Can I ask you about some opinions? We desired to build a bicycle. That is we convert our mechanical energy to electricity energy and stored in capacitor by dynamo. Then when it reaches certain value we discharge it and connected to the portable air compressor. The electricty drive the compressor to suck in the air and compressed it to high pressure air that is stored inside the gas tank. When the gas tank is charged, the high pressure air is discharged and push the piston that is connected to the crankshaft that convert linear motion to circular motion hence drive bicycle's rear wheel. This help to save energy for long distance travelling and slope difficulty. Is it a possible and workable idea? Thanks ya!