For the ultracapcitor series of bicycles, I am equipping one with mechanical flywheel.
The seat and top tubes are 1 3/8 inch. The down tube is between 1 5/8 and 1 3/4 inch.
The frame geometery is uncertain but will probably hold a 12 inch flywheel.
Where can I buy a spoked cast iron flywheel with 1 1/4 wide and deep circular or rectangular cross section rim, about a two inch hub, and 5/8 bore with keyway or broached integral key?
A machine handwheel just won't do. Not a big enough rim, and not symmetrical.
Operation speed is 120 rpm pedaling max, times 48/12 front/rear drive = 480 or500, times 48/8 rear/flywheel, or 3000 rpm. At that speed, if aerodynamic drag is over 5 watts, I need to know and can consider a profiled or built wheel. Needs to be well balanced as supports are 1/8 sheet metal on either side of the frame of the bicycle, against the 1 3/8 tubing. To establish the 1/16 inch clearance I can make the metal thicker. It will be in the form of 14 inch approx circles, or full width panels.
Can anyone estimate the rim weight? I can calculate the energy.
Doug Goncz (at aol dot com) Replikon Research, Seven Corners, VA1100 original posts at: