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Old 9th Apr 2002, 19:32
  #66 (permalink)  
Dave Jackson
 
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nucleus33

A temporary hijacking of your thread, for the fun of a little technical banter;

Hi CRAN

There can be no argument about the oscillating loads from a reciprocating engine, particularly a four stroke one, with few cylinders. As well, your comments about the many advantages of belts make sense. The following might deserve a little more clarification, though.

"If you consider the R22 installation, the nature of the rigidity in-plane of the blades means that teeter-rotors convert the Coriolis forces due to flapping into a RRPM response that can create large loads in the transmission, though its small in piloting terms. This response is absorbed by the rotor, transmission and engine inertia and other resistive forces in the system.".

Subject to correction by higher authorities, I believe that most tail rotors incorporate delta-3. If the delta-3 is by 'flap hinge geometry' ( see sketch ) it will have a lead-lag component and this should reduce torsional oscillations in the drive train.


Dave J

Last edited by helidrvr; 10th Apr 2002 at 00:43.
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