corrugated plastic planes are simpler alternative to the traditional balsa wood based r.c. aircraft for a variety of situations. most of the spad airplanes do not use balsa which saves considerable cost. they withstand crashes better than balsa counterparts because of their resilience and hence are a good choice for beginners. good trainer planes and gliders can be made from spads. spad modelers make equally good advanced planes that can be made with corrugated plastic. they include: rc airplane combat, 3d flying, and are preferred in places where the flyers would normally not risk a more expensive plane and yet want the same flying characteristics of balsa planes.