title: Weller UW-9 Sprint
text: # Weller UW-9 Sprint
  
  The Weller UW-9 Sprint is a German ultralight aircraft designed and produced by Weller Flugzeugbau of Bibersfeld. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.
  
  ## Design and development
  
  The UW-9 is intended as a nostalgic 1930s style design that would comply with the Fédération Aéronautique Internationale microlight rules. It features a strut-braced parasol wing, a two-seats-in-tandem open cockpit, fixed conventional landing gear and a single engine in tractor configuration.
  
  The aircraft fuselage is made from welded steel tubing, with bolted-together aluminum tubing spar ladder-construction wings, all covered in doped aircraft fabric. Its 9.8 m (32.2 ft) span wing has an area of 13.3 $m^2$ (143 sq ft) and a cut-out in the centre trailing edge for rear cockpit access. The wing is supported by "V"-struts and jury struts. The tailplane is also supported by "V"-struts. Standard engines available are the 70 hp (52 kW) Sauer UL 2100, the 75 hp (56 kW) Limbach L2000EA, the 100 hp (75 kW) Rotax 912ULS four-stroke powerplants, or the 85 hp (63 kW) Rotec R2800 radial engine. The Sprint is approved for aero-towing gliders and banner towing in Germany.
  
  ## Specifications (version)
  
  Data from Bayerl and Weller
  
  General characteristics
  
  * Crew: one
  * Capacity: one passenger
  * Length: 5.7 m (18 ft 8 in)
  * Wingspan: 9.8 m (32 ft 2 in)
  * Height: 2.5 m (8 ft 2 in)
  * Wing area: 13.3 $m^2$ (143 sq ft)
  * Empty weight: 290 kg (639 lb)
  * Gross weight: 472.5 kg (1,042 lb)
  * Fuel capacity: 87 litres (19 imp gal; 23 US gal)
  * Powerplant: 1 × Sauer UL2100 four cylinder, air-cooled, four stroke aircraft engine, 52 kW (70 hp)
  * Propellers: 3-bladed composite
  
  Performance
  
  * Maximum speed: 170 km/h (110 mph, 92 kn)
  * Cruise speed: 130 km/h (81 mph, 70 kn)
  * Stall speed: 62 km/h (39 mph, 33 kn)
  * Range: 630 km (390 mi, 340 nmi)
  * Endurance: 7 hours
  * Maximum glide ratio: 10.5:1
  * Rate of climb: 6.8 m/s (1,340 ft/min)
  * Wing loading: 35.5 $kg/m^2$ (7.3 lb/sq ft)
  