flywheel! Great question! Please participate!

25 points per the four people that help explain this the best.

75 centimeter (diameter) flywheels don't make sense, right?  Why would you have such a thing?
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Well, why not?

From the sales pov, if you already have flywheels of different diameters (eg 5, 10, 20, 30 cm...), why not have one in a much larger size? Then the stores can boast in their advertisements that they have the most varieties of flywheels. In fact they can say that they have the biggest flywheel in... .

Even if there is no practical use for such a big flywheel, The store can use it as a window display, which would be very eye-catching.

It could also be used for the building of some huge clock towers which might need bigger flywheels.

Anyway, the word flywheel makes no sense in the first place: wheels roll, they don't fly.
All you ever wanted to know about flywheels

Would one so big be practical, probably not.  But then not everything that is made is practical, some things are just decorative.
andyalderSaggar maker's framemakerCommented:
>would one so big be practical, probably not. is much bigger than 75cm, I think the biggest flywheel is about 20' diameter.
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Nice pic Andy.....  And there's me getting stuck in the rut of just one or two applications.
andyalderSaggar maker's framemakerCommented:
Here's the smallest one I could find (it's a motor really but anything that spins and has mass behaves like a flywheel)

If we knew wat radomirth wanted his flywheel for we might be able to help more.
Andrew CroftsCommented:
Why have a 75cm flywheel when there are *so* many other sizes to choose from !
Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
The fourth one down under Benz mentions a flywheel of exactly 75cm - seems the engine can run slower.

radomirthegreatAuthor Commented:
I just want to have a nice, little forum about a 75cm flywheel, Andy.

Thank you very much for all of your participation.  Does anyone have anything else absolutely, purely brilliant to say about flywheels?
andyalderSaggar maker's framemakerCommented:
The Earth-Moon system obeys the same laws of angular momentum as flywheels do, which is why the Earth spins on an axis that's always close to being orthogonal to the ecliptic plane. Without the moon being there it could easily flip so what we call the north pole would then point towards the sun and we would all die. Does that help?
radomirthegreatAuthor Commented:
Very much so.  How, again, does that relate to a flywheel?
Mercury has no moon, yet it doesn't easily flip so  the north pole would then point towards the sun
radomirthegreatAuthor Commented:
Yes.  That's a nice point.  How can you relate moons to flywheels?  I'm sincerely interested.  Find a relationship, please.
smells like a homework assignment
radomirthegreatAuthor Commented:
nothing particularly 'wrong' about at flywheel with a diameter of .75meters  (or even 75 meters:-).
Some of the early steam engines had pretty huge flywhels.

However big is unhandy and also have a lot of mass which you do not want in fx an automobile that need to accellerate and brake all the time. So we prefer to make them as small as possible, letting small flywheels spin faster to store the same amount of energy. The limit to that is material strength. A flywheel ripping itself apart with centripetal force is not very desirable.

regards JakobA

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radomirthegreatAuthor Commented:
Very interesting.  I've never thought about it in that way.  What about monster trucks?
If you momentarily connect a large heavy flywheel to the transmission of your car when you want to stop, the forward momentum of your car is converted to angular momentum of the flywheel.  This slows the car and you brake.

To pull away again, simply reconnect the flywheel the other way round and you accellerate without burning fuel.

Regenerative braking.

radomirthegreatAuthor Commented:
Thank you all very much.  This was a very interesting forum.
andyalderSaggar maker's framemakerCommented:

Why only at the very of the end does radomirthetwat say that the flywheel is for a motorcar engine?
radomirthegreatAuthor Commented:
I don't know.  I just wanted a flywheel discussion.  When you see another question that I posted in the miscallaneous area, please go nuts, unless other people have already participated and they mind getting e-mail notifications about nothing at all.
radomirthegreatAuthor Commented:
By the way, tell me something about monster trucks for 25 points.
radomirthegreatAuthor Commented:
**For 25 points, tell me something about monster truck clutches.**

Thank you,
Radomir Jordanovic
andyalder, "wobble", whether he means precession or nutation. is far from saying "it could easily flip so what we call the north pole would then point towards the sun".
Anyway, the moon and sun together cause more precession, and probably more nutation, than would the sun alone
>>**For 25 points, tell me something about monster truck clutches.**

Monster truck clutches are used to assist gear changes in monster trucks.
radomirthegreatAuthor Commented:
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