Flywheel Material

[Dave Gantz]

Years ago, generally, different weight steel flywheels were used for launching a drag car. Aluminum flywheels were used for circle track cars, to accelerate quicker, not having to worry about the launch. (At least that's the way I always had heard it.)
Are aluminum flywheels used in drag racing these days? (Or before?) I see a lot of them for sale, and with the advent of adjustable clutches, I was wondering if maybe the combination of aluminum flywheel and adjustable clutch (base and centrifugal) has changed things.