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I decided that im going to give up on the homo polar engine just because i just cant think of a good variable and im just going to do a levitating block. Its abit basic but i just cant think of anything else.

Yeah i should of mentioned that im in Year 9. I can only think of the basic ones i really want a technical one but i just cant think of any.

Hello, I decided that i would do something involving the homo polar engine for my science fair project. I have been trying to think of a variable i can change for it but all the ones i have come up with just wont work. Some of them are: •Battery size (wont work it only works on 1.5v batteries as i read somewhere) •Types of batteries (would be to expensive to test 7 times on each battery) •Do the 5 speed homo polar engine and record the amount of revolutions it does a minute. I have had others but have forgotten them. Ive ran out of ideas, so Ive turned to the brains of this science forum. Please if someone has a good variable that i can test well, graph and doesn't involve buying A LOT of batteries it would be brilliant if you could tell me. BTW i live in Australia just in case someone was going to mention something that can only be done in America.