Designed by jerry dunlap, the 1/4-scale crackerbox is a wooden scale model of an almost flat-bottom racing boat. powered by a zenoah g-23 marine gas engine, it can. Find best value and selection for your dumas 1439 crackerbox boat plans search on ebay. world’s leading marketplace.. Find great deals on ebay for rc crackerbox boat and cracker box boats. shop with confidence..