrust, then using A/B would be almost impossible without sucking your reserves dry within seconds.

    I personally think that the figure is some kind of a ”me-too” type trick, so that the folks in charge can place a check in the ”yes” box in the chart line with ”supercruse capability”. An idea – get your F-35 to M1.6 using afterburner, then switch it off and fly straight at full dry thrust while the speed slowly gets down to M1.2 – there you have your 150 miles of ”supercruise”.

    Either way it’s pretty unimpressive.

    If the supercruising combat radius is 150 miles (total range 350nm) I might accept it since the fuel consumption for 125KN dry will be closer to 125KN wet in the Viggen. But if the F35 needs afterburners then… then its not sc.

    The reason I brought up the coatings as a possible explaination was that it has been a problem before and that they limited supersonic fligh/tafterburner use to a few minutes because of that and cooling problems.

    in reply to: F-35 News thread. Part Deux #2286112
    Tu22m
    Participant

    The news of the F-35’s supercruise ability was just to finally put an end to the naysayers claiming that the F-35 cannot SC because LM never claimed it could, it’s too fat, the F135 is not made for it, it’s too heavy, etc. Now they can go on about if it was in a dive, what fuel state did it have, was it armed, what altitude, what temp, did it have a tailwind, what was the subsonic range before & after the SC dash, etc, etc.

    Funny thing, that info has never been released about the Tiffy, Raf, Gripen NG, Su-35, or even the F-22 yet many claim and readily accept their ability to SC.

    That info has been released. What I found interesting was the rather short range och F35 supercruise. 150 miles is less than the old Viggen flew with full AB @ mach 2+… and that was a plane that was known to be thirsty.

    I would still call it SC but the range… it can’t consume all fuel in that time. There has to some other reason for the extremely short SC range.

    Just as comparison;
    The Viggen had 125Kn in power output with afterburner and burned fuel at a rate of 1000 litres per minute. If the F35 is to burn 10’000 litres during those 150 miles (nautical?) it will use it up at over 2000 litres per minute for the same power output.

    I don’t buy it (the range issue), it should be closer to 350nm at least. The only explaination i can think of is that its a safety thing for the cooling or coatings. So its 2×150 miles SC @ mach1,2.

    in reply to: F-35 News thread. Part Deux #2286206
    Tu22m
    Participant

    Such a ahame that the other fighters you refer to are about as useful as a chocolate tea pot when doing anything more than CAP over friendly territory.

    ( And please kids, spare us all of the tiresome and grossly ill-informed response that go along the lines of “but but standoff weapons can do it all!!!! there’s no need to be survivable because of cruise missiles!!!!” )

    I think the other fighters, maybe except for Eurofighter, turned out to be of excellent value in Unified Protector. Even at the time when Libyan SAMs where operational.

    It still is cheaper to drop a JDAM from an F16 than to fire away a Tomahawk. As long as that is true there will be a purpose for multirole fighters.

    in reply to: F-35 News thread. Part Deux #2286221
    Tu22m
    Participant

    It does not outrange the F 35: http://forum.keypublishing.co.uk/showthread.php?t=88277&highlight=35+TAC+Brawler

    Where did you get this from???

    According to@signatory, the premier Gripen source on internet,
    a few post’s below:

    Or one could check out the offer to the Netherlands.

    Gripen NG
    Un-refueled range
    (internal fuel)
    2500 Km
    Combat radius (incl 30
    min on station)
    Ex. 4 RR + 2 IR + ext fuel
    1300 Km [30 min on station = >500km range or 250km radius]

    This is a combat radius of around 860nm while the F35 only reaches 584nm currently (this might change over time)

    When it comes to speed we can check what other fighters can perform.
    EF2000 with loaded weight (approx) and 3 1000 litre drop tanks reach mach 1,6 in 1999.

    The most ill constructed fighter in a long time when it comes to drag from missiles (because of and outward canted pylons in the FA18E) still manages to get close to mach 1,6 with two amraams and 2 sidewinders and then continues to have about a 7-9% penalty for every step of additional load like drop tank, another pair of missiles etc.

    On fighters that doesnt have a pylon layout like that i think its fair to say that <7% drop in flight performance is a reasonable approximation on the upper side. And it works well for the Eurofighter as well. mach 2 x 0,93³ = around mach 1,6 which was performed with three drop tanks in both early trials as well as later on.

    So the added drag is of minor importance for speed performance and i think one might see a similar performance drop in maximum acceleration. Wing tip missiles are barely noticeable and this is just an approximation.

    This should mean that an F16C with 4 amraams could hold a speed of around mach 1,7. (Based on a C version with no CFTs that can reach mach 2)

    in reply to: what kind air force you build #2286569
    Tu22m
    Participant

    I would opt for Gripen as a low maintenance and high performance backbone.

    Fighters:
    40 Gripen (30 Gripen E, 10 Gripen D+). The D+ is the same as the upgraded C version but a two seater and if possible the D+ would be overhauled and upgraded SwAF jets.
    39 Su27/30 until retirement, in the end only the Su30MK2 would be kept and maybe increased in number from 15 to 20.

    AEW&C
    6 ERIEYE based AEW&C

    SEAD/Strike
    up to 20 F35 or other stealthy platform to get close to enemy air defenses and/or other “hot” territory. This could be replaced by UCAVs.

    Helicopters:
    Mostly Mi-17 for transport.

    SAM, reducing the number of different systems.
    40-100 Pantsir S1
    S300

    Problems: Weapons and datalink integration when mixing russian and NATO/link-16 standards. Luckily this is an area where Gripen is pretty good. In a perfect world the Su30s could be sold to a neighbour and replaced with the F35 or something similar.

    in reply to: F-35 News thread. Part Deux #2286656
    Tu22m
    Participant

    The top speed does not matter, it will just rise the closing speed in the typical head-on encounter. It is reached briefly and in full burner high up. The Russian bombers had that dash capability to overcome the SAMs or to have some disengagement capability. Close to 100 % of mission time that were operated at subsonic speed. For some decades fighters did not run to catch bombers but were guided to some intercept points were the AAMs will do the task. Even in WW2 the fighters had to wait for the bombers to come and just a few damaged ones were chased after their weapons-load dropped already. that became

    You are about 100% correct. I just compare the F35 to other things flying there and the russian bombers seem pretty relevant. I dont know of any fighter apart from FA18E that is limited to

    in reply to: F-35 News thread. Part Deux #2286883
    Tu22m
    Participant

    Why do people consider the F-35 a slow aircraft – Mach 0.9 is a pretty high speed for the approach stage to target. What is the typical approach speed to target of Typhoon with warload and EFTs?

    The F35 is considered a slow aircraft because of it’s low top speed (mach 1,6) and because it lacked supercruise capability. The latter seems to be fixed now and mach 1,2 without AB while carrying 4 missiles is on par with the current gen 4,5 fighters like the EF2000, Gripen E and the modern Flankers.

    The top speed however is still pretty low considering that the russian bombers like Tu22M3, Tu160 can fly above mach 1,8 (over 2200km/h vs 1900km/h).

    In theory the F35 should be able to fly faster than the bombers but currently there are problems with the coatings etc that get severely damaged and there are also cooling problems at high speeds. So thats why it still is considered pretty slow.

    in reply to: Frankenplane Prototypes #2287088
    Tu22m
    Participant

    Look no further than ramjet-powered helicopter blades. One (quite unsuccessful but at the very least, functional) example:
    http://en.wikipedia.org/wiki/Hiller_YH-32_Hornet

    Goes to show that it’s possible, though.

    I know that project existed, but doing it 20 years earlier AND putting the rotor in the middle of the airplane is a pretty stupid idea. Helicopters can stabilize themselves thanks to the low point of gravity. This howver is a death trap.

    I think these are pretty similar.
    http://www.testpilot.ru/russia/mikoyan/e/8/images/e8.jpg
    http://flyeaglejet.com/J-10/2.gif

    in reply to: Frankenplane Prototypes #2287111
    Tu22m
    Participant

    The Strike Viper looks pretty similar to Su34.

    If you want Frankenplanes that where crazy projects look no furter than Luft46 for German WWII testplanes.

    Focke Wulfs VTOL jet accellerated rotary aircraft has to be one of the goofiest.
    http://discaircraft.greyfalcon.us/picturesc/tr18.jpg

    How did they expect it to be safe to operate?

    Haha, wtf? I didnt notice that it had wheels. This design explains why Siemens never really made it with their cellphones 😉
    Wtf #2… how was the fuel expected to enter the engines at the end of the propellers?

    in reply to: F-35 News thread. Part Deux #2287272
    Tu22m
    Participant

    http://www.defense-aerospace.com/articles-view/feature/5/139745/f_35-faces-new-hurdles-in-netherlands%2C-italy-and-canada.html

    Seems both Holland and Italy are surprised?

    They shouldnt complain. It’s still cheaper than the Hungarian Gripen C/D lease if you put the flyaway price for the Gripen at 50-60m$ and extend the deal to 30 years.

    Gripen E, for 30 years will in TCO cost the Swedish taxpayers 1,5bn SEK each or around 223m$.

    The F35 is only 37% more expensive than the Gripen (when you go by the 85 airframes offer).

    If you use the ratios from the Janes report on fighter costs you will quickly see that the F35 for Netherlands looks cheaper than the F16. I dont think it is possible that a stealth fighter with twice the loaded weight of the F16C can be cheaper to operate. Something is missing in the Dutch numbers.

    in reply to: F-35 News thread. Part Deux #2288003
    Tu22m
    Participant

    Thats fine Tu22m.

    The line “short range missile kills will always be tricky to evade and thats where kills will continue to dominate” doesn’t mean anything… because you are basing that on historical evidence rather than current and more importantly future missile capability (reflecting the heavy BVR emphasis in current AtA planning)

    Im not saying there is any difference. You can have short range AMRAAM kills as well. It gives the enemy less time to respond, thats all. And that has been the case always. The closer the enemy is the higher is the probability of a kill.

    Many new solutions look super dandy on paper, at least up to the point where you assume that the enemy has something equivalent. So countermeasures are not everything here, even the capability it self is enough to scare the enemy away or make them keep the distance. The topic is to complex to be able to cover all parts on a few forum posts that are off topic.

    And if it gets really difficult one can always use low tech solutions to force the enemy to fight on more equal terms. Currently we have only talked about high tech solutions but just like the Serbs one can use simple solutions to even the odds.

    in reply to: F-35 News thread. Part Deux #2288071
    Tu22m
    Participant

    The F-18E has a lot of inherent drag that keeps it from getting to m1.6 while carrying just 2xAim-9 and 2xAim-120. Going 4xAMRAAM would be even worse due to extra canted pylon on each wing.

    I think its a fair bet that the FA18E with the EPE will get above mach 1.6 with BVR missiles. Or what do you think? 20% extra thrust gives over 2% extra speed? http://www.boeing.com/AeroIndia2011/pdf/Aero_India_Super_Hornet_Briefing.pdf

    @LmRaptor: We can argue forever on the topic. But if the EWS is up to date then its near impossible to get a BVR kill. WVR or short range missile kills will always be tricky to evade and thats where kills will continue to dominate.

    in reply to: F-35 News thread. Part Deux #2288187
    Tu22m
    Participant

    Where did I say that either the EF or Rafale were high drag while armed designs?

    So you are saying that the Eurofighter is not having a high drag penalty while carrying 3 1000 liter drop tanks?
    At the same time the FA18E, carrying only wing tip missiles + 2 centerline AIM120, has a high drag penalty?

    Or does this scenario make the FA18E have a low drag penalty?

    The FA18E is a pretty unique fighter with its outward canted pylons but while using the centerline ones the increased drag should be very tiny.

    What you said:

    I meant planes with external weapons that have a high drag penalty.

    It should include the EF2000 with three droptanks. Thats all.

    in reply to: F-35 News thread. Part Deux #2288269
    Tu22m
    Participant

    I meant planes with external weapons that have a high drag penalty.

    In that case I call that claim bs.

    http://www.targetlock.org.uk/typhoon/development.html (About Eurofighter)

    DA3 has flown with fully-functioning 1000 liter supersonic fuel tanks, and with subsonic 1500 liter subsonic tanks. The aircraft reached Mach 1.6 with up to three 1000 liter tanks attached, which is a major achievement for a fighter aircraft.

    Confirmed by official channels as well.

    http://www.eurofighter.com/eurofighter-typhoon/chronology/jumper/chronology-1999.html

    December 1999
    1st in-flight relight with 03Z engine
    1st Flight with full functional Inertial Measurement Unit (IMU)
    1st time Mach 1.6 with 3×1000 litre tanks
    1st Flight with AVS SP 3A

    Maybe its just me but I think it could be made with the smaller and lighter AMRAAMs too.

    Rafale, Gripen E both have similar thrust/weight ratio.

Viewing 15 posts - 1,096 through 1,110 (of 1,142 total)