Inde : Tejas LCA & moteur

Admin a écrit:

Le Rafale C01, qui arbore une livrée noire suggérant la furtivité, est
significativement différent du démonstrateur Rafale A. La compacité du
moteur M88 par rapport au F404 permet tout d'abord d'alléger le
prototype d'une tonne (8,5 contre 9,5 tonnes pour le Rafale A) en réduisant sa longueur d'un mètre, son envergure de 1,15 mètre et sa surface alaire de 2 m². Au niveau de l'aérodynamisme, la voilure est elle-même simplifiée, revenant à une aile delta simple prolongée par un apex vers les entrées d'air. L'empennage
est raccourci et sa jonction avec le fuselage est revue, déplaçant
l'entrée d'air auxiliaire du pied de l'empennage vers la verrière.

http://fr.wikipedia.org/wiki/Dassault_Rafale#D.C3.A9monstrateur_Rafale_A

;)

Beochien a écrit:Un point sur le Tejas, qui a volé le 17 Janvier, sur AV-Week, aprés 30 ans de développement. !
Des hauts, des bas , des retards, et une version motorisée F414 un jour, because un peu lourd  !
La version marine a pas mal souffert aussi, les trains à revoir !

Plus qq lignes qui expliquent un peu l'attitude Indienne vs le Rafale !

Un extrait :

After almost 30 years of design and development, deliveries of India’s indigenous lightweight fighter, the Tejas, to the air force are finally underway. But achieving full operational capability, fielding a naval variant and developing a fully capable Mk. 2 version remain to be done.

In spite of the length of time, handover of the first Hindustan Aeronautics Ltd. (HAL) series-production Tejas—aircraft SP-1—to the Indian air force  on Jan. 17 was hailed as an achievement. To accomplish this, the industry had to conquer hurdles related to U.S. sanctions over India’s nuclear testing that interrupted access to key suppliers in the middle of development, resulting in delays and cost increases.

http://aviationweek.com/Tejas?NL=AW-05&Issue=AW-05_20150213_AW-05_621&YM_RID=%27email%27&YM_MID=%27mmid%27&sfvc4enews=42&cl=article_2&elq=~~eloqua..type--emailfield..syntax--recipientid~~&elqCampaignId=~~eloqua..type--campaign..campaignid--0..fieldname--id~~

ndia's home-grown Tejas light combat aircraft (LCA) might never fire a shot in anger at its Pakistani counterpart, the JF-17 Thunder. Yet, the Tejas is already squaring off against the JF-17. When the Indian fighter performs aerobatics at the forthcoming Bahrain International Air Show international aviation experts will directly compare it with the JF-17, which flew at the Paris Air Show in July.

The Tejas team is geared up to impress the experts in its international debut. Business Standard learns that the Aeronautical Development Agency (ADA), which oversees the Tejas' development, has put together a flying routine that "significantly surpasses any aerobatics display the fighter has presented earlier."

"So far, we have always flown with large safety margins in hand. At Bahrain, we will show the spectators what the Tejas can really do, how much energy the fighter has", says an ADA official closely associated with the preparations.

The "Made-for Bahrain" display routine will test the Tejas' limits in vertical climbs, high-speed runs, tight turns and the fighter's slow flying ability.

With the flight-test programme having recently cleared the Tejas for 8G turns (which create stresses on the aircraft that are eight times the force of gravity), the performance at Bahrain will include two 8G turns in front of the display stand. "We do not intend to return to India feeling we could have done more. Aerospace experts will scrutinise every performance, and recordings of these, over succeeding months. We hope to make it worth their while," says the ADA official.

Two Tejas fighters will fly to Bahrain for the air show on January 21-23. These fighters, along with three pilots, are already at an air base in Gujarat, practising their routine in sea level conditions akin to Bahrain. In mid-January, they will fly to Muscat, and then to Bahrain.

Air show performances serve various aims. Some displays are structured to entertain spectators with spectacular, but technically easy, flying. Others emphasise pilots' skills, such as close-flying displays. The Tejas, however, will present a "product demonstration", which showcases for potential customers the performance aspects that make it a good combat aircraft - such as the ability to climb quickly and turn tightly.

"A good 'product demonstration' must translate dry capability statistics into actual flying performance that makes an impact on potential customers", explains a veteran test pilot. As the Tejas has passed performance milestones in a flight-test programme that began in 2001, it has flown and climbed faster and turned tighter, transforming the sedate "flying displays" of the mid-2000s into today's exhilarating aerobatics.

Tejas pilots and ADA officials are confident the fighter will bear the stress of edge-of-the-envelope flying for several weeks. "The Tejas is often criticised for being too heavy. But that also makes it a structurally strong aircraft, with plenty of reserve strength to push the performance envelope," says a veteran Tejas test pilot.

While the Tejas aims to entertain the spectators, and enthuse the aerospace analysts, the primary intention of featuring it at Bahrain is for evaluation by prospective buyers, who study recordings of air show performances.

"Big aerospace corporations like Boeing, Lockheed Martin and Dassault have in-house media teams, which produce high-quality, professional recordings of their aircrafts' performances. ADA is handicapped in this respect", rues an official.

The JF-17 Thunder, which already equips three squadrons of the Pakistan Air Force (PAF), enjoys a lead of several years over the Tejas. Numerous press reports suggest that Sri Lanka has asked to buy the fighter, although Colombo denies this.

The JF-17 has also been more visible internationally. It debuted in 2010 in a static display at the Farnborough Air Show in the UK, and has flown in several air shows, most recently at Paris in July 2015.

However, the fourth-generation Tejas is technologically superior to the third-generation JF-17. Built of composite materials, the Tejas is more manoeuvrable, has better avionics and can carry more fuel and weapons. Eventually, however, customers seek assured production and delivery, and in that the JF-17 is ahead. Pakistan's Kamra factory has already delivered 66 fighters to the PAF, assembled for the most part with Chinese components. Hindustan Aeronautics Ltd has delivered only a single Tejas to the Indian Air Force.

What Livefist has now discovered from the team is that there are design and engineering improvements being effected on the LCA Navy Mk.2 that could prove dealmaker if they work out.

For starters, the team plans to move the wings outboard by about 350mm, increasing the space significantly between the fuselage and the wings. This would immediately optimise load transfer (the ADA has had weight issues with the landing gear) and free up the central fuselage for fuel. ‘We believe the change will free up space for up to 700 kg additional fuel, providing about 22 minutes of additional time on task,’ Balaji tells Livefist. That’s huge for the tactical envelope the LCA platform was developed for.