Velos UAVs are simple to fly while offering more reliability, longer flight time and more payload capacity than any quad or multicopter in the same class today. Velos UAVs are more stable in bad weather, achieve higher cruising speeds, have higher ascend and descend speeds, which results in longer flight time.
Lift is proportional to wing area. Considering that the outer 30% part of a blade – rotor – propeller produces more than 60% of the total lift it is clear that as the propeller gets smaller we will have to use more propellers rotating at much higher RPMs in order to compensate for the reduced wing area and produce the same thrust. The efficiency goes down and energy is being wasted in rotating many small props at high speeds. Also according to the Reynold numbers, the larger a wing – rotor – propeller gets, the more the lift coefficient increases. In other words you get more lift for less energy. So you can fly more with the same payload or have heavier payloads in the same flight time.
Additional reasons helicopters are superior to quads include: