Zarrina is a modified Cassutt IIIM. Her civil registration number is N21DK. The airplane was custom built from plans in 1994 by Daniel Krusienski. N21DK was placed in storage for most of the 1990's before being purchased by Formula 1 race pilot Tim Bovee. Tim entered 21DK in the 2002 National Championship Air Races in Reno, Nevada. She was raced as #88, "Crazy Eights" and flown by Ib Hansen. The airplane finished seventh in the Bronze class. After the 2002 races Tim sold 21DK to Smokey Young, owner of Zarrina Air Racing, LLC. Smokey flew 21DK extensively through the winter of 2002-2003 and took the airplane to the 2003 Pylon Racing Seminar at Stead Field. Armed with this experience the airplane was modified with improved gear and horizontal stabilizer fairings and adjustments were made to the engine's offset. The airplane was renamed "Zarrina" and given race #77. "Zarrina" was entered in the 2003 National Championship Air Races where she qualified in the Bronze at 184.249 MPH. She went on, with Smokey Young at the controls to place third in both Bronze Heat Races and the Bronze Final.

Although many are built purely for sport, the Cassutt IIIM was designed specifically for pylon air racing and is the most prolific aircraft type seen in Formula 1. The aircraft is built from plans. The fuselage is made from welded 4130 Chromoly steel tubing in a truss type structure. The fuselage is then covered with fabric and fiberglass. The wing of the aircraft is made of wood. Wing ribs are truss type on a laminated spruce main spar. The wing is covered with plywood. The engine specified for Formula 1 is a Continental O-200. Rules require that the engines remain predominantly stock however balancing and polishing of parts allows these engines to reach race RPM's of over 4000. In her current configuration "Zarrina" achieves 3000 RPM static and over 3500 RPM on the race course. This was with a 54x66 wooden fixed pitch propellor. G&N Aircraft of Merriville, IN has worked to boost our RPM to the 4000+ range. In addition, our wooden prop has been replaced with one made from composite materials. Pushing these engines yields phenomanal performance. Cassutts in the Gold Class at Reno achieve course speeds of over 250 MPH.

Since the end of the 2003 races #77 has gone into an extensive rebuild and modification program. The steel gear has been replaced by aluminum gear manfuctured by Grove Aircraft. Also, a bubble canopy built by Todd's Custom Canopies has been installed. The entire cowling has been replaced and an 8 inch prop extension from Sabre Mfg has been added. Finally, the wing has been "cleaned up" extensively with new foan and glass tips and a smooth polyurethane finish. Race 77 will return to Reno in the spring of 2006 for the Pylon Racing Seminar and then in September for the National Championship Air Races. Race 77 is currently hangered at the Chino Airport in Chino, California.