title: Arrow Coax Livella Uno
text: # Arrow Coax Livella Uno
  
  The Arrow Coax Livella Uno (transl. First Level) is a German helicopter under development by Arrow Coax Ultra Light Helicopter of Hornhausen and introduced at the AERO Friedrichshafen airshow in 2015. The aircraft is intended to be supplied as a kit for amateur construction.
  
  ## Design and development
  
  The Livella Uno was designed to comply with the US FAR 103 Ultralight Vehicles and the European 120 kg class ultralight aircraft rules. It features a dual coaxial main rotors, with an inverted V-tail, a single open-air pilot's seat without a windshield, tricycle landing gear and a 40 hp (30 kW) Wankel Aixro XH40 engine.
  
  The aircraft fuselage is made from tubing. Its two-bladed rotors have a diameter of 3.8 m (12.5 ft). The aircraft has a typical empty weight of 85 kg (187 lb) and a gross weight of 195 kg (430 lb), giving a useful load of 110 kg (243 lb).
  
  The aircraft mounts a Galaxy Rescue System ballistic parachute in the rotor mast. It also has a small electric motor to power the rotor system from a battery in the event of an engine failure, allowing five minutes of power to land, since the low inertia rotor blades may not support autorotation.
  
  ## Specifications (Livella Uno)
  
  Data from Tacke
  
  General characteristics
  
  * Crew: one
  * Empty weight: 85 kg (187 lb)
  * Gross weight: 195 kg (430 lb)
  * Powerplant: 1 × Aixro XH40 liquid-cooled, Wankel aircraft engine, 30 kW (40 hp)
  * Main rotor diameter: 2 × 3.8 m (12 ft 6 in)
  * Main rotor area: 23 $m^2$ (250 sq ft)
  
  Performance
  
  * Maximum speed: 110 km/h (68 mph, 59 kn)
  * Cruise speed: 90 km/h (56 mph, 49 kn)
  * Disk loading: 8.5 $kg/m^2$ (1.7 lb/sq ft)
  