This may be the last Kasperwing produced by Cascade Ultralights.  ‘Window Wing’ is powered by a single carb Rotax 503.  This particular Kasperwing is beefed up with 2″ LE spars, custom sail and includes smaller, later B-Mod rudders, along with sturdy rear landing gear with shocks.  Steve Grossruck personally upgraded the rigging and added just a bit more dihedral to the wings.