The Quanum series of carbon fiber propellers have been specially designed for multi-rotors and are manufactured to very exacting standards. They are extremely light and strong and you can expect an increase in performance due to their ultra thin and stiff carbon construction.
These propellers have dual mountings which means they will fit most multi-rotors, you can either use the standard 4mm center hole (which can be reamered for larger shafts) or you can use a tightening cover with 12mm centers and M3 bolts.
Length: 18 inch
Pitch: 5.5 inch
Shaft Diameter: 4mm
Cover Plate Hole Centers: 12mm
Hub Thickness: 4mm
Weight: 36g each
Rotation: Clockwise and counterclockwise
Unit Weight (g):
Compared to the 18x5.5 DJI style props (wich cost twice as much) these are about 10pcnt less efficient; 114W at 1000g thrust compared to 104W (same motor ESC and battery setup) DJI style props and 290W at 2000g compared to 260W DJI style. However by sanding the blunt leading edge round and the blund trailing edge sharp you can recover the efficiency loss and even gain a little on the more expensive DJI style props. So if you are willing to put in the extra effort these are a bargin! The actual weight is about 41g each.high quality props almost perfect balance