AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Taming Turning Tendency Prof. H. Paul Shuch, Ph.D., CFII LSRM-A/GL/WSC/PPC, iRMT Heavy Chief Flight Instructor, Director of Maintenance AvSport of Lock Haven FAA Safety Team Lead Representative Piper Memorial Airport, Lock Haven PA
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 A FAASTeam Wings Award Webinar
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Experimental Aircraft Association AvSport of Lock Haven Aircraft Spruce and Specialty Company Your FAA Safety Team Brought to you by:
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Many pilots report (especially when flying Light Sport Aircraft) that raising the nose causes the plane to yaw in one direction, and lowering it yaws them in the opposite direction. This gives LSAs a reputation for being instable (or squirrely). In fact, these aircraft are merely obeying natural laws. In this FAA Wings Webinar, a retired physics professor will teach you how to anticipate, detect, and conquer gyroscopic precession. RATIONALE:
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 OBJECTIVES: Upon successful completion of this webinar, you will: Visualize Cartesian coordinates Predict precession effects Anticipate aircraft yaw response Respond with decisive rudder Overcome lateral instability Avoid hitting the runway lights
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 A FAASTeam Wings Safety Seminar
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Sentimental Journey to Cub Haven Piper Memorial Airport AvSport of Lock Haven Your FAA Safety Team Brought to you by:
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 RATIONALE: Many pilots report (especially when flying Light Sport Aircraft) that raising the nose causes the plane to yaw in one direction, and lowering it yaws them in the opposite direction. This gives LSAs a reputation for being instable (or squirrely). In fact, these aircraft are merely obeying natural laws. In this FAA Wings Safety Seminar, a retired physics professor will teach you how to anticipate, detect, and conquer gyroscopic precession.
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 OBJECTIVES: Upon successful completion of this seminar, you will: Visualize Cartesian coordinates Predict precession effects Anticipate aircraft yaw response Respond with decisive rudder Overcome lateral instability Avoid hitting the runway lights
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Caveat: The procedures shown here are used successfully by one particular instructor, in one particular category and class of aircraft. They may not apply in your situation. Your mileage may vary. Disclaimer: Nothing in this presentation should be considered a substitute for adequate dual training, conducted by an appropriately rated flight instructor familiar with your particular aircraft. Waiver: By viewing this presentation, you understand and agree that: –Flying is a sport –There is risk associated with all sports –You accept that risk
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Getting to know you…
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Which of the following are you? (choose one that best describes you) Student Pilot Sport Pilot Private Pilot Commercial Pilot / ATP Flight Instructor
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Introduction: The Axis of Evil
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Pitch, Roll, and Yaw Axes:
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Rene Descartes (French mathematician and philosopher, )
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 CARTESIAN COORDINATES
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Mutually Orthogonal
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 CARTESIAN COORDINATES
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Quiz Time!
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 For purposes of this course, we will consider the direction in which the aircraft is traveling to be: The X-axis The Y-axis The Z-axis Any axis we choose None of the above
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 PRINCIPLES OF THE GYROSCOPE
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 PRECESSION (Z) (X) (Y)
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 PRECESSION (Z) (X) (Y)
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 PRECESSION
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 PRECESSION
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Another Question!
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 If the aircraft is traveling down the runway (into the page), and you raise or lower the nose, the plane will precess in: The X-axis The Y-axis The Z-axis All three axes None of the above
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 CARTESIAN COORDINATES
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 FOUR DEGREES OF FREEDOM
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 AILERONS CONTROL ROLL (your bank control)
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 RUDDER CONTROLS YAW (your directional control)
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 ELEVATOR CONTROLS PITCH (your airspeed control)
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 THROTTLE CONTROLS POWER (your altitude control)
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Sometimes, you just gotta dance!
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Doh!
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Gyroscopic precession is best corrected through application of elevator rudder ailerons throttle flaps
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 IF SOMETHING ROTATES, IT CAN PRECESS
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 I know this one!
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Gyroscopic precession is least evident in a(n) Airplane Gyroplane Powered parachute Glider Equally evident in all
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 TAKEOFF AND LANDING ARE TRICKIEST
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Final Question!
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 Gyroscopic precession can be observed during: Rotation Flare Go-around Power-on stalls Any of the above
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 A Final Thought Which way will you precess? It depends… Is the engine direct drive, or geared?
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015
AvSport of Lock Haven Precession Precision Presentation Copyright © 2015 EAA.ORG/WEBINARS