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Article #15731Re: Flywheel batteries as EV power source
From: Phil Ngai
Date: Thu, 17 Dec 1992 17:44
Date: Thu, 17 Dec 1992 17:44
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In article <1gp6lkINNik@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes: >In article <1gp2pdINN680@usenet.INS.CWRU.Edu>, bj368@cleveland.Freenet.Edu >(Mike E. Romano) writes: > >=This flywheel discussion is interesting. >=I am not an engineer but note it was mentioned that a proper >=size flywheel can store the energy/power of a v8 engine. >= >=What is the simple equation here for energy (horsepower) stored >=in say a flywheel weighing 200 pounds, spinning at 1000 rpm? >=My last physics course was in high school. > >First: Horsepower is a unit of power (energy delivered per unit time), not of >energy. Second, the amount of energy stored in a flywheel is dependent on the >geometry of the flywheel as well as its mass and its speed. The energy stored >goes as the product of the moment of inertia and the square of the frequency at >which it's spinning. Carl: It's not horsepower that counts, it's torque. :-) -- My opinions are my own.
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Path: arc1-ca.pugleaf.net!sparky!uunet!olivea!decwrl!adobe!pngai From: pngai@adobe.com (Phil Ngai) Newsgroups: sci.electronics,sci.energy,rec.autos.tech Subject: Re: Flywheel batteries as EV power source Message-ID: <1992Dec17.174409.5628@adobe.com> Date: 17 Dec 92 17:44:09 GMT References: <1gp2pdINN680@usenet.INS.CWRU.Edu> <1gp6lkINNik@gap.caltech.edu> Sender: usenet@adobe.com (USENET NEWS) Organization: Adobe Systems Incorporated Lines: 26