The Carl Goldberg Chipmunk 400 is a low-wing, electric ARF exhibition/air show airplane marketed as an intermediate low-wing aerobatic park flyer-class aircraft. It is approximately the same size as most foam aircraft, but is jig-built of laser-cut balsa and polyester film construction. "Street" price is comparable as well, making the Chipmunk 400 a viable alternative to foam aircraft. A considerably larger glow-powered version requiring a .45 to .60 two-cycle or .60 to .90 four-cycle engine is also made by Carl Goldberg.