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Disk Loading is the pressure (weight force divided by disk area) maintained over the swept area of a helicopter's rotor. A heavy helicopter with short rotors will have more disk loading than a light helicopter with long rotors.
P-factor: See asymmetric disk loading, 8.5
P: ≡ pressure, 3.4
PIC: ≡ pilot in command, 21.1
Pitot tube, 2.12.6, 3.4.2, 11.2
POH: ≡ Pilot's Operating Handbook, 1.2.3
Pressure: definition, 3.4.3 ...
Whether ducted or free, the basic rule is that a propeller with low disk loading (thrust or power vs. disk area) will be more efficient that one with high disk loading.
The major factors that will determine the shape and size of the low airspeed portion of the HV curve are rotor inertia, disk loading, and gross weight.
 See also: Weight, Climb, Thrust, Airspeed, Speed
  
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