|Robinson Model R44|
Although one of the most successful civilian helicopters since the Bell JetRanger, the R.22B was limited to only two people and Frank Robinson began designing a larger four-seater version which was introduced onto the market in 1993.
The R-44 Astro is proving as successful as the smaller R-22 Beta with both operators and private owners who are moving into more cost effective machinery which combines turbine performance with piston engine economy. During 1994 Robinson sold over 195 helicopters — 89 R-22s and 106 R-44s
The R-44 Astro is powered by a single 260bhp Lycoming O-540 FIB5 piston engine giving a cruise speed of 210km and a range of 640km plus.
P.Allen "The Helicopter", 1996
Having defined the market for a light two-seat helicopter, the Robinson Helicopter Company decided to take the next logical step forward. In the summer of 1986 it announced it was developing a four-seat helicopter based on the R22 design. Designated R44, this new aircraft closely resembled its smaller sibling and retained the two-blade main rotor layout. The prototype (N44RH) first flew on 31 March 1990 and two aircraft were engaged on the flight test programme. A third aircraft flew in March 1992, and the type was certificated later that year. A new production site at Santa Maria, California, has been prepared for the R44, though the first 25 aircraft will be built at Torrance alongside the R22. This first batch of helicopters is only being released to customers in the south-western USA, in case they need to be recalled for modifications. Export deliveries will commence in 1993. So far the R44 has displayed all the qualities necessary to rival the R22. In March 1992 36 deposits of $15,000 were taken on the first day of sales alone. By mid-1993 orders were approaching 150. Fuel consumption is less than 68 litres per hour, and the patented Robinson tri-hinge rotor is fitted with a rotor brake. Flyaway cost of a fully equipped R44 is listed at $235,000.
D.Donald "The Complete Encyclopedia of World Aircraft", 1997
TYPE: Four-seat helicopter.
PROGRAMME: Development began 1986; first flight (N44RH) 31 March 1990; first flight of third R44 March 1992; marketing began 22 March 1992, certification completed 10 December 1992. In August 1997 an R44 became first piston helicopter flown around the world, in June 2002 an R44 Raven (G-NUDE) became the first piston-engined helicopter to land at the North Pole. Japanese certification achieved 18 November 2002.
R44 Astro: Initial version; no longer produced.
R44 Raven I: Basic version, introduced in April 2000 to replace Astro; features 194kW Textron Lycoming O-540 engine derated to 168kW at T-O, 153kW continuous; hydraulic control system standard; plus elastomeric tail rotor bearings and adjustable pedals for pilot.
R44 Raven II: Upgraded version introduced in June 2002. FAA certification 10 October 2002; first deliveries November 2002. Features a Textron Lycoming IO-540 engine, 28V 70A electrical system, increased lifting area on main rotor blades, and aerodynamic tip caps on main and tail rotor blades. Total of 124 ordered and 40 delivered by February 2003, including two ENG variants. As described.
R44 Clipper I and Clipper II: Float-equipped versions, initially certified (as R44 Clipper) 17 July 1996. Both versions available with twin utility floats; pop-out floats available only on R44 Clipper II. Total of 141 Clippers sold by 1 June 2001.
R44 Police Helicopter: Specially modified Raven II for law enforcement, with Inframetrics 445G Mk II IR sensor, TV camera and x7 zoom lens mounted in gyrostabilised nose turret; LCD video monitor; Spectrolab SX-5E 15 to 20 million candlepower searchlight; FM radio package; bubble door windows; Bendix/King KFM 985 dual-band transceiver, KY 196A VHF, II Morrow Apollo SL-60 standby comms, KT 76C transponder, 28V electrical system and extended landing gear struts. Empty weight, equipped, approx 715kg. Certified July 1997; first customer El Monte Police Agency of Los Angeles. Recent customers include the Estonian Air Force, which ordered two in February 2002 for delivery commencing May 2002, and China's Zheng Zhou Public Security Bureau, which took delivery of one in June 2002 following its appearance at the China Expo 2002 exhibition.
R44 Newscopter: Digital electronic news gathering (ENG) version of Raven II intended for media companies and fitted with Ikegami HL-59WNA digital camera with x21 lens and 360° continuous rotation with five-axis gyro stabilisation; and microwave transmitter; four video monitors, two micro cameras, KY 196A VHF, KT 76C transponder (Mode C), GPS, two FM radios and bubble window in port door. Deliveries began January 1998; 29 sold by 1 June 2002. First digital ENG Raven II delivered on 9 February 2003 to Sky Helicopters of Garland, Texas, and was the 30th ENG Newscopter delivered.
R44 IFR: Equipped for IFR helicopter training IFR package adds US$27,200 to standard cost. 18 Sold by 1 June 2001.
CUSTOMERS: Total of 1,125 delivered by 1 Septemeber 2001. Deliveries totalled 150 in 1999, 264 in 2000, and 194 in 2001. Total of 57 delivered in first three months of 2003. 1,000th delivery took place in February 2001.
COSTS: Raven I US$307,000, Raven II US$343,280; Clipper I with utility floats US$323,000, Clipper II with utility floats US$356,000. Clipper II with pop-out floats US$363,000, R44 Police Helicopter US$509,000, R44 Newscopter US$549,000 (all 2003). Direct operating cost US$43.30 per hour; total (500 hours annually) US$131.87 per hour (both 2003).
DESIGN FEATURES: New design, incorporating general configuration (but larger cabin) and some proven concepts of R22; designed to requirements of FAR Pt 27; features for comfort and safety include electronic throttle governor to reduce pilot workload by controlling rotor and engine rpm during normal operations, rotor brake, advanced warning devices, automatic clutch engagement to simplify and reduce start-up procedure and reduce chance of overspeed, T-bar pistol grip cyclic control, and crashworthy features including energy-absorbing landing gear and lap/shoulder strap restraints designed for high forward g loads. High reliability and low maintenance; patented rotor design with tri-hinge (see R22); low noise levels.
FLYING CONTROLS: Conventional, with Robinson central cyclic stick; rpm governor; rotor brake standard; left-hand collective lever and pedals removable.
LANDING GEAR: Fixed skids; or, on R44 Clipper I, twin utility floats; or, on R44 Clipper II, twin utility floats, or pop-out helium floats, which inflate in 2 seconds.
POWER PLANT: One 224kW Textron Lycoming IO-540 AE1A5 flat-six engine, derated to 183kW for 5 minutes, 153kW maximum continuous. Standard fuel capacity 116 litres in tank on port side; optional 69 litres in starboard tank. No transmission limit; transmission TBO 2,200 hours or 12 years.
ACCOMMODATION: Four persons seated 2 + 2. Baggage stowage beneath each seat. Dual controls. Cabin heated and ventilated. Tinted windscreen and door windows.
AVIONICS: Comms; Bendix/King KY 196A VHF radio; KT 76C transponder with Mode C altitude encoder; and NAT AA 80 intercom system with floor and hand switches. Options include Garmin 420 GPS/COM; Garmin 430 GPS/COM/VOR/LOC/GS with 106A CDI; Pointer 3000-10 or 4000-10 (Canadian spec) ELT; NAT AA 12 intercom controller; and David Clark H10-13H or Bose Series X headsets.
Optional instruments include BFG (AIM) 1100 artificial horizon with/without slip indicator; BFG (AIM) 205-1A DG; turn co-ordinator; PAI-700 vertical compass (replaces standard compass); United Instruments IVSI (replaces standard VSI); LC-2 digital clock (replaces standard clock); and millibar altimeter.
EQUIPMENT: Standard equipment includes rotor brake; tinted windscreen and windows; belly hardpoint; dual landing lights; navigation, panel and map lights; anti-collision light; ground handling wheels; tow cart adapter, rotor blade tie-downs; and windscreen cover. Optional equipment includes three-cylinder engine priming system; RHC oil filter; observation bubble windows; cabin heater/ defogger; metallic base or trim exterior colours; and leather seats.
Jane's All the World's Aircraft, 2004-2005
Technical data for Robinson R.44
Crew: 1, passengers: 3, engine: 1 x Textron Lycoming O-540 pistone engine, rated at 194kW, main rotor diameter: 10.06m, height: 3.28m, take-off weight: 1088kg, empty weight: 635kg, cruising speed: 209km/h, ceiling: 4270m, range: 643km