Less efficient than an aircrafts wings over a long distance but very efficient for an aircraft with engines pointing straight down.
The blades are massive, push a lot of air relatively slowing compared to smaller engines. There's a reason most planes will stall when pointing straight up, despite in theory having more power to weight. Their prop efficiency is worse than a helicopters rotors.
Less efficient than an aircrafts wings over a long distance but very efficient for an aircraft with engines pointing straight down.
The blades are massive, push a lot of air relatively slowing compared to smaller engines. There's a reason most planes will stall when pointing straight up, despite in theory having more power to weight. Their prop efficiency is worse than a helicopters rotors.