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Originally posted by weedwhacker
There is an airplane,Harrier, that can take-off vertically and land vertically
Originally posted by weedwhacker
You post four incidents, out of over two decades. One, BTW, involved a COLLISION between two of the jets!!
A Marine Harrier jet demonstrates its hovering capabilities during an air show at Marine Corps Air Station Yuma in this Feb. 22, 1999 file photo. The Marine Corps suspended all Harrier jet missions at Cherry Point Air Station in Cherry Point, N.C. Sunday, Feb. 4, 2001, pending an investigation into a crash that killed two aviators. The suspension will last until the release of preliminary findings in the investigation of Saturday's crash, said 1st Lt. John Caldwell, spokesman at Cherry Point Marine Corps Air Station.
Nov 28, 2007 11:55 AM (25 days ago) AP
YUMA, Ariz. (Map, News) - A Marine Corps attack jet crashed in a remote desert training area during a training flight but the pilot ejected safely, officials said Wednesday.
The AV-8B Harrier wasn't carrying weapons. The cause of the crash was under investigation.
The plane crashed on the Barry M. Goldwater Range, a sprawling desert area of southern Arizona about 50 miles east of the Marine Corps Air Station Yuma, where the aircraft was based.
Crew escapes Harrier jet crash
Independent, The (London), Aug 25, 2000
TWO MEN, the crew of a pounds 16m Harrier fighter plane, escaped with minor back injuries by ejecting minutes before it nose-dived and burst into flames yesterday. The aircraft had been on a routine mission when it crashed over Boscombe Down, near Salisbury in Wiltshire.
Originally posted by landing
Originally posted by weedwhacker
There is an airplane,Harrier, that can take-off vertically and land vertically
www.msnbc.msn.com...
thatvideosite.com...
news.bbc.co.uk...
www.air-attack.com...
It seems to me the Harrier is not too reliable.
But you don't understand anything about gravity forces. Harrier is an airplane that moves in the air and has wings: its gravity forces act on a large surface.
Put a dish on your finger. Easy to balance?
Put a coke can on it. Very difficult?
Do you begin to understand?
RLGB (Rocket Landing Going Backwards) technology is still poor, very poor.
youtube.com...
Ummm...the LEM had a huge main thruster that was able to be throttled from 10,000 lbs (45 kN) of thrust to 1000 lbs (4.5 kN). Plus it also had 16 reaction control sytem (RCS) thrusters to help control its attitude. This main thruster is what slowed its descent, while the RCS thrusters kept it in control.
By the way, a Harrier can hover because of its downward-vectored thruster. If a hovering Harrier shut off its engines, it would fall like a brick -- wings, flaps, and all (although I suppose its wings would provide some air resistance while the Harrier is falling like a brick, but definitely no aerodynamic lift).
An wing requires a certain forward speed to work as an airfoil creating lift. If that forward speed is too low, then a "stall" occurs, and the wing provides no lift. A hovering Harrier (or one falling straight down like a brick) is getting no lift from its wings.
After Stafford's camera failed, he and Cernan had little to do except look at the scenery until time to dump the descent stage. Stafford had the vehicle in the right attitude 10 minutes early. Cernan asked, "You ready?" Then he suddenly exclaimed, "Son of a bitch!" Snoopy seemed to be throwing a fit, lurching wildly about. He later said it was like flying an Immelmann turn in an aircraft, a combination of pitch and yaw. Stafford yelled that they were in gimbal lock - that the engine had swiveled over to a stop and stuck - and they almost were. He called out for Cernan to thrust forward. Stafford then hit the switch to get rid of the descent stage and realized they were 30 degrees off from their previous attitude. The lunar module continued its crazy gyrations across the lunar sky, and a warning light indicated that the inertial measuring unit really was about to reach its limits and go into gimbal lock. Stafford then took over in manual control, made a big pitch maneuver, and started working the attitude control switches.
Snoopy finally calmed down