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wilhelm

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  • in reply to: IRS-T Or ASRAAM For RSAF? #1814867
    wilhelm
    Participant

    IIRC ASRAAM max G-limit is about 50g’s, but must remember that ASRAAM doesn’t have TVC unlike others (with the exception of Python-4/5, but that has allot of control surfaces). So 50g is pretty good for a TVC-less, minimal control surfaces missile.

    U-Darter, which was an upgraded V3C Darter, also had a G-limit of “greater than” 50g’s. Ir was also an aerodynamically controlled missile without TVC. It was retired in 2008 with the Cheetah C. The A-Darter aims to beat this handsomely and has been tested at 80g’s already, with 100g’s being the end goal. Below is from:

    http://www.saairforce.co.za/the-airforce/weapons/62/u-darter

    The U-Darter (Upgraded Darter) is a short/medium range air-to-air missile, developed from the V3C Darter for use by the Cheetah. Changes include increased weight, warhead, speeds, a digital autopilot and an improved guidance seeker within the same dimensions of the Darter. The guidance unit consists of a dual-band cooled indium-antimonide IR seeker. Manoeuvrability is greater than 50g features three acquisition modes; cage, autoscan and helmet/radar designation.

    Service entry was during 1997. The U-Darter was retired, together with the Cheetah, in April 2008.

    Guidance: Infra-red with laser fuze

    If you follow the link, there are pictures and descriptions of the entire South African missile series dating back to the start in the 1960’s.

    Back on topic. The SAAF chose the IRIS-T as an interim missile for the Gripen pending deliveries of the first A-Darter. This will only be for a period of a year or two and probably is due to air defence commitments for the 2010 World Cup. I imagine it was chosen in light of Swedens usage on their Gripens.

    Just looking at it briefly, it appears that the IRIS-T is integrated on more platforms, and used by more operators. Both are currently used on the Typhoon.

    in reply to: UK Aircraft delivered nuclear weapon #1814921
    wilhelm
    Participant

    What are the chances that there is a small strategic “reserve” being held somewhere?

    South Africa being an example of developing then storing 6 air deliverable bombs without anyone knowing.

    Governments do things very secretely sometimes, even in an open democracy. Trident seems to me to be an all or nothing scenario, without the ability to escalate or “demonstrate” incrementally if the need arises.

    I’ve no idea if the first sentence I’ve posted is plausible or possible. Would the British have to declare anything, or are their facilities inspected on a regular basis? Or does this only happen to those that are declared “rogue” states or are external to “the club”?

    Does anyone know if any if the various nuclear delivery profiles are still in the RAF syllabus and practiced?

    wilhelm
    Participant

    More likely would be the A- and T-Darters. R-Darter appears to have died, I don’t think it’s going to be integrated with Gripen, so…

    Quite correct. When the Cheetah C was retired last year, the R-Darter went with it. The remaining stocks R-Darter have been put up for sale, at a very good price. There was/is some speculation that they might equip the Brazilian F5’s, with an evaluation that is in the offing.

    The T-Darter seems to be mentioned as a successor to the R-Darter, with some speculation, as has been mentioned on this website, of a possible ramjet propulsion. Work has been done in this direction by Kentron/Denel, but I think the important thing here is funding. South Africa spends a very small amount of her GDP on defence, hence Brazilian involvement in A-Darter.

    If all goes well as it appears to be doing, it may make for some interesting projects ahead. T-Darter as mentioned, which may prove to be a very interesting missile, but it would also be interesting to see what deveopments spring out of the Umkhonto missile. There has been a containerized truck mounted land version developed, with a radar version also being actively developed.

    The present IR naval Umkhonto sprang out of the original SAHV SAM programme that was a land system to replace the Crotale in South African service.

    Nice to see interesting collaborative projects such as these,

    wilhelm
    Participant

    Below is the latest news:

    SA, Brazil to start manufacture of A Darter in 2011

    South Africa and Brazil will start to manufacture the Denel Dynamics A-Darter fifth-generation infra-red guided short-range air-to-air missile (IRSRAAM)in early 2011.

    That’s the word from Denel Dynamics CE Jan Wessels at a media briefing yesterday. He says the R1 billion five-year project that started in March 2007 is now roughly halfway in time and expenditure.

    The A-Darter is being developed for the South African Air Force’s Saab JAS39 Gripen advanced light fighter aircraft under the programme name “Project Assegaai” and for the Brazilian Air Force’s F5EM light fighter and its future “FX” aircraft. Brazilian has said it expects the system in service by 2015.
    SA is one of five countries capable of developing and building 5th generation IRSRAAM.
    Wessels says the missile is due for a range of tests this November and mid-year next year.
    “The next test, in November will be a live fire at a target. In the middle next year it will be fired from a Gripen, Wessels said.

    The 2.9m, 89kg joint South African-Brazilian design was successfully ground test fired at the Overberg test range in the Southern Cape in February.

    A Denel source who spoke under condition of anonymity at the time told defenceWeb the missile was fired from a ground launcher and performed a series of programmed extreme manoeuvres in what was the weapon’s first controlled test flight.
    The source further added that the successful test showed that a number of technical challenges had been overcome “proving the development programme is still on track.”

    Denel Dynamics, previously Kentron, started the technical development of the A-Darter in 2004.
    Wessels says the fifth generation weapon features two major advances over older weapons: “A missile ten years ago could manoeuvre at 20G. This one can manoeuvre at 90G (and has been tested to 80G), which means you can shoot at a target behind you. That is massive technology…”

    The second thing is this one images. It forms an image of the actual target and from a library it can identify that target and can be programmed to attack only certain types of targets (reducing the chance of fratricide).

    Wessels adds that anti-IR missile flare decoys are also getting very sophisticated. But because the A-Darter forms an image of the target and intercepts that rather than a hotspot as in previous-generation weapons, it can lock on to the target and reject decoys.
    Denel Dynamics scientists say it is currently taking six months to assemble the seeker head, which costs around R980 000 each, inclusive of a R200 000 pure sapphire crystal lens cover.

    The CE adds that Denel Dynamics are still doing research work on a T-Darter radar-guided medium range air-to-air missile as well as a radar-guided variant of its short-range Umkhonto IR surface-to-air missile, in use with the SA and Finnish navies.
    Regarding the Umkhonto, Wessels added that SA “wants to team up with another country but that country is not ready yet.” A medium-range version of the Umkhonto is also on the cards.

    http://www.defenceweb.co.za/index.php?option=com_content&task=view&id=2996&Itemid=420

    in reply to: Nazi Stealth Bomber #2434112
    wilhelm
    Participant

    and Huff-Duff.

    Quite correct. Apologies for the ommission.:o

    in reply to: This forum going down hill #2434115
    wilhelm
    Participant

    Im propaply one of the last ones that specially joined couse of that (and naval section) subforums….and since its gone, Ive been hanging around like some poor homless guy without proper place to lay my head:(

    Proplem with ground forces forum was that becouse none of the Balkan nations posessed meaningfull air-arm after the 90’s hulabaloo, all what was left to start pissing-contest tend to focus on that forum.

    I completely agree. The ground forces forum was great, if you minused the Balkan, India/Pakistan and India/China threads and various others.

    It would be great if they started it up again, but it would need to be heavily moderatored to remove the rubbish. Or perhaps access is only granted after a period of time, allowing the more moderate, longer term, genuine and muture posters to post in it. I remember the reasons given, but I’d argue it is very much within the scope of AFM. Land based equipment is designed to destroy aircraft (SAM’s, AAA etc), or military aircraft are designed to destroy land equipment. (Apache for tanks, HARM for radar, ALCM etc…

    I would welcome it in a controlled forum.

    in reply to: Nazi Stealth Bomber #2434127
    wilhelm
    Participant

    I erred in saying they “were never fitted.” I should have said that operationally useful sets were never utilized on a wide basis.

    According to uboat.net, the FMG 41g was “generally unsuccessful” and only fitted to the IXC boats, not the far more numerous type VII’s.
    http://www.uboat.net/technical/radar.htm

    At the same link, the FMG 42 was easily disabled by depth charges and commanders did not like to use it. It was fitted in late 1942 and that was far too late.

    The Type 21 boats arrived far, far too late to influence the war.

    About all the warning receivers told you is that a B-24 or Hudson was about to swoop down from the night sky and bomb or depth charge you.

    Undoubtedly, Huff/Duff, SONAR, Bletchley Park, and sheer numbers all helped defeat the Uboats, but it is generally accepted by every serious historian I have ever read that the Allies made far better use of Radar than the Axis.

    I absolutely agree. I just posted the original info to correct a poorly constructed sentence, as you have admitted. I agree with the rest of your assessments completely.

    I believe the Bletchley Park intercepts, along with the required daily U-boat radio transmissions, to be the most effective weapon utilised against the U-boats. Hence the absolute secrecy surrounding it. Radar and sonar (asdic) perhaps allowed a final positional and firing solution, but the intercepts were the gold.

    Sorry I came over so strongly.:)

    PS: That u-boat.net site is very good.

    in reply to: Nazi Stealth Bomber #2435838
    wilhelm
    Participant

    The first U-boats were equipped with FMG-41g Seetakt radar from 1941. All Type IXC U-boats were fitted with this set, as well as U-boats U-156, 157, and 158. The conning tower fixed antenna array was then replaced with a rotating retractable mast antenna from 1942.

    In late 1942, all U-boats were built with the improved FMG-42g.

    And finally, the new FuMO-65 was fitted on some of the Type XXI U-boats.

    All these were in addition to the various radar warning receivers fitted during the course of the war.

    in reply to: Nazi Stealth Bomber #2435852
    wilhelm
    Participant

    It’s ironic that so many people seem to be “proving” that the Germans and Japanese were very advanced WRT radar, yet they don’t seem to have been able to field tactially useable sets in the during the war.
    Alternatively, the U Boats never had radar, yet the destroyers and aircraft hunting them did.

    Complete rubbish.

    in reply to: This forum going down hill #2436546
    wilhelm
    Participant

    Who remembers the military/land systems section?

    Hehehehehehe!

    in reply to: Curtiss P-36 Hawk #1189664
    wilhelm
    Participant

    I think the SAAF used about 75 H-75A-4 Mohawks in South Africa and the campaign against the Italians in Africa.

    Here is a link with 2 black and white photo’s:
    http://www.saairforce.co.za/the-airforce/aircraft/221/h-75a-4-mohawk

    I’ll try to find out more when I get home this evening.

    in reply to: Nazi Stealth Bomber #2437171
    wilhelm
    Participant

    I was waiting for someone to reference the U-boat snorkels.

    The Germans certainly did do experiments with RAM coatings. Sumpf and Schornsteinfeger were 2 types.

    The snorkel application was one such example of their research being fitted to operational platforms.
    I would not be surprised if this was extrapolated onto a coating for the Ho-229.

    in reply to: Red Eagles: book opinion? #2437190
    wilhelm
    Participant

    If the pilots were impressed by the R-29, I’d love to know what they thought of the R-35!

    I started a little thread a while back after having a look at some of the basic data on the R-35. It pushes out 8550kg (18850lb) dry, and 13 000kg (28700lb) afterburning in a J-79 sized package of roughly the same weight!

    The Khatchaturov R-35, does anyone know the extent of the difference between this engine and the R-29?

    in reply to: $290 million F-22 Raptors for Japan #2437971
    wilhelm
    Participant

    I too agree with Quantum.

    I think it’s high time that Japan goes their own way in the fighter field. They seem to have been making moves in that direction anyway, so perhaps we may see a functional Japanese designed fighter in the not too distant future. They certainly have the skills and brains to do it, and do it well.

    It would hardly be more expensive than the F-22, even if they were allowed to purchase them in the first place, and even tough Japanese post-war military products have been expensive.

    in reply to: The Atlas Cava #2440129
    wilhelm
    Participant

    Does anyone know anything about “Project Meccano” or “Mecanno”?

    Apparentely, the early Carver was to fly with the Elta radar set as developed for the Lavi. This was to be followed on by the above mentioned project, which was a South African designed phased array doppler multi-mode radar system, with “breadboard” antennae. that was being developed for Carver. It was to be based on work done on the “Fynkyk” radar system developed and tested by Reutech(?). Certain aspects of Meccano or Mecanno were already demonstrated in the early or mid 1990’s, which fits in nicely for when Carver was to enter service around 2000 or just after.

    I’ve gleaned the above from a book I was reading, and is from memory. I will happily post exactly what was written if anybody wants.

    Anybody know anything further?

Viewing 15 posts - 1,066 through 1,080 (of 1,634 total)