CEI Free Spirit Mk II

The CEI Free Spirit Mk II, also called the Cabrinha Free Spirit Mark II and the Cabrinha Model 423, is a three-seat American homebuilt aircraft that was designed by Richard Cabrinha and produced by CEI of Auburn, California, introduced at AirVenture in 1995. The aircraft was intended to be supplied as a kit for amateur construction, but only prototypes seem to have been completed.

Design and development
The design goals of the Free Spirit Mk II included long range, high speed and a high rate of climb. The aircraft features a cantilever low-wing, a two-seats-in-side-by-side configuration, plus a jump seat in an enclosed cockpit, retractable tricycle landing gear and a single engine in tractor configuration.

The aircraft is made from lightweight pre-molded composites. Its 30.30 ft span wing employs a NASA NLF(1)-0215F natural laminar flow airfoil, mounts flaps and has a very small wing area of 86.00 sqft, giving a high wing loading of 25.0 lb/sq ft (122 kg/m2). The cabin width is 44.5 in. The acceptable power range is 150 to 220 hp and the standard engine used is the 210 hp Lycoming IO-360 powerplant.

The Free Spirit Mk II has a typical empty weight of 1250 lb and a gross weight of 2150 lb, giving a useful load of 900 lb. With full fuel of 52 u.s.gal the payload for crew, passengers and baggage is 588 lb.

Operational history
In 1998 the company reported that two aircraft were flying, but by December 2013 only one example remained registered in the United States with the Federal Aviation Administration.