LANDING IN 717 , 727, 737, 747 ,A330 AND A330 A330

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Re: how fast are you meant to hit the ground landi

Postby Hagar » Tue Apr 05, 2005 4:48 am

Landing either of those big d-wings must be a real nail-biter, esp. since the engines are underslung at the trailing edge of the wing... a very expensive boo-boo just waiting to happen! :-X

It might look a tad dodgy to the unitiated eye but I don't recall a single landing incident with Concorde over almost 30 years it was in regular service. A RAF Vulcan crashed many years ago during the approach to Heathrow. This was on its return from Australia after setting a new world record & it had special permission to land at Heathrow. As I recall the fatal accident was due to the very senior but inexperienced (with the Vulcan & the airport) pilot making basic flying errors. Not being familiar with Heathrow wouldn't have helped but there was a reception committee laid on which might have influenced his decision to attempt the landing.

Delta winged aircraft usually have very stable flying characteristics at extremely high angles of attack & low airspeed with no tendency to tip-stall. I've flown delta-winged model gliders & found them impossible to stall, even with full up elevator. In most cases they mush while gradually losing altitude.

PS. [quote]In 1956, with the introduction of the V-Bombers and the rapid response needed to effect a creditable deterrent, it was decided to staff Bomber Command with personnel having some ex-Fighter Command experience.
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Re: how fast are you meant to hit the ground landi

Postby C » Tue Apr 05, 2005 1:57 pm

The Concorde had no flaps & I'm not sure it has airbrakes.


You're quite right Doug. Instead of having airbrakes like the Vulcan, the Concorde did have reverse thrust. I can imagine they had those instead of a braking parachute to keep turn-around times to a minimum, and decrease labour costs too (retrieving and packing parachutes)...
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Re: how fast are you meant to hit the ground landi

Postby ChrisM » Wed Apr 06, 2005 3:03 am

Hagar
The landing procedure for delta-winged aircraft is completely different from conventional aircraft. The high angle of attack is necessary to keep the speed down. Delta wings are very stable at slow speeds & high angles of attack & will not stall in the usual sense. The Concorde had no flaps & I'm not sure it has airbrakes. The Vulcan has airbrakes (not sure about flaps) but unlike the Concorde normally deploys a braking chute after touching down.
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Re: how fast are you meant to hit the ground landi

Postby Hagar » Wed Apr 06, 2005 3:23 am

[quote]Hagar
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Re: how fast are you meant to hit the ground landi

Postby C » Wed Apr 06, 2005 3:24 pm

I have no idea of the vertical speed of Concorde or any other delta-winged aircraft during approach & landing


This just occured to me. Surely when landing, the vertical speed is in fact 0 fpm*, unless you're on a soft surface or water... ;) ;D

*instantaneously... ;)
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Re: how fast are you meant to hit the ground landi

Postby Hagar » Wed Apr 06, 2005 4:12 pm

This just occured to me. Surely when landing, the vertical speed is in fact 0 fpm, unless you're on a soft surface or water... ;) ;D

Clever clogs. :P That's what I was trying to point out in my first reply. ::) ;D
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Re: how fast are you meant to hit the ground landi

Postby beaky » Wed Apr 06, 2005 9:09 pm

Not to be "that way" but even the most gentle landing has a sinking component to it, however small. That's why landing gear always has some springiness to it- to absorb the energy. There's always that moment when the mass of the plane is still coming down, even after the wheels touch. And if the nosewheel oleo is going south, that moment occurs again and again, until you climb out! :D
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Re: how fast are you meant to hit the ground landi

Postby Saratoga » Wed Apr 06, 2005 10:05 pm

Two things. a) delta wings do not stall under any conditions. They just run out of lift. No shaking or sudden drop like for example, a Cessna.
b) Concorde's inboard two thrust reverses were deployable in flight (would rip the engines off any modern plane) to allow for some airbraking. Imagine that! :o
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Re: how fast are you meant to hit the ground landi

Postby OTTOL » Wed Apr 06, 2005 10:52 pm

"O, the Lord of Law on the Throne of Thought........."  
....you might wanna rethink that one ?.?.  ::)
.....so I loaded up the plane and moved to Middle-EEEE..........OIL..that is......
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Re: LANDING IN

Postby cobzz » Sat Apr 09, 2005 5:27 am

SOZ people, i am talking about conventional Airliners like
717 , 727, 737, 747 ,A330 AND A330

thanks for the replys :-*  ;D :D :) ;)
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Re: LANDING IN 717 , 727, 737, 747 ,A330 AND A330

Postby Alphajet_Enthusiast » Fri May 20, 2005 2:30 am

I was in the cockpit of a 737 thanks to a pilot friend of ours... I think we landed at 134 kts. Didnt concentrate on the v/s though...
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Re: LANDING IN 717 , 727, 737, 747 ,A330 AND A330

Postby jknight8907 » Sat May 21, 2005 8:05 pm

Your average airliner doesn't flare more than a few degrees. And touchdowns are intentionally made a bit firm. That's so that all the squat switches contact, and ensures that spoilers and autobrakes will deploy, and that the reversers will unlock. A greased-on landing may not unlock reversers or spoilers, which would be very bad.
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