Find contentI don't quite think you understand how flywheels work... They run on purely electrical systems, no spring would have any effect on their use. They have a "spin-up time" due to the stall current they draw (the current it takes to get them up to speed), which can only be "sped up" by using a voltage source that can supply a lot more current. Alkalines and Trustfires don't quite have the discharge capacity that nicer battery packs have, and thus when using them, you will still experience that spin-up time.
And that's not saying go out and buy a few battery packs and throw more voltage at it to attain the current necessary, do some research and find something in your price range that doesn't exceed the voltage range of whatever motors you use and can supply current like a boss.
Sorry, maybe I wasn't clear enough. The springs would give the motors a boost when you accelerate them. Unless something is different with these motors, I have worked with the same type of motor, and spinning it in the beginning would speed up the acceleration time.
