These airplanes do double duty. As weather vanes, the airplanes turn into the wind, and as whirligigs, their propellers spin in even a light breeze. Projects are made from 1/2" plywood and 3/4" stock. All patterns drawn FULL SIZE. Airplanes measure from 21" to 30"L, with 30" to 42" wingspans. Select the appropriate hardware kit: For plans #W2972 and #W2977 order #2022 Single Engine 2-Blade Hardware. For plans #W2967, #W2968 and #W2971 order #2023 Single Engine 3-Blade Hardware. For plans #W2958, #W2969, #W2973, #W2974 and #W2975 order #2024 Twin Engine 3-Blade Hardware. Hardware packages include all necessary bushings, shafts and pre-cut propeller hub(s). 3-blade hub kits also include plywood for propellers.