Super fast paper plane launcher

Step 2 Preparations requiring just a little experience

Cover one of the pieces of timber (or a similar one as you will need all three later on) with anti-stick baking paper. Tape it tightly around the wood. Mount the wheels on the motors and position them on the prepared piece of timber with the tyres just touching each other or at the most 1 mm apart. Clamp the wheels in this position as shown in the first picture. Put some hot melt glue on the motors to form an assembly as shown in the second picture. Do avoid pouring any glue in any holes of the motors. After the glue has set, remove the assembly. If you are planning to have children assemble the device, remove the wheels in order to allow them mounting them their selves.

Solder the wiring as shown in the fourth picture. Note the motors are wired in parallel, but with opposite polarity (they need to rotate in opposite direction). The rotating direction of the combination can be corrected with the polarity of the batteries, so you do not need to worry about that, at this stage.

Later on, you can attach the switch anyway you want, but included in this instructable is an option that makes mounting it real easy for kids building the device. It involves drilling a 12 mm hole in one of the pieces of timber, at about 11 cm from one end. See the last picture. You can do that in preparation, but if you have a pillar drill setup available, even young kids can do that themselves under close supervision.