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this tin little speed boat has been an Indian icon for decades. it cost about 20 Rs and
is available during festival time. you can see there is an inlet pipe, there is an outlet
pipe and this is small boiler. you can put a roof on top. then you can see the inlet
and the outlet more clearly. this is the under belly of the boat. you need to take a dropper,
fill it with water and fill water in one of the tubes so that the boiler is filled with
water. then take a small cup with the wax and a wick. light the lamp and with the help
of an adult put it right under the boiler. after sometime the water would get warm, hot
and steam would diffuse and the boat will start with a phat phat noise. it will start
rotating round and round in circles. now what is happening is that the water is being sucked
in by one pipe and steam is being ejected from other pipe giving the boat its thrust.