Originally Posted by EWOL Props
It is of fundamental importance to have blades taking the same pitch
, so you need a central gear
to sync them.
Having tracked and balanced a many a helicopter rotor system, I can tell you it's not pitch
that you are trying to ensure is the same, but lift
, or thrust in the case of a prop to reduce vibration. Yes mechanically linking the blades together will result in pitch being very close to the same, it may not result in identical thrust.
Balancing the thrust output of each blade with them not being mechanically linked is a technically difficult proposition I assume, but as the Autoprop has been in manufacture for quite awhile, I assume it a problem that they licked.
All feathering props I have seen except for the Autoprop have essentially no blade shape, no airfoil, and no blade twist, and therefore must be inefficient.
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