Lancair IV-P N427JB (sn 150) Photo taken July 08. 2006 Arlington Northwest EAA Fly-In July 2006 Arlington, WA USA (KAWO Photo © Marcel Siegenthaler

The Lancair IV and IV-P are a family of four-seat low-wing retractable-gear composite monoplanes powered by a 550 cubic inch Continental turbo-normalised piston engine.

Development

The Lancair IV and IV-P were designed by Lancair around the Continental TSIO-550 - a twin turbocharged engine that is capable of developing 350 hp (261 kW) at sea level and capable of operating altitudes as high as 29,000 feet.

By the fall of 2007 100 Lancair IVs and 225 IV-Ps had been completed and were flying.

Variants

• Lancair IV
  Unpressurized four seat kit-plane, powered by a 350 hp (261 kW) Continental TSIO-550 engine
• Lancair IV-P
  Pressurized four seat kit-plane, powered by a 350 hp (261 kW) Continental TSIO-550 engine
• Lancair Propjet
  Pressurized four seat kit-plane, powered by a Walter turbine or Pratt & Whitney Canada PT6 turboprop that can achieve cruise speeds in excess of 300 knots (556 km/h) at altitudes up to 30,000 feet (9,140 m).

Accidents

As of March 2010, the NTSB Aviation Accident Database records 19 crashes involving 17 fatalities across all IV variants.

Specifications (Lancair IV-P)

General characteristics
Crew: 1
Capacity: 3 passengers
Length: 25 ft (7.62 m)
Wingspan: 35.5 ft (10.8 m)
Height: ()
Wing area: 98 ft² (9.1 m²)
Airfoil: root: McWilliams RXM5-217, tip: NACA 64-212
Empty weight: 2,200 lb (998 kg)
Loaded weight: 3,550 lb (1,610 kg)
Max takeoff weight: 3,550 lb (1,610 kg)
Powerplant: 1× Continental TSIO-550 3 or 4 blade options, 350 hp (260 kW)

Performance
Cruise speed: 330 mph (@ 29,000 ft) (534 km/h, 286 knots (@ 29,000 ft))
Stall speed: 73 mph (118 km/h, 63 knots)
Range: 1,550 miles (2511 km)
Rate of climb: 1,500 ft/min (7.62 m/s)
Wing loading: 36.2 lb/ft² (177 kg/m²)
Power/mass: 10.14 lb/hp (0.16 kW/kg)