<prompt> Tejas yakavakwa nealuminium-lithium alloys, carbon-fiber composites, uye titanium alloys. Composite materials make up 45 of the airframe by weight and 95 by surface area. Upper and lower wing skins are manufactured from a single piece of carbon-fiber reinforced polymer. Wing spars and ribs are also made out of carbon composites. The percentage of carbon composites in the airframe by weight rose from 30 in the technology demonstrators to 42 in the prototype vehicles. Kuvakwa kwe elevons, tailfin, rudder, air brakes and landing gear doors use co-cured and co-bonded manufacturing techniques. Passage: Tejas yakavakwa nealuminium-lithium alloys, carbon-fiber composites, uye titanium alloys. Composite materials make up 45 of the airframe by weight and 95 by surface area. Composite materials are used to make a lighter aircraft by weight. Upper and lower wing skins are manufactured from a single piece of carbon-fiber reinforced polymer.  <response>: aluminium-lithium alloys, carbon-fiber composites, uye titanium alloys 