A model aeroplane of this type and size can be made to fly from the very first. Many of the problems which appear so difficult in constructing a three-foot model, such as balance, head resistance, and the proper adjustment of power, practically are avoided in this miniature aeroplane. There is a great advantage again in the fact that the small model may be flown indoors in the average room, where the air problems are almost negligible. Fig. B. Let the motor base consist of a single stick one-fourth or three-eighths of an inch square and one foot in length. At one end of the base, attach a block of wood one inch square and of a thickness equal to that of the stick. Glue this in position and bind it securely by wrapping with thread touched with glue. At a point three-quarters of an inch above the stick, drill a hole parallel to the frame for the axle of your propeller. A hooked wire should be attached to the opposite end of the base. One end may be run through the stick and fastened, or it may be imbedded in a block fastened to the stick corresponding to the axle block. A simple and effective motor anchorage may be made of metal (described elsewhere). Your propeller should measure four inches in diameter. A propeller cut from a blank one by four inches and one-half of an inch thick will give a good pitch. Either a propeller of wood or metal such as has already been described will answer. The propeller should be mounted upon an axle and adjusted to the bearings, and the hook after passing through the bearings in the support turned into a hook for the rubber strands. Select from the detailed instructions the method which appeals to you. Be sure that the propeller spins smoothly. It should be so delicately adjusted that it will turn literally at a breath. Before stringing the rubber strands between the two hooks of your motor, be sure that the hooks are bent back, so that the strands will be in a line with the bands. The bearings should be carefully oiled. In flying out of doors, there is danger of getting fine sand or dirt in the bearings which, of course, greatly increases the friction. Try out your motor with four strands of rubber one-eighth of an inch square. The rubber sold for one-eighth inch is often a trifle under this measurement. The propeller should, of course, be mounted with the shorter or curved edge forward. In winding your motor, never turn it after the second row of double knots begin to appear, and do not keep your propeller wound a second more than is necessary before a flight. [Illustration: An American Fleming Williams built by C. McQueen] [Illustration: One of the earlier models built by Cecil Peoli]