Mini Submarine Using Plastic Bottle and Balloon
This is a small project of submarine made up of a waste water bottle or any other blank bottle and balloon. This submarine can goes at the ground level of water and can return to the water surface very fast.
(3) Long flexible plastic tube
(5) Some adhesive
Step1: Take one waste water bottle any other waste bottle and make holes around it as shown in picture.
Step2: After making holes in bottle rub all the holes by file and make it smooth so that balloon will not bust.
Step3: Now make a small hole on the cap of bottle and fix one end of tube in it but the hole must be of size equal to mouth of plastic tube so that we can easily move the bottle in water with the use of tube.
Step4: Then connect balloon at one end of tube which is inside the bottle and stick it by adhesive or you can also tight it using string. You have to take care of balloon so that it will not come out off tube cause of air pressure.
Step5: Your submarine is now completed.
Step6: For testing your submarine place your submarine on water surface and suck all the rest air from other end of tube by mouth, still your submarine is not going down then add some weight in bottle now it will defiantly work, now when u want to take your submarine up, just blow air from tube it will come again up at the surface of water.