Other than F22, another bird that can cruise at 65,000 feet is the mighty Foxhound at mach 2.34. The venerable U-2 spy ship can cruise at 70,000 feet. No other birds can fly higher than that cause it's almost the edge of space and with so little oxygen, they need onboard oxygen to feed the combustion.
kalau macam tu bro.... possibility untuk delta wing aircraft untk fly higher adalah tinggi ...
lkick2113 Post at 6-5-2011 10:14
Not necessary delta, yang penting swept back, kalau tak, tak boleh fly at high Mach Number. Contoh like my avatar ni, straight wing, plane airspeed kata la baru M0.7 tapi airflow atas wing dah M0.9 dan akan sampai M1.0 dulu sebelum plane speed sampai M1.0. when this happened, wing tu dah tak effective, sebab no more lift generated. Sebab tu kena buat swepback wing just to delay the airflow over the wing reaching supersonic ahead of the plane. Eventho plane at M2.0 some part of the wing still at subsonic to generate enough lift.
Plane flying at high altitude have to fly high speed to have sufficient lift. Contohnya concord. Tapi kalau swept back jer,without increasing the wing area, problem pulak bila fly low speed. So to compromise, Delta wing. atau pun variable swept wing plane macam tomcat.
Not necessary delta, yang penting swept back, kalau tak, tak boleh fly at high Mach Number ...
kelana36 Post at 6-5-2011 14:48
tq bro, baru paham bila u bg contoh tomcat, sama la macam ausie punye fighter dulu ape nama nye..F-111 tu kan???? x silap F-111 tu memang laju 2.5 M kalau x salah la...tapi untuk pengebom, pengawalan ketinggian memang penting ..... kalau mcm kes B2- stealth bomber tu camne bro???
tq bro, baru paham bila u bg contoh tomcat, sama la macam ausie punye fighter dulu ape nam ...
lkick2113 Post at 6-5-2011 10:58
F111 designed for interdiction, fly high speed at low level, avoiding radar, using TFR, terrain following radar. Basically pilot boleh engaged autopilot and let the plane fly by itself at predetermined height above terrain. Variable swept, fully swep at hight speed and extended bila fly low speed masa nak landing. Bomber macam ni tak boleh nak buat delta wing, sebab akan reduce ground visibility, or terlindung , tak nampak bawah. B2, subsonic designed for high level bombing , big wing just to carry more loads, mostly guided bombs. Plane macam ni boleh terbang tingi2 tanpa radar detection coz of it stealth capability, and high enough to avoid SAM or the AAA.
Lockheed Martin's F-22 Raptor production line is back on track after the U.S. Air Force's fleet-wide grounding of the jet had disrupted deliveries to the service, the company said.
" We are delivering jets, " said Lockheed spokeswoman Alison Orne. " The last one delivered was 4185. 4195 will be delivered in late spring 2012. "
Tail number AF 09-4185 has technically been delivered with the signing of a DD-250 form, but the stealthy fifth-generation fighter is currently undergoing government flight tests. After the completion of the tests this week, the Air Force's 1st Fighter Wing will fly the jet to Langley Air Force Base, Va ., where it will be based.
" It is scheduled to depart for Langley on Dec. 8, " Orne said.
The final Raptor to be built, AF 09-4195, will also be delivered to Langley, where it will fly with the 1st Fighter Wing's 27th Fighter Squadron, the service's oldest fighter unit. It is expected to be delivered in Spring 2012, according to Lockheed.
" 5/2/2012 This F-22 Raptor to be delivered to the U.S. Air Force is number 195. The aircraft is the last of the F-22's to be produced and put into service by the U.S. Air Force. Production started in 1997 and ended in 2012. "
Air Force F-22 fighter jet crashes near base in Fla; pilot ejects safely, no ground injuries
By Associated Press,
Updated : Friday, November 16, 6:49 AM
TYNDALL AIR FORCE BASE, Fla. — An Air Force F-22 Raptor fighter jet crashed near a Florida Panhandle highway Thursday, but the pilot was able to eject safely and there were no injuries on the ground, the military said.
The single-seat stealth fighter, part of a program that has been plagued with problems, went down Thursday afternoon near Tyndall Air Force Base, just south of Panama City on The Gulf of Mexico. The pilot received medical treatment and a section of Highway 98 that runs through the base was closed as rescuers responded.
The crash was on Tyndall land and no one on the ground was hurt, said Air Force Sgt. Rachelle Elsea, a spokeswoman for the base where F-22 pilots train.
The Air Force said the plane went down in a wooded area near the highway.
The cause of the crash isn’t clear, but the Air Force has been trying to address problems with the $190 million aircraft for several years. In 2008, pilots began reporting a sharp increase in hypoxia-like problems, forcing the Air Force to finally acknowledge concerns about the F-22’s oxygen supply system. Two years later, the oxygen system contributed to a fatal crash. Though pilot error ultimately was deemed to be the cause, the fleet was grounded for four months in 2011.
New restrictions were imposed in May, after two F-22 pilots went on the CBS program “ 60 Minutes ” to express their continued misgivings. The Air Force has said the F-22 is safe to fly — a dozen of the jets began a six-month deployment to Japan in July — but flight restrictions that remain in place will keep it out of the high-altitude situations where pilots’ breathing is under the most stress.
Internal documents and emails obtained by The Associated Press earlier this year show Air Force experts actually proposed a range of solutions by 2005, including adjustments to the flow of oxygen into pilot’s masks. But that key recommendation was rejected by military officials reluctant to add costs to a program that was already well over budget.
Three F-22s deployed to Kadena Air Base in Japan made precautionary landings over the period of three days in April for various reasons. However, none of the pilots complained of breathing problems that previous pilots had experienced in the fifth generation fighters, Air Force officials said.
It’s unclear what caused these precautionary landings, but the result of them have not incurred “unique flight restrictions” for the 12 F-22As deployed to Kadena, said 2nd Lt. Hope Cornin, a spokeswoman for the 18th Wing.
Two F-22s made precautionary landings on April 1, while another F-22 made a precautionary landing on April 3, Cornin said. No injuries were reported in any of these incidents.
The F-22 remains under a microscope as the fifth generation fighter continues to operate without the flight restrictions the Air Force had placed on the fleet because of complaints from pilots about a lack of oxygen in flight. The service worked for more than two years to figure out the problem and then come up with a solution.
Air Force leaders believe they have solved it by replacing the breathing regulator/anti-g (BRAG) valve, installing a new back-up oxygen system and changing the oxygen schedule for the F-22’s onboard oxygen generation system (OBOGS).
Plenty remain skeptical, but there have been no reported incidents since the Air Force lifted the flight restrictions to protect pilots.
Cornin pointed out that the F-22s involved with the precautionary landings never lost their flight status because of the problems experienced by the pilots.
F-22s with the 1st Fighter Wing, JointBase Langley-Eustis, Va., and the 192nd Fighter Wing, Va. Air National Guard, deployed to Japan in January and are scheduled to return to the U.S. this Spring, Cornin said.
Post time 6-5-2011 02:22 PM
