cowl for 1/4 scale cub
 

Have a sig 1/4 scale cub that I mounted a 33cc homelite on. The cowl has to be cut for the carb,muffler & head. Any ideas?????? Other flyers say to mount cardboard on the fusalage & trace the carb. & muffler then remove the engine & trace the cutout on the cowl & cut it out.