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Magnetal paper covering flywheels here
Funny - I can't seem to find the discussion about gyro-effect and flywheels here so I am starting it. Magnetal has performed a calculation of the added gyro-effect from a flywheel. Visit to download it. This says that the added force from the gyro effect is in the region of 10 to 20 N (in a not so pleasant load case). Answer to mahonj above regarding to self-discharge time... With passive electrodynamic magnetic bearings these can be reduced to about 1-2% per hour.
Kelly - regarding inertia please see The inertia isn't a problem. The added "gyro-effect" is probably larger from the crank shaft and engine flywheel. A faster and smaller flywheel is even better in this sence,
For more information on flywheels and gyro effects please visit The document shows that there will only be a minor force of about 10-20 N trying to tilt the vehicle. Probably the crank shaft and engine flywheel will add more forces to the system. A smaller fast spinning flywheel is also reducing the effect.
Roger K and Henry Gibson... Roger - Yes you are right that Pentadyne has flywheels. These are, to my knowledge, intended for stationary use. They are using active magnetic bearings to keep the friction down. Unfortunately they require some energy to run and they are still quite costly. Magnetal is providing a unique passive component - Electro Dynamic Bearings - that are virtually friction free. Magnetal is right now working on a flywheel solution for vehicles called GESS (Green Energy Storage System). This component can significantly reduce the battery size with at least 40% thus also reducing cost, weight and volume. In addition the GESS component is handling fast charge and discharge events which significantly improves battery lifetime. Please have a look at Regarding compressed air... there are huge energy losses involved to compress air (depending on how high pressure you want). Just go out and feel the heat generated by a regular diving compressor and you will know where the energy is lost.