Ask The Pilot. - Page 616

 
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Originally Posted by jb747 The blades are not as rigidly attached as you might imagine. They are generally connected to the hub by a system called a fir tree root ...
  1. #6151
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    Re: Ask The Pilot.

    Quote Originally Posted by jb747 View Post
    The blades are not as rigidly attached as you might imagine. They are generally connected to the hub by a system called a fir tree root (type it into google and have a look at the images). As I understand it, this system allows for thermal expansion, as well as doing good job of spreading the loads. It also means that the blades can easily be removed if needed. So, when not spinning, and with no centrifugal force to lock things up, they rattle around.
    you touched on it with the centrifugal force - as well as thermal expansion it allows for creep in the blades (where they stretch out due to the forces from spinning quickly). That creep is also a factor in calculating the gap at the end of the blade.

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    Posting Enthusiast MEL_Traveller's Avatar
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    Re: Ask The Pilot.

    Quote Originally Posted by jb747 View Post

    But, if the wind were so strong that you could hover...then it would be a really good time to go to another airfield.
    on a related matter - not sure if this video footage has been posted here before? An empty 747's nose is lifted off the ground by strong winds:

    https://www.youtube.com/watch?v=cHhZwvdRR5c

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    Re: Ask The Pilot.

    Quote Originally Posted by MEL_Traveller View Post
    on a related matter - not sure if this video footage has been posted here before? An empty 747's nose is lifted off the ground by strong winds:

    https://www.youtube.com/watch?v=cHhZwvdRR5c
    It would be interesting to know where the 747s CofG was. Move it aft enough, and they'll sit on their tail without any wind at all.

    I expect that the CofG was very aft. The lack of engines would have affected that. I don't think the fact that the slats and/or flaps were out made much difference.

    The tail normally produces negative lift...i.e. it pushes down. Depending upon just where the trimming tail was positioned, it most likely wouldn't have needed to produce much of that negative force to make the aircraft sit up as it does in the video. Basically, I think it wasn't far from sitting on it's tail anyway, so add a bit of a push on the tail and up it goes.

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    Re: Ask The Pilot.

    Quote Originally Posted by jb747 View Post
    Basically, I think it wasn't far from sitting on it's tail anyway, so add a bit of a push on the tail and up it goes.
    Either that or it's haunted...

    alieninperth and Dmac6345 like this.

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    Re: Ask The Pilot.

    JB747 - I did a couple of flights (NRT-SIN and SIN-SYD) this week on SQ's 380's. Apart from a couple of short SIN-KUL hops I hadn't flown on SQ for a number of year. During both flights the Captain took a walka through the upper deck of the plane. One thing I noticed was that both were wearing a pair of white gloves. I can appreciate military pilots wearing gloves for various reasons however I was under the impression this was an urban myth in the commercial world. Do some commercial Pilots wear gloves? If so is there any particular reason.

    Thanks in advance.

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    Senior Member jb747's Avatar
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    Re: Ask The Pilot.

    Quote Originally Posted by ChrisGibbs View Post
    JB747 - I did a couple of flights (NRT-SIN and SIN-SYD) this week on SQ's 380's. Apart from a couple of short SIN-KUL hops I hadn't flown on SQ for a number of year. During both flights the Captain took a walka through the upper deck of the plane. One thing I noticed was that both were wearing a pair of white gloves. I can appreciate military pilots wearing gloves for various reasons however I was under the impression this was an urban myth in the commercial world. Do some commercial Pilots wear gloves? If so is there any particular reason.
    An occasional pilot would, but very rare. Unless you have particularly sweaty palms, I don't see any reason. I think JAL might, as part of their uniform.
    Last edited by jb747; 20th June 2014 at 11:45 PM.
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    Re: Ask The Pilot.

    I think JAL might, as part of their uniform.
    And given extensive ground school courses on how to wear them.

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    Re: Ask The Pilot.

    Quote Originally Posted by jb747 View Post
    A very occasional pilot would, but very rare. Unless you have particularly sweaty palms, I don't see any reason. I think JAL might, as part of their uniform.
    I jump seated on a bird seed 744 and the captain wore gloves.

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    Re: Ask The Pilot.

    Quote Originally Posted by markis10 View Post
    I jump seated on a bird seed 744 and the captain wore gloves.
    There's a tale within QF about a Captain who wore gloves, and a particularly colourful FO who decided to take the piss by wearing the aircraft fire fighting gloves.
    Last edited by jb747; 20th June 2014 at 11:56 PM.
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    Re: Ask The Pilot.

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    Quote Originally Posted by Boris spatsky View Post
    I have seen two this month - a green laser on approach to Melbourne got me in the eye and i was off flying for a few days with an inflamed retina. It's just criminal in my opinion. It is beyond me why you would want to point one at an aircraft...

    I would add stupid to the labels, especially a 50 year old lighting up polair.

    Police have charged an Arundel man with offences committed under the civil aviation act following an incident on the Gold Coast last night.


    It will be alleged that around 7.45pm the police helicopter was conducting airborne patrols of the Gold Coast area when the crew noticed a laser light being shone on them from outside a residence in Fadden Close, Arundel.


    The helicopter crew reported the alleged incident and police attended the Fadden Close address where a 50-year-old man was spoken to in relation to the matter.


    He was issued with a notice to appear in the Southport Magistrates Court at a later date.

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