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Hiller UH-12 / H-23/OH-23 Raven

Hiller H 23 C © Karsten Palt
Photo ©: Karsten Palt

UH-12 / H-23/OH-23 Raven

Light Observation Helicopter

The Hiller UH-12 is a single-engine three-seat light utility helicopter produced by the US-American manufacturer Hiller Helicopters Inc. initially designated Hiller 360. The UH-12 in service with the US-Army was designated H-23 Raven, redesignated OH-23 Raven (Observation Helicopter) in 1962. Later civil variants were named the Hiller 12.
Propulsion1 Piston Engine
Engine ModelLycoming VO-540-1B
Engine Power235 kW315 hp
Speed154 km/h83 kts
  96 mph
Service Ceiling4.023 m13.200 ft
Range330 km178 NM
205 mi.
Empty Weight807 kg1.779 lbs
max. Takeoff Weight1.270 kg2.800 lbs
Rotor Blades (main/tail)2/22/2
Main Rotor Diameter10,80 m35,4 ft
Tail Rotor Diameter1,68 m5,5 ft
Wing Area91,6 m²986 ft²
Length8,53 m28,0 ft
Height2,98 m9,8 ft
First Flight1948
Production Statusout of production
Production Range1949-1965
Total Productionca. 2000
Data for (Version)Hiller H-23D Raven
VariantsH-23A (UH-12A), H-23B / OH-23B, H-23C / OH-23C (UH-12C), H-23D / OH-23D (UH-12D), UH-12E, UH-12E3, H-23F / OH-23F (UH-12E-4), H-23G, HTE-1 (UH-12B), HTE-2 (H-23B), Hiller HT Mk 1 (
The UH-12 was produced in several different variant with two, three or four seats.

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