Excellent article on the Tejas Mk2 aka Medium Weight Fighter (MWF) and the thoughts and design considerations that drove choices that have been made for the MWF.
Tracking the Tejas- The Tejas Mk2 becomes the Medium Weight Fighter
Quoting only a couple of paras
In order to overcome the internal space constraints of the Tejas Mk1, MWF has been lengthened to 14.65 m, a sweet spot for a modern single engine multirole fighter. This allows the fighter enough internal volume for carrying the necessary systems, while having enough fuel for the range, endurance and performance requirements. This increase in length is achieved using two plugs, one in the nose, and another behind the cockpit. As both of these plugs are ahead of the wing, the CG shifts forward with respect to the CoL, thereby reducing the static stability margin, or in general terms, the maneuverability of an aircraft. As mentioned above, canards help to compensate for this by shifting the CoL forward proportionally to maintain the same static margin.
…
The shape of the canard was chosen after carefully studying a variety of geometries. Based on published computational fluid dynamic (CFD) studies, the leading edge (LE) sweep is expected to be equal to 50 degees. At this angle, the LE sweep provides an optimal increase in the lift coefficient with a smooth and desirable linear variation in the pitching coefficient at high AoA regimes. These CFD studies were then confirmed using extensive wind tunnel testing. A 1:10 scale wind tunnel model with canards was displayed at Aero India 2019, one of many configurations considered during the design phase. The canards typically have an adverse impact on the directional stability of an aircraft. The designers of MWF have taken measures to improve the directional stability by increasing the height of the tail fin and other measures. The increased height of tail fin is also necessitated by the elongated fuselage.




More interesting info from AW&ST
The Swiss plan to spend $8 billion on combined fighter and ground-based air defense purchase
The air force is stepping up its air policing efforts to 24-hr. coverage in 2020
And the neutral land-locked nation is taking its air defense more seriously than ever. At the beginning of this year, the Swiss Air Force increased its readiness levels, putting armed aircraft on standby for air policing duties for 16 hr. a day, 365 days a year. The next step is to provide round-the-clock coverage at 15-min. readiness by the end of 2020.
The changes are in response to criticism that the service was unable to respond to the 2014 hijacking of an Ethiopian airliner that landed in Geneva just before 6 a.m., 2 hr. before military personnel even arrived for work. The escort of the airliner was left to the French and Italian air forces, with which Switzerland has air defense accords.
The embarrassing wake-up call highlighted a dangerous gap in the country’s air defense security, and one that its air force was simply not funded to fulfill.
Such incidents have added credibility to the country’s 8 billion Swiss franc ($8 billion) Air 2030 plans to purchase up to 40 fighter aircraft and a new ground-based air defense system, all from the same pot of money.
How that will be split is yet to be determined, but OEMS have been requested to provide pricing for fleets of 30 and 40 aircraft.
..
Raytheon’s Patriot and the Eurosam consortium’s SAMP-T system will be considered for the ground-based element.
Switzerland is one of a handful of nations that call for in-country evaluations of future combat aircraft. Finland is another, with Helsinki planning a winter test in 2021.
The Swiss need, say officials, is driven by the country’s unique topography. Although simulation is now capable of answering many of the questions asked by the Swiss customer and has enabled the number of evaluation flights to be reduced from around 20 in 2008 to just seven or eight this year, officials still need to understand how the aircraft’s sensors, notably the radar, will deal with the cluttered Alpine environment. Of the seven or eight flights, two will be technical, testing the sensors in the Alpine environment, says Kaj-Gunnar Sievert, spokesman for the Swiss defense materiel agency, Armasuisse. Five of the flights will be representative of operations performed by Swiss fighters such as quick-reaction alert—scramble and intercept.Because some of the aircraft, notably, the F-35 and Gripen E, are only single-seat, data collection will be dependent on company test pilots and recordings of flight-test data. Swiss test pilots will monitor from the rear seat of two-seat aircraft where available.
Aircraft that do not show up for the evaluations are automatically disqualified from the competition.
Sweden’s Saab is optimistic about its prospects, particularly as the Gripen was selected previously, but the aircraft is arguably the least mature of the types taking part in the evaluation. The Gripen E’s appearance in June will be the first time the aircraft has left Sweden; it will be accompanied by C and D models.
For the F-35, the deployment marks the type’s first overseas evaluation because most national evaluations have been performed in the U.S. Four U.S. Air Force F-35As will make the transatlantic crossing, heading to a U.S. air base in Europe, probably Ramstein, Germany, before making the short hop into Switzerland. The company is hoping to build on its recent European successes; Lockheed notes that Switzerland already makes use of U.S.-built platforms, which means some equipment and weaponry could be reused. Questions remain, however, whether a nation that only uses its fighters for air defense duties really needs the low-observable capabilities offered by the fifth-generation fighter.
Being the incumbent could be valuable for the Super Hornet’s chances in Switzerland. This year’s evaluations will also mark the F/A-18E/F’s debut, as Boeing pulled the aircraft from competition prior to the trials in 2008.
Airbus, working with the German government is using British Royal Air Force (RAF) aircraft for the tests because the configuration of RAF Typhoons with the Phase 3 Enhancements package is the closest operational configuration to what Switzerland is being offered. If selected, Swiss Eurofighters would be in the same configuration as the aircraft soon to be ordered by Germany as Tranche 1 replacements, fitted with the new active, electronically scanned array radar.
Dassault is expected to offer its F4 upgraded version of the Rafale, with Paris leaning on its recent purchase of Pilatus PC-21 trainers and its close relationship with the Swiss government to get an edge.
Armasuisse will initially use the data from the trials to confirm the answers provided by the manufacturers in the first request for proposals (RFP) issued last July. Later, it will be used to make direct comparisons in support of a second RFP planned for 2020. A possible hurdle to this schedule is another referendum, also planned for 2020. Rather than ask whether the government should buy a particular platform, the referendum will likely be more fundamental, officials say, such as asking if the country should modernize its air defenses.
With a green light, contracts would be signed after parliamentary approvals in 2022, and deliveries would begin in 2025-30.
not exactly.. they were related to what’s been demonstrated and then they made an evaluation of credibility of different makers with their projects for the timeframe when the swiss order would have to be delivered
Exactly. They were rated on the basis of what was demonstrated. They were then also credited based on what was in the works, since all 3 types were offering a configuration that wasn’t demonstrable at that time. That is not the case anymore, with the Rafale F3R, F-35 and Super Hornet Block III at least. Gripen E is still very much in development, so they too may not be able to demonstrate all the features that they will offer on the Gripen E.
Discussing the chances of the Eurofighter in this campaign the radar isn’t everything, but it’s certainly important. Wheather Eurofighter gets a chance to showcase Captor-E later on remains to be seen. For the just completed evaluation they couldn’t get IPA8 available in time. The situation may have looked differently had Eurofighter not been the first type to be evaluated. We’ll see, the Eurofighter has evolved quite a bit and so have others. Much of the critcism of the 2008 evaluation was owed to the immaturity of the aircraft and specific systems/capabilities which are fixable and not design inherent.
The last time we saw the Swiss evaluation report, they listed down the ratings based on what was demonstrated in eval flights. I don’t see it as being fair to the rest of the contenders if that is not the case this time around. Although there is a Kuwaiti Eurofighter being built with Captor-E AESA, if it cannot be demonstrated, it cannot be evaluated.
The problem is that even the UK specific P3Ea doesn’t have a demonstrator built to that standard that can be demonstrated. Leaving aside, the extremely confusing situation regarding what is the latest spec for which customer, it seems that at least on that radar front, the Eurofighter that is evaluated will lag behind the Rafale and Super Hornet. Possibly even the Gripen E if they manage to demonstrate it fully, which is a bit unlikely given that they haven’t yet tested the Selex Raven fully as yet.
IPA8 would be the second asset with an AESA and also a twinseat. However, the aircraft currently unavailable and is at a “Frankenstein” configuration with P1Ea and the Captor-E. You are certainly better served with mature operational assets at P3Ea standard and that’s what the RAF has deployed to Switzerland. Forget about one of them being equipped with an AESA. It’s not plug & play.
P1Ea standard but with Captor-E AESA, but no P3Ea standard prototype with the Captor-E? Hmm..
So they’re not demonstrating an AESA equipped Eurofighter then. That doesn’t seem like a good approach, given that all the other contenders now have AESA radar at the latest standard flying, including the Gripen E demonstrator and the Swiss may not be very happy to check its performance on a bench.
It’s quite hard to believe that there isn’t even 1 demonstrator at the technological level of the latest Eurofighter (P3Ea?) that is being built for Kuwait. I guess once again it demonstrates the drawback with the big consortium approach where each partner has its own priorities and its own set of equipment that it wants.
The delays are due to unforeseen difficulties in software development, to a continuing divergence between Germany and the UK on the radar’s principal function, and to the late approval of a new front computer. Furthermore, the “limited availability of [radar] components for production can additionally delay the delivery,” the report says.
FWIW, it seems that the Tejas has cleared the RFI stage in Malaysia and now awaits the issue of the RFP. Although, given the state of their defence outlay, it may be a much more long drawn affair with a contract not necessarily coming anytime soon.
Tejas wows Malaysians but JF-17 and FA-50 still in the race
What Group Captain Samrath Dhankar, the demo pilot of India’s indigenously-developed Tejas Mk 1, thought would be a touch and go on the fighter’s unique strengths, with the Malaysian PM, turned out to be longish and stimulating one. Dr Mahathir was specially drawn to the neatness of the cockpit and the intuitive layout. The discussion lasted for 10 mins, with Dhankar even adding a personal flavor by telling the PM he had been to Malaysia before on an exchange program.
…
So, where does India’s locally-made fighter which got widely applauded for its agility and maneuverability at the LIMA show held last week of March, stand vis-à-vis Pakistan’s JF-17 and Korea’s FA-50 Golden Eagle?
Dhankar’s confidence comes from the fighter’s superior technology and its ability to be customized as per Malaysia’s requirements. Talking to Times of India at Langkawi’s LIMA flightline, Dhankar said, “The RMAF (Royal Malaysian Air Force) officials appeared really happy as the aircraft far exceeded their expectation. Clearly, we are not selling a product here but a capability in itself.”
[Dhankar said, ‘The jet’s fly-by-wire capability, air-to-air refueling, the avionics that have been wonderfully-integrated and the open architecture computer systems, where both Russian and Western weaponry can be assimilated, are all unique and demarcates Tejas as a different generation fighter.”
Defence Attache in the Indian High Commission, Malaysia, Aniruddh Chauhan, who has been instrumental in bringing Tejas to LIMA 2019, added, “Both India and Malaysia share this common military strategy of using both Russian as well as NATO weapons systems and Tejas has been built to make it adaptable to both.”
Malaysia has planned a two-stage procurement and in this two-stage process RMAF wants to fill up the entire gap from the lead in fighter trainer up to the medium range combat aircraft (MRCA). India is past the RFI stage, which is Request for Information, followed by RFP (Request for Proposal) which will be carried out only after Pakistan and South Korea also clear the RFI.
It is interesting to note that HAL, considering Malaysian interest in Tejas, gave out a little more elaborate information than required, for RFI stage, but lower than RFP round.
..