In front of you a drawing of a simple model with electric motor and propeller. The real boats of this type are used in shallow rivers where conventional marine propeller can be damaged. Model making used popular material is Styrofoam. It is very easy and well handled. It can be cut with termoresta (see “M-K” № 3, 1978, p. 47), as well as a jigsaw, hacksaw or thin sharp knife. The processing done by plane or blade from a safety razor and a glass cloth. When gluing or painting you cannot apply substances containing acetone or nitrobacteria, as they spoil the foam.
First watertite model in full size. Then move through the blueprint details 1, 4, 8, 9, 10 carpentry for plywood with a thickness of 3-5 mm cut out their jigsaw and sand the glass cloth. Foam thickness of 50 mm cut out two block sizes 390X90 mm. Mark on both halves of the cutouts for the cockpit and the batteries as shown on detail 9, and cut them out. To detail 9 attach the M3 screw with nut the wheel 11, is cut from aluminum (thickness. 1 mm) or copper (thick. 0.5 mm) of the sheet. Then glue BF-2 or PVA, both of the bar on both sides of the part 9 and press them to each other. So as not to damage the edges of the bars, attach to the side walls of the plank of soft wood dimensions 10X50 mm, For retraction, it is possible to use rubber thread, the joiner’s clamp, etc.
When the glue dries, make the cuts in the bow and stern and glue parts 1 and 10. Put cardboard on half the top and side projections of the contour of the body. Then cut them out and trace with a soft pencil on the model. Now, putting the hull on a solid stand, give it the desired shape, making sure that both halves are symmetrical. Then glue the body is thin paper (newspaper). Paint the shell in the foreground, previously having puttied the bumps, after drying, sand smooth, put another coat of paint. The final coating is carried out with synthetic enamel. Paint recommend contrasting colors, for example, white with red, white with blue etc.
The side walls of the cabin (part 3), right and left, and front window (part 2) cut out of heavy paper, fold as shown and before gluing put a piece of thin celluloid, imitating glass Windows. The seat is made of foam and before you glue in the cockpit, color red and it and the outside of the cabins. Floor glue black paper or a piece of Wallpaper imitating wood. Secure the wheel.
In the top slot of the pole stand insert the motor (item 8) attached strips 5X5 mm, having one face cut away, as shown in the drawing (sec. G—G). For the motion model is microelectromotors 4.5 In (item 7), the shaft is tightly attach the propeller (item 6) If Ø140 mm. hole in the grommet is too small, drilled it up to Ø1,9 mm. a Motor with a propeller set on the stand and secure pharmacy rubber band, threaded through a hook wire Ø0,8 mm (paper clip). To connect the motor to the battery 3336L 4.5 To use the wire Ø1 mm Switch made of the contacts from the old battery and the two M3 screws with nuts.
Toggle switch to place the pole under the stand pole. Turning on the motor, make sure whether it rotates in the right direction: the air flow should go over the stern of the boat. If not, then the direction of rotation of motor can be changed by changing the ends of the wires on the contacts. Battery it is necessary to close the lid (item 4), one end of which is inserted under the pylon, and the other is fixed by cotter pin, wire Ø0,8 mm, is inserted into the hole of the part 9. At the front of the cover drill two holes of Ø1 mm and insert them in the bracket, too, from wire Ø0,8 mm, for easy opening of the lid when changing batteries.
The model is run in calm weather. The direction of movement is controlled by the position of the steering wheel.
Note. The drawing shows only the right half of the case (top view); left-right symmetric. An electric motor on the top view is not shown.