how to make a propeller for a battery powered toy boat?

[SilvyCherian]

i m makin a science model of a small motorboat. and i want to make a propeller for it.

 

[Sheela]

try providing an electromagnetic effect for the propeller just like an armature coil in a motor that will automatically rotate the propeller and push the water backward thereby pushing your boat forward.Make sure that the battery provides current to the coil on the magnet