Uh...The PQhor and Spa3d are different airplanes. Very simular in design however the spa3d has a totally flat wing where as the pqhor has some camber in the wing. There is also some difference in where the holes are cut into the coro for the wing to be mounted. There is indeed a difference in performace. The Pqhor harriers and hovers easier than the spa3d, but the spa3d will flat spin, roll, do some basic IMAC better than the pqhor (this is not to say that the spa3d will not hover or harrier b/c its still very good at it).