how jet planes land????????

[turbolium]

I remember we have some guys here who likes planes so i figured maybe you can give me some info

me and my friend got into discussion long time ago about what planes use to brake then landing? i did search internet for the answer but they are all vague, anyway the main question do jet planes use JETS / TURBINES to stop them? or they are only using flaps and brakes? i emailed the same question today to Boeing just for fun but don't think they will take it serious ))))

Thanks

[rkawakami]

If the question is how do jets slow down once they have landed, then I think the answer is "reverse thrust":

http://cobweb.ecn.purdue.edu/~propulsi/ ... verse.html
http://en.wikipedia.org/wiki/Thrust_reverser
http://www.avtrial.com/thrust-reversers.html

[GomJabbar]

Well, I am certainly not an expert on the subject, but I have flown a number of times. I notice on at least some jet aircraft, there are flaps that come down behind the engines to reverse the thrust when the aircraft is landing. At some point you will hear the engines rev up to increase the reverse thrust to slow the aircraft down more quickly. Of course there are brakes in the landing gear as well.

[turbolium]

Thanks

[censored] this gets more complicated since at the end both of us lose
We didn't clarify what we were talking about, stopping or slowing down (((( but good to know that all moder jet planes have revers thrust

[rkawakami]

During my quick scan on the subject I read that not all jet airplanes have reverse thrust cowlings around the engines. The BAe 146 does not use them since it relies on speed brakes (flaps).

http://en.wikipedia.org/wiki/BAe_146

Reverse thrust alone is not used to slow down or stop the plane. Spoilers and brakes are utilized as well.

[bill bolton]

Related to planes stopping quickly when landing, there is an old saying amongst aviators about that:

There are only two types of pilots of retractable undercarriage aircraft.....

• those who have landed once with the wheels retracted
  
  those that haven't yet!

Cheers,

Bill B.

[skitty4gzus]

all types of planes use landing gear wheel mounted braking. depending on weight, speed, power, etc.... you also have reverse thrust, aileron positioning.
@Bill- I do know a friend of our ministry that has landed his jet prop with the landing gear retracted. Needless to say that jet was completely totalled, but he wasn't hurt, thank God.

[NS]

Aren't there any brake pads in the wheels on the planes? Who has flown a plane? Maybe James (captain JHEM) knows more about this. If i am not wrong, i think he has flown a plane before.

This is a very interesting question. I am doing google searches now.

EDIT: http://www.bootsnall.com/guides/05-06/h ... ickly.html

[mattbiernat]

Needless to say that jet was completely totalled, but he wasn't hurt, thank God.

i think most planes are designed to allow safe belly landing.

[qviri]

@Bill- I do know a friend of our ministry that has landed his jet prop with the landing gear retracted. Needless to say that jet was completely totalled, but he wasn't hurt, thank God.

What's a jet prop?

[bill bolton]

What's a jet prop?

The technical term is a turboprop engine, but its often referred to as a prop jet or jet prop.

See http://en.wikipedia.org/wiki/Turboprop

Cheers,

Bill B.

[jamerslong]

seeing as how i work on aircraft i can give a decent description on the heavys use based on what ive learned about the flight control system.

When a heavy (e.g. Boing 707) aircraft lands it must slow down to 200 to 150 Mph and provide a steady drop. these jets like to drop like a rock at these speeds and this is where the Flaps come into play, flaps drop at the rear of the wing right next to the ailerons (used for rolling) when down they provide extra lift by directing the air downward, and they provide drag. the aircraft is positioned into landing position while on approach which is usually nose up around 15-30 degrees and the spoilers are raised to around 20-40 degrees. the spoilers disrupt the air flow over the wings and causes the plane to drop so this lets them drop without adjusting pitch. if youve ever felt an aircraft ubruply drop in altitude and your stomach come up to your throat then the pilot brought the spilers up too high and too fast.

so essentially the plane is put into position brought down to speed and the flaps are dropped to essentially make the plane drop slowly, if extra drop is needed they then raise the spoilers.\

once the aircraft is landed they slow down the jet using thrust reversers, they take the engine exhaust and basically redirect it the opposite direction through ports on the side of the jet AND with the use of brakes, and the brakes suck to change.

[rkawakami]

You forgot about the Navy option... tailhook and arresting wire! Absolutely no brakes or reverse thrust needed!

[BillMorrow]

You forgot about the Navy option... tailhook and arresting wire! Absolutely no brakes or reverse thrust needed!

i don't think flaps, reverse thrust (if available on a fighter jet), brakes or all of the preceeding would do much good on a short flight deck..
without that wire the plane would be off the far end and either need to go around again or float..

[mattbiernat]

ty for the clerification jamerslog.

[jamerslong]

no problem. it's the best i can explain it

i dont think fighters have thrust reverser's, they aren't very heavy i don't think they even have flaps. just spoilers.

[skitty4gzus]

while belly landing is an acceptable emergency procedure, not all aircraft recover from this type of landing. Not all aircraft in flight are brand new machines worth repairing. Our ministry jet is 40+ year old Westwind, and while that is a nice jet, if it took an emergency belly landing for any reason it would be a complete loss. A jet that heavy and that long with that much surface area would suffer too much damage to the airframe to be repairable. oh and fyi, a belly landing on solid surface is always preferred if available. also, the wildest part of carrier landing's to me is they have to land under full power in case they miss the arrest line.