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  #3601  
Old 07-05-2014, 07:51 AM
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Re: WK2 DownUnder

Plane takes off. Maybe a bit of bump when the plane goes over the end of the conveyor though....


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  #3602  
Old 07-05-2014, 03:32 PM
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Re: WK2 DownUnder

On the CV Boot issue again, is a visual inspection enough to tell if the CV boot is faulty or do you have to wait for it to start leaking grease.
The reason I ask is my new Laredo is a 2/4 build which puts it in the period where the faulty boots were fitted.
We are leaving on a long trip soon and I am fairly concerned about them failing on the trip and having to wait for weeks for replacements.
The dealer " Claims" he checked them pre delivery but that does not instill much confidence.
I am considering having them independently checked out.
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  #3603  
Old 07-05-2014, 07:26 PM
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Re: WK2 DownUnder

I didnt check mine and only noticed when I saw the grease on the wheels.
If the boot does fail you can still drive it.
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  #3604  
Old 07-05-2014, 09:14 PM
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Re: WK2 DownUnder

Maybe just try rotating the boot?

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  #3605  
Old 07-05-2014, 09:47 PM
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Re: WK2 DownUnder

Quote:
Originally Posted by jskf01 View Post
anyone know if there is any difference in the performance of the 3.6L engines between vehicles that have one exhaust pipe and those that have two? Referring to MY14 4x4 models only. I notice some have 1 exhaust like Laredo but Limited have 2.
It is highly unlikely that there would be any measurable difference but you could check with the published power specs. If you look under the car, you'll probably find a single exhaust pipe running to the back then splitting in two. The two tail pipes is intended to give the impression that each bank of the V6 has its own exhaust system as one might expect in high performance cars. It is not uncommon to see models go from one tail pipe to two to four and back to one again purely for product definition purposes.
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  #3606  
Old 07-07-2014, 08:07 PM
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Re: WK2 DownUnder

Quote:
Originally Posted by vl_bt1 View Post
The plane would move. The engines generate thrust on the surrounding air which isn't influenced by the conveyor belt. The wheels turning on the conveyor belt and the speed is irrelevant.
The riddle specifically says that the conveyor belt has a control system that prevents the speed of the plane being any greater than the speed of the conveyor belt in reverse. So the conveyor belt does influence the wings movement through air. Without air movement over the wing the plane cannot take off, unless it is a jumpjet or a tilt-rotor, etc.
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  #3607  
Old 07-07-2014, 08:40 PM
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Re: WK2 DownUnder

Ughhh... not this again. It's like hanging out with the Dungeons and Dragons crew in the Science Lab during lunch break.
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  #3608  
Old 07-07-2014, 09:11 PM
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Re: WK2 DownUnder

Hey.... you were the brainiac who knew what CV stood for
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  #3609  
Old 07-07-2014, 10:31 PM
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WK2 DownUnder

Nope. The presence of a conveyer makes no difference. The engines (and aircraft) will move relative to the AIR mass in which they sit, provided the engines are developing sufficient thrust to move the mass of the aircraft from rest.
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  #3610  
Old 07-07-2014, 10:38 PM
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Re: WK2 DownUnder

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Originally Posted by Jarse View Post
Nope. The presence of a conveyer makes no difference. The engines (and aircraft) will move relative to the AIR mass in which they sit, provided the engines are developing sufficient thrust to move the mass of the aircraft from rest.
This breaks a specification of the riddle:

This conveyor has a control system that tracks the plane speed and tunes the speed of the conveyor to be exactly the same (but in the opposite direction).

The engines provide forward movement, the wings provide upward lift, which only happens with forward movement (ie air passing over them at a certain speed). The riddle says forward movement is prevented by the design of the conveyor belt.
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  #3611  
Old 07-08-2014, 12:19 AM
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Re: WK2 DownUnder

Quote:
Originally Posted by Benn0 View Post
This breaks a specification of the riddle:

This conveyor has a control system that tracks the plane speed and tunes the speed of the conveyor to be exactly the same (but in the opposite direction).

The engines provide forward movement, the wings provide upward lift, which only happens with forward movement (ie air passing over them at a certain speed). The riddle says forward movement is prevented by the design of the conveyor belt.
link to original riddle?

Lift is not generated by forward movement, it is generated by airflow over an aerofoil.

The only way for the "conveyor" to prevent the plane from moving forward, if the engines are producing thrust and if the plane is not physically locked to something, is to accelerate the air, as I mentioned earlier. If this occurred, even if the plane isnt moving relative to the conveyor, it IS moving relative to the airflow, and once it reaches a certain AIR speed the plane will move relative to the conveyor- upward as its wings generate enough lift to over come gravity.


Edit: That specification is irrelevant, the conveyor only influences the speed at which the wheels turn, which has no forward drive components for the aircraft, they are to facilitate landing and breaking. There would be drag of the bearings involved, but that would be miniscule compared to the thrust from the engines
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  #3612  
Old 07-08-2014, 12:41 AM
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Re: WK2 DownUnder

Quote:
Originally Posted by vl_bt1 View Post
link to original riddle?

Lift is not generated by forward movement, it is generated by airflow over an aerofoil.

The only way for the "conveyor" to prevent the plane from moving forward, if the engines are producing thrust and if the plane is not physically locked to something, is to accelerate the air, as I mentioned earlier. If this occurred, even if the plane isnt moving relative to the conveyor, it IS moving relative to the airflow, and once it reaches a certain AIR speed the plane will move relative to the conveyor- upward as its wings generate enough lift to over come gravity.


Edit: That specification is irrelevant, the conveyor only influences the speed at which the wheels turn, which has no forward drive components for the aircraft, they are to facilitate landing and breaking. There would be drag of the bearings involved, but that would be miniscule compared to the thrust from the engines
Airflow over the aerofoil is a result of forward movement (unless there is a cyclone in progress).

There are many ways a conveyor belt can 'prevent' a plane moving forward, it may have cables holding the wheels, or some kind of brake mechanism on the wheels, it isn't important, the riddle just says this is a fact that it has this feature.

And now you are touching on the bit of the question that is ambiguous, what does it mean by speed? Ground speed measured at the wheels, or wind speed? If you measure speed at the wheels then nothing happens, if you measure wind speed then the plane moves forward at 200kph, the conveyor moves back at 200kph and the wheels spin at 400kph and the plane takes off.

There are a number of versions of the riddle, one specifically says speed at the wheels, another just says speed. If you google it you will come across pages and pages of views and calculations. Which ones you agree with will depend on your approach to solving it. The real answer is there is no answer....
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