Acceleration and Deceleration


To learn coordination of control inputs; introduce performance check


  • Use the VFR scan to maintain altitude and trim during changes in attitude
  • Develop awareness of aircraft performance by having student determine the power setting necessary for cruise flight

Instructional aids and pre-requisites

  • Model helicopter
  • Lesson FC-5 is a pre-requisite


  • Pre-flight briefing: Demonstrate the effect increasing lift has on airflow over the horizontal stabilizer and pitch attitude; correlate to need for change in cyclic input when raising collective.
  • From straight and level configuration at 75 kias.
  • Determine cruise power setting.
  • Increase collective approximately 2˝ MAP and re-trim the aircraft.
  • Add forward cyclic to stabilize the aircraft at 85 kias and in level flight.
  • Begin deceleration by reducing collective approximately 4˝ MAP and re-trimming the aircraft.
  • Add aft cyclic and reduce collective as necessary to stabilize the aicraft at 60 kias .
  • Return collective to cruise power setting and make appropriate control inputs to return to straight and level flight at 75 kias.
  • Reference airspeed indicator and altimeter during maneuver

Common errors

  • None specified

Completion standards

  • Student will be able to coordinate cyclic and collective to accelerate and decelerate the aircraft.
  • Airspeed ±10 kias
  • Altitude ±100΄
  • Heading ±10°
  • Aircraft in trim

Teaching considerations

  • None specified

Additional practice

  • None specified

Additional resources

  • None specified

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