Vertipedia - Bristol Sycamore HR.11

Communications version for the British Army version based on the 171 Mk.3.

Source: ”Helicopters & Autogyros of the World”, Paul Lambermont with Anthony Pirie, Second edition 1970, Cassell & Company Ltd, SBN 304 93390 2

Overview

Data on design, manufacture and status

Design authority: Bristol Aeroplane Company, Helicopter Division

Primary manufacturer: Bristol Aeroplane Company, Helicopter Division

Parent type: Bristol Type 171 Sycamore

Aircraft status: No longer flying

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: Wheels (non-retractable)

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:
Overall Length:
Overall Width:

Airframe Dimensions
Airframe Length:
Airframe Width:
Airframe Height:

Landing Gear Dimensions
Landing Gear Base:
Landing Gear Track:

Cabin Dimensions
Cabin Internal Height:
Cabin Internal Length:
Cabin Internal Width:

Ceiling stated as absolute ceiling

Weights
Max Gross Weight (ground):	2,359 kg	5,201 lb
Max Gross Weight (airborne):	1,647 kg	3,631 lb
Max Take-off Weight:	2,359 kg	5,201 lb
Empty Weight:
Useful Load:
Empty Weight Fraction:

Climb Performance
Max Rate of Climb:

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:
Never Exceed Speed:
Service Ceiling:	5,791 m	18,999 ft

Range and Endurance
Max Range:	521 km	281 nm
Max Endurance:

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

Powerplant
Number of engines:	1

Normal Ratings
Max continuous:
Take-off / rated:
Intermediate:
Maximum:

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

Main Rotor Characteristics
Diameter:	14.07 m	46.16 ft
RPM:
Direction of Rotation:	Clockwise
Hub Type:	Fully articulated

Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:
Blade Tip Geometry:	Conventional , with mass balance at tip
Blade Twist:
Number of Blades:	3

Main Rotor Derived Characteristics
Disc Area:	155.48 m²	1673.6 ft²
Disc Loading:	15.17 kg/m²	3.108 lb/ft²
Solidity:

Main Rotor Blade Derived Characteristics
Blade area per blade:
Tip Speed:

Tail Rotor Characteristics
Diameter:
Configuration:	Unknown
Direction of Rotation:	Unknown
RPM:

Tail Rotor Blade Characteristics
Number of Blades:
Blade Construction:	N/A
Blade Chord:
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:
Solidity:

Tail Rotor Blade Derived Characteristics
Tip Speed:
Blade Area (per blade):

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Number of engines:	1 Unknown
Max Level Flight Speed:
Max Range:	521 km	281 nm
Max Endurance:

Main Rotor Diameter:	14.07 m	46.16 ft
Max Gross Weight (ground):	2,359 kg	5,201 lb
Useful Load (calculated):