I am using four rounds of 1/16” rubber string for the motor. That makes eight strands. Six do very well. This is a very useful little model but it will not fly over fifty feet, or mine has not, but the fact that it does not fly far, gives you opportunity to study its start, its landing, and its flight. The long distance models are out of observation range so soon that we miss the chance to diagnose their crazy symptoms, if they have any, and most of them have some. [Illustration: FIG. 226.] At the beginning of model aeroplane making, everyone seemed to try to see how much surface could be exposed in the planes, now the best models are those with as narrow planes as it is possible to use and still support the air craft. The reason is obvious--there is so much skin friction on broad surfaces. At the beginning, many were inclined to scoff at the rubber band motor, but since flights have been made considerably over a half mile, with this same power, it seems good enough for anybody. Most of the long distance flyers have long framework so as to accommodate long strands of rubber, which allow much increase in the winding up of the motor. [Illustration: FIGS. 227, 228.] =A Good Model.= A simple and effective model is shown in Fig. 226. Lay out a light framework, as shown in Fig. 227. It is the combination of a tailless kite and a triangular box-kite. Three long sticks, _a_, _b_, _c_, are used for the triangular portion and three cross-sticks, _d_, _e_, _f_, are for the wing supports. A vertical post, _g_, about ¼” × ⅜” × 8” is used in the center of the rear (the wide part), to stiffen the frame and give an anchorage for the propeller shaft. Four light braces, _h_, _i_, _j_, and _k_, make it possible to use lighter material than one would suspect for the entire framework. In a model 3’ long, _a_, _b_, and _c_, need not be larger than 3/16” square, but there must be no split or uneven places in a stick so small. The braces ⅛” × 3/16” would be plenty large. The two upper pieces, _b_, _c_, should be flattened on the inside of the front end so as to make them join together, terminating in a point. The lower spine, _a_, should be flattened on the upper side for the same reason. All three should be glued and lashed together with linen thread. A triangular block, _l_, should be placed about 4” back from the front end with a strong cup-hook screwed in the side toward the rear, on which the ring of the rubber motor is attached. The block, _l_, must be well secured to the triangular framework with glue and thread. The cross-piece, _d_, is 30” long and is bowed upward as is shown by Fig. 228. Piece _e_ is 24” long, 5” in front of _d_, and both are 3/16” × ¼”. ⅛” × 3/16” will be heavy enough for _f_, and this should be bowed much more than _d_, and _e_. It will be necessary to steam this piece a little. Chinese rice tissue will be good for covering. Cover the underside of the two planes, and the underside of the triangular framework which is similar