Vertipedia - Bristol 171 Mk.2

First prototype for the 171 type series with a British engine designed for helicopter use.

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:

Weights
Max Gross Weight (ground):	2,200 kg	4,850 lb
Max Gross Weight (airborne):
Max Take-off Weight:	2,200 kg	4,850 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:

Range and Endurance
Max Range:
Max Endurance:

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

Powerplant
Number of engines:	1
Designation:	Alvis Leonides LE.21HMV 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:

Pitch control via 3-armed spider

Main Rotor Characteristics
Diameter:	14.45 m	47.41 ft
RPM:
Direction of Rotation:	Clockwise
Hub Type:	Fully articulated

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

Main Rotor Derived Characteristics
Disc Area:	163.99 m²	1765.3 ft²
Disc Loading:	13.42 kg/m²	2.748 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 Reciprocating
Max Level Flight Speed:
Max Range:
Max Endurance:

Main Rotor Diameter:	14.45 m	47.41 ft
Max Gross Weight (ground):	2,200 kg	4,850 lb
Useful Load (calculated):