Start by collecting the following items:Tools
- hot glue gun and multiple glue sticks
- a hobby knife (aka exacto knife)Materials
- one working electric remote control car
- two lego propellers*
- enough batteries for remote and car
- a sturdy** plastic bottle big enough to fit circuit board and batteris but not bigger
- the bottle's cap
- two or three corks
- electric tape
- duct tape
- a hand full of nails
- two or three feet of wire (I used wire from an old lamp but a smaller gauge (diameter) wire would probably work fine)
- WD-40 and/or automotive grease
- a plastic easter egg (optional)
Once you have collected your supplies you move on to step 1 and begin to take apart your RC car to 'harvest' the parts needed for your sub. You should know that your RC car will most likely be unrepairable after these changes.
*The best are the ones meant for lego boats or subs, though, some lego airplane propellers work... as you see in my own sub. See step 6 for a picture of these lego boat/sub propellers. You can can also buy fancy expensive propellers at any hobby shop.
**The plastic bottle must be sturdy because of the pressure that will be on it when diving deep. The deeper the dive the more the pressure. If your bottle crushes you run the risk of it leaking and damaging circuitry. It could also loose its buoyancy due to a change in volume causing it to sink out of the range of your remote. Unless you have a fishing line attached when this happens you could loose your sub.
Here is a video of the finished product at play:
(We attached a string to it while test driving just to be safe.)