Vertipedia - Robinson R44 Raven II

Overview

Data on design, manufacture and status

Design authority: Robinson Helicopter Company

Primary manufacturer: Robinson Helicopter Company

Parent type: Robinson R44

Aircraft status: Operational

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 1 Single main rotor

Dedicated control device: 1 Tail rotor

Crew required: 1 in Side-by-side arrangement

Landing gear: Skids

Key Characteristics

Data on key physical features

Aircraft Details

Data on aircraft configuration, weights, flight performance and equipment

Layout and Dimensions

Weights and Performance

Engine Details

Primary Lift Device

Primary Control Device

Overall Dimensions
Overall Height:	3.28 m	10.8 ft
Overall Length:	11.66 m	38.3 ft
Overall Width:	10.06 m	33.0 ft

Airframe Dimensions
Airframe Length:	9.01 m	29.6 ft
Airframe Width:	2.29 m	7.5 ft
Airframe Height:	3.28 m	10.8 ft

Landing Gear Dimensions
Landing Gear Base:
Landing Gear Track:	2.18 m	7.2 ft

Cabin Dimensions
Cabin Internal Height:
Cabin Internal Length:
Cabin Internal Width:	1.28 m	4.2 ft

MTOW Cruise Speed: 202 kmh

Weights
Max Gross Weight (ground):	1,134 kg	2,500 lb
Max Gross Weight (airborne):
Max Take-off Weight:	1,134 kg	2,500 lb
Empty Weight:	683 kg	1,506 lb

Climb Performance
Max Rate of Climb:	5 m/s	1,000 fpm

Hover Performance
Hover Ceiling IGE:	2,728 m	8,950 ft
Hover Ceiling OGE:	2,286 m	7,500 ft

Limitations
Max Level Flight Speed:
Never Exceed Speed:	222 km/h	120 kts
Service Ceiling:	4,267 m	14,000 ft

Range and Endurance
Max Range:	550 km	297 nm
Max Endurance:

Provided powerplant data is for uninstalled, sea level, static operations.

Powerplant
Number of engines:	1
Designation:	Lycoming IO-540 reciprocating
Manufacturer:	Lycoming Engines

Normal Ratings
Max continuous:	153 kW	205 hp
Take-off / rated:	183 kW	245 hp
Intermediate:
Maximum:

OEI Ratings
OEI contingency:
OEI continuous:
OEI 30-second:
OEI intermediate:

RPM calculated from 705 FPS.

Main Rotor Characteristics
Diameter:	10.06 m	33.00 ft
RPM:	408.0 rpm	408.0 rpm
Direction of Rotation:	Counterclockwise
Hub Type:	Teetering hinge with blade coning hinges, rigid in plane

Main Rotor Blade Characteristics
Blade Construction:	All-metal, Honeycomb structure
Blade Chord:
Blade Tip Geometry:	Conventional
Blade Twist:	-0.070 rad	-4.000 deg
Number of Blades:	2

Main Rotor Derived Characteristics
Disc Area:	79.46 m²	855.3 ft²
Disc Loading:	14.27 kg/m²	2.923 lb/ft²
Solidity:

Main Rotor Blade Derived Characteristics
Blade area per blade:
Tip Speed:	214.88 m/s	705.0 fps

RPM calculated from 614 FPS.

Tail Rotor Characteristics
Diameter:	1.47 m	4.83 ft
Configuration:	Pusher
Direction of Rotation:	Top blade aft
RPM:	2426 rpm	2426 rpm

Tail Rotor Blade Characteristics
Number of Blades:	2
Blade Construction:	All-metal
Blade Chord:	0.130 m	0.43 ft
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:	1.70 m²	18.3 ft²
Solidity:	0.1120

Tail Rotor Blade Derived Characteristics
Tip Speed:	187.13 m/s	614.0 fps
Blade Area (per blade):	0.095 m²	1.03 ft²

References

References and sources used

RJAF Acquires Robinson R44 Fleet

Rotor & Wing staff
Rotor & Wing, 2014, Oct 17
Website

Robinson Brochure | R44 Raven II & Clipper II

Robinson Helicopter Company
Dec 2016 (page 2)
Other

Robinson R44 II Pilot's Operating Handbook

Robinson Helicopter Company
3 Oct 2002 (page 1-4)
Report or Technical Manual

Rotorcraft Forecast 2013

Forecast International
May 2013 (page Section C)
Report or Technical Manual

The House that Frank Built

Moorman, R.W.
May/June 2013 (page 23)
Periodical

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Resources related to the R44 Raven II, provided by public sources across the internet.

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Images

Overview

Attribution

Main rotor

Attribution

Number of engines:	1 Reciprocating
Max Level Flight Speed:
Max Range:	550 km	297 nm
Max Endurance:

Robinson R44 Raven II

Related milestones

Robinson R44 Raven II

Overview

Configuration

Key Characteristics

Aircraft Details

References

Related VFS Resources

Forum Proceedings

Vertiflite articles

Web files from vtol.org

Webpages from vtol.org

Images from the VFS Gallery

Related Public Resources

Publicly-funded resources provided by the US Government

Public resources provided by select scholarly and academic sources

Additional links

Images

Overview

Main rotor

Milestones related to the R44 Raven II

Main Rotor Diameter:	10.06 m	33.00 ft
Max Gross Weight (ground):	1,134 kg	2,500 lb