How to Model a Hiller Flybar Mathematically?

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SUMMARY

The discussion focuses on the mathematical modeling of a Hiller flybar for model helicopters, emphasizing the need for a physics-based approach. The user has identified the Moments of Inertia but requires assistance in determining the center of inertia for the system. A reference paper from the University of Toronto and additional resources on aerodynamics and flybars were suggested to aid in the modeling process. The conversation highlights the scarcity of detailed mathematical models for flybars, particularly in the context of RC helicopters.

PREREQUISITES
  • Understanding of basic physics principles, particularly in dynamics.
  • Familiarity with Moments of Inertia and their calculations.
  • Knowledge of gyroscopic effects and their application in helicopter systems.
  • Basic understanding of aerodynamics as it relates to helicopter flight.
NEXT STEPS
  • Review the paper from the University of Toronto on helicopter dynamics.
  • Explore the aerodynamic principles outlined in Section 2 of the referenced thesis.
  • Investigate the mathematical modeling of gyroscopes in relation to flybars.
  • Search for additional resources or tutorials specifically addressing Hiller flybar modeling.
USEFUL FOR

Model helicopter enthusiasts, aerospace engineers, and physics students interested in the dynamics of flybars and their impact on helicopter control systems.

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Need Physics model for Hiller system

Have been working on a model helicopter for some time and need to mathematically model a Hiller flybar. I have basic understanding of physics and have been researching gyroscopes to model the system, but still am missing a few bits and pieces. Have the Moments of Inertia figured out I think, but need to figure out the center of inertia for the system. Think that this will take the design above the principle axis. Can anyone help or direct towards a detailed tutorial?
 
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I must say you don't hear much about flybars any more unless you are talking about RC helicopters. I can't ever remember seeing a model presented for controlability issues with a flybar installed. However, their use is important, especially at small scales.

I did a bit of looking around and did come up with a paper from the Univ. of Toronto.

http://www.control.toronto.edu/~lidstone/Helicopter_thesis.pdf

Section 2.5 briefly goes int flybars and section 2 goes into some aerodynamic background. Start with this and see if this will help you with what you already have. I have a couple of references at home, but I don't think they discuss fly bars.

You may try RC forums, but I doubt you'll find anyone mathematically modelling their projects.
 
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