From what are rotors and stators made?

[Robert Gift]

Excellent point.

I also like the mass metals impose which cause the nice wind-up and long wind-down.

[AlarmRepair]

you dont want a lite rotor!! You want cast iron or heavy Aluminum..... Just paint it and it wont rust....
That's what's so classic about the 3, 5 , 7 and 10 horsepower Federals is their nice smooth and sometimes long wind down. the model 2's suck as the rotor is not heavy enough for a long coast..

[Robert Gift]

Yes. I agree with you.
Long wind-down is for some reason much more pleasing.

Also a not too quick wind-up.

If you paint a rotor and there is uneven thickness, can that be enough to cause uneven balance and balance or vibration problems?

Thank you,

Robert

[SirenMadness]

Spray-painting a rotor will not affect its balance, nor will it increase the width of the rotor by any unwanted amount. I don't think that people paint their rotors with a brush.

A rotor without vanes can, in practice, be made of any hard metal, as it is fairly small in size, nor does it experience any unwanted fatigue under high centrifugal force.

[AllSafe]

Rotors are usually made of aluminum, steel or iron. Sometimes they may use plastic or plastic-coated rotors. I wonder if there are any made of brass.

[Robert Gift]

I'd like brass or bronze, but that would be very expensive.

You need something with mass if you want good startup and wind-down.

Maybe some day someone will make lightweight plastic rotors and their
motors will be electronically controlled to mimic the enertia of heavy metal rotors.

[SirenMadness]

If there were brass rotors that have vanes, I'd imagine them to be fairly small, as brass is a fairly soft metal in usual cases. Brass tends to bend easy under high energy.

[Jim_Ferer]

I'd like brass or bronze, but that would be very expensive.

You need something with mass if you want good startup and wind-down.

Maybe some day someone will make lightweight plastic rotors and their
motors will be electronically controlled to mimic the enertia of heavy metal rotors.

Just one question -- why? This sounds like an appendix transplant.

[Robert Gift]

Your "Just one question."s are always excellent.

I'm merely reacting to others' ideas.
I can see a desire for cheap lightweight plastic rotors.
Easier to fabricate than anything metal.

Otherwise, don't change anything.

[SirenMadness]

Plastic would look weak.