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wilhelm

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  • in reply to: why doesnt europe make their own F-35? #2329283
    wilhelm
    Participant

    More efficient ?
    Well, they only do half of the job. The other half has to be done by the USA, UK, Germany and France… :p

    And yet Sweden has managed to put almost every plane they design into active service……

    That is very efficient from anybody’s point of view. Very efficient indeed.

    in reply to: Mirage 3/5 v F1 comparison #2329834
    wilhelm
    Participant

    ?!
    Strangely the FAA doesnt know!

    I have been asking for a pointer to an official confirmation that discussions about this are even taking place, with no success.;)

    On another note, I see that wiki (I know..) says that “1422 Mirage III/5/50 aircraft were built by Dassault.” Does this include the aircraft made in Belgium, Australia and Switzerland? Does it include the Kfir, which were apparently only assembled in Israel?

    Also, the Mirage III was the first combat plane bought by Australia from mainland Europe, and was their first “made in metric” aircraft. It was chosen in 1960 from the other contenders due to its multi-role capability. This has been borne out I guess by the roles that the Mirage has been used in various conflicts.

    in reply to: Mirage 3/5 v F1 comparison #2329931
    wilhelm
    Participant

    The only “real war” the Mirage III was involved in was the isreal/arab 67 and 73 wars. In both wars the best fighter it was faced with was the mig-21 which was underpowered and not an easy jet to handle. Also in 66 the Isrealis got their hands on a mig-21 from a defected pilot to test out its flying characteristics. In my opinion the Isrealis use of the Mirage III was a liability that could have been exploited by the arabs. I chalk it up to good training on the Isrealis part that they came out so well.

    I forgot, they have 9 kfirs.

    You certainly have an interesting take on things. Much of what you say is wrong.

    The Mig 21 is underpowered and not an easy jet to handle???:rolleyes:

    Let us take the Mig-21F13 and the Mirage IIICJ.

    The Mig had a much better thrust-to-weight ratio than the Mirage III, yet still invariably came off worse. The Mig 21 was noted as being not a particularly difficult jet to fly well, hence, among other factores, it sold so well.

    What constitutes a “real war” by the way?

    The Mirage III has been used in the Falklands, Egyptian-Libyan war of 1977, Angola during the 70’s and 80’s to mention just a few. It has been used as a fighter, bomber/ground attack, reconnaissance and anti-ship platform. It has performed these roles successfully for the most part, and the few times it has struggled, such as in the Falklands, it was as a result of defective bomb fuses and obsolete AIM-9 Sidewinder models whilst operating at the very extreme edge of its range envelope.

    The Mirage III has been a resounding success looking back from the vantage point of today.

    in reply to: Mirage 3/5 v F1 comparison #2330626
    wilhelm
    Participant

    Madrat, is there any official confirmation of negotiations on the Mirage F1?

    I’ve not seen any yet.

    in reply to: Mirage 3/5 v F1 comparison #2330642
    wilhelm
    Participant

    here you go

    Thanks for the link, arquebus, but that is not official.

    There is a thread here on the Argentine airforce where it is explained that a Mirage F1 purchase is extremely doubtful, seeing as more capable second hand aircraft deals at low prices have been turned down already.

    Certainly Argentina will have to act very soon on replacing their Mirage III’s, as they are at the end of their lives.

    in reply to: Mirage 3/5 v F1 comparison #2330891
    wilhelm
    Participant

    wilhelm- I dont understand why you like the Mirage III series so much, it has awful turning capability and would get torn apart in a dogfight by just about anything with a jet engine. FBW makes all the difference, it works wonders for a tailless delta and turns it into a very agile fighter.

    Almost none, they have been retired by just about every AF that used them, mostly by unloading them to Pakastan who is desperate to fly anything that will go Mach 2. I think the only AFs still using them are:
    Egypt – 50
    Argentina – 14, all are going to be replaced by F-1 next year
    Pakastan – 150
    Colombia – 24 kfirs
    Ecuador – 13 kfirs, 12 cheetahs

    thats it, no other AFs are using them

    I like the Mirage III because it is still in gainful frontline service in it’s 6th decade after it first flew. I also wasn’t aware it was the norm for 1950’s designs to have FBW control systems, so thanks for straightening me up on that one, arquebus.:rolleyes:

    You mention a single aspect of the delta planforms flight performance.

    Argentina is replacing the Mirage III with the F1? Can you let us have the official source for that, please?

    And by your count list, that’s 5 countries, spread over a fair bit of the globe, still operating approaching 270 airframes.

    That’s not insignificant considering the antiquity of the Mirage III design.

    in reply to: Mirage 3/5 v F1 comparison #2331051
    wilhelm
    Participant

    It was no forsight, just the lack of a viable AAM against a fighter-sized target at that time-scale. From the 70s the Israeli Mirage/Nesher scored with AAMs mainly. 😉

    And yet many of the other designers seem to have had a brain-fart at the time by omitting internal guns.

    Which countries are using the Mirage III/5/50/Kfir/Cheetah at present?

    Any idea of numbers?

    in reply to: Mirage 3/5 v F1 comparison #2331763
    wilhelm
    Participant

    And unlike the people who produced the EE Lightning, F-106, F-4B/C/D, and many of the early MiG-21s, Dassault had the foresight to fit the Mirage with guns from the very beginning. could you imagine the outcome of the 1967 war for the Israelis without guns on their Mirages??:eek:

    Indeed.

    I think Dassault got the balance very right in many aspects, hence it’s continued use after all these decades.

    in reply to: Mirage 3/5 v F1 comparison #2331843
    wilhelm
    Participant

    Looking at it now, the Mirage III was actually an exceptional design.

    Used successfully in combat, it first flew in 1956, 55 years ago precisely in the next few days.

    The first operational deliveries of the Mirage IIIC were made in mid 1961, more than 50 years ago. Versions of it may even make it’s 60th birthday as a frontline combat type.

    That is a lasting testament that this design is still in operational front line service today. I’m aware that the Mig-21 has similar longetivity, but the fact is, that the Mirage III has been deemed worthy enough for many countries to comprehensively upgrade them, in many different ways. It has morphed into arguably a still very effective BVR interceptor with a glass cockpit, new radar, more powerful engine (ATAR9K50 or J79) as can be witnessed on probably the ultimate extrapolations of the basic design, the Cheetah C and Kfir C10.

    Israel has offered a Kfir 60 to the Bulgarian(?) Airforce just in the last few weeks. Anybody know what this entails? Over the Kfir C10? How many Kfir airframes do they have left to upgrade?

    And talking of that, how many Mirage III’s were built in the end? I’m talking inclusive of Mirage 5 and 50 models, as well as the Kfir, due to them being assembled from French kits. I seem to recall around 1300?

    in reply to: Mirage 2000-5Mk2 vs Gripen-C/D #2369366
    wilhelm
    Participant

    Ive said many times already that FBW made a drastic change to what the M2K is capable of over the Mirage III, the change is like night to day, no comparison. The engines only reinforced the drastic change in handling afforded by centering the CoL over the CoG. But airframe-wise it was still similar to the Mirage III.

    You said:

    The M2K was just an updated Mirage 3/5.

    It is not.

    They are a tailess delta. That is it.

    The Mirage 2000 was designed using the computer programme CATIA.

    It has a different leading edge sweep angle. It has control surfaces on its wing leading edges. It has blended wing roots. It has a different centre of gravity, controlled by a completely different control system. It has different materials used in it’s construction, including boron/epoxy/carbon.

    It has a different fuselage. Different undecarriage. Different fuselage substructures. Different physical dimensions in all planes…

    I can go on and on, but haven’t the time right now. The Mirage 2000 was a completely different, new design.

    It is not a redesigned Mirage III. It shares a tailess delta configuration, and a similar mission. That’s it.

    The redesigned Mirage III that you should be mentioning would be the Mirage IIING. Even the latest Kfir variants and Cheetah C are so different to the Mirage III as to be almost different aircraft in many aerodynamic, structural, and system respects.

    in reply to: Snecma M53 still relavant today? #2369718
    wilhelm
    Participant

    The current American engines have a dry thrust sfc somewhere between 0.68 and 0.75. The M53 P2 has a dry thrust sfc of 0.90 or in short the main shortcoming of the M53.
    The dry thrust of the P2 is 6600 kp by a weight of 1515 kg or a TWR of ~4,4 and for the F100-220 ~4,5.
    To install a higher military thrust engine into the M2k makes no sense, because the inlet-system limits max air-flow. Depending on the inlet installed some F-16s are limited in a similar way.

    Completely agree with you Sens.

    USSNovice, there is nothing wrong with the M53’s thrust to weight ratio at the time, and it would have been improved somewhat even further with the cancelled upgrades mentioned earlier.

    Also agree with Sens on the sfc issue.

    The M53 did however have certain advantages in certain flight regimes/profiles, as has been mentioned. And the Mirage 2000 was designed strongly around those.

    in reply to: Snecma M53 still relavant today? #2370440
    wilhelm
    Participant

    A while back, there were 2 programmes for an improved thrust M53. I think one was called the M53-P20, and the other the M53-PX3.

    The -P20 was to be rated at 98kN, whilst the -PX3 was to have 8-10% higher thrust and a host of other improvements, some from the M88 engine programme. The -PX3 should have had a thrust in the region of 105kN.

    Any idea whether these percentage increases were wet thrust only figures, or was there a comparative dry thrust increase too?

    in reply to: Mirage 3/5 v F1 comparison #2371669
    wilhelm
    Participant

    The origin of the Su-33 goes all the way back to the su-7. This aircraft has sensible wing loading for its weight and size which is why it has been able to accept a succession of weight adding modifications over the years. This is not the case with the F-8 which although was a good fighter, was limited in its role by its high wing loading.

    Are you saying that the Su-33, a carrier aircraft, design lies within a 1950’s strike aircraft?

    in reply to: Mirage 3/5 v F1 comparison #2372602
    wilhelm
    Participant

    How can you be sure of the above performance superiority of a navalized F1 on the F-8? Remember any carrier borne version of the F1 is going to be up to 15-20% heavier than the standard F1 due to airframe strengthening.

    I’m not sure I agree with your pessimistic weight penalty, Lev.

    The T-45 Goshawk, derived from the Hawk 60, weighs in at around 240kg heavier. That’s just over 5%.

    The Su-33, derived from the Su-27, weighs in at just over 10% heavier, and has additional equipment such as refueling probe and extra control surfaces.

    I seriously doubt your higher percentage of 20%, considering that the F1’s undercarriage, and indeed the airframe, were originally designed for rough strip operation, and thus have a fairly rugged design from the beginning. Naturally, this would have to be re-inforced for carrier operations though.

    in reply to: Mirage 3/5 v F1 comparison #2372744
    wilhelm
    Participant

    A fighter with high enough wing loading that it has to rely on blown flaps to take off for use on a carrier? Dont think that is the best option. I think the Etendard is better in the role of light strike fighter also.

    The F8E(FN) Crusader as used by the French also had to be fitted with blown flaps.;):D

Viewing 15 posts - 841 through 855 (of 1,634 total)