Welcome Guest. Sign in or Signup

There is 1 degree 11 minutes precone angle at the tail rotor of R-22. What is the purpose of this? As well as, That precone angle affect any aerodynamical factor on tail rotor? 

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.

2 Answers

  1. Kaci_32 on Aug 24, 2017

    There is no coning hinge on the tail rotor

    -1 Votes Thumb up 0 Votes Thumb down 1 Votes

  2. Kris Kortokrax on Aug 24, 2017

    It is true that there is no coning hinge on the tail rotor.

    However, the tail rotor is pre-coned. This is to reduce stress on the blade caused by creating thrust (lift).

    For an example, look at how the main rotor behaves as you increase collective to take off. (You need to watch someone else take off). You will see how the outboard ends of the blades rise a bit. Centrifugal force (yes, I know it’s not a real force), keeps the blades from folding upwards. There exists a balance between the upward force created by lift and the outward acting force. The main rotor blades have a coning hinge to allow the main rotor blades to cone without bending.

    As the tail rotor blades have no coning hinges, and the blades are short, the pre-coning helps keep the blades from experiencing bending.

    +2 Votes Thumb up 3 Votes Thumb down 1 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.