Powder Drop?
Try this one, We take a 1/8" dowel and rubberband it to the fuse just behind the wing so about 3 or 4 inches is sticking up . We made a donut out of ply. Make a target on the runway, make a flyby, give it a slight humpty, donut will come off top of dowel. Lots of fun. Harder to hit the target than it sounds. AL