HI All!, I'm a thesis student in Industrial Design and need some physics help! My thesis project is to make a system that stores energy in the form of kinetic energy in a flywheel to power common products. This system would be plugged in all the time and would begin working immediately after the electricity flow stops(power outage) because of the nature of flywheels. My biggest issue is deciding what is the best generator to use and how much weight would be needed to power three different categories of household products, they are: (cellphones, alarm clock, small lamps ect,) next, (hair dryers, and straighteners, garage doors, ext) lastly the major appliances like refrigerators, furnaces microwaves ect......I know that I would need somewhere in the 600lbs range at about 100RPM to power a refrigerator for an hour(or so I was told) and 20 tons to power a house. My target weight is somewhere around 30 - 50lbs so that it's still marketable and to target the smaller electronics because I'm gearing this towards inner city apartments where you cannot have a gas powered generator. Also does anyone know how I could figure out how much electricity is need to keep this system spinning at full speed? Also currently I'm using an old Technics turntable that the record sits on a disc that has a fixed magnet in it and is powered by brushless electromagnets to prove that I can generate power. I by-passed a series of resisters sending about 24VAC to the motor and added about 25 lbs to the center that is almost perfectly centered. At this current set up I'm getting about 7.5VAC that reduces to 0 in about 5 minutes. Does the diameter of the disc(flywheel) change the kinetic energy? or if the majority of the weight was around the outer most point and not in the center? I know that in my current set up I'm loosing a lot of power in friction, and bad circuit design but for this stage I just need to prove that it's possible and to be able to light some LED's or HOPEFULLY wire a rectifier and capacitor with a voltage regulator to stabilize the about 7.5VAC that I'm getting now into 5DC. Sorry this was long winded but I'm looking for formulas that can help me determine the best set up for the scenarios that I mentioned before. Any help what so ever would be greatly appreciated!!