[oil pan 4]

I need an additional unloader valve because the mechanical one closes as soon as the mechanical pressure switch closes and sends power to the motor. I need the unloader to stay open until the compressor is up to full speed.

At some point I was going to buy a go-cart clutch for my gasoline air compressor to make cold starting a lot easier, but before I put it on the gasser I was going to put it on my electric air compressor, just to see what happens.

Any clutch or CVT would need to have a 5/8 keyed shaft.

I have also found a nother way to reduce start up in rush.
Some testing has shown unloaded motor starts on 4 pole versus 2 pole motors is reducing starting inrush between 30 and 40% on the 1/2 speed motor.
So I may just switch to 4 pole motors and sell off my 2 pole units.

The magnetic clutch idea may work on a 4 pole motor.
Because I know I can get smaller horsepower 4 pole motors with 7/8 inch shafts. That's important because 7/8 inch keyed shafts have a wide variety of magnetic belt clutches.
Where 5/8 keyed shafts have almost nothing available as far as magnetic belt clutches.