Welcome Guest. Sign in or Signup

5 Answers

Adverse Yaw

Asked by: 7351 views , ,
Aerodynamics

Hello,

 

Please explain in simple terms "how is adverse yaw produced?"

 

Thank you

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

5 Answers



  1. Shea on Mar 16, 2013

    Adverse yaw is produced when you start a turn. For example if you want to turn your airplane to the right. The right aileron goes up producing less lift and less induced drag with it. The left aileron goes down producing more lift and more induced drag with it. These two actions happen at the same time when you first start your right turn. This causes the airplane to roll to the right and yaw to the left when you first start turning.

    A little right rudder early on can almost eliminate any adverse yaw. Hope this helps. Ask more if you need any clarification.

    +1 Votes Thumb up 1 Votes Thumb down 0 Votes



  2. nine on Mar 17, 2013

    regarding this topic, i would like to clarify about “induced drag”

    when one wing’s aileron is lowered into the relative wind, the upper camber section of that wing is increased. thus pressure over the wing is decreased further more (venturi tube effect), resulting in greater pressure differentials… generating greater wing tip vortices… resulting in greater “induced drag”.

    am i correct?

    0 Votes Thumb up 0 Votes Thumb down 0 Votes



  3. Brian on Mar 18, 2013

    –“when you first start turning.”

    Not just when you start. Adverse yaw exists anytime a rolling moment (or change in bank angle) exists.

    –“am I correct?”

    Yes. The rising wings upper camber increases and the opposite wings camber decreases. Either this explanation or the one Shea gives regarding an AOA change on the section of the wing where the ailerons are present will suffice. Each explanation tells the same story and draws the same conclusion.

    Just think rudder is slave to the ailerons or the rudder pulls the ailerons. In other words, when making an aileron input that results in a changing bank angle you need to subsequently apply rudder to remain coordinated. Stop banking..no more rudder. Bank out of the turn..rudder again.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes



  4. nine on Mar 18, 2013

    Hey Brian,

    The correct way to put it with regards to “upper camber increases” would be:

    the distance between the chord line and the mean camber line is increased when the ailerons deflects downwards. therefore the camber (curvature) is increased. this also applies to flaps.

    Quote from nasa.gov page: “The maximum distance between the two lines is called the camber”
    source : http://wright.nasa.gov/airplane/geom.html

    0 Votes Thumb up 0 Votes Thumb down 0 Votes



  5. Brian on Mar 18, 2013

    –“The correct way to put it..”

    Did I say something contrary?

    By the way careful what you read on that NASA site. Its a great resource but it’s highly subjective. In this case how you define camber relies on how you define chord. Usually chord is defined independent of flap or aileron inputs. In which case camber and AOA remain unchanged.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.