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Loads Acting on an Aircraft During Deck Landings.

10/18/2016 1:36 PM

i'm doing a project on carrier landings of aircrafts. so i want to know when an aircraft lands on aircraft carrier what all forces acts on it??

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#1

Re: Loads acting on an aircraft during deck landings.

10/18/2016 1:52 PM

You claim to be doing a project on carrier landings but you want us to tell you all of the forces acting. Well the fundamental forces are gravity, weak, electro-magnetic and strong force. I lead the student to explain how these forces are relevant.

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#2

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 2:41 PM

Start by searching for, "forces exerted on aircraft during carrier landings"

This is no a homework help site.

Do your own homework.

How to Search the Internet Effectively | MediaSmarts

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#3

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 3:22 PM

Welcome to CR4, a place for ....

Mass weight of said aircraft (+) speed of said aircraft (+) resistive load of arresting cable (=) forces applied.

Do your own homework

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#4

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 3:26 PM

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#5

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 3:44 PM

Naval forces.

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#9
In reply to #5

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 6:35 PM

Good answer but it was unnecessarily wordy. I would have placed the period after Naval and been done with it.

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#6

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 3:50 PM

...and don't forget the force of the wave action on the deck! Good Luck!

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#7
In reply to #6

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 4:30 PM

They shouldn't forget about the sudden rotational torque on the wheels of the landing gear. I don't think anybody mentioned the kinematics of catching an arresting cable with the tail hook or the forces needed to "stop" a plane by the arresting cable and tail hook.. (Well not fully stop, the boat is moving.) Remember too that the plane has to be able to safely abort a landing. when things miss.

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#8
In reply to #7

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 4:33 PM

I forgot to mention that all of these tail hook forces pale in comparison to the role played by the strong forces in this.

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#10

Re: Loads Acting on an Aircraft During Deck Landings.

10/18/2016 11:04 PM

Harman

First welcome to CR4... and your baptism by fire, as you unwittingly got on the wrong side of the 'old farts' (including me) who trolls this site, and we don't do homework.

What we will do, is help you to understand what you have to find out yourself, as we all had to learn the hard way as nothing came easy, it was not handed to us on a plate and we didn't have the internet to help, you do!

Oh.. one other thing! Manners! I'm sure you were taught, "please and thank you", it goes a long way on here too!
Ask politely, do not demand!

Best of luck with your project

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#11

Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 6:52 AM

I find it interesting that you ask about the forces on the aircraft carrier. This should be somewhat easier to explain than the forces on the aircraft. Good luck with your endeavors.

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#12
In reply to #11

Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 9:12 AM

Are you being snarky about his indeterminate grammar, or did you deliberately ignore the title of the post?

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#14
In reply to #12

Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 9:36 AM

Definately snarky. I will admit to sometimes being in a hurry and not arraigning sentence structure well.

Also, how many of us have been lured into meetings under a false premise with what we thought would be a relevant title?

But mostly snarky.

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#13

Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 9:15 AM

Gravity is the force acting on the aircraft during any landing!

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#28
In reply to #13

Re: Loads Acting on an Aircraft During Deck Landings.

12/15/2016 1:02 PM

in the absence of lift!

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#15

Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 10:24 AM

Resolve your own vectors, grasshopper. There are several of them at play in this problem.

You can answer then for yourself why a carrier aircraft has such robust legs (landing gear).

Any landing on a carrier you can walk away from is a "good" landing. All of them are controlled crashes. Some more than others. All of the successful (and unsuccessful) landings end rather abruptly.

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#16
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Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 10:43 AM

Most people have probably heard this, however, an old pilot one told me, "A good landing is one you walk away from. A great landing is when you can still use the aircraft."

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#17
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Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 11:10 AM

Yes, and from what I have been told, when you are in WWII, piloting an F4F Wildcat, maintaining radio silence, and searching for that little dot in the wide Pacific, it can be a real homesick feeling, there is only so much fuel left, so much daylight, and so much good weather.

Then once you find it, you hope your indicators are working, the hook is down, and both wheels deployed. You have to crab the landing on the last part, but that is part of the standard approach to a carrier, where one flies across the path of the bow, circles anticlockwise from above, then you bank that final turn to line up a short approach, keeping your nose up just enough to miss the fantail, and come down on the second wire.

Perhaps the greatest stimulus in those days in favor of an excellent landing was fear of the sharks, especially if even slightly wounded.

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#18

Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 4:39 PM

ESDU may have information on this, but it usually requires a subscription.

They do have some free apps, but they may not apply to your problem.

https://www.esdu.com/toolbox

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#19

Re: Loads Acting on an Aircraft During Deck Landings.

10/19/2016 4:50 PM

Perpendicular to the deck it will be something over 100% of the force due to the weight of the aircraft.

Parallel to the deck it will be something over 100% of the force due to the maximum deceleration of the aircraft, as the restraint gets picked up by the hook at the tail. That force acts on two bearing points that are off the centre line of the aircraft, so the secant of the angle of the bearing point relative to the aircraft is in the equation somewhere.

Good luck with developing things further.

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#20

Re: Loads Acting on an Aircraft During Deck Landings.

10/20/2016 2:21 PM

The U.S. Navy has load envelops it requires for naval aircraft system designs. I don't know if they are publicly available.

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#21
In reply to #20

Re: Loads Acting on an Aircraft During Deck Landings.

10/20/2016 2:27 PM

They are probably available on that Russian hacker's website.

DT can get them for you, he's friends with the predident

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#22
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Re: Loads Acting on an Aircraft During Deck Landings.

10/20/2016 2:53 PM

Should be highly classified. That is one reason why I don't talk about current model Navy Aircraft, the other reason is I don't know a damp thing.

But Kudos to the Navy, my dad was in the Navy between WWI and WWII, and was on a cruiser as engineman/fireman (classification obsolete), and did witness the first airplane catapulted off a military vessel. He lived long enough to see Americans land on the moon, and also the last Apollo Mission (17), but unfortunately did not live long enough to witness the first Space Shuttle Mission in 1981.

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#23

Re: Loads Acting on an Aircraft During Deck Landings.

10/20/2016 7:37 PM

I'd choose a helicopter landing.

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#24
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Re: Loads Acting on an Aircraft During Deck Landings.

10/21/2016 12:25 PM

Have you seen any of the landings viewed from the cockpit of a helicopter on the back of a ship pitching in heavy seas? Hint - you cannot see the deck below you at all.

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#25

Re: Loads Acting on an Aircraft During Deck Landings.

11/04/2016 5:42 PM

I spent 10 years on aircraft carriers. Aerospace Maintenance Duty Officer. Aircraft Maintenance, all aircraft from the Helos to the E2C Hawkeye, Greyhound, and all the tactical aircraft to include A-7 Corsair II, A-6 Intruder, F-14, F/A-18, EA6B Prowler, S-3, and a few others.

First, a "perfect" landing is called an "OK 3-Wire". The 3rd of the 4 arresting wires is the target, not the 2nd wire.

Second, as soon as the hook hits (slams) the deck, the aircraft is put to full throttle.

The arresting hook on the aircraft has a damper to prevent hook-skip, or bouncing.

When the aircraft catches the wire, under full power, the arresting gear causes the nose of the aircraft to slam down. So, the aircraft structure has the hook slam, the hook pull, the main gear slam, then the nose gear slam (under full power), then the aircraft comes to a stop under full power. Only then does the pilot back off on the throttle.

That's why Navy aircraft are heavier than the Air Force counterparts, and also why we can't just make one tactical fighter or strike aircraft for both services.

Good luck figuring out the forces....to quantify them, you will need to pick an aircraft, and decide on its fuel state in order to put numbers to the forces. Then, to be truly accurate, decide whether the deck is going down or up during the landing.

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#26
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Re: Loads Acting on an Aircraft During Deck Landings.

11/07/2016 8:50 AM

Nicely done, sir! Thank you for your service! (in all senses of that sentence)

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#27
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Re: Loads Acting on an Aircraft During Deck Landings.

11/07/2016 11:39 AM

I'll second that statement.

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