Talk:Flywheel

message: What is the flywheel made out of will you please tell me Because I have to do a report on it. So if you can send more information on the flywheel.
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There is no one "flywheel material". A flywheel's inertia depends on both the mass of the matrial used to create it, and the distance of each piece of material from the centre of rotation. So, for say a backup power generation application (where the flywheel stores kinetic energy which can later on be used to generate electrical energy) a design using a heavy material with the mass concentrated far away from the centre is preferable. 
However, by moving the mass away from the centre, the tensile strength needed to hold the material in place (and stop the wheel from ripping itself apart) increases. Note that in the animated GIF currently on the page most of the mass is concentrated in the flat rim on the edge of the wheel. Additionally the wheel has most of the material in between the 'spokes' removed, which lightens the wheel by removing mass where it is least effective (i.e. closer in to the centre )
--202.159.206.45 09:58, 19 November 2005 (UTC)
thread_title:  Flywheel Material 

message: Can anyone explain The Flywheel Theory to me in its simplest terms? I am really trying to understand the basic idea behind it so that I can compare it to being a sales rep. Any explanations offered would be greatly appreciated Thanks.
:A flywheel requires some impetus to get it going, the same applies to a sales rep.Gregorydavid 00:13, 20 March 2007 (UTC)
thread_title:  Please Help! 

message: I cut this error from article. Gregorydavid 00:02, 20 March 2007 (UTC)
thread_title: Sandpit

message: I have removed the link to pitch in the following sentence:
"...A vehicle with a vertical-axis flywheel would experience a lateral momentum when passing the top of a hill or the bottom of a valley (roll momentum in response to a pitch change).."
This is to reduce links to disambiguation pages. Hopefully one of you wise people who know which pitch it is referring to can either let me know which it is, or correct the link to the appropriate pitch! =) Marc 09:20, 11 May 2007 (UTC)
thread_title: Disambig

message: The white flywheel image overlaps some of the text of the preceding paragraph for me.  If I weren't going to bed right now I'd fix it. 202.10.86.59 15:42, 12 June 2007 (UTC)
thread_title: Overlapping Image

message: If a flywheel is attached to a generator,the generator's torque is effected,especially at the start of torque,isn't it?  —Preceding unsigned comment added by 218.249.29.234 (talk) 07:23, 16 September 2008 (UTC)
thread_title:  Please help! 

message: I've cleaned up this section some, but I sense that the entire section belongs elsewhere (i.e., in a different article). Lambtron (talk) 19:19, 5 October 2011 (UTC)
replies: text: I agree. In case you're not aware there appears to be a group of Indian students who've been told to add stuff to WP and have been copy-pasting lots of stuff with little guidance. Much has already been reverted as copyvio (e.g. Band brake). DexDor (talk) 19:29, 5 October 2011 (UTC)
thread_title:  Rimmed flywheels 

message: I have blanked all the edits made by WP:IEP students on this page, as they all seem to be copied from textbooks. This is part of an ongoing effort to clean up the IEP edits. The students (
,,, for this page) have been notified. ManishEarthTalk • Stalk 04:39, 28 October 2011 (UTC)
thread_title:  Blanked all IEP edits 

message: It used to read "I = (1/2) m (rexternal^2 - rinternal^2)", I changed the - sign into a +.
Reasoning behind the - sign would have been that "whether you shave some material off the inside or the outside, the difference rexternal^2 - rinternal^2 decreases, so I decreases, and that's what actaully happens."
However, that reasoning looks wrong to me. First, the shaving would lower m, and second, if you set rexternal = r, rinternal = 0, you do get the solid result of I = (m/2) r^2, but if you set rexternal = rinternal = r, you get I = 0, not the thin-walled I = m r^2. The + sign would give the correct result.
This is only a semi-educated guess. Can anyone check the formulae please? - ¡Ouch! (hurt me / more pain) 08:57, 8 November 2011 (UTC)
replies: text: @One.Ouch.Zero is correct, it is a + and not a -, see http://hyperphysics.phy-astr.gsu.edu/hbase/ihoop.html. You can also calculate the integral if you need to be convinced ;) I corrected the formula accordingly. 212.126.165.68 (talk) 14:26, 2 February 2023 (UTC)
thread_title:  Thick-walled empty cylinder 

message: The table in the "Examples" section is misleading since it uses a theoretical maximum energy capacity, rather than the actual energy capacity of the devices which it references.  For instance, the actual energy capacity of the last flywheel is 3000kW-sec, or 3MJ (found here)  — Preceding unsigned comment added by 173.246.15.78 (talk) 01:31, 6 December 2011 (UTC)
thread_title:  Theoretical Energy vs. Manufacturer's Specs 

message: This article has been edited by a user who is known to have misused sources to unduly promote certain views (see WP:Jagged 85 cleanup). Examination of the sources used by this editor often reveals that the sources have been selectively interpreted or blatantly misrepresented, going beyond any reasonable interpretation of the authors' intent.
Please help by viewing the entry for this article shown at the page, and check the edits to ensure that any claims are valid, and that any references do in fact verify what is claimed. 
I searched the page history, and found 6 edits by Jagged 85 (for example, see this edits). Tobby72 (talk) 16:14, 19 January 2012 (UTC)
thread_title: Misuse of sources

message: This article also should speak of the dangers of flywheels. If the bearing seizes or the pedestal gives way, the rotor of an industrial-sized flywheel or motor most literally turns into a Juggernaut, that is godess Khali's unstoppable war chariot running amok. The rotor of an electric locomotive's motor-generator set gladly ruins the whole factory building, if it breaks free during full power test (did happen at Ganz-Mavag Hungary). Possibly worse outcome than a boiler explosion, if we compare with steam locomotives, but happens less frequently.
Allegedly, a carbon-in-vacuum flywheel proposed as an alternative for battery-based KERS for family sedans, couldn't withstand the designed 60k RPM and exploded at Volvo during tests and then the chassis looked like as if hit by an IED. 82.131.132.180 (talk) 21:00, 25 April 2015 (UTC)
replies: text: This sort of safety aspect is another reason for the use of vacuum. With a vacuum flywheel system it's possible to use contra-rotating flywheels mounted very close to each other, without windage problems. This cancels out their overall momentum, so that a catastrophic failure destroys itself in-place, rather than turning the housing into a spinning projectile. It also allows them to be fitted with brake surfaces. If there's a partial failure of the bearings, contact between them can dissipate energy as localised heat (destructively), rather than releasing it around the test cell as kinetic energy. Andy Dingley (talk) 21:19, 25 April 2015 (UTC)
thread_title:  Juggernaut. 

message: I have seen flywheels described as being incorporated into fitness machines like rowers (horizantal pulls) or for pulling down/back the 'ski-erg'. I am wondering if a section explaining fitness machines for cardio or strength/endurance for arms and such could be created. Not sure what references could help build it. Seems like a good alternative for people with leg injuries or movement restrictions. Ranze (talk) 23:53, 25 May 2015 (UTC)
thread_title: Fitness applications

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thread_title:  External links modified 

message: Can we think of more realistic flywheels, please? Darsie42 (talk) 10:16, 19 June 2019 (UTC)
thread_title:  1 g, 1.964 m radius flywheel? 

message: Hello all! 
This article has been chosen as this fortnight's effort for WP:Discord's #team-b-vital channel, a collaborative effort to bring Vital articles up to a B class if possible, similar to WP:Articles for Improvement. This effort will run for up to a fortnight, ending early if the article is felt to be at B-class or impossible to further improve. Articles are chosen by a quick vote among interested chatters, with the goal of working together on interesting Vital articles that need improving.
Thank you! Remagoxer (talk) 22:00, 13 May 2022 (UTC)
replies: text: Remagoxer, sure thing! CactiStaccingCrane (talk) 08:56, 14 May 2022 (UTC)
thread_title:  Team-B-Vital Improvement Drive