Page 1 of 100 1231151 ... LastLast
Results 1 to 15 of 1492

Thread: The Technical Questions Thread

  1. #1
    Join Date
    Jun 2005
    Location
    East Coast of the United States
    Posts
    11,650

    The Technical Questions Thread

    I don't want to start a new thread each time I think up of a technical question, so I'll start this thread. Sometimes, random things trigger these questions and I can't stand not having an answer.

    So far, I only have one question, but I'm sure more will come.

    Last night there was a mighty big thunder storm (it actually woke me up, so it's pretty big) and I decided to watch it. So, I saw a couple of airplanes go by actually, while the big thunder bolts were flying. My question is, how do planes keep themselves from getting zapped?
    Last edited by cmcpokey; 02-22-2009 at 12:43 AM.

  2. #2
    Join Date
    Nov 2004
    Location
    UK
    Posts
    2,734
    Lightning tries to find the easiest route down to the ground, and I would have thought that striking a plane wouldn't help it in that sense, but I'm sure someone can give you a better answer!
    How can men use sex to get what they want?
    Sex is what they want. - Frasier

  3. #3
    Join Date
    Aug 2005
    Location
    New York City
    Posts
    2,057
    lol! oh man good answer. i guess it's kinda like striking a car
    Gone:
    09 Ducati Monster 696
    09 Audi Q5 3.2
    03 Infiniti G35 Sedan
    07 Honda Civic Coupe LX 5spd

    Current:
    10 BMW 335d
    12 Audi Q5 2.0t
    10 VW Jetta TDI
    11 Ducati Monster 796

  4. #4
    Join Date
    Sep 2004
    Location
    Perth, Australia
    Posts
    3,560
    Planes do get zapped, and regularly.

    It does affect them, but as they are not earthed it is not normally critically damaging.
    Chief of Secret Police and CFO - Brotherhood of Jelly
    No Mr. Craig, I expect you to die! On the inside. Of heartbreak. You emo bitch

  5. #5
    Join Date
    Jun 2005
    Location
    East Coast of the United States
    Posts
    11,650
    Quote Originally Posted by Cyco View Post
    Planes do get zapped, and regularly.

    It does affect them, but as they are not earthed it is not normally critically damaging.
    It isn't grounded, so it's safer that way? That doesn't make sense. Lightning rods are grounded for a reason. Can someone explain this to me? I absolutely suck at electricity.

    I see. It must be really scary to be in a plane and have a major thunderstorm happen all around you.

    The electronic components can potentially still fail though, right? I don't know how much energy it packs, but it's a heck of a lot for a flying aluminum can, especially when it's loaded with fuel.

  6. #6
    Join Date
    Apr 2004
    Location
    Stop looking at me! Look at me! Stop looking at me!
    Posts
    1,873
    http://www.usatoday.com/travel/colum...-captain_x.htm

    It has been decades since commercial airlines sustained any real damage from a lightning strike, even though statistically airliners experience an average of one to two strikes per year per plane. You would probably be hard-pressed to find an experienced pilot who hasn't experienced at least one or more strikes somewhere along the way.

    Lightning strikes on aircraft occur when negatively charged electrons encounter positive charges from the surface of the plane, and when they do, ZAP!—lightning occurs. Airplanes create charges in both directions and act as a conduit for lightning.

    There are stringent FAA requirements for lightning certification. Surge protectors and shielding are installed to protect avionics.

    So what happens when lightning actually strikes the airplane? It's important to note that lightning has one mission in life and that is to find a path to the ground. It usually strikes an extremity like the nose or wingtip, and from there it passes harmlessly around the outside of the aircraft and exits off the back of the wings with the help of "static wicks."

    Static wicks don't prevent lightning strikes but give the electrical charges an easy exit point. There are a minimum number of static wicks required to be on the airplane and if any are missing, they must be replaced before flight.



    Hope that answers your question!
    I dont if I'll make home tonight
    But I know I can swim
    under the Tahitian moon

  7. #7
    Join Date
    Jun 2005
    Location
    East Coast of the United States
    Posts
    11,650
    Thank you very much. So it just slides around the airplane.

  8. #8
    Join Date
    Aug 2004
    Location
    IA
    Posts
    467
    Quote Originally Posted by NSXType-R View Post
    Thank you very much. So it just slides around the airplane.
    Lighting is more of an issue on aircraft that use non-conductive composite structures. For these aircraft a conductive path has to be added, such as a wire mesh over the composite parts.

    Without a low resistance path the lightning could potentially create holes in the material or worse.
    "In theory, theory and practice are the same. In practice, they are not."

  9. #9
    Join Date
    Oct 2006
    Posts
    10,094
    Hijack time.

    Why does this engine have the 6 exhausts or whatever the chrome things are in a row when it is a V6? Wouldn't it be more normal to have three on each side? Am I crazy? Is this peculiar in any way? Help!
    Attached Images Attached Images

  10. #10
    Join Date
    Mar 2004
    Location
    Eindhoven, The Netherlands
    Posts
    7,827
    Quote Originally Posted by Kitdy View Post
    Hijack time.

    Why does this engine have the 6 exhausts or whatever the chrome things are in a row when it is a V6? Wouldn't it be more normal to have three on each side? Am I crazy? Is this peculiar in any way? Help!
    I'd say it has two exhaust valves per cilindre and therefor one pipe for each valve...

  11. #11
    Join Date
    May 2005
    Location
    UK
    Posts
    3,161
    Quote Originally Posted by Kitdy View Post
    Hijack time.

    Why does this engine have the 6 exhausts or whatever the chrome things are in a row when it is a V6? Wouldn't it be more normal to have three on each side? Am I crazy? Is this peculiar in any way? Help!
    The chromed pipes are the induction pipes, not the exhaust. You can just about see the exhausts on the nearside bank of cylinders, the red curved pipes below the cylinder head cover, and it will indeed have three exhausts on each side.
    uәʞoɹq spɹɐoqʎәʞ ʎɯ

  12. #12
    Join Date
    Nov 2006
    Location
    Aberdeen
    Posts
    2,976
    Actually the 6 intake pipes leave from a common plenum and go down into the V6 to deliver an inlet to each combustion chamber as in:


    This is a very pretty engine!
    autozine.org

  13. #13
    Join Date
    Jun 2005
    Posts
    4,032
    Quote Originally Posted by Kitdy View Post
    Hijack time.

    Why does this engine have the 6 exhausts or whatever the chrome things are in a row when it is a V6? Wouldn't it be more normal to have three on each side? Am I crazy? Is this peculiar in any way? Help!
    Those 6 eye-appealing tubes are part of the induction system, they each feed down into a continuation of separated ducts (moulded internally in the intake manifold, situated between the 'V') which distributes the intake flow left/right into each respective cylinder

  14. #14
    Join Date
    Mar 2005
    Posts
    1,508
    For their next trick they can explain why this V6 has 12
    http://www.members.cox.net/rdgrauman/finiahed2.jpg

    (PS, the 2.5L Ford Duratec V6 has 12 for the same reason)
    http://www.supercars.net/servlets/PW...esey/4car1.jpg sorry the engine is a bit dirty in this picture

  15. #15
    Join Date
    May 2005
    Location
    UK
    Posts
    3,161
    Quote Originally Posted by culver View Post
    For their next trick they can explain why this V6 has 12
    http://www.members.cox.net/rdgrauman/finiahed2.jpg

    (PS, the 2.5L Ford Duratec V6 has 12 for the same reason)
    http://www.supercars.net/servlets/PW...esey/4car1.jpg sorry the engine is a bit dirty in this picture
    Variable length intake manifolds.

    There is a long and a short pipe for each individual cylinder, and the intake switches between the two depending on revs - long pipe for low revs and short pipe for higher revs (I think!).
    uәʞoɹq spɹɐoqʎәʞ ʎɯ

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. The random picture thread
    By Mustang in forum Multimedia
    Replies: 489
    Last Post: 05-16-2014, 02:19 PM
  2. The "What car is it?" thread
    By The_Canuck in forum Miscellaneous
    Replies: 16
    Last Post: 10-07-2005, 01:28 PM
  3. lukehow and Robb Mann thread
    By Matra et Alpine in forum Miscellaneous
    Replies: 43
    Last Post: 12-12-2004, 06:54 PM
  4. About the enzo thread
    By werty in forum Website discussion
    Replies: 22
    Last Post: 09-19-2004, 04:03 PM
  5. Changing thread name
    By Rijoh in forum Website discussion
    Replies: 2
    Last Post: 07-11-2004, 07:33 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •