Moki 180 $279.99.... YS 140DZ $680.00

The reason why Moki 180s arn't used in F3A is partly due to the fact pattern birds are designed around and for the YS line of engines. There also lighter than the Moki. The Moki 180 however is a stump puller and used more often in giant scale 1/4 planes for 3d aerobatics.