The Siren Board

Excellent point.

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

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..

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

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.

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.

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.

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.

robert gift wrote: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.

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.

Plastic would look weak.