Page 10 of 10 FirstFirst ... 345678910
Results 118 to 130 of 130
  1. #118
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793

    Prop,

    that statement makes no sense! Lets paint by the number here;

    Lets say we have a plane in flight, two molecules of air hit the front of the wing. One molecule goes over the top of the wing while the other goes underneath the wing.
    The speed inwhich the two molecules travel have been predetermined by the engine and propeller. At this given speed are you saying that the two molecules reach the rear of the wing at the same time simply by having the molecule over the top of the wing go faster?

  2. #119
    Join Date
    Oct 2005
    Posts
    922

    Topic

    Don’t loose focus we are talking about the importance of return air? Not fully understanding is not a reflection on mechanical ability. This is more of a design factor but a very important one. That is if you want the system to work efficiently and with as little undue stress as possible.I like this site because I learn.

    Static pressure, fan blade shape, duct shape and size, turning veins, all have an impact on the system. Bernoulli’s law is in important part of understanding.

    It would be like working on a steam boiler but not knowing how steam is made or what temperature is used.

    What do you think? Does high pressure steam move faster or slower then low pressure steam and why or why not.

  3. #120
    Join Date
    Apr 2002
    Posts
    11,808

    Re: Prop,

    Originally posted by air2spare
    that statement makes no sense! Lets paint by the number here;

    Lets say we have a plane in flight, two molecules of air hit the front of the wing. One molecule goes over the top of the wing while the other goes underneath the wing.
    The speed inwhich the two molecules travel have been predetermined by the engine and propeller. At this given speed are you saying that the two molecules reach the rear of the wing at the same time simply by having the molecule over the top of the wing go faster?
    The speed of the wing is constant, the path under the wing is shorter than the path over the wing. Time is the same.

    Longer distance in same time is faster.
    The way we build has a greater impact on our comfort, energy consumption and IAQ than any HVAC system we install.

    http://www.ductstrap.com/

  4. #121
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793

    this is a dead end

    and my point is this, the lift on the wing is achieved by moving more air under the wing than over the wing. There is no negative pressure over the air foil, just less. Planes are pushed up not sucked up.

  5. #122
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793

    Re: Topic



    What do you think? Does high pressure steam move faster or slower then low pressure steam and why or why not.
    [/B][/QUOTE]


    Do you have a particular scenario in mind? This is quite vague

  6. #123
    Join Date
    Oct 2005
    Posts
    922

    Smile We have beaten this thing to the end

    To generate lift on the wing the wing must be tilted with respect to air flow, so the flow travels farther across the top then under the bottom. This tilting is called the angle of attack. Downward airflow deflection occurs when air flows over the upper wing surface.

    Since for every action there is an equal but opposite reaction the opposite action of the downward deflection is push upward (lift)


    We need somthing new next week

  7. #124
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,721
    It you have a 100 foot tall, 30 foot wide silo, how high can you fill it with cornflake cereal before the cornflakes on the bottom are crushed.

    Thats for next week.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  8. #125
    Join Date
    Jul 2004
    Location
    midwest
    Posts
    2,868
    Originally posted by beenthere
    It you have a 100 foot tall, 30 foot wide silo, how high can you fill it with cornflake cereal before the cornflakes on the bottom are crushed.

    Thats for next week.
    The corn flakes at the bottom are always crushed in the boxes I get.

  9. #126
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793

    Heres one for next week

    If a tree falls in the forrest but there are no humans or animals close enough to hear it, does it make a noise? I have a theory

  10. #127
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    all i know is when all you guys are 40,000 ft up hoping the wing was put on correctly and dont fall off
    i will be on the ground thinking what a f%%%%%%%% recall that one is heheheheheeheh
    flying is for the birds

  11. #128
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    All I know is that whatever is going on with my square parachute that keeps me from smashing into earth, it doesn't "suck"!
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  12. #129
    Join Date
    Oct 2005
    Posts
    88

    Re: Prop,

    are you saying that the two molecules reach the rear of the wing at the same time simply by having the molecule over the top of the wing go faster?
    Counterintuitive, isn't it? Maybe part of why flight didn't get invented earlier.

    Here's a fun trick. You need two things: 1. kitchen faucet. 1. soup spoon.

    Open the faucet to make a nice smooth stream of clear water running down (not so fast it gets all full of bubbles from the aerator).

    Hold the end of the spoon handle lightly between your fingertips so the spoon end hangs very loosely straight down.

    Move the spoon slowly over until the bottom of the spoon's bowl end - the convex side - just barely touches the water stream.

    I'll look forward to watching the arguments over what happened.

    The old ping-pong-ball-over-a-hair-dryer is fun too. Dryer set on cool.

    ----
    Ping the pong ball of my heart, dear. -Albert T. Alligator

  13. #130
    Join Date
    Oct 2005
    Posts
    922

    yup

    The spoon pulled right in could you explain why.

    How would this have an effect on a supply loop and return? Does the distance, placement of tee location change the flow?

Page 10 of 10 FirstFirst ... 345678910

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event