Some model builders still retain the wheel skid in a much simpler and lighter form. The miniature bicycle wheels do very well for scale models, but since they are likely to add an ounce or two to the weight of the aeroplane, they are prohibitive. To avoid this weight, the wheels may be made of simple disks of wood cut very small. A wheel one-half an inch in diameter, cut from a board one-eighth of an inch thick, weighs practically nothing and affords sufficient support. These may be mounted very simply on axles made of bent wire attached to the feet of the skids. Sandpaper the rims to an edge in order to reduce the surface presented to the air. Since their surface is edgewise to the line of flight, they will offer very little resistance. The wheels on some of this year’s models are formed of wire disks covered with silk. The weight of these wheels is practically nothing, and they add much to the appearance of a well-finished model. Wire disks which may be covered in this way may be bought from the supply houses. It requires rather a skilful hand to shape the wire into perfect circles which will run easily. The covering again is a very nice operation. The silk wheel is not recommended for the beginner; but for one who is anxious to finish his model to the last detail as attractively as possible, they form an interesting feature. Ping-pong balls make serviceable skids. Since they are carefully rounded, they will turn easily. To mount them, drill a hole for the wire shaft or axle, taking great care to have it pass through opposite points of the sphere. The wire may then be bent above it and attached to the skid. The celluloid turning on the wire axle produces practically no friction, and the ball offers very little resistance to the air. The balls are, of course, extremely light and add little to the weight of the model. By combining the skid and wheel form of support, your model will gain the advantage of both these devices. The general form of the Farman skid may be followed. The skid in this case should be fairly heavy, strong enough to hold its shape, although elastic enough to take up a considerable shock. The simplest plan is to connect the two skids by a cross piece, and use this as the axle for two small wheels, mounted on the outside of the skid. This plan enables the aeroplane to rise with the minimum amount of resistance and land at the end of a flight with protection.