Dragonwings Vrs. Sportcopter Results!

Area = 29 X 7 /12 = 16.92 sqft
 
Raghu or Doug, Chuck B. hasn't visited here for awhile (hope the hurricanes haven't caused him a problem) and I have a question that an 'ole' timer should probably know so lets pretend someone else is asking the question!

In calculating disk loading It seems the entire length of the rotor blade is being used to calculate the blade area. It would seem that only the airfoil area would be used since it is the part that is providing the lift. Why do we use the whole blade?
 
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