CEI Free Spirit Mk II

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Free Spirit Mk II
Role Homebuilt aircraft
National origin United States
Manufacturer CEI
Designer Richard Cabrinha
Introduction 1995
Status Prototypes only completed
Number built Two
Unit cost
US$24,950 (kit, 1998)

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.[1][2]

Design and development[edit]

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.[1]

The aircraft is made from lightweight pre-molded composites. Its 30.30 ft (9.2 m) span wing employs a NASA NLF(1)-0215F natural laminar flow airfoil, mounts flaps and has a very small wing area of 86.00 sq ft (7.990 m2), giving a high wing loading of 25.0 lb/sq ft (122 kg/m2). The cabin width is 44.5 in (113 cm). The acceptable power range is 150 to 220 hp (112 to 164 kW) and the standard engine used is the 210 hp (157 kW) Lycoming IO-360 powerplant.[1][3]

The Free Spirit Mk II has a typical empty weight of 1,250 lb (570 kg) and a gross weight of 2,150 lb (980 kg), giving a useful load of 900 lb (410 kg). With full fuel of 52 U.S. gallons (200 L; 43 imp gal) the payload for crew, passengers and baggage is 588 lb (267 kg).[1]

Operational history[edit]

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.[1][2]

Specifications (Free Spirit Mk II)[edit]

Data from AeroCrafter and The Incomplete Guide to Airfoil Usage[1][3]

General characteristics


  • Maximum speed: 300 mph (483 km/h; 261 kn)
  • Cruise speed: 240 mph (386 km/h; 209 kn)
  • Stall speed: 52 mph (84 km/h; 45 kn) flaps and landing gear down
  • Range: 1,200 mi (1,043 nmi; 1,931 km)
  • Service ceiling: 24,000 ft (7,300 m)
  • Rate of climb: 1,600 ft/min (8.1 m/s)
  • Wing loading: 25.0 lb/sq ft (122 kg/m2)


  1. ^ a b c d e f Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, Fifth Edition, page 131. BAI Communications, 15 July 1998. ISBN 0-9636409-4-1
  2. ^ a b Federal Aviation Administration (21 December 2013). "Make / Model Inquiry Results". Retrieved 21 December 2013. 
  3. ^ a b Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". Retrieved 21 December 2013. 

External links[edit]