RAF Coastal Command version.

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 configuration: Single main rotor

Dedicated control device: Tail rotor

Crew required: 1

Crew seating: Tandem

Landing gear: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

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:  

Weights and Performance

Data on aircraft weight and flight characteristics

Ceiling stated as absolute ceiling

Weights
Max Gross Weight (ground): 2,359 kg 5,201 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 2,359 kg 5,201 lb
Empty Weight: 1,647 kg 3,631 lb
Useful Load: 712 kg 1,570 lb
Empty Weight Fraction: 0.698
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:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Powerplant
Number of engines: 1
Designation: Alvis Leonides 73 reciprocating
Manufacturer: Alvis Car and Engineering Company Ltd
Normal Ratings
Max continuous:  
Take-off / rated: 410 kW 550 hp
Intermediate:  
Maximum:  
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

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:  

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Diameter:  
Configuration: Pusher
Direction of Rotation: Top blade fwd
RPM:  
Tail Rotor Blade Characteristics
Number of Blades: 3
Blade Construction:  
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area:  
Solidity:  
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

Related VFS Resources

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Related Public Resources

Resources related to the Sycamore HR.12, provided by public sources across the internet.

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