The Phi Alpha 10 was primarly designed to be a test platform for various engines and accessories. The following video is of the Centrifugal Supercharger (unpainted brown housing behind the seat) being tested.
The CentrifugalSupercharger Manual is free with the purchase of the plans. In it are details on how to mount, what tricks to use when supercharging engines.
These are some related articles on Super Charging and are well worth the read:
|Basic Principles in SuperCharging: A Go Kart With More Bolt On Power|
|Getting More Umph Out of Your SuperCharger Set Up|