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Thread: [question] Two bladed rotor system
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Old 16th Jun 2009, 11:28
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Graviman
 
Join Date: Nov 2004
Location: Cambridgeshire, UK
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CS-Hover,

I would have a look at the various types of rotorhead that exist:

Aircraft in Detail - Helicopter Rotorhead Gallery Index

You could also lookup "effective hinge offset" in Prouty.

2 bladed rotors "teeter" about a bush on the hub to keep the machine weight (and cost) down. The blades actually cone slightly above the plane so that centrifugal forces carry the weight of the heli.
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