Originally Posted by gyronuts
Mickey will probably know the answer.
I use 1.25 ounces per square foot of total rotor disk area per blade for small models. so 2.5 ounces sq foot for two, 3.75 for 3 blades. Bigger models tolerate heavier loading. My stuff was about 7 square feet and 16 ounces -- 2.3 ounces/square foot with two blades and i could deadstick land with no trouble.